Aalborg Universitet
Master?s dissertation in Medical Market Access for the education Medicine with Industrial Specialisation 31-05-2011 Cost-effectiveness of endoscopic versus open harvest of a short saphenous vein segment for coronary artery bypass graftingA post hoc health economic evaluation of a randomised controlled trial Department of Health Science and Technology, Aalborg University By Lars Oddershede Endoscopic vein harvesting2806065152402222516510441325730250-2342515731520441325604520-2356485578485 Open vein harvestingPrefaceThis manuscript was written by Lars Oddershede during the fourth semester of the Medical Market Access branch of the education Master of Science in Medicine with Industrial Specialization at the Department of Health Science and Technology, Aalborg University. When completed, the manuscript will be submitted to The Journal of Thoracic and Cardiovascular Surgery, European Journal of Cardio-Thoracic Surgery or Interactive CardioVascular and Thoracic Surgery.I wish to thank Barbara Brocki who helped me with numerous practical issues and my supervisors, Lars Ehlers and Jan Jesper Andreasen, who gave excellent theoretical advice throughout the semester. Project period: February 2011 – June 2011Project group: 11gr1023Attendees: Lars OddershedeSupervisors: Lars Ehlers and Jan Jesper AndreasenNumbers printed: 5Number of pages: 14Finished: June 1st 2011The content of this report is freely accessible, but publication (with reference) may only happen with accept from the author.__________________________________________________Lars Oddershede ADDIN Cost-effectiveness of endoscopic versus open harvest of a short saphenous vein segment for coronary artery bypass graftingA post hoc health economic evaluation of a randomised controlled trialAbstractBackgroundA short saphenous vein segment is commonly used as a conduit for coronary artery bypass grafting (CABG), and clinicians must decide whether to obtain it by performing a traditional open vein harvest (OVH) or by performing an endoscopic vein harvest (EVH). We conducted a post hoc cost-utility analysis (CUA), based on a published study and from the Danish healthcare system?s viewpoint, to investigate whether EVH is cost-effective when compared to OVH.MethodsThe economic analysis was performed using a 35 day follow-up period and in accordance with international guidelines. We constructed four cost-levels as the current literature is inconclusive as to which resource consumptions differ significantly between EVH and OVH. Outcomes were assessed by performing a quality of life conversion of patients? postoperative pain, satisfaction with cosmetic results and observational data on mobility. We performed bias corrected bootstrap analyses on 5,000 re-samples to calculate the incremental cost-effectiveness ratio (ICER) and to construct cost-effectiveness acceptability curves (CEACs). Results were tested against a willingness-to-pay (WTP) threshold of ? 30,000/quality adjusted life-years (QALY).ResultsWhen costs and outcomes within the first 35 days were compared, the ICER was ? 64,482/QALY but <1 % cost-effective at a WTP of ? 30,000/QALY. Adding costs of treatments of surgical wound infections of the leg, which were already initiated at 35 days postoperatively, the ICER dropped to ? 38,876/QALY, and EVH became approximately 2 % cost-effective at a WTP of ? 30,000/QALY. If mobility was excluded from the measurement of outcome, EVH was <1 % cost-effective at a WTP of ? 30,000/QALY. ConclusionWe conclude that, within the first five weeks postoperatively, EVH is not a cost-effective method for harvesting a short saphenous vein segment during CABG, when compared to OVH.Keywords: Cost-effectiveness analysis, cost-utility analysis, CABG, endoscopic procedures, endoscopic vein harvest, open vein harvest, traditional vein harvest. IntroductionAlthough advances are being made in the use of arterial conduits for coronary artery bypass graft (CABG) surgery, the saphenous vein remains the most commonly used PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5DYWR3YWxsYWRlcjwvQXV0aG9yPjxZZWFyPjIwMDk8L1ll
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ADDIN EN.CITE.DATA [1-3]. When compared to the traditional open vein harvest (OVH), the endoscopic vein harvest (EVH) has been preferred as the increased patient satisfaction and the short term reduction in leg wound morbidity are well documented PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BbGxlbjwvQXV0aG9yPjxZZWFyPjIwMDU8L1llYXI+PFJl
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ADDIN EN.CITE.DATA [1-11]. Despite a vast number of randomised controlled trials (RCTs), reviews and meta-analyses comparing OVH with EVH only one cost-effectiveness analysis has been performed, using observational data ADDIN EN.CITE <EndNote><Cite><Author>Rao</Author><Year>2008</Year><RecNum>2</RecNum><record><rec-number>2</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">2</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Rao, C.</author><author>Aziz, O.</author><author>Deeba, S.</author><author>Chow, A.</author><author>Jones, C.</author><author>Ni, Z.</author><author>Papastavrou, L.</author><author>Rahman, S.</author><author>Darzi, A.</author><author>Athanasiou, T.</author></authors></contributors><auth-address>Department of Biosurgery and Surgical Technology, Imperial College London, London, United Kingdom.</auth-address><titles><title>Is minimally invasive harvesting of the great saphenous vein for coronary artery bypass surgery a cost-effective technique?</title><secondary-title>J Thorac Cardiovasc Surg</secondary-title></titles><periodical><full-title>J Thorac Cardiovasc Surg</full-title></periodical><pages>809-15</pages><volume>135</volume><number>4</number><edition>2008/04/01</edition><keywords><keyword>Coronary Artery Bypass/*economics</keyword><keyword>Cost-Benefit Analysis</keyword><keyword>Humans</keyword><keyword>Monte Carlo Method</keyword><keyword>Quality of Life</keyword><keyword>Saphenous Vein/surgery/*transplantation</keyword><keyword>Surgical Procedures, Minimally Invasive/*economics</keyword><keyword>Tissue and Organ Harvesting/*economics</keyword></keywords><dates><year>2008</year><pub-dates><date>Apr</date></pub-dates></dates><isbn>1097-685X (Electronic)
0022-5223 (Linking)</isbn><accession-num>18374760</accession-num><urls><related-urls><url>(07)01657-1 [pii]
10.1016/j.jtcvs.2007.09.042</electronic-resource-num><language>eng</language></record></Cite></EndNote>[12]. Therefore, this study aims to evaluate the cost-utility of EVH compared to OVH for harvesting a short saphenous vein segment, by using patient-level data from a published RCT. This study is based upon the findings of a study by Andreasen et al who compared EVH to OVH in 132 non-consecutive patients, conducted in accordance with the CONSORT statement and with approval from the regional ethical committee PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BbmRyZWFzZW48L0F1dGhvcj48WWVhcj4yMDA4PC9ZZWFy
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ADDIN EN.CITE.DATA [5]. For a more thorough description of the study by Andreasen et al than the one given in the methods section, please read the original article. MethodsThis post hoc cost-utility analysis (CUA) was approved by The Danish Data Protection Agency (J.no. 2008-58-0028). The analysis was constructed from the Danish healthcare system?s viewpoint and based on a study by Andreasen et al which was performed between April 2004 and June 2007 at Aalborg Hospital, Denmark. The 132 patients enrolled in the study were followed to examine whether leg wound morbidity was reduced after EVH compared to OVH until the mandatory follow-up 30 days postoperatively. However, the median time from the surgery to the “day 30 follow-up” was 35 days (range: 21-49days) this study therefore refers to the follow-up as “day 35” and will use all the information available until this point for the base case analysis. The preoperative baseline characteristics for the two groups are shown in Table 1 and as seen, no significant differences were found between the two groups. The study was conducted in accordance with international Table 1Preoperative baseline demographic and clinical characteristicsVariableEVH (n=66)OVH (n=63)P-valueAge (year), mean ± SD65±1065±80.94Male, n (%)59 (89)52 (83)0.26Obesity (BMI>30 kg/m?), n (%)13 (20)17 (27)0.33Diabetes mellitus, n (%)7 (11)9 (14)0.53Logistic EuroSCORE, mean ± SD 3.5±3.43.5±3.00.89Smokers, n (%)9 (14)16 (25)0.09Hypercholesterolemia, n (%)49 (74)48 (76)0.80History of intermittent claudication, n (%)2 (3)3 (5)0.61Hemoglobin (mmol/l), mean ± SD8.8±0.78.7±0.80.48Creatinine (μmol/l), mean ± SD92±3297±640.54Albumin (g/l), mean ± SD44±3.843±4.00.70Preoperative acetylsalicylic acid, n (%)44 (67)33 (52)0.10Preoperative clopidogrel, n (%)9 (14)10 (16)0.72Preoperative steroid, n (%)2 (3)1 (2)0.59BMI, Body Mass Index; EuroSCORE, European system for cardiac operative risk evaluation; diabetes mellitus = treatment with either insulin or oral agents; smoking = active at admission; preoperative acetylsalicylic acid and preoperative clopidogrel = intake of within 7 days prior to surgeryguidelines and based on best available evidence. ADDIN EN.CITE <EndNote><Cite><Author>Drummond</Author><Year>2005</Year><RecNum>6</RecNum><record><rec-number>6</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">6</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Drummond, Michael F</author><author>Sculpher, Mark J</author><author>Torrance, George W</author><author>O?Brien, Bernie J</author><author>Stoddart, Greg L</author></authors></contributors><titles><title>Methods for the Economic Evaluation of Health Care Programmes</title></titles><edition>3.</edition><section>379</section><dates><year>2005</year></dates><publisher>Oxford University Press</publisher><isbn>978-019-852944-6 (Hbk)</isbn><urls></urls><language>English</language></record></Cite></EndNote>[13] Resource consumption and costsWith regards to the estimation of costs, all current meta-analysis, systematic review and literature checks have found that mean length of hospital stay (LOS) is decreased with the use of EVH, and all found that mean operation time is increased by using EVH, however not all found the difference to be significant PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BbGxlbjwvQXV0aG9yPjxZZWFyPjIwMDU8L1llYXI+PFJl
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ADDIN EN.CITE.DATA [2-4, 6, 9, 10]. Because LOS and duration of surgery are two costs which carry great importance for the analysis, we therefore constructed 4 cost-scenarios where costs were added in layers, as it is somewhat uncertain whether the consumption of resources from these two factors definitely can be contributed to the choice of vein harvest method. The corresponding analyses of the incremental cost-effectiveness ratios (ICERs) were denominated ICER 1 & 5 for the first cost-level, ICER 2 & 6 for the second, ICER 3 & 7 for the third and ICER 4 & 8 for the fourth, as shown in Table 3. For the first cost-level, ICER 1 & 5, we excluded both the LOS and the duration of surgery. In the second cost-level, ICER 2 & 6, we added LOS to the cost analysis. This was chosen because 4 studies concluded that LOS was significantly reduced when minimal invasive vein harvest (MIVH) is used instead of OVH PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BbGxlbjwvQXV0aG9yPjxZZWFyPjIwMDU8L1llYXI+PFJl
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ADDIN EN.CITE.DATA [2, 4, 6, 10], and only one recent study by Markar et al did not find the reduction to be significant PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NYXJrYXI8L0F1dGhvcj48WWVhcj4yMDEwPC9ZZWFyPjxS
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ADDIN EN.CITE PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NYXJrYXI8L0F1dGhvcj48WWVhcj4yMDEwPC9ZZWFyPjxS
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ADDIN EN.CITE.DATA [3]. If patients? initial admission extended beyond 35 days, the remaining part for the admission was censored and for this analysis 5 patients had their initial admission censored. 3 out of the 5 patients who had their admissions censored beyond day 35 later died during their initial admission from non-cardiac or vein harvest related conditions. The censoring was performed for two reasons. Firstly, the extended initial admission did not have anything to do with the leg wounds. Secondly, it was done to give an intentional conservative estimate on costs resulting from admission in the OVH group. When admissions beyond 35 days were censored, the mean difference between EVH and OVH was -1.01 (95 % CI: -3.44 to 1.43), which corresponds to others findings PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BdGhhbmFzaW91PC9BdXRob3I+PFllYXI+MjAwNDwvWWVh
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ADDIN EN.CITE.DATA [2, 6], and if we did not censor admissions beyond 35 days the mean difference would have been -2.83 (95 % CI: -7.01 to 1.35), potentially biasing results toward EVH. Table 2Duration of surgery explained by: Variableβ (95 % CI)SEP-valueEVH (dummy)5.57 (-15.19 to 26.32)10.490.596No. of anastomoses33.69 (20.89 to 46.48)6.46<0.001Male (dummy)1.56 (-28.73 to 31.85)15.300.919Euroscore-1.51 (-5.97 to 2.94)2.250.503CABGECC (dummy)10.50 (-14.75 to 35.76)12.760.412Constant111.62 (60.33 to 162.91)25.91<0.001Number of observations 129; R-squared 0.2447; P < 0.0001 β, Coefficient. SE, Standard Error. ECC, extracorporeal circulation. To the third cost-level, ICER 3 & 7, costs from the duration of surgery were added as results regarding this were more heterogenic than the ones on LOS. A study by Cheng et al concluded that total time in surgery was significantly increased when using EVH ADDIN EN.CITE <EndNote><Cite><Author>Cheng</Author><Year>2005</Year><RecNum>16</RecNum><record><rec-number>16</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">16</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Cheng, Davy</author><author>Allen, Keith</author><author>Cohn, William</author><author>Connolly, Mark</author><author>Edgerton, James</author><author>Falk, Volkmar</author><author>Martin, Janet</author><author>Ohtsuka, Toshiya</author><author>Vitali, Richard</author></authors></contributors><titles><title>Endoscopic Vascular Harvest in Coronary Artery Bypass Grafting Surgery: A Meta-Analysis of Randomized Trials and Controlled Trials</title><secondary-title>Innovations:Technology and Techniques in Cardiothoracic and Vascular Surgery</secondary-title></titles><periodical><full-title>Innovations:Technology and Techniques in Cardiothoracic and Vascular Surgery</full-title></periodical><pages>61-74 10.1097/01.gim.0000196316.48694.41</pages><volume>1</volume><number>2</number><keywords><keyword>meta-analysis</keyword><keyword>endoscopic vascular harvest</keyword><keyword>coronary artery bypass surgery</keyword><keyword>01243895-200500120-00003</keyword></keywords><dates><year>2005</year></dates><isbn>1556-9845</isbn><urls><related-urls><url>;[2]. In a study by Allen et al the significance of the result depended on whether only RCT?s were analysed or if nonrandomised data was included ADDIN EN.CITE <EndNote><Cite><Author>Allen</Author><Year>2005</Year><RecNum>54</RecNum><record><rec-number>54</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">54</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Allen, Keith</author><author>Cheng, Davy</author><author>Cohn, William</author><author>Connolly, Mark</author><author>Edgerton, James</author><author>Falk, Volkmar </author><author>Martin, Janet </author><author>Ohtsuka, Toshiya </author><author>Vitali, Richard </author></authors></contributors><titles><title>Endoscopic Vascular Harvest in Coronary Artery Bypass Grafting Surgery: A Consensus Statement of the International Society of Minimally Invasive Cardiothoracic Surgery (ISMICS) 2005. </title><secondary-title>Innovations:Technology and Techniques in Cardiothoracic and Vascular Surgery</secondary-title></titles><periodical><full-title>Innovations:Technology and Techniques in Cardiothoracic and Vascular Surgery</full-title></periodical><pages>51-60</pages><volume>1</volume><number>2</number><dates><year>2005</year></dates><urls></urls></record></Cite></EndNote>[4], and two studies did not find the difference to be significant PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NYXJrYXI8L0F1dGhvcj48WWVhcj4yMDEwPC9ZZWFyPjxS
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ADDIN EN.CITE.DATA [3, 9]. In the study by Andreasen et al the EVH group had a mean duration of surgery, which was 15.67 minutes longer than the OVH group; however, the EVH group had a slightly higher number of anastomoses, and a slightly larger percentage of on-pump surgeries, i.e. CABG performed with the use of extracorporeal circulation (ECC) PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BbmRyZWFzZW48L0F1dGhvcj48WWVhcj4yMDA4PC9ZZWFy
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ADDIN EN.CITE.DATA [5]. These intraoperative findings were not statistically significant, but may have contributed to a slightly increased duration of surgery and we therefore performed econometric modelling to assess how much of the time difference could be explained by the endoscopic harvesting procedure. The explained variable was duration of surgery and the explanatory variables were: use of EVH, number of anastomoses, male, Euroscore and use of ECC; results are seen in Table 2. The R-squared showed that the model explained 24.5 % of the variation in the duration of surgery. The coefficient of the EVH dummy variable was not significant; however, we found it to be the best available estimate of how much the duration of surgery increased by using EVH as opposed to OVH. We therefore corrected the duration of surgery from a mean difference of 15.67 minutes to a mean difference of 5.57 minutes by subtracting 10.1 minutes from each patient in the EVH, thereby leaving the standard error unchanged. ADDIN EN.CITE <EndNote><Cite><Author>Wooldridge</Author><Year>2009</Year><RecNum>61</RecNum><record><rec-number>61</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">61</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Wooldridge, Jeffrey M.</author></authors></contributors><titles><title>Introductory Econometrics - A modern</title></titles><pages>865</pages><edition>4th</edition><dates><year>2009</year></dates><publisher>South-Western</publisher><isbn>978-0-324-78890-7</isbn><urls></urls><language>English</language></record></Cite></EndNote>[14] In the fourth cost-level, ICER 4 & 8, we included all costs of initiated treatments for surgical wound infections (SWIs) of the leg at Table 3Resources consumedEVH group* OVH group* Mean difference (95% CI)Price [reference]Included in analysis ICER 1 & 5n=66n=63Disposable endoscopic equipment1.00±0.00-1.00 (1.00 to 1.00)? 535.84 [LC]Readmission due to leg-SWIs** (days)00.06±0.06-0.06 (-0.19 to 0.06)? 384.71 ADDIN EN.CITE <EndNote><Cite><Author>Pedersen</Author><Year>2009</Year><RecNum>70</RecNum><record><rec-number>70</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">70</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Pedersen, Kjeld M?ller</author></authors></contributors><titles><title>Economic priorities of the healthcare system</title></titles><dates><year>2009</year></dates><urls><related-urls><url>;[15]Surgical revision, in general anesthesia00.03±0.03-0.03 (-0.09 to 0.03)? 500.64 [LC]Revisons without general anesthesia00.02±0.02-0.02 (-0.05 to 0.01)? 235.29V.A.C. machine (days)00.06±0.06-0.06 (-0.19 to 0.06)? 44.12 [LC]Orthopedic assessments in hospital00.03±0.03-0.03 (-0.09 to 0.03)? 91.88 ADDIN EN.CITE <EndNote><Cite><Author>The_Ministry_of_the_Interior_and_Health</Author><Year>2011</Year><RecNum>68</RecNum><record><rec-number>68</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">68</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>The_Ministry_of_the_Interior_and_Health</author></authors></contributors><titles><title>Outpatient clinic fees (DAGS) 2011</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[16]Visits to GP0.03±0.020.70±0.36-0.67 (-1.37 to 0.04)? 29.85 ADDIN EN.CITE <EndNote><Cite><Author>Danish_Medical_Association</Author><Year>2011</Year><RecNum>66</RecNum><record><rec-number>66</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">66</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Danish_Medical_Association</author></authors></contributors><titles><title>§ 56 Daytime service fees</title></titles><dates><year>2011</year></dates><urls><related-urls><url> app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">67</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Danish_Medical_Association</author></authors></contributors><titles><title>§ 75 Capitation</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[17, 18]Visits to outpatient clinic00.05±0.04-0.05 (-0.12 to 0.02)? 139.41 ADDIN EN.CITE <EndNote><Cite><Author>The_Ministry_of_the_Interior_and_Health</Author><Year>2011</Year><RecNum>68</RecNum><record><rec-number>68</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">68</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>The_Ministry_of_the_Interior_and_Health</author></authors></contributors><titles><title>Outpatient clinic fees (DAGS) 2011</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[16]Visits by home care nurse00.48±0.27-0.48 (-1.00 to 0.05)? 26.50 [LC]Dressings used at post-discharge visits01.19±0.56-1.19 (-2.28 to -0.11)? 12.57 [LC]Post-discharge antibiotic treatment0,02±0,020.10±0.04-0.08 (-0.16 to 0.00)? 49.27 ADDIN EN.CITE <EndNote><Cite><Author>Dli_Danish_Pharmaceutical_Information</Author><Year>2011</Year><RecNum>69</RecNum><record><rec-number>69</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">69</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Dli_Danish_Pharmaceutical_Information</author></authors></contributors><titles><title>Antibiotics </title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[19]Added in analysis ICER 2 & 6Initial admission (days)11.52±0.7112.52±1.00-1.01 (-3.44 to 1.43)? 384.71 ADDIN EN.CITE <EndNote><Cite><Author>Pedersen</Author><Year>2009</Year><RecNum>70</RecNum><record><rec-number>70</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">70</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Pedersen, Kjeld M?ller</author></authors></contributors><titles><title>Economic priorities of the healthcare system</title></titles><dates><year>2009</year></dates><urls><related-urls><url>;[15]Added in analysis ICER 3 & 7Surgery time (minutes)221.73±7.49216.16±8.775.57 (-17.18 to 28.33)? 13.83 ADDIN EN.CITE <EndNote><Cite><Author>Rao</Author><Year>2008</Year><RecNum>2</RecNum><record><rec-number>2</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">2</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Rao, C.</author><author>Aziz, O.</author><author>Deeba, S.</author><author>Chow, A.</author><author>Jones, C.</author><author>Ni, Z.</author><author>Papastavrou, L.</author><author>Rahman, S.</author><author>Darzi, A.</author><author>Athanasiou, T.</author></authors></contributors><auth-address>Department of Biosurgery and Surgical Technology, Imperial College London, London, United Kingdom.</auth-address><titles><title>Is minimally invasive harvesting of the great saphenous vein for coronary artery bypass surgery a cost-effective technique?</title><secondary-title>J Thorac Cardiovasc Surg</secondary-title></titles><periodical><full-title>J Thorac Cardiovasc Surg</full-title></periodical><pages>809-15</pages><volume>135</volume><number>4</number><edition>2008/04/01</edition><keywords><keyword>Coronary Artery Bypass/*economics</keyword><keyword>Cost-Benefit Analysis</keyword><keyword>Humans</keyword><keyword>Monte Carlo Method</keyword><keyword>Quality of Life</keyword><keyword>Saphenous Vein/surgery/*transplantation</keyword><keyword>Surgical Procedures, Minimally Invasive/*economics</keyword><keyword>Tissue and Organ Harvesting/*economics</keyword></keywords><dates><year>2008</year><pub-dates><date>Apr</date></pub-dates></dates><isbn>1097-685X (Electronic)
0022-5223 (Linking)</isbn><accession-num>18374760</accession-num><urls><related-urls><url>(07)01657-1 [pii]
10.1016/j.jtcvs.2007.09.042</electronic-resource-num><language>eng</language></record></Cite></EndNote>[12]Changed from previous to analysis 4 & 8Readmission due to leg-SWIs** (days)00.19±0.19-0.19 (-0.56 to 0.18)? 384.71 ADDIN EN.CITE <EndNote><Cite><Author>Pedersen</Author><Year>2009</Year><RecNum>70</RecNum><record><rec-number>70</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">70</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Pedersen, Kjeld M?ller</author></authors></contributors><titles><title>Economic priorities of the healthcare system</title></titles><dates><year>2009</year></dates><urls><related-urls><url>;[15]Surgical revision, in general anesthesia00.05±0.05-0.05 (-0.14 to 0.04)? 500.64 [LC]Revisons without general anesthesia00.03±0.03-0.03 (-0.09 to 0.03)? 235.29V.A.C. machine (days)00.16±0.16-0.16 (-0.47 to 0.15)? 44.12 [LC]Visits to outpatient clinic00.08±0.06-0.08 (-0.19 to 0.03)? 139.41 ADDIN EN.CITE <EndNote><Cite><Author>The_Ministry_of_the_Interior_and_Health</Author><Year>2011</Year><RecNum>68</RecNum><record><rec-number>68</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">68</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>The_Ministry_of_the_Interior_and_Health</author></authors></contributors><titles><title>Outpatient clinic fees (DAGS) 2011</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[16]LC, locally collected; SWIs, surgical wound infections; V.A.C., vacuum assisted closure; GP, general practitioner.*Values are means ±Standard Error. ** Due to leg wound complications35 days postoperatively. This analysis was constructed because a study by Swenne et al showed that following CABG 73 % of SWIs of the leg are diagnosed within the first 30 days postoperatively and the remaining 27 % between days 31 to 60 postoperatively ADDIN EN.CITE <EndNote><Cite><Author>Swenne</Author><Year>2004</Year><RecNum>56</RecNum><record><rec-number>56</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">56</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Swenne, C. L.</author><author>Lindholm, C.</author><author>Borowiec, J.</author><author>Carlsson, M.</author></authors></contributors><auth-address>FoUU-board, Karolinska University Hospital, H4:06, Stockholm, Sweden. christine.leo.swenne@akademiska.se</auth-address><titles><title>Surgical-site infections within 60 days of coronary artery by-pass graft surgery</title><secondary-title>J Hosp Infect</secondary-title></titles><periodical><full-title>J Hosp Infect</full-title></periodical><pages>14-24</pages><volume>57</volume><number>1</number><edition>2004/05/15</edition><keywords><keyword>Adult</keyword><keyword>Aged</keyword><keyword>Aged, 80 and over</keyword><keyword>Coronary Artery Bypass/*adverse effects</keyword><keyword>Cross Infection/*epidemiology/prevention & control</keyword><keyword>Female</keyword><keyword>Humans</keyword><keyword>Leg/microbiology</keyword><keyword>Male</keyword><keyword>Middle Aged</keyword><keyword>Risk Assessment</keyword><keyword>Risk Factors</keyword><keyword>Sentinel Surveillance</keyword><keyword>Sternum/microbiology</keyword><keyword>Surgical Wound Infection/*epidemiology/prevention & control</keyword><keyword>Sweden/epidemiology</keyword><keyword>Time Factors</keyword></keywords><dates><year>2004</year><pub-dates><date>May</date></pub-dates></dates><isbn>0195-6701 (Print)
0195-6701 (Linking)</isbn><accession-num>15142711</accession-num><urls><related-urls><url> [pii]</electronic-resource-num><language>eng</language></record></Cite></EndNote>[20]. This implies that costs due to SWIs will occur, to some extent, after 35 days postoperatively.The mean (±SE) resource consumption, and corresponding unit price for each cost-level are given in Table 3. All unit prices shown are 2011 values in Danish Crowns (DKK) which was subsequently converted to Great British Pounds (GBP) using the exchange rate ? 1 GBP = 8.5 DKK. Some unit prices for medical equipment were 2009 values and therefore we subsequently converted them to 2011 prices by multiplying 2009 values with 1.09 which the retail price index for medical products, appliances and equipment increased with during the period ADDIN EN.CITE <EndNote><Cite><Author>Statistics_Denmark</Author><Year>2011</Year><RecNum>64</RecNum><record><rec-number>64</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">64</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Statistics_Denmark</author></authors></contributors><titles><title>retail price index for medical products, appliances and equipment 2009-2011</title></titles><dates><year>2011</year></dates><urls><related-urls><url> and Danish</language></record></Cite></EndNote>[21]. As the unit price for a minute of cardiothoracic theatre time we used the price reported by Rao et al, which was $ 21.78 United States Dollars (USD), and converted it to GBP using an exchange rate of $ 1 USD = ? 0.6164 GBP. Subsequently we converted this 2007 unit price of cardiothoracic theatre time to a 2011 value by multiplying it with 1.03 which the retail price index for hospital treatments increased with during the period ADDIN EN.CITE <EndNote><Cite><Author>Statistics_Denmark</Author><Year>2011</Year><RecNum>64</RecNum><record><rec-number>64</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">64</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Statistics_Denmark</author></authors></contributors><titles><title>retail price index for medical products, appliances and equipment 2009-2011</title></titles><dates><year>2011</year></dates><urls><related-urls><url> and Danish</language></record></Cite></EndNote>[21]. When calculating unit costs for the medical staff we used average total annual incomes, including all benefits, from Odense Hospital, Denmark, under the assumption that a year contained 1400 effective hours of work ADDIN EN.CITE <EndNote><Cite><Author>?konomistyrelsen</Author><Year>2003</Year><RecNum>58</RecNum><record><rec-number>58</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">58</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>?konomistyrelsen</author></authors></contributors><titles><title>Appendix 1 for "Unders?gelse af ressourceanvendelsen i Danmarks Statistik"</title></titles><dates><year>2003</year></dates><urls><related-urls><url> app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">73</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Odense_Universitetshospital</author></authors></contributors><titles><title>Mini-MTV 2011 [mini-HTA (in Danish)]</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[22, 23]. However, reports have shown that healthcare assistants spend 56 % of their time (1077 hours per year) at recipients? home and we assumed that this factor was the same for visiting homecare nurses and that an average visit was 30 minutes ADDIN EN.CITE <EndNote><Cite><Author>Arendt</Author><Year>2002</Year><RecNum>71</RecNum><record><rec-number>71</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">71</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Arendt, Jacob Nielsen</author><author>Hansen, Eigil Boll</author><author>Thrane, Thomas Kvistholm</author></authors></contributors><titles><title>?ldres funktionsevne og offentlige social- og sundhedsudgifter</title></titles><dates><year>2002</year></dates><publisher>AKF</publisher><urls><related-urls><url> app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">72</key></foreign-keys><ref-type name="Report">27</ref-type><contributors><authors><author>Kommunernes_Landsforening</author></authors><tertiary-authors><author>Kommunernes Landsforenings Forlag</author></tertiary-authors></contributors><titles><title>Tal p? tid - tale om tid. Standard for tidsregistering i hjemmeplejen [Standard for registration of time use in community care. (in Danish)]</title></titles><dates><year>2001</year></dates><urls></urls></record></Cite><Cite><Author>Odense_Universitetshospital</Author><Year>2011</Year><RecNum>73</RecNum><record><rec-number>73</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">73</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Odense_Universitetshospital</author></authors></contributors><titles><title>Mini-MTV 2011 [mini-HTA (in Danish)]</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[23-25]. With the exception of use of disposable endoscopic equipment, all information was available at a patient-level. The use of disposable endoscopic equipment was therefore estimated post hoc and we assumed that one unit had been used for all patients in the EVH group. Unit prices for general practitioner (GP) visits were calculated by multiplying GP service fees with two, as GPs receive approximately half their pay from capitation and half from service fees ADDIN EN.CITE <EndNote><Cite><Author>Danish_Medical_Association</Author><Year>2011</Year><RecNum>66</RecNum><record><rec-number>66</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">66</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Danish_Medical_Association</author></authors></contributors><titles><title>§ 56 Daytime service fees</title></titles><dates><year>2011</year></dates><urls><related-urls><url> app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">67</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>Danish_Medical_Association</author></authors></contributors><titles><title>§ 75 Capitation</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[17, 18]. Capital expenditures were discounted at 5 % and the annuity method was used to find the annual cost for 5 years and the costs were subsequently divided onto 300 patients per year ADDIN EN.CITE <EndNote><Cite><Author>Drummond</Author><Year>2005</Year><RecNum>6</RecNum><record><rec-number>6</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">6</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Drummond, Michael F</author><author>Sculpher, Mark J</author><author>Torrance, George W</author><author>O?Brien, Bernie J</author><author>Stoddart, Greg L</author></authors></contributors><titles><title>Methods for the Economic Evaluation of Health Care Programmes</title></titles><edition>3.</edition><section>379</section><dates><year>2005</year></dates><publisher>Oxford University Press</publisher><isbn>978-019-852944-6 (Hbk)</isbn><urls></urls><language>English</language></record></Cite></EndNote>[13]. An initial investment of ? 53,000 (undiscounted) was made in The Guidant VasoView? 6 Endoscopic Harvesting System (Guidant Corporation, CA, USA), making it ? 45.16 per patient when discounted. The surgeon (JJA), who performed all EVH in the study, initially completed 30 EVH cases before the trial began to overcome the learning curve. Vein harvest times were collected for all 30 cases and compared to the mean OVH time in the study and the additional time spend in surgery was used to estimate the cost of learning the procedure in conjunction with travelling expenses to courses on EVH and its corresponding time consumption. The cost of learning the procedure reached an estimated ? 5,200 (undiscounted) and ? 4.32 per patient when discounted. Outcomes measurementThe study by Andreasen et al was not originally designed for a health economic evaluation and as a result patients were not asked to score their quality of life (Qol). Therefore, to estimate patient outcome the authors performed a Qol conversion using patients VAS score of pain located to the harvest site and their grading of the cosmetic result. Patients were asked to score their current pain-level at day 5, and at day 35 they were asked to rate their satisfaction with the cosmetic result and their average pain-level between day 6 and day 35. For all analyses, ICER 1-8, the VAS scores of pain were converted to answers on the EuroQol-5Dimension (EQ-5D) questionnaire regarding pain/discomfort, and cosmetic scores to EQ-5D answers regarding anxiety/depression, and consequently assigned a Qol score from the Danish Time Trade-Off (TTO) for EQ-5D ADDIN EN.CITE <EndNote><Cite><Author>Wittrup-Jensen</Author><Year>2009</Year><RecNum>26</RecNum><record><rec-number>26</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">26</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wittrup-Jensen, K. U.</author><author>Lauridsen, J.</author><author>Gudex, C.</author><author>Pedersen, K. M.</author></authors></contributors><auth-address>Global Health Economics, Outcomes & Reimbursement, Bayer Schering Pharma AG, Berlin, Germany.</auth-address><titles><title>Generation of a Danish TTO value set for EQ-5D health states</title><secondary-title>Scand J Public Health</secondary-title></titles><periodical><full-title>Scand J Public Health</full-title></periodical><pages>459-66</pages><volume>37</volume><number>5</number><edition>2009/05/05</edition><keywords><keyword>Adult</keyword><keyword>Cost-Benefit Analysis</keyword><keyword>Denmark/epidemiology</keyword><keyword>Female</keyword><keyword>Health Policy/economics</keyword><keyword>*Health Status</keyword><keyword>Health Surveys</keyword><keyword>Humans</keyword><keyword>Male</keyword><keyword>*Outcome Assessment (Health Care)</keyword><keyword>*Quality of Life</keyword><keyword>Questionnaires</keyword><keyword>Self Concept</keyword><keyword>Time Factors</keyword></keywords><dates><year>2009</year><pub-dates><date>Jul</date></pub-dates></dates><isbn>1403-4948 (Print)
1403-4948 (Linking)</isbn><accession-num>19411320</accession-num><urls><related-urls><url> [pii]
10.1177/1403494809105287</electronic-resource-num><language>eng</language></record></Cite></EndNote>[26]. VAS scores of 0-3 were interpreted as the health state “no pain or discomfort”, VAS scores of 4-8 as the health state “moderate pain or discomfort” and VAS scores of 9-10 as Table 4Qol conversion of VAS and cosmetic scoresEVH OVH Qol change ICER 1-8n=66n=61/63Pain, day 5No. scoring 0-3 on a VAS65580No. scoring 4-8 on a VAS13-0.062No. scoring 9-10 on a VAS00-0.396Mean pain, day 6-35n=66n=62/63No. scoring 0-3 on a VAS65560No. scoring 4-8 on a VAS16-0.062No. scoring 9-10 on a VAS00-0.396Cosmetic score, day 35n=66n=62/63No. scoring "unacceptable"02-0.068ICER 5-8*Mobility, day 2No. scoring 10-7 on a VAS5700No. scoring 6-2 on a VAS963-0.053No. scoring 1-0 on a VAS00-0.411Mobility, day 35No. scoring 10-7 on a VAS66630No. scoring 6-2 on a VAS00-0.053No. scoring 1-0 on a VAS00-0.411*not patient level datathe health state “extreme pain or discomfort” PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5Db2xsaW5zPC9BdXRob3I+PFllYXI+MTk5NzwvWWVhcj48
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ADDIN EN.CITE.DATA [27-29]. The patients judged the cosmetic results on a scale graduated as follows: unacceptable = 1, not satisfied = 2, satisfied = 3, very satisfied = 4 and extremely satisfied = 5. For all analyses, ICER 1-8, the patients who felt the cosmetic result of the vein harvest was “unacceptable” were assigned the health state “moderately anxious or depressed” ADDIN EN.CITE <EndNote><Cite><Author>The_EuroQol_Group</Author><Year>2011</Year><RecNum>55</RecNum><record><rec-number>55</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">55</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>The_EuroQol_Group</author></authors></contributors><titles><title>How to obtain EQ-5D - The UK English EQ-5D-3L</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[29]. No information regarding patients’ mobility was collected. However, it seems evident that endoscopic harvesting of the vein increases patients’ postoperative mobility PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5LaWFpaTwvQXV0aG9yPjxZZWFyPjIwMDI8L1llYXI+PFJl
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ADDIN EN.CITE.DATA [8]. In their study mobility was judged by patients at discharge and at 6 weeks postoperatively using a horizontal VAS of 0 to 10 where 0 was “unable to walk” and 10 was “excellent mobilisation”. For EVH the mean mobility score (±SD) was 8.8 (±0.8) at discharge and 9.8 (±0.5) at 6 weeks, whereas for OVH the mean mobility score was 6.4 (±1.3) at discharge and 7.0 (±3.5) at 6 weeks. Mobility VAS scores of 10-7 were interpreted as the health state “no problems in walking about”, mobility VAS scores of 6-2 as the health state “some problems in walking about” and mobility VAS scores of 1-0 as the health state “confined to bed” ADDIN EN.CITE <EndNote><Cite><Author>The_EuroQol_Group</Author><Year>2011</Year><RecNum>55</RecNum><record><rec-number>55</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">55</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>The_EuroQol_Group</author></authors></contributors><titles><title>How to obtain EQ-5D - The UK English EQ-5D-3L</title></titles><dates><year>2011</year></dates><urls><related-urls><url>;[29]. The conversion rate for EVH to OVH was 14 % (9 of 66 patients) it was assumed that these patients had the same reduction in Qol as the OVH patients, regarding mobility for the sensitivity analysis. The assumptions made for the Qol conversion are summarised in Table 4.To calculate the incremental Quality Adjusted Life-Years (QALYs) associated with the EVH and OVH procedures we assumed that the Qol changed in a linear manner between two measurements, however, there was one exception. On day 35, patients were asked to score their average pain-level between day 6 and day 35, and consequently we used these VAS score as the average of the timeframe between day 6 and day 35. Although cosmetic results could be considered permanent, we assumed patients had learned to live with their results 35 days postoperatively, that leg wound pain subsided 35 days postoperatively and that any restriction in mobility had nothing to do with the leg wound beyond 35 days postoperatively. Assumptions were made to give intentional conservative estimates on the QALY payoff from the EVH procedure. Analysis The data were analysed by the intention-to-treat method. The groups? preoperative baseline characteristics were compared using t-tests for continuous variables and chi-squared tests for categorical variables. Mean costs and effects where estimated by performing 5,000 bootstrap re-samples and 95 % confidence intervals (CI), for mean differences, were calculated using ±2*bootstrap standard error ADDIN EN.CITE <EndNote><Cite><Author>Bowers</Author><Year>2002</Year><RecNum>59</RecNum><record><rec-number>59</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">59</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Bowers, David</author></authors></contributors><titles><title>Medical statistics from scratch</title></titles><pages>208</pages><section>98-110</section><dates><year>2002</year></dates><pub-location>Leed, UK</pub-location><publisher>Wiley</publisher><isbn>978-0-470-84474-8</isbn><urls></urls><language>English</language></record></Cite></EndNote>[30]. ICERs were calculated for all analyses based on 5,000 bootstrap re-samples ADDIN EN.CITE <EndNote><Cite><Author>Willan</Author><Year>2006</Year><RecNum>65</RecNum><record><rec-number>65</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">65</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Willan, Andrew R.</author><author>Briggs, Andrew H.</author></authors></contributors><titles><title>Statistical analysis of Cost-effectiveness Data</title></titles><pages>196</pages><section>54-57</section><dates><year>2006</year></dates><publisher>John Wiley sons, Ltd</publisher><isbn>978-0-470-85626-0</isbn><urls></urls><language>English</language></record></Cite></EndNote>[31]. Cost-effectiveness acceptability curves (CEACs) were based on a dataset which contained the mean difference in costs and QALYs between the bootstrap re-samples of the EVH group and the OVH group. CEACs were interpreted using a willingness-to-pay (WTP) threshold of ? 30,000/QALY. For all analyses, bias corrected means were calculated during the bootstrap process. Econometric modelling was performed to estimate how much of the increased duration of surgery, in the EVH group compared to the OVH group, could be attributed the harvesting method ADDIN EN.CITE <EndNote><Cite><Author>Juul</Author><Year>2008</Year><RecNum>62</RecNum><record><rec-number>62</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">62</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Juul, Svend</author></authors></contributors><titles><title>An Introduction to Stata for Health Researchers</title></titles><pages>361</pages><edition>2nd</edition><dates><year>2008</year></dates><pub-location>College Station</pub-location><publisher>Stata Press</publisher><isbn>978-1-59718-044-3</isbn><urls><related-urls><url> app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">61</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Wooldridge, Jeffrey M.</author></authors></contributors><titles><title>Introductory Econometrics - A modern</title></titles><pages>865</pages><edition>4th</edition><dates><year>2009</year></dates><publisher>South-Western</publisher><isbn>978-0-324-78890-7</isbn><urls></urls><language>English</language></record></Cite></EndNote>[14, 32]. All calculations and analyses of data were performed in Stata version 11.1 (StataCorp, College Station, Texas, USA) and CEACs were drawn in Graph version 4.3 (General Public License product).ResultsTable 5 shows the mean costs per person, with the corresponding bootstrap SE, for each type of resource used. The main costs in the EVH group were the disposable endoscopic kit and the surgery time, whereas costs due to treatment of SWIs of the leg and initial investments were of minor importance. In the OVH group an extra day?s initial admission and miscellaneous treatments of SWIs of the leg carried the greatest costs. Regarding outcome, the analyses ICER 1-4 did not include the Qol influence of mobility, as this had not been measured in the study by Andreasen et al, and found a mean difference of 5.30E-4 QALY (95 % CI: 5.10E-4 to 5.50E-4). The analyses denominated ICER 5-8 included mean mobility scores from Kiaii et al and found a mean difference of 2.724E-3 QALY (95 % CI: 2.717E-3 to 2.731E-3), as seen in Table 6. In the analyses denominated ICER 1 & 5, where costs from hospital stay and surgery time were excluded, the mean difference in cost was ? 477.45 (95 % CI: 475.61 to 479.29). ICERs therefore varied depending on whether the costs from the first cost-level were compared to outcomes without mobility, ICER 1 ? 900,858/QALY, or including mobility, ICER 5 ? 175,277/QALY. When adding costs from the hospital, as done in the second cost-level, the mean difference in cost changed to ? 99.39 (95 % CI: 85.95 to 112.83) as this cost was greatest in the OVH group. ICER 2 and ICER 6 therefore became ? 187,523/QALY and ? 36,486/QALY respectively. In the third cost-level we added cost of surgery time to the analysis and the mean difference in cost increased to ? 175.65 (95 % CI: 161.57 to 189.73) as this study estimated that 5.57 minutes, out of the 15.67 minutes which the duration of surgery was increased by, could be explained by the use of EVH in the econometric model presented in Table 2. Resulting from the increased mean difference in cost, ICER 3 and ICER 7 increased to ? 331,413/QALY and ? 64,482/QALY respectively. When costs of treatments of SWIs of the leg initiated at 35 days postoperatively were included to the fourth cost-level the mean difference in cost declined to ? 105.90 (95 % CI: 91.54 to 120.26) as only patients from the OVH group had additional treatments initiated at this point. As OVH costs rose, ICER 4 and ICER 8 Table 5Mean costs and outcomes (±bootstrap SE)EVH group (mean±SE)OVH group (mean±SE)Included in analysis ICER 1 & 5n=66n=63Inital invesment in EVH equipment*? 45.16±0.00-Intial training of staff in EVH-method*? 4.32±0.00-Disposable endoscopic equipment? 535.84±0.00-Readmission due to leg-SWIs0? 24.43±24.25Wound revisions0? 19.63±16.13VAC rent 0? 2.80±2.78Orthopedic assessments in hospital0 ? 2.92±2.85Visits to GP? 0.90±0.63? 20.85±10.66Visits to outpatient clinic0? 6.64±4.81Visits by home care nurse0? 12.62±7.16Dressings used at post-discharge visits0? 14.96±6.93Post-discharge antibiotic treatment? 1.01±1.01? 4.41±2.02Added in analysis ICER 2 & 6Initial admission? 4,429.95±273.54? 4,817.98±380.80Added in analysis ICER 3 & 7Surgery time ? 3,066.11±101.96? 2,989.03±119.79Changed from previous to analysis ICER 4 & 8Readmission due to leg-SWIs0? 73.28±72.74Wound revisions0? 31.31±31.08VAC rent0? 7.00±6.95Visits to outpatient clinic0? 11.06±7.82Outcomes for analysis ICER 1-4QALY payoff0.09581±7.73E??0.09528±2.05E??Outcomes for analysis ICER 5-8QALY payoff**0.09546±1.31E??0.09274±2.05E??SWIs, surgical wound infections. V.A.C., vacuum assisted closure. GP general practitioner*discounted at 5%, divided on 300 patients/year for 5 years. ** Qol payoff for mobility added, still 35 day followupTable 6Main results Analysis Mean difference in costs (95%CI)Mean difference in effects (95%CI)ICERICER 1? 477.45 (475.61 to 479.29)0.000530 (0.000510 to 0.000550)900,858ICER 2? 99.39 (85.95 to 112.83)0.000530 (0.000510 to 0.000550)187,523ICER 3? 175.65 (161.57 to 189.73)0.000530 (0.000510 to 0.000550)331,413ICER 4? 105.90 (91.54 to 120.26)0.000530 (0.000510 to 0.000550)199,807ICER 5? 477.45 (475.61 to 479.29)0.002724 (0.002717 to 0.002731)175,277ICER 6? 99.39 (85.95 to 112.83)0.002724 (0.002717 to 0.002731)36,486ICER 7? 175.65 (161.57 to 189.73)0.002724 (0.002717 to 0.002731)64,482ICER 8? 105.90 (91.54 to 120.26)0.002724 (0.002717 to 0.002731)38,876Figure 1: CEACs for analyses without mobilityFigure 2: CEACs for analyses with mobilityfell to ? 199,807/QALY and ? 38,876/QALY respectively.Figure 1 shows the CEACs from the 4 analyses where mobility was not included, that is ICER 1-4. It is seen in Figure 1 that in all four analyses EVH is <1% cost-effective at a WTP of ? 30,000/QALY when mobility is not included in the analyses. Figure 2 shows the CEACs for the analyses which did include mobility in its outcome measurement, that ICER 5-8. In ICER 5 & 7 EVH was <1% cost-effective at a WTP of ? 30,000/QALY. However, when costs from treatments of SWIs of the leg initiated at 35 days postoperatively were included in ICER 8, EVH was estimated to be cost-effective in 1 % of the cases at a WTP of ? 30,000/QALY. DiscussionAs it has been suggested that both the LOS and the duration of surgery may not be significantly different between EVH and OVH PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NYXJrYXI8L0F1dGhvcj48WWVhcj4yMDEwPC9ZZWFyPjxS
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ADDIN EN.CITE.DATA [3, 9], and that 27 % of all SWIs of the leg are diagnosed after 30 days postoperatively ADDIN EN.CITE <EndNote><Cite><Author>Swenne</Author><Year>2004</Year><RecNum>56</RecNum><record><rec-number>56</rec-number><foreign-keys><key app="EN" db-id="tpw5fttxvftsdlevsf3xevzy2rt5tttvtad2">56</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Swenne, C. L.</author><author>Lindholm, C.</author><author>Borowiec, J.</author><author>Carlsson, M.</author></authors></contributors><auth-address>FoUU-board, Karolinska University Hospital, H4:06, Stockholm, Sweden. christine.leo.swenne@akademiska.se</auth-address><titles><title>Surgical-site infections within 60 days of coronary artery by-pass graft surgery</title><secondary-title>J Hosp Infect</secondary-title></titles><periodical><full-title>J Hosp Infect</full-title></periodical><pages>14-24</pages><volume>57</volume><number>1</number><edition>2004/05/15</edition><keywords><keyword>Adult</keyword><keyword>Aged</keyword><keyword>Aged, 80 and over</keyword><keyword>Coronary Artery Bypass/*adverse effects</keyword><keyword>Cross Infection/*epidemiology/prevention & control</keyword><keyword>Female</keyword><keyword>Humans</keyword><keyword>Leg/microbiology</keyword><keyword>Male</keyword><keyword>Middle Aged</keyword><keyword>Risk Assessment</keyword><keyword>Risk Factors</keyword><keyword>Sentinel Surveillance</keyword><keyword>Sternum/microbiology</keyword><keyword>Surgical Wound Infection/*epidemiology/prevention & control</keyword><keyword>Sweden/epidemiology</keyword><keyword>Time Factors</keyword></keywords><dates><year>2004</year><pub-dates><date>May</date></pub-dates></dates><isbn>0195-6701 (Print)
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ADDIN EN.CITE.DATA [2-4, 6, 9, 10]. Therefore, ICER 7 is of interest as it reflects the findings of the clinical literature and can be compared to the findings in CUA by Rao et al. Their results suggested that the EVH was the most cost-effective option with an ICER of $ 19,859/QALY (approximately ? 12,241 at an exchange rate of $ 1 USD = ? 0.6164 GBP) and it was 95.6 % cost-effective at a WTP $ 50,000USD/QALY. In comparison, ICER 7 was ? 64,482/QALY, which is 5.3 times greater than the results reported by Rao et al; however, some of this difference can be attributed to differences in study designs. Rao et al reported an incremental cost of $ 459 (? 283), which is 1.6 times greater than our findings, and an incremental effect of 0.0231 QALY over a 42 day-period, which is 8.5 times greater that our finding. The difference in the measurement of costs between the two studies can be explained mainly by the mean difference in duration of surgery. Where Rao et al used a mean difference of 15.26 minutes, we used a mean difference of 5.57 minutes. The 8.5 times greater QALY effect estimated by Rao et al can be explained by three things. Firstly, on a VAS scale of pain, Rao et al estimated leg wound pain at discharge to be 1.1 (SD±2) for EVH patients and 4.7 (SD±1.8) for OVH patients, whereas Andreasen et al found leg wound pain to be 0.52 (SD±1.04) for EVH patients and 0.87 (SD±1.22) for OVH patients at day 5 postoperatively. We argue that patients in the study used by Rao et al did not receive sufficient treatment for their pain or were not asked merely to score leg wound pain, which might cause the EVH effect on postoperative pain to be overestimated. Secondly, it seems that the study by Rao et al did not account for the fact that some EVH patients must be converted to OVH, thereby reducing their mobility related Qol in the same manner as the patients in the OVH group. Thirdly, we used a 35 days follow-up regarding outcomes, whereas Rao et al used a 42 days follow-up period, which may be better at capturing the full effect of using the EVH method. However, overestimating the pain related Qol gain in the EVH group, and ignoring the facts that some EVH must be converted to OVH, will potentially bias results toward the EVH method, and we feel that the inclusion of these factors in our study is a major strength. The result of ICER 8 raises the question, whether a 35 days follow-up period is sufficient to obtain an unbiased estimate of the cost-effectiveness of EVH compared to OVH. In the fourth cost-level used for ICER 8 we included all costs of initiated treatments for SWIs of the leg at 35 days postoperatively, and as a result the ICER changed from ? 64,482/QALY to ? 38,876/QALY, and the EVH method became approximately 2 % cost-effective at a WTP of ? 30,000/QALY. In our opinion, this suggests that 35 days may not be a sufficient follow-up period to capture all relevant costs and outcomes of the two methods, and the follow-up period used in this study may, as a result, be viewed as a limitation of the study. LimitationsIn general, performing a post hoc CUA is a limitation as the study by Andreasen et al was neither designed, nor powered for health economic evaluation. This causes limitations not only due to a follow-up period, which may possibly be too short, but also from sample size, cost and outcome measurements. Due to the sample size, most of the mean differences in resource consumption were not significantly different from 0. Therefore, interpretation of most results on costs must be done with caution, and especially ICER 8, where EVH was estimated 2 % cost-effective at a WTP of ? 30,000/QALY, since none of the costs added in the analysis were significantly different from 0. Because the study by Andreasen et al did not include results from an EQ-5D questionnaire, we resorted to a Qol conversion. Decision makers must therefore evaluate whether they find our conversion appropriate, especially the mobility-related Qol conversion, as we were unable to find references on how mobility, measured on a VAS, could be converted to EQ-5D answers. Another limitation of this study includes the mixing of experimental data with observational data. When mean measures of used disposable endoscopic equipment and mobility are used, the calculated standard error will not reflect the true variation of data, causing the confidence interval to be biased for both costs and outcomes. However, excluding mobility merely for this reason would bias results far more, as it was seen in ICER 1-4. A consequence of our strategy to evaluate cost-effectiveness within the first 35 days postoperatively was that we assumed that all patients were followed exactly until day 35 postoperatively. However, they were not; median time from the surgery follow-up was 35 days (range: 21-49days) and this could potentially bias our results. In addition bootstrap analysis captures variation due to differences in quantities consumed in the two groups, but does not capture uncertainty which comes from varying unit prices in decision analytic modeling. However, this limitation will be addressed by performing sensitivity analyses on unit prices before submission of the manuscript. Future workRecently, the medium- and long-term graft patency has become a major concern, as EVH has been associated with increased rates of vein graft failure and adverse clinical outcomes such as death, myocardial infarction or repeated revascularisation PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5Mb3BlczwvQXV0aG9yPjxZZWFyPjIwMDk8L1llYXI+PFJl
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ADDIN EN.CITE.DATA [3, 10, 33, 34]. Further research is therefore needed to establish the long-term cost-effectiveness of EVH.ConclusionWe conclude that, within the first five weeks postoperatively, EVH is not a cost-effective method for harvesting a short saphenous vein segment during CABG, when compared to OVH. The finding of our study is especially interesting as the long-term patency of EVH grafts is now also being questioned.References ADDIN EN.REFLIST 1.Cadwallader, R.A., et al., Great saphenous vein harvesting: a systematic review and meta-analysis of open versus endoscopic techniques. Vasc Endovascular Surg, 2009. 43(6): p. 561-6.2.Cheng, D., et al., Endoscopic Vascular Harvest in Coronary Artery Bypass Grafting Surgery: A Meta-Analysis of Randomized Trials and Controlled Trials. 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