Which imaging modality is used to diagnose restrictive cardiomyopathy?

Which imaging modality is used to diagnose restrictive cardiomyopathy?

• A. Echocardiography
• B. Chest X-ray
• C. Cardiac MRI
• D. CT

Answer: (A)

Assessing how the ventricles fill and relax is essential for recognizing restrictive cardiomyopathy. Echocardiography provides the most informative, real-time view of diastolic function and filling pressures, making it the best tool to diagnose this condition. On an echo, you’d typically see preserved systolic function with a normal or near-normal ejection fraction, but evidence of diastolic dysfunction. The atria are often enlarged from chronically elevated filling pressures. The diastolic filling pattern shows a restrictive profile: high early transmitral flow velocity (a large E wave) with a rapid decline (short deceleration time), and tissue Doppler measuring reduced early diastolic velocity (e') at the mitral annulus. The combination of a high E velocity, short deceleration time, reduced e' velocity, and an elevated E/e' ratio points to elevated left-sided filling pressures and noncompliant ventricles typical of restrictive physiology. Other imaging modalities can provide complementary information—chest X-ray may show atrial enlargement but lacks diastolic detail; cardiac MRI can characterize tissue (such as amyloid or fibrosis) and help define etiology; CT is less useful for assessing diastolic function. But for diagnosing the diastolic dysfunction underlying restrictive cardiomyopathy, echocardiography is the primary, most informative test.

Assessing how the ventricles fill and relax is essential for recognizing restrictive cardiomyopathy. Echocardiography provides the most informative, real-time view of diastolic function and filling pressures, making it the best tool to diagnose this condition.

On an echo, you’d typically see preserved systolic function with a normal or near-normal ejection fraction, but evidence of diastolic dysfunction. The atria are often enlarged from chronically elevated filling pressures. The diastolic filling pattern shows a restrictive profile: high early transmitral flow velocity (a large E wave) with a rapid decline (short deceleration time), and tissue Doppler measuring reduced early diastolic velocity (e') at the mitral annulus. The combination of a high E velocity, short deceleration time, reduced e' velocity, and an elevated E/e' ratio points to elevated left-sided filling pressures and noncompliant ventricles typical of restrictive physiology.

Other imaging modalities can provide complementary information—chest X-ray may show atrial enlargement but lacks diastolic detail; cardiac MRI can characterize tissue (such as amyloid or fibrosis) and help define etiology; CT is less useful for assessing diastolic function. But for diagnosing the diastolic dysfunction underlying restrictive cardiomyopathy, echocardiography is the primary, most informative test.