Left atrial remodelling and function in various left ventricular hypertrophic phenotypes

Area of Science:

• Cardiology
• Cardiac Imaging
• Pathophysiology

Background:

• Left ventricular (LV) hypertrophy's impact on left atrial (LA) remodeling and function is not fully understood.
• Different etiologies of LV hypertrophy may lead to distinct patterns of LA changes.

Purpose of the Study:

• To investigate how various hypertrophic phenotypes influence LA remodeling and function.
• To identify correlations between LA characteristics and underlying LV pathology.

Main Methods:

• Retrospective analysis of cardiac magnetic resonance (CMR) data from 375 individuals.
• Comparison of patients with hypertrophic cardiomyopathy, cardiac amyloidosis, hypertensive heart disease, and aortic stenosis against controls.
• Assessment of LA strain, volume, sphericity, and left atrioventricular coupling index (LACI).

Main Results:

• Cardiac amyloidosis showed significantly larger indexed LA volumes and sphericity, and higher LACI compared to other groups.
• Patients with cardiac amyloidosis had the lowest LA reservoir and booster strain.
• LACI, indexed LA maximal volume, LA sphericity, and LV global longitudinal strain were independently correlated with various LA functional parameters.

Conclusions:

• LA characteristics vary significantly among different LV hypertrophic phenotypes.
• LACI and indexed LA volumes are key independent predictors of overall LA function.
• LA sphericity is an independent correlate of LA reservoir strain.