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

Research output: Contribution to journalArticle

Abstract

PURPOSE: to investigate the prognostic importance of new small Q waves following an acute coronary syndrome. METHODS: We assessed 6-month mortality in 10,501 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 greater than or equal to40-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 greater than or equal to40-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 greater than or equal to40-ms Q waves (OR = 1.87; 95% Cl: 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. (C)2003 by Excerpta Medica Inc.

Details

Authors
  • JH Alexander
  • RA Harrington
  • M Bhapkar
  • KW Mahaffey
  • AM Lincoff
  • EM Ohman
  • P Klootwijk
  • Olle Pahlm
  • B Henden
  • JW Deckers
  • ML Simoons
  • RM Califf
  • GS Wagner
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cardiac and Cardiovascular Systems
  • Respiratory Medicine and Allergy
Original languageEnglish
Pages (from-to)613-619
JournalAmerican Journal of Medicine
Volume115
Issue number8
Publication statusPublished - 2003
Publication categoryResearch
Peer-reviewedYes