Cardiac imaging after ischemic stroke : Echocardiography, CT, or MRI?

Area of Science:

• Cardiology
• Neurology
• Medical Imaging

Background:

• Approximately 20-25% of ischemic strokes are cardioembolic.
• Atrial fibrillation and heart failure are the most frequent causes.
• Noninvasive cardiac imaging is crucial for guiding stroke prevention therapy.

Purpose of the Study:

• To evaluate the role of noninvasive cardiac imaging in diagnosing cardioembolic stroke.
• To determine the effectiveness of echocardiography and other imaging modalities in managing stroke patients.

Main Methods:

• Review of diagnostic work-up for ischemic stroke.
• Focus on echocardiography (transthoracic and transesophageal) as a primary tool.
• Assessment of cardiac computed tomography and magnetic resonance imaging as complementary methods.

Main Results:

• Echocardiography, particularly transesophageal echocardiography, is highly sensitive for detecting cardioembolic sources.
• Transesophageal echocardiography is recommended for initial diagnosis when a cardioembolic source is suspected.
• Currently, no proven benefit of transesophageal echocardiography-guided therapy changes on major stroke outcomes exists.
• Cardiac CT and MRI offer complementary information but are not recommended as first-line investigations.

Conclusions:

• Echocardiography remains the cornerstone for cardiac imaging post-stroke.
• Transesophageal echocardiography should be considered early for suspected cardioembolic sources.
• Cardiac CT and MRI serve as valuable adjuncts in specific clinical scenarios.