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Prolonged Tpeak-end and Tpeak-end/QT ratio as predictors of malignant ventricular arrhythmias in the acute phase of ST-segment elevation myocardial infarction: a prospective case-control study.

Abstract：

BACKGROUND:Prolonged Tpeak-end (the interval from the peak of the T wave to the end of the T wave) and Tpeak-end/QT ratio have been shown to be markers of arrhythmogenesis in various cardiac disorders. OBJECTIVES:The purpose of this study was to evaluate the utility of Tpeak-end and Tpeak-end/QT ratio at admission in patients with acute ST-segment elevation myocardial infarction (STEMI) in predicting malignant ventricular arrhythmias. METHODS:The study group included 50 patients presenting with STEMI, in whom Tpeak-end and Tpeak-end/QT ratio were measured at admission; these patients were monitored for arrhythmias with a continuous electrocardiogram in the intensive care unit for 48 hours, and 50 healthy individuals acted as controls. RESULTS:The Tpeak-end (0.11 ± 0.04 seconds vs 0.08 ± 0.006 seconds; P < .0010) and Tpeak-end/QT ratio (0.30 ± 0.06 vs 0.21 ± 0.02; P < .001) were prolonged in patients with STEMI. Three patients with STEMI who sustained ventricular fibrillation (VF) within 24 hours of admission had prolonged corrected QT interval (0.39 ± 0.04 seconds vs 0.46 ± 0.13 seconds; P = .019), Tpeak-end (0.10 ± 0.02 seconds vs 0.20 ± 0.11 seconds; P < .001), and Tpeak-end/QT ratio (0.26 ± 0.05 vs 0.41 ± 0.09; P < .001) as compared with patients with STEMI without VF. Tpeak-end > 0.1 seconds and Tpeak-end/QT ratio > 0.3 predicted VF with a sensitivity of 100%. However, the Tpeak-end/QT ratio had a higher specificity (82.9% for Tpeak-end/QT ratio vs 44.7% for Tpeak-end) and accuracy (84% for Tpeak-end/QT ratio vs 48% for Tpeak-end). CONCLUSION:Tpeak-end and Tpeak-end/QT ratio are prolonged in patients with STEMI compared with healthy individuals, and Tpeak-end > 0.1 and Tpeak-end/QT ratio > 0.3 predict malignant ventricular arrhythmias within 24 hours of STEMI.

journal_name

Heart Rhythm

journal_title

Heart rhythm

authors

Shenthar J,Deora S,Rai M,Nanjappa Manjunath C

doi

10.1016/j.hrthm.2014.11.034

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

484-489

issue

3

eissn

1547-5271

issn

1556-3871

pii

S1547-5271(14)01401-5

journal_volume

12

pub_type

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