Functional imaging after the "ISCHEMIA" trial

Area of Science:

• Cardiology
• Clinical Trials
• Medical Imaging

Background:

• Previous trials like COURAGE and BARI 2D indicated no added benefit of revascularization for stable ischemic heart disease (SIHD) patients.
• The ISCHEMIA trial investigated revascularization versus optimal medical therapy in SIHD patients with moderate-to-severe ischemia.

Purpose of the Study:

• To summarize the findings of the ISCHEMIA trial.
• To highlight the limitations of the ISCHEMIA trial.
• To caution healthcare providers against misinterpreting the trial's implications.

Main Methods:

• Randomized clinical trial comparing revascularization plus optimal medical therapy (OMT) versus OMT alone.
• Inclusion criteria: SIHD patients with moderate-severe ischemia on functional testing and significant coronary stenosis.
• Functional testing included imaging or stress electrocardiogram; stenosis assessed by coronary angiography.

Main Results:

• The ISCHEMIA trial demonstrated no significant difference in outcomes between the revascularization and OMT groups.
• Both strategies yielded similar rates of major adverse cardiovascular events.
• This finding applies to patients with moderate-severe ischemia and significant coronary artery disease.

Conclusions:

• The ISCHEMIA trial provides crucial data for managing stable ischemic heart disease patients.
• The study has sparked debate regarding the role of functional imaging in diagnosis and treatment decisions.
• Careful interpretation is necessary to avoid misapplication of the results in clinical practice.