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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

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Asymptomatic ST-segment depression during exercise testing and the risk of sudden cardiac death in middle-aged men: a

Jari A Laukkanen1, Timo H Mäkikallio, Rainer Rauramaa

  • 1Research Institute of Public Health, University of Kuopio, Kuopio, Finland. jariantero.laukkanen@uku.fi

European Heart Journal
|January 27, 2009
PubMed

Insights

Asymptomatic ST-segment depression during exercise or recovery predicts sudden cardiac death in men without coronary heart disease. This finding highlights the importance of exercise testing for identifying high-risk individuals for preventive measures.

Area of Science:

  • Cardiology
  • Preventive Medicine
  • Exercise Physiology

Background:

  • Silent electrocardiographic ST changes predict coronary events in patients with coronary heart disease (CHD).
  • The prognostic value of asymptomatic ST-segment depression for sudden cardiac death (SCD) in individuals without apparent CHD is not well understood.

Purpose of the Study:

  • To investigate the association between asymptomatic ST-segment depression during and after maximal exercise testing and the risk of SCD.
  • To determine the predictive significance of silent ST changes in men without diagnosed CHD.

Main Methods:

  • A population-based sample of 1769 men without evident CHD was studied.
  • Exercise tests were performed to assess ST-segment changes during and after maximal symptom-limited exercise.
  • Median follow-up was 18 years, during which 72 SCD events occurred.

Main Results:

  • Asymptomatic ST-segment depression during exercise increased SCD risk (HR 2.1, 95% CI 1.2-3.9).
  • Asymptomatic ST-segment depression during recovery also significantly increased SCD risk (HR 3.2, 95% CI 1.7-6.0).
  • The predictive value was stronger in smokers, hypercholesterolemic, and hypertensive men.

Conclusions:

  • Asymptomatic ST-segment depression is a potent predictor of SCD in men with conventional risk factors but no prior CHD diagnosis.
  • Exercise testing is valuable for identifying asymptomatic high-risk individuals who may benefit from preventive interventions.
Abstract

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