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Updated: Aug 2, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Prevalence and clinical significance of silent myocardial ischemia

W W Parmley1

  • 1University of California, San Francisco.

Circulation
|December 1, 1989
PubMed

Insights

Silent ischemia, or lack of blood flow in the heart without chest pain, is common in coronary artery disease. This condition, even when silent, increases cardiac risks and indicates a poorer prognosis, especially in high-risk individuals.

Area of Science:

  • Cardiology
  • Ischemic Heart Disease

Background:

  • Silent ischemia frequently accompanies coronary artery disease (CAD).
  • Prevalence estimates suggest 2-4% of middle-aged men have asymptomatic CAD with silent ischemia.
  • In known CAD patients, 34% of positive treadmill tests lack pain.

Purpose of the Study:

  • To highlight the prevalence and significance of silent ischemia in various CAD populations.
  • To underscore that ischemic events carry similar risks whether silent or symptomatic.

Main Methods:

  • Review of existing data and studies on silent ischemia prevalence.
  • Analysis of treadmill testing results in different patient cohorts with CAD.

Main Results:

  • Silent ischemia constitutes 70% of ischemic events in stable angina and 80% in unstable angina.
  • Approximately 20-30% of myocardial infarctions are silent.
  • Silent ischemia post-myocardial infarction (MI) in 5% of survivors signals adverse prognosis.

Conclusions:

  • Silent ischemia is a prevalent finding in coronary artery disease.
  • The presence of ischemia, silent or symptomatic, elevates cardiac risk.
  • Silent ischemia adversely impacts prognosis, particularly in high-risk CAD patients.

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