Prognostic value of a normal exercise echocardiogram.

Area of Science:

• Cardiology
• Diagnostic Imaging
• Preventive Cardiology

Background:

• Exercise echocardiography is a key tool for diagnosing coronary artery disease (CAD).
• The prognostic implications of a normal exercise echocardiogram, particularly in conjunction with exercise electrocardiogram (ECG) findings, require further elucidation.
• Understanding long-term outcomes is crucial for patient management and risk stratification.

Purpose of the Study:

• To assess the prognostic value of a normal exercise echocardiogram in patients with suspected coronary artery disease.
• To determine the incidence of cardiac events and need for revascularization following a normal exercise echocardiogram.
• To evaluate if exercise capacity influences prognosis despite a normal echocardiogram.

Main Methods:

• Follow-up of 148 patients with normal resting and exercise echocardiograms.
• Evaluation of exercise ECG results, exercise capacity (METs, heart rate), and cardiac events over a mean of 28.4 months.
• Analysis of major adverse cardiac events including myocardial infarction, death, and coronary revascularization.

Main Results:

• Cardiac events were infrequent (6 of 148 patients), occurring primarily in those with limited exercise capacity (<6 METs or <85% predicted heart rate).
• Coronary revascularization was rarely needed within 28 months post-echocardiography.
• No deaths occurred; myocardial infarctions were rare (0.85% per year).

Conclusions:

• A normal exercise echocardiogram is associated with an excellent long-term prognosis for patients evaluated for coronary artery disease.
• Good exercise capacity further strengthens the favorable prognosis, even if the exercise ECG is abnormal.
• Myocardial infarction and death are uncommon outcomes, irrespective of exercise capacity, following a normal exercise echocardiogram.