Anatomic and prognostic implications of an early positive treadmill exercise test

Area of Science:

• Cardiology
• Diagnostic Imaging
• Preventive Medicine

Background:

• Clinical coronary artery disease diagnosis often relies on symptoms and prior treatments.
• Treadmill exercise testing is a common tool for assessing cardiac function.
• Left main coronary artery stenosis is a critical condition requiring timely diagnosis.

Purpose of the Study:

• To investigate the correlation between early positive treadmill exercise tests and the prevalence of left main coronary artery stenosis.
• To evaluate the diagnostic utility of treadmill testing in identifying significant coronary artery disease, including left main stenosis.
• To determine the appropriate role of coronary angiography in patients with positive treadmill tests.

Main Methods:

• Coronary angiography was performed on two groups of men with clinical coronary artery disease and positive treadmill tests (Groups A and B).
• A control group of catheterized patients with non-early positive treadmill tests was also analyzed.
• Prevalence of left main coronary artery stenosis (≥50% diameter) and multi-vessel coronary artery disease (≥75% stenosis) was compared.

Main Results:

• Left main coronary artery stenosis was found in 28% of Group A and 35% of Group B, significantly higher than the 10% in patients with non-early positive tests (p<0.001).
• In patients without significant left main stenosis, 85% had multi-vessel disease (≥75% stenosis).
• Medical management in this subgroup yielded a 36-month survival rate of 89.2%.

Conclusions:

• An early positive treadmill test is a strong indicator of potential left main coronary artery stenosis, irrespective of symptom severity.
• Coronary angiography is justified in patients with early positive treadmill responses, even with mild or undertreated angina.
• Excluding left main stenosis allows for effective medical management with favorable long-term survival.