Risk stratification by early exercise testing after an episode of unstable coronary artery disease. The RISC Study...

Area of Science:

• Cardiology
• Clinical Medicine
• Diagnostic Testing

Background:

• Unstable angina and non-Q-wave myocardial infarction require accurate risk stratification for optimal patient management.
• Predischarge assessment is crucial for determining prognosis and guiding subsequent treatment decisions.

Purpose of the Study:

• To evaluate the prognostic value of predischarge exercise testing in men with suspected unstable angina or non-Q-wave myocardial infarction.
• To identify predictors of myocardial infarction, death, and severe angina within one year post-discharge.

Main Methods:

• A cohort of 855 men underwent predischarge exercise testing after symptom stabilization.
• Multiple logistic regression analysis was used to identify independent prognostic factors.
• Patients were categorized into 'high-risk' and 'low-risk' groups based on exercise test responses.

Main Results:

• ST-depression during exercise, low maximal workload, increasing age, and resting ST-elevation independently predicted myocardial infarction or death.
• High-risk exercise responses were associated with significantly higher mortality (3.6% vs. 0%) and risk of myocardial infarction or death (15.4% vs. 3.9%) at 1 year.
• Exercise indicators like ST-depression, angina, and low peak load predicted future severe angina, necessitating coronary angiography in 29.5% of affected patients versus 4.8% in others.

Conclusions:

• The predischarge exercise test is a valuable tool for stratifying risk in patients with acute coronary syndromes.
• Exercise test findings, including ST-depression and workload, accurately predict adverse cardiac events and the need for further invasive procedures.
• The test's predictive power remains robust across different patient subgroups and medication regimens.