Doppler tissue imaging for assessing left ventricular diastolic dysfunction in heart transplant rejection

Area of Science:

• Cardiology
• Transplant Medicine
• Echocardiography

Background:

• Heart transplant rejection is a significant clinical challenge.
• Accurate and timely diagnosis of rejection is crucial for patient outcomes.
• Non-invasive methods for assessing rejection are highly desirable.

Purpose of the Study:

• To investigate the relationship between mitral annular motion velocity and left ventricular diastolic flow propagation velocity with histological heart transplant rejection.
• To determine if Doppler tissue imaging can reliably assess the severity of heart transplant rejection.

Main Methods:

• Doppler tissue imaging and echocardiography were performed in 41 heart transplant recipients within one hour of myocardial biopsy.
• Measurements included transmitral and pulmonary vein flow indices, mitral annular motion velocity indices, and left ventricular diastolic flow propagation velocity.
• Histological rejection was graded according to the International Society of Heart and Lung Transplantation (ISHLT) criteria.

Main Results:

• Late diastolic mitral annular motion velocity (A(DTI)) and mitral annular systolic contraction velocity (SC(DTI)) were significantly higher in patients with less severe rejection (ISHLT < IIIA) compared to those with more severe rejection (ISHLT ≥ IIIA).
• A(DTI) < 8.7 cm/s showed 82% sensitivity and 53% specificity in predicting significant heart transplant rejection.
• Early diastolic mitral annular motion velocity (E(DTI)) and flow propagation velocity did not correlate with rejection grade.

Conclusions:

• Doppler tissue imaging of the mitral annulus is a valuable tool for diagnosing heart transplant rejection.
• A high late diastolic mitral annular motion velocity can reliably exclude severe rejection.
• However, a reduced late diastolic mitral annular motion velocity is not specific enough to reliably predict severe rejection.