The Royal Children's Hospital : The Royal Children's Hospital
Prevention of hypocalcaemia after total thyroidectomy in children and adolescentsFULL DOCUMENTBackground Hypocalcaemia is the most common complication of total thyroidectomy and is secondary to insufficient parathyroid hormone (PTH) production. Hypocalcaemia due to primary hypoparathyroidism is generally transient, reflecting the mechanical trauma caused by total thyroidectomy on otherwise preserved parathyroid glands. In up to 4% of patients, it can be prolonged (>6-12 months) or permanent if the parathyroid glands have been removed or significantly damaged PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5LdW5kZWw8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (1, 2).Studies in adults reported incidences of hypocalcaemia ranging from 1 to 50%, with most centres around 20-30%. In contrast, paediatric studies found that 30 to 40% of children developed parathyroid dysfunction after total thyroidectomy, the majority transient PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GcmVpcmU8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (1, 4, 5). The nadir for hypocalcaemia usually occurs 24-48 hours postoperatively, although it may occur as early as 12 hours postoperatively or be delayed by 4 days ADDIN EN.CITE <EndNote><Cite><Author>Grodski</Author><Year>2008</Year><RecNum>10</RecNum><DisplayText>(6)</DisplayText><record><rec-number>10</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1499455667">10</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Grodski, S.</author><author>Serpell, J.</author></authors></contributors><auth-address>The Alfred Hospital, Monash University Endocrine Surgery Unit, Melbourne, VIC, 3144, Australia. grodski@</auth-address><titles><title>Evidence for the role of perioperative PTH measurement after total thyroidectomy as a predictor of hypocalcemia</title><secondary-title>World J Surg</secondary-title></titles><periodical><full-title>World J Surg</full-title></periodical><pages>1367-73</pages><volume>32</volume><number>7</number><keywords><keyword>Calcium/blood</keyword><keyword>Humans</keyword><keyword>Hypocalcemia/*blood/*diagnosis/drug therapy/etiology</keyword><keyword>Monitoring, Intraoperative</keyword><keyword>Parathyroid Glands/injuries</keyword><keyword>Parathyroid Hormone/*blood</keyword><keyword>Perioperative Care</keyword><keyword>Predictive Value of Tests</keyword><keyword>Thyroid Diseases/*surgery</keyword><keyword>Thyroidectomy/*adverse effects</keyword></keywords><dates><year>2008</year><pub-dates><date>Jul</date></pub-dates></dates><isbn>0364-2313 (Print)
0364-2313 (Linking)</isbn><accession-num>18340480</accession-num><urls><related-urls><url>;(6). Hypocalcaemia is associated with patient morbidity, mortality, increased length of stay and treatment costs. ADDIN EN.CITE <EndNote><Cite><Author>McHenry</Author><Year>1997</Year><RecNum>37</RecNum><DisplayText>(7)</DisplayText><record><rec-number>37</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1500933463">37</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>McHenry, C. R.</author></authors></contributors><auth-address>Department of Surgery, Metrohealth Medical Center, Cleveland, OH 44109-1998, USA.</auth-address><titles><title>"Same-day" thyroid surgery: an analysis of safety, cost savings, and outcome</title><secondary-title>Am Surg</secondary-title></titles><periodical><full-title>Am Surg</full-title></periodical><pages>586-9; discussion 589-90</pages><volume>63</volume><number>7</number><keywords><keyword>Adolescent</keyword><keyword>Adult</keyword><keyword>Aged</keyword><keyword>Aged, 80 and over</keyword><keyword>Ambulatory Surgical Procedures/*economics/*standards</keyword><keyword>Cost Savings</keyword><keyword>Female</keyword><keyword>Hospital Costs</keyword><keyword>Humans</keyword><keyword>Male</keyword><keyword>Middle Aged</keyword><keyword>Ohio</keyword><keyword>Retrospective Studies</keyword><keyword>Thyroid Diseases/*surgery</keyword><keyword>*Thyroidectomy/economics/methods</keyword><keyword>Treatment Outcome</keyword></keywords><dates><year>1997</year><pub-dates><date>Jul</date></pub-dates></dates><isbn>0003-1348 (Print)
0003-1348 (Linking)</isbn><accession-num>9202531</accession-num><urls><related-urls><url>;(7). Therefore, it is important to identify and monitor those at risk of post-thyroidectomy hypocalcaemia (PTHC) postoperatively so treatment and discharge be initiated in a timely manner.How to manageA pathway to streamline the perioperative assessment and management of patients undergoing total thyroidectomy is summarised in Figure 1. Preoperative managementPatient assessment should begin with ensuring normal serum 25-hydroxyvityamin D levels at least 1 month preoperatively. Give stoss dose cholecalciferol 150,000 IU if serum 25-hydroxyvitamin D is < 50 nmol/L if >12 months of age. If <12 months of age, refer to vitamin D guideline for treatment. ()Surgical team to inform inpatient endocrinology team on the day of surgery.Low preoperative serum 25-hydroxyitamin D level was also identified in some adult studies as a risk factor for PTHC PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5FcmJpbDwvQXV0aG9yPjxZZWFyPjIwMDc8L1llYXI+PFJl
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ADDIN EN.CITE.DATA (8-11). Intraoperative managementAlthough a low intraoperative serum PTH level (<1.06-1.6 pmol/L) can also indicate higher risk of PTHC PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GcmVpcmU8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (4), this test is not readily available at RCH and therefore not routinely used. However, a postoperative PTH level may be helpful in guiding management of patients who do develop hypocalcaemia (see postoperative assessment below).Postoperative managementPatients will be assessed and managed by the inpatient endocrinology team for hypocalcaemiaSerum calcium (ionised calcium or total calcium and albumin) and PTH level should be performed within 6 hours postoperatively. PTH testing with a timely turnover is not available at RCH and is therefore not likely to guide immediate treatment. However, once available, it can guide future management. A PTH of > 2.1 pmol/L in a normocalcaemic patient is reassuring PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GcmVpcmU8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (12). Clinical discretion should be used for PTH levels between 1.6 to 2.1 pmol/L in a normocalcaemic patient PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GcmVpcmU8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (4).Prophylactic calcium or calcium and calcitriol replacement should be started orally once patient is able to tolerate oral intake within 12 hours postoperatively.Routine postoperative prophylactic replacement of calcium with or without calcitriol has been shown to reduce PTHC PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5CZWxsYW50b25lPC9BdXRob3I+PFllYXI+MjAwMjwvWWVh
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ADDIN EN.CITE.DATA (13). Prophylactic calcium and calcitriol should be given to “high risk” patients PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5DaGVuPC9BdXRob3I+PFllYXI+MjAxNTwvWWVhcj48UmVj
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ADDIN EN.CITE.DATA (14, 15) and prophylactic calcium only to those with are “low risk”.High risk patients High risk patients are those who meets criteria for one of the following: ParathyroidectomyParathyroid tissue damage or devascularisation/reimplantationLymph node or central dissectionHyperthyroidismYoung age ( 6 years of age).-635890536Suggested prophylactic Calcitriol doses:Age 1-5 years: Calcitriol 0.25 mcg BIDAge 6-10 years: Calcitriol 0.5 mcg BIDAge > 10 years and adults: Calcitriol 1 mcg BIDPlease chart the same dose for PRN if patient develops symptoms of hypocalcaemia.0Suggested prophylactic Calcitriol doses:Age 1-5 years: Calcitriol 0.25 mcg BIDAge 6-10 years: Calcitriol 0.5 mcg BIDAge > 10 years and adults: Calcitriol 1 mcg BIDPlease chart the same dose for PRN if patient develops symptoms of hypocalcaemia.If the patient is a high-risk patient or develops biochemical hypocalcaemia (total calcium < 2.0 mmol/L or ionised calcium < 0.9 mmol/L), a starting dose of Calcitriol 0.025-0.05 mcg/kg/day should be commenced postoperatively as soon as possible in addition to oral calcium carbonate as detailed below ADDIN EN.CITE <EndNote><Cite><Author>Markowitz</Author><Year>1982</Year><RecNum>1017</RecNum><DisplayText>(16)</DisplayText><record><rec-number>1017</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1552426750">1017</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Markowitz, M. E.</author><author>Rosen, J. F.</author><author>Smith, C.</author><author>DeLuca, H. F.</author></authors></contributors><titles><title>1,25-dihydroxyvitamin D3-treated hypoparathyroidism: 35 patients years in 10 children</title><secondary-title>J Clin Endocrinol Metab</secondary-title></titles><periodical><full-title>J Clin Endocrinol Metab</full-title></periodical><pages>727-33</pages><volume>55</volume><number>4</number><edition>1982/10/01</edition><keywords><keyword>Adolescent</keyword><keyword>Calcitriol/adverse effects/blood/*therapeutic use</keyword><keyword>Calcium/blood/urine</keyword><keyword>Child</keyword><keyword>Child, Preschool</keyword><keyword>Female</keyword><keyword>Humans</keyword><keyword>Hypoparathyroidism/*drug therapy/metabolism</keyword><keyword>Infant</keyword><keyword>Male</keyword><keyword>Parathyroid Hormone</keyword><keyword>Phosphates/metabolism</keyword></keywords><dates><year>1982</year><pub-dates><date>Oct</date></pub-dates></dates><isbn>0021-972X (Print)
0021-972X (Linking)</isbn><accession-num>6896714</accession-num><urls><related-urls><url>;(16). Note: In patients with hypocalcaemia, higher doses of up to Calcitriol 100 ng/kg/day (adult dose: 1 – 1.5 mcg daily) may be required if patient develops severe hypocalcaemia ADDIN EN.CITE <EndNote><Cite><Author>Markowitz</Author><Year>1982</Year><RecNum>1017</RecNum><DisplayText>(16)</DisplayText><record><rec-number>1017</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1552426750">1017</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Markowitz, M. E.</author><author>Rosen, J. F.</author><author>Smith, C.</author><author>DeLuca, H. F.</author></authors></contributors><titles><title>1,25-dihydroxyvitamin D3-treated hypoparathyroidism: 35 patients years in 10 children</title><secondary-title>J Clin Endocrinol Metab</secondary-title></titles><periodical><full-title>J Clin Endocrinol Metab</full-title></periodical><pages>727-33</pages><volume>55</volume><number>4</number><edition>1982/10/01</edition><keywords><keyword>Adolescent</keyword><keyword>Calcitriol/adverse effects/blood/*therapeutic use</keyword><keyword>Calcium/blood/urine</keyword><keyword>Child</keyword><keyword>Child, Preschool</keyword><keyword>Female</keyword><keyword>Humans</keyword><keyword>Hypoparathyroidism/*drug therapy/metabolism</keyword><keyword>Infant</keyword><keyword>Male</keyword><keyword>Parathyroid Hormone</keyword><keyword>Phosphates/metabolism</keyword></keywords><dates><year>1982</year><pub-dates><date>Oct</date></pub-dates></dates><isbn>0021-972X (Print)
0021-972X (Linking)</isbn><accession-num>6896714</accession-num><urls><related-urls><url>;(16). An as-required (i.e. PRN) calcium (dose guide in the low risk section below) and Calcitriol order as per the age/weight guidelines should also be charted for treatment of hypocalcaemia between scheduled doses (e.g. calcitriol 0.5 mcg PRN and elemental calcium 600 mg PRN if symptoms of hypocalcaemia, in a 7 year old, 25 kg child).Calcium levels should be checked again at 12 hours postoperatively. If total serum calcium levels remain 2.0 mmol/L, then the patient can be discharged home once the surgical team has cleared the patient. If patient is discharged, serum calcium level should be rechecked 2-3 days after discharge. Patients who develop hypocalcaemia If the patient develops symptoms of hypocalcaemia (mild: muscle spasms or cramps, numbness or tingling periorally or in the extremities, fatigue; severe: tetany, seizures, laryngospasm, arrhythmia (prolonged QRS or QT), serum calcium and magnesium levels should be checked immediately. Treatment as per the “high risk” patients should commence as soon as possible. Calcium and calcitriol doses may be increased if patient develops hypocalcaemia while on calcium/calcitriol treatment. Intravenous calcium gluconate infusion should be considered only if the patient is unable to tolerate oral replacement, unless severe symptoms are present. As cutaneous necrosis and/or calcium deposition may occur with extravasation ADDIN EN.CITE <EndNote><Cite><Author>Young T</Author><Year>1999</Year><RecNum>1013</RecNum><DisplayText>(17)</DisplayText><record><rec-number>1013</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1552280039">1013</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Young T, Mangum O.</author></authors></contributors><titles><title>A Manual of Drugs Used in Neonatal Care</title></titles><dates><year>1999</year></dates><publisher>Neofax 12th Ed.</publisher><urls></urls></record></Cite></EndNote>(17), care must be given to the intravenous site to ensure it is free flowing prior to and during administration. Rapid infusion can also cause bradycardia or cardiac arrest and therefore cardiac monitoring and/or PICU involvement is required ADDIN EN.CITE <EndNote><Cite><Author>Young T</Author><Year>1999</Year><RecNum>1013</RecNum><DisplayText>(17)</DisplayText><record><rec-number>1013</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1552280039">1013</key></foreign-keys><ref-type name="Book">6</ref-type><contributors><authors><author>Young T, Mangum O.</author></authors></contributors><titles><title>A Manual of Drugs Used in Neonatal Care</title></titles><dates><year>1999</year></dates><publisher>Neofax 12th Ed.</publisher><urls></urls></record></Cite></EndNote>(17). 00Suggested IV calcium doses ADDIN EN.CITE <EndNote><Cite><Author>PIPER</Author><RecNum>1014</RecNum><DisplayText>(3)</DisplayText><record><rec-number>1014</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1552280272">1014</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>PIPER </author></authors></contributors><titles><title>Calcium Gluconate</title><secondary-title>PIPER neonatal information guidelines</secondary-title></titles><volume>2019</volume><number>11/3/19</number><dates></dates><urls><related-urls><url>;(3):IV bolus: 10% calcium gluconate solution 0.5 mL/kg (0.11 mmol/kg of calcium ions), give diluted solution slowly over 20-60 minutes.IV infusion: 10% calcium gluconate solution 4.5 mL/kg/day (1 mmol/kg/day of calcium ions), continuous infusion using an infusion pump.Suggested IV calcium doses ADDIN EN.CITE <EndNote><Cite><Author>PIPER</Author><RecNum>1014</RecNum><DisplayText>(3)</DisplayText><record><rec-number>1014</rec-number><foreign-keys><key app="EN" db-id="zd22x0fzzs9v24exasapz05xwwxf0fee5ead" timestamp="1552280272">1014</key></foreign-keys><ref-type name="Web Page">12</ref-type><contributors><authors><author>PIPER </author></authors></contributors><titles><title>Calcium Gluconate</title><secondary-title>PIPER neonatal information guidelines</secondary-title></titles><volume>2019</volume><number>11/3/19</number><dates></dates><urls><related-urls><url>;(3):IV bolus: 10% calcium gluconate solution 0.5 mL/kg (0.11 mmol/kg of calcium ions), give diluted solution slowly over 20-60 minutes.IV infusion: 10% calcium gluconate solution 4.5 mL/kg/day (1 mmol/kg/day of calcium ions), continuous infusion using an infusion pump.(Note: Solution usually given diluted in a 1 to 5 fashion - Add 1 mL of Calcium Gluconate 10% to 4 mL of Glucose 5% or 10% to give a final volume of 5 mL = 0.044 mmol Calcium/mL. Consult: for more information. Also consider replacing magnesium if low.)Discharge can be considered once symptoms of hypocalcaemia has resolved and total serum calcium levels are 2.0 mmol/L on 3 consecutive checks.Low risk patientsAll other patients who remains normocalcaemic and do not meet the “high risk” criteria above can be managed as “low risk” with prophylactic calcium replacement.0189865Suggested prophylactic oral calcium doses:If weight < 30 kg, give elemental calcium 600 mg BID If weight 30-49 kg, give elemental calcium 1200 mg BIDIf weight > 50 kg, give elemental calcium 1200 mg TDS0Suggested prophylactic oral calcium doses:If weight < 30 kg, give elemental calcium 600 mg BID If weight 30-49 kg, give elemental calcium 1200 mg BIDIf weight > 50 kg, give elemental calcium 1200 mg TDSNote: The starting treatment dose for hypocalcaemia is elemental calcium 50-150 mg/kg/day in 2-4 divided doses, up to an adult dose of elemental calcium 1.2g TDS orally. For example, Calcium carbonate 1.5 g (i.e. 1 Caltrate tablet) contains 600 mg of elemental calcium.An as-required (i.e. PRN) calcium and Calcitriol order (dose as per the high risk guideline above) as per the age/weight guidelines should also be charted so that calcitriol is available on the ward should the patient develop symptoms of hypocalcaemia.Calcium levels should be checked again at 12 hours postoperatively. If total serum calcium levels remain > 2.0 mmol/L, then the patient can be discharged home once the surgical team has cleared the patient. Follow upFull recovery from transient PTHC may take up to 6-12 months, and in up to 5% of the cases, hypoparathyroidism may be permanent.For high risk patientsCheck serum calcium levels 2-3 days after discharge. If normal, check serum calcium levels weekly. If calcium remains within normal ranges, halve the Calcitriol or Calcium dose weekly until the patient is off both medications. For low risk patients:Check serum calcium levels weekly. If calcium remains within normal ranges, halve the calcium dose weekly until they reach calcium carbonate 600 mg daily, then cease calcium if serum calcium level is normal 1 week after.For patients who develop hypocalcaemia If the patient develops hypocalcaemia and/or requires calcium and/or calcitriol doses beyond the above suggested guides, ongoing discharge planning should be individualised as per the inpatient endocrinology team. 00Please note: all patients who undergoes total thyroidectomy should also start Thyroxine replacement postoperatively. Please note: all patients who undergoes total thyroidectomy should also start Thyroxine replacement postoperatively. References ADDIN EN.REFLIST 1.Kundel A, Thompson GB, Richards ML, Qiu LX, Cai Y, Schwenk FW, et al. Pediatric endocrine surgery: a 20-year experience at the Mayo Clinic. J Clin Endocrinol Metab. 2014;99(2):399-406. doi: 10.1210/jc.2013-2617. PubMed PMID: 24423286.2.Roh JL, Park CI. Intraoperative parathyroid hormone assay for management of patients undergoing total thyroidectomy. Head Neck. 2006;28(11):990-7. doi: 10.1002/hed.20444. PubMed PMID: 16823862.3.PIPER. Calcium Gluconate [cited 2019 11/3/19]. Available from: AV, Ropelato MG, Ballerini MG, Acha O, Bergada I, de Papendieck LG, et al. Predicting hypocalcemia after thyroidectomy in children. Surgery. 2014;156(1):130-6. doi: 10.1016/j.surg.2014.02.016. PubMed PMID: 24929763.5.Morris LF, Waguespack SG, Warneke CL, Ryu H, Ying AK, Anderson BJ, et al. Long-term follow-up data may help manage patient and parent expectations for pediatric patients undergoing thyroidectomy. Surgery. 2012;152(6):1165-71. doi: 10.1016/j.surg.2012.08.056. PubMed PMID: 23158186.6.Grodski S, Serpell J. Evidence for the role of perioperative PTH measurement after total thyroidectomy as a predictor of hypocalcemia. World J Surg. 2008;32(7):1367-73. doi: 10.1007/s00268-008-9545-5. PubMed PMID: 18340480.7.McHenry CR. "Same-day" thyroid surgery: an analysis of safety, cost savings, and outcome. Am Surg. 1997;63(7):586-9; discussion 9-90. PubMed PMID: 9202531.8.Erbil Y, Bozbora A, Ozbey N, Issever H, Aral F, Ozarmagan S, et al. Predictive value of age and serum parathormone and vitamin d3 levels for postoperative hypocalcemia after total thyroidectomy for nontoxic multinodular goiter. Arch Surg. 2007;142(12):1182-7. doi: 10.1001/archsurg.142.12.1182. PubMed PMID: 18086985.9.Kirkby-Bott J, Markogiannakis H, Skandarajah A, Cowan M, Fleming B, Palazzo F. Preoperative vitamin D deficiency predicts postoperative hypocalcemia after total thyroidectomy. World J Surg. 2011;35(2):324-30. doi: 10.1007/s00268-010-0872-y. PubMed PMID: 21153820.10.Nhan C, Dolev Y, Mijovic T, Rivera JA, Kallai-Sanfacon MA, Mlynarek AM, et al. Vitamin D deficiency and the risk of hypocalcemia following total thyroidectomy. J Otolaryngol Head Neck Surg. 2012;41(6):401-6. PubMed PMID: 23700585.11.Yamashita H, Noguchi S, Murakami T, Uchino S, Watanabe S, Ohshima A, et al. Predictive risk factors for postoperative tetany in female patients with Graves' disease. J Am Coll Surg. 2001;192(4):465-8. PubMed PMID: 11294403.12.Patel NA, Bly RA, Adams S, Carlin K, Parikh SR, Dahl JP, et al. A clinical pathway for the postoperative management of hypocalcemia after pediatric thyroidectomy reduces blood draws. Int J Pediatr Otorhinolaryngol. 2018;105:132-7. Epub 2018/02/16. doi: 10.1016/j.ijporl.2017.12.011. PubMed PMID: 29447801.13.Bellantone R, Lombardi CP, Raffaelli M, Boscherini M, Alesina PF, De Crea C, et al. Is routine supplementation therapy (calcium and vitamin D) useful after total thyroidectomy? Surgery. 2002;132(6):1109-12; discussion 12-3. doi: 10.1067/msy.2002.128617. PubMed PMID: 12490862.14.Chen Y, Masiakos PT, Gaz RD, Hodin RA, Parangi S, Randolph GW, et al. Pediatric thyroidectomy in a high volume thyroid surgery center: Risk factors for postoperative hypocalcemia. J Pediatr Surg. 2015;50(8):1316-9. doi: 10.1016/j.jpedsurg.2014.10.056. PubMed PMID: 25783304.15.Yu YR, Fallon SC, Carpenter JL, Athanassaki I, Brandt ML, Wesson DE, et al. Perioperative determinants of transient hypocalcemia after pediatric total thyroidectomy. J Pediatr Surg. 2017;52(5):684-8. doi: 10.1016/j.jpedsurg.2017.01.011. PubMed PMID: 28189449.16.Markowitz ME, Rosen JF, Smith C, DeLuca HF. 1,25-dihydroxyvitamin D3-treated hypoparathyroidism: 35 patients years in 10 children. J Clin Endocrinol Metab. 1982;55(4):727-33. Epub 1982/10/01. doi: 10.1210/jcem-55-4-727. PubMed PMID: 6896714.17.Young T MO. A Manual of Drugs Used in Neonatal Care: Neofax 12th Ed.; 1999.Figure 1. Pathway for the management of children following total thyroidectomy. Notes:PTH testing with a timely turnover is not available in many centres and is therefore not likely to guide immediate treatment. However, once available, it can guide future management. A PTH of > 2.1 pmol/L in a normocalcaemic patient is reassuring. PTH of < 1.6 pmol/L is associated with higher risk of hypoparathyroidism and requires more intensive monitoring and slower wean of supplements. Clinical discretion should be used for PTH levels between 1.6 to 2.1 pmol/L in a normocalcaemic patient.High risk patients: Parathyroidectomy, parathyroid tissue damage or devascularisation/reimplantation, lymph node or central dissection, hyperthyroidism, young age ( 6 years of age). Calcium dose is elemental calcium 50-150 mg/kg/day in 2 divided doses, up to an adult dose of elemental calcium 1.2g BID orally. As a guide: If weight < 30 kg, give elemental calcium 600 mg BID If weight > 30 kg, give elemental calcium 1200 mg BIDCalcitriol 0.025-0.05 mcg/kg/day should be started postoperatively for high risk patients or hypocalcaemic patients as soon as possible in addition to oral calcium carbonate as detailed above. As a guide:Age 1-5 years: Calcitriol 0.25 mcg BIDAge 6-10 years: Calcitriol 0.5 mcg BIDAge > 10 years and adults: Calcitriol 1 mcg BIDIf patient is hypocalcaemia and unable to tolerate oral treatment, IV calcium correction should be considered. Symptoms of hypocalcaemia includes: muscle spasms or cramps, numbness or tingling periorally or in the extremities, fatigue, tetany, seizures, laryngospasm, arrhythmia (prolonged QRS or QT).CaCalciumPTHParathyroid hormoneDr Jeff KaoDepartment of Endocrinology and DiabetesMarch 2019 ................
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