Prediction of Ischemic Events by Anatomic M-mode Strain Rate Stress Echocardiography

Ronald Mastouri, Jothiharan Mahenthiran, Masoor Kamalesh, Irmina Gradus-Pizlo, Harvey Feigenbaum, Stephen G. Sawada

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Objective: We assessed the prognostic value of anatomic M-mode strain rate stress echocardiography (SRSE) in patients with known or suspected coronary artery disease. Previous studies showing that M-mode SRSE may be an accurate method for detection of coronary artery disease suggest that this technique may be useful for risk stratification. Methods: M-mode SRSE, using a color-coded display of strain rate (SR), was performed in 358 patients (48, dobutamine; 68, bicycle; 242, treadmill). SR was graded by visual assessment of the color-coded display in 12 apical segments. Abnormal rest SR was defined as SR more positive than -1/s (green-yellow). Ischemia was defined by the development of post-systolic shortening or lack of improvement of SR to more negative than -2/s (brown hue) with stress. Patients were followed for cardiac events. Results: Twelve patients with early intervention for an abnormal two-dimensional stress echocardiogram or stress electrocardiogram were excluded. Follow-up (mean 10.7 months) was completed in 98% (338/346) of the remaining patients. Events occurred in 1.7% (4/230) of patients with normal SRSE compared with 10% (11/108) with abnormal SRSE (P = .002). The annualized hard event (infarction, death) rate in those with normal SRSE was 0.5% versus 7.2% in those with abnormal SRSE (P = .001). Smoking (P = .048, relative risk 2.91), nitrate use (P = .001, relative risk 7.81), and the severity of the abnormality on SRSE (P = .009, relative risk 1.75) independently predicted events. Wall motion assessment was not predictive. Patients with normal SRSE had better event-free survival compared with those with abnormal SRSE (P < .001). Conclusion: SRSE is an independent predictor of outcome. A normal SRSE predicts a low risk of infarction or death in short-term follow-up.

Original languageEnglish (US)
Pages (from-to)299-306
Number of pages8
JournalJournal of the American Society of Echocardiography
Volume21
Issue number4
DOIs
StatePublished - Apr 1 2008

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Keywords

  • M-mode
  • Strain rate
  • Stress echocardiography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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