Determinants of Atrial Electromechanical Delay in Patients with Functional Mitral Regurgitation and Non-ischemic...

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Imaging

Background:

• Atrial conduction time impacts ventricular filling and predicts atrial fibrillation.
• Non-ischemic dilated cardiomyopathy (NIDCMP) with mitral regurgitation (MR) presents unique challenges in assessing cardiac function.
• Understanding atrial conduction abnormalities is crucial for managing these complex cardiac conditions.

Purpose of the Study:

• To assess atrial conduction time in NIDCMP patients with functional MR.
• To identify factors predicting atrial conduction time prolongation in this cohort.
• To explore the relationship between atrial electromechanical delay and cardiac remodeling.

Main Methods:

• Sixty-five NIDCMP patients with moderate-to-severe MR and 60 controls underwent echocardiography.
• Atrial electromechanical coupling (PA interval) and intra-/interatrial electromechanical delay (AEMD) were measured using tissue Doppler echocardiography.
• Conventional echocardiographic parameters of left ventricle and MR were also assessed.

Main Results:

• Inter- and intra-atrial electromechanical delay showed poor correlation with left atrial size, MR volume, and relaxation times.
• However, both inter- and intra-AEMD demonstrated a strong correlation with left ventricular mass index, tenting area, tenting distance, coaptation septal distance, and sphericity index.
• These findings suggest a link between atrial conduction abnormalities and structural changes in the ventricle and mitral annulus.

Conclusions:

• Prolongation of inter- and intra-atrial electromechanical delays is significantly associated with left ventricular and mitral annular remodeling.
• These delays may serve as indicators of structural changes in NIDCMP patients with MR.
• Further research can elucidate the clinical implications of these correlations for patient management.