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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Prevalence of silent myocardial ischaemia during exercise stress testing. Its relation to effort tolerance and

G Fragasso1, M G Sciammarella, E E Rossetti

  • 1Division of Cardiology, Istituto Scientifico Ospedale San Raffaele, Milano, Italy.

European Heart Journal
|July 1, 1992
PubMed

Insights

Silent myocardial ischemia during exercise is common in coronary artery disease patients. Angina is linked to larger ischemic areas and reduced coronary flow reserve, not old heart attacks.

Area of Science:

  • Cardiology
  • Nuclear Cardiology
  • Exercise Physiology

Background:

  • Coronary artery disease (CAD) can manifest as symptomatic angina or silent myocardial ischemia.
  • Exercise testing is crucial for diagnosing and assessing CAD severity.

Purpose of the Study:

  • To compare myocardial perfusion, coronary artery disease extent, and coronary flow reserve in patients with painful versus painless ischemic ST depression during exercise.
  • To investigate factors influencing the presence or absence of chest pain during exercise-induced ischemia.

Main Methods:

  • 147 consecutive patients with ischemic ST depression on exercise testing were analyzed.
  • Coronary artery disease extent, perfusion defects (99mTc-MIBI scintigraphy), and coronary flow reserve were assessed.
  • Patients were divided into two groups: those with angina (group 1) and those without (group 2).

Main Results:

  • Coronary disease extent and distribution were similar between groups.
  • Patients with angina had lower exercise duration, time, and rate-pressure product at ischemia onset.
  • Asymptomatic patients were more likely to have a single ischemic segment on perfusion scintigraphy.
  • Old myocardial infarction did not influence the presence or absence of ischemic pain.

Conclusions:

  • Silent ischemic events during exercise are as common as previously reported.
  • Exertional angina is associated with larger ischemic areas and more impaired coronary flow reserve.
  • Previous myocardial infarction does not affect the occurrence of ischemic cardiac pain.

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