International Study of Comparative Health Effectiveness with Medical and Invasive Approaches (ISCHEMIA) trial:...

Area of Science:

• Cardiology
• Interventional Cardiology
• Clinical Trials

Background:

• Previous trials on revascularization in stable ischemic heart disease (SIHD) did not demonstrate reduced cardiovascular events.
• These trials often excluded patients with significant ischemia or unknown coronary anatomy.
• The benefit of a routine invasive approach versus a conservative strategy in SIHD with moderate to severe ischemia remains unclear.

Purpose of the Study:

• To compare an initial invasive versus a conservative treatment strategy for SIHD patients with moderate or severe ischemia.
• To evaluate if routine cardiac catheterization and revascularization improve outcomes compared to catheterization only upon failure of optimal medical therapy (OMT).

Main Methods:

• The ISCHEMIA trial randomized 5179 SIHD patients with moderate/severe ischemia.
• Participants received optimal medical therapy (OMT) with lifestyle advice and medications.
• The invasive group underwent routine cardiac catheterization and revascularization (PCI or CABG) as needed.
• The conservative group underwent catheterization only if OMT failed.

Main Results:

• The primary endpoint was a composite of cardiovascular death, nonfatal MI, or hospitalization for unstable angina, heart failure, or cardiac arrest.
• The study aimed to detect an 18.5% reduction in the primary endpoint within 4 years.
• Secondary endpoints included cardiovascular death, nonfatal MI, net clinical benefit, and quality of life.

Conclusions:

• The ISCHEMIA trial provides evidence on the effectiveness of invasive versus conservative strategies in SIHD with moderate to severe ischemia.
• Results will inform clinical decision-making for managing SIHD patients with significant ischemia.