Prognostic importance of new small Q waves following non-ST-elevation acute coronary syndromes.

Journal Article (Journal Article)

PURPOSE: To investigate the prognostic importance of new small Q waves following an acute coronary syndrome. METHODS: We assessed 6-month mortality in 10501 patients with non-ST-elevation acute coronary syndromes who had survived 30 days and had both admission and 30-day electrocardiograms. Patients were stratified by whether they had no new Q waves (n = 9447), new 30- to 40-ms Q waves (n = 733), or new > or =40-ms Q waves (n = 321). RESULTS: Mortality was higher in patients with 30- to 40-ms Q waves than in those with no new Q waves (3.4% [25/733] vs. 2.4% [227/9447], P = 0.005), and even higher in those with > or =40-ms Q waves (5.3% [17/321], P = 0.002). After adjustment for baseline risk predictors, mortality remained higher in patients with new 30- to 40-ms Q waves (odds ratio [OR] = 1.30; 95% confidence interval [CI]: 0.85 to 1.98; P = 0.23) and those with new > or =40-ms Q waves (OR = 1.87; 95% CI: 1.13 to 3.09; P = 0.01). CONCLUSION: Patients with new small Q waves following a non-ST-elevation acute coronary syndrome are at increased risk of adverse outcomes. These small Q waves should be considered diagnostic of myocardial infarction. Further research should investigate whether even smaller QRS changes are prognostically important.

Full Text

Duke Authors

Cited Authors

  • Alexander, JH; Harrington, RA; Bhapkar, M; Mahaffey, KW; Lincoff, AM; Ohman, EM; Klootwijk, P; Pahlm, O; Henden, B; Deckers, JW; Simoons, ML; Califf, RM; Wagner, GS

Published Date

  • December 1, 2003

Published In

Volume / Issue

  • 115 / 8

Start / End Page

  • 613 - 619

PubMed ID

  • 14656613

International Standard Serial Number (ISSN)

  • 0002-9343

Digital Object Identifier (DOI)

  • 10.1016/j.amjmed.2003.08.007


  • eng

Conference Location

  • United States