FREQUENCY OF ATRI-VENTRICULAR BLOCK COMPLICATING …
FREQUENCY OF ATRI-VENTRICULAR BLOCK COMPLICATING ST ELEVATION MYOCARDIAL INFARCTION
J. Nealis, A. Mironov, C. Mitre, A. Budzikowski, J. Kassotis
SUNY Downstate Medical Center, Brooklyn, N.Y. USA
ST segment elevation myocardial infarction (STEMI) can be associated with conduction disturbances including atrioventricular block (AVB). AVB can occur as frequently as in 14% of patients with inferior wall STEMI and is usually associated with increased mortality but these data antedate modern area of catheter-based reperfusion therapy. The aim of this study was to ascertain the frequency of AV conduction disease complicating STEMI in the area of rapid reperfusion with primary percutaneous intervention. We have analyzed retrospectively 223 consecutive patients presenting with STEMI to our institution. 72 (41%) patients had an anterior STEMI, 98(56%) patients had an inferior STEMI and 9(5%) had a lateral STEMI. Most of the patients (87%) were African-American. Mean door-to-balloon time was 77±38 minutes. Only 10 patients (4.4%) required temporary pacing at presentation. Out of the 10 patients, 8 presented with complete AVB. Nearly all of them (7) had an inferior STEMI, and one had a lateral STEMI. No patients with an anterior STEMI had an AVB. Only one patient required permanent pacing. Logistic regression analysis identified female gender and posterior extension of the infarct as predictors for the need of temporary pacing. AV nodal conduction abnormalities were infrequently seen in our STEMI population undergoing reperfusion with PCI. Overwhelming majority of conduction abnormalities resolved without sequelae. Furthermore, the presence of AVB did not seem to be associated, as previously thought, with increased in-hospital mortality. This may be due to faster recovery of flow in the infarct related artery that is achieved with catheter based reperfusion.
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