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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

Silent myocardial ischemia in patients with coronary artery disease. Possible links with diastolic left ventricular

J J Mahmarian1, C M Pratt

  • 1Department of Internal Medicine, Baylor College of Medicine, Houston, Texas.

Circulation
|February 1, 1990
PubMed

Insights

Silent myocardial ischemia, often undetected, is common in coronary artery disease. Evidence of this silent ischemia increases cardiovascular risk and impairs heart function, affecting both systolic and diastolic performance.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Diagnostic Imaging

Background:

  • Silent myocardial ischemia is a prevalent manifestation of coronary artery disease (CAD).
  • It carries significant physiological, hemodynamic, and prognostic implications.
  • Asymptomatic ST segment shifts are more common than symptomatic ones and indicate abnormal myocardial perfusion.

Purpose of the Study:

  • To highlight the prevalence and clinical significance of silent myocardial ischemia.
  • To examine the impact of ischemia on left ventricular systolic and diastolic function.
  • To assess the reversibility of diastolic dysfunction after revascularization.

Main Methods:

  • Ambulatory 24-hour electrocardiographic monitoring.
  • Exercise treadmill testing.
  • Radionuclide scintigraphy for myocardial perfusion assessment.
  • Hemodynamic studies during atrial pacing and dynamic exercise.

Main Results:

  • Asymptomatic ST shifts are frequent and linked to abnormal myocardial perfusion.
  • Silent ischemia is associated with increased cardiovascular morbidity risk in various CAD patient groups.
  • Ischemia adversely affects left ventricular systolic function.
  • Diastolic relaxation and filling are impaired by both symptomatic and asymptomatic ischemia.
  • Abnormal diastolic parameters are common at rest in CAD patients and partially reversible post-revascularization.
  • Diastolic function appears more susceptible to ischemia than systolic function.

Conclusions:

  • Silent myocardial ischemia is a critical indicator of cardiovascular risk in CAD.
  • Both systolic and diastolic cardiac functions are compromised by ischemia.
  • Diastolic dysfunction is prevalent, potentially more sensitive to ischemia, and may improve after revascularization procedures.

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