Relationship of QRS duration at baseline and changes over 60 min after fibrinolysis to 30-day mortality with different locations of ST elevation myocardial infarction: Results from the hirulog and early reperfusion or occlusion-2 trial

C. K. Wong, W. Gao, R. A H Stewart, J. K. French, P. E G Aylward, H. D. White

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Objective: To discern if the prognostic meaning of QRS prolongation differs according to the location of ST elevation acute myocardial infarction Design: Measuring QRS duration in patients with normal conduction or right bundle branch block Setting: HERO-2 trial with prospective collection of electrocardiograms at randomisation and at 60 min after fibrinolytic therapy Patients: 12 456 patients with normal conduction at both randomisation and 60-min time points and 510 with right bundle branch block (RBBB) at both time points Main outcome measure: 30-day mortality. Results: On the baseline ECG, there was a positive association between QRS duration and 30-day mortality with anterior acute myocardial infarction (AMI) (p<0.0001 for those with normal conduction and = 0.007 for those with RBBB) but not with inferior AMI (p = 0.29 and p = 0.32, respectively). For anterior AMI, with or without RBBB, an increment of 20 ms increase in QRS duration predicted a significant 30-40% relative increase in 30-day mortality both before and after adjusting for clinical and ECG variables including baseline ST elevation and presence of Q waves. The association was not present for inferior AMI. Changes in QRS duration over 60 min after fibrinolytic therapy were uncommon and unrelated to mortality. Conclusion: Baseline QRS duration independently stratifies 30-day mortality in patients with anterior AMI, even when unaccompanied by RBBB, but does not stratify mortality risk in patients with inferior AMI.

LanguageEnglish
Pages276-282
Number of pages7
JournalHeart
Volume95
Issue number4
DOIs
Publication statusPublished - 1 Feb 2009

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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