Mitral annulus velocities by Doppler tissue imaging: practical implications with regard to preload alterations,...

Area of Science:

• Cardiology
• Echocardiography
• Diastolic Function Assessment

Background:

• Diastolic dysfunction is a significant factor in heart failure.
• Pseudonormal left ventricular filling patterns can be challenging to identify.
• Mitral annulus Doppler tissue imaging (DTI) is proposed to overcome preload dependency in diastolic function assessment.

Purpose of the Study:

• To evaluate the practical implications and preload independence of DTI in identifying pseudonormal diastolic filling patterns.
• To assess the diagnostic performance of DTI parameters, specifically early diastolic velocity (Ea), in patients with varying degrees of diastolic dysfunction.

Main Methods:

• Studied 40 patients classified by the Canadian Consensus on Diastolic Function (controls, impaired relaxation, pseudonormal).
• Utilized mitral annulus Doppler tissue imaging (DTI) to measure early diastolic velocity (Ea) and late diastolic velocity (Aa).
• Assessed the reproducibility of DTI parameters and their diagnostic accuracy with and without the Valsalva maneuver.

Main Results:

• Early diastolic velocity (Ea) was the most reproducible DTI parameter.
• Ea alone missed 23% of pseudonormal diastolic filling patterns.
• Sensitivity and specificity for Ea were 81% and 89%, improving to 94% and 89% with the Valsalva maneuver.
• A threshold of approximately 12.5 cm/s for Ea is suggested for identifying diastolic dysfunction.

Conclusions:

• Mitral annulus DTI is not completely preload independent.
• DTI should be interpreted alongside other Doppler parameters and the Valsalva maneuver for accurate diastolic function assessment.
• The findings support a revised threshold for Ea in diagnosing diastolic dysfunction, particularly in pseudonormal patterns.