Left atrial deformation indices in β-thalassemia major patients

Area of Science:

• Cardiology
• Hematology
• Medical Imaging

Background:

• Atrial cardiomyopathy presents a diagnostic challenge in beta-thalassemia major (β-TM) patients, even with cardiac magnetic resonance (CMR) imaging.
• Novel echocardiographic techniques are being explored to improve diagnostic accuracy for atrial cardiomyopathy in β-TM.

Purpose of the Study:

• To investigate the utility of novel echocardiographic techniques, specifically left atrial strain (LAS), in diagnosing atrial cardiomyopathy in β-TM patients.
• To explore the correlation between left atrial strain parameters, electrocardiography, echocardiography, CMR-derived T2*, and clinical factors like atrial fibrillation and iron overload in β-TM patients.

Main Methods:

• A cross-sectional study included 56 β-TM patients and 30 controls, measuring electrocardiography parameters, echocardiographic indices (LVEF, LVEDD, E/e', LAVI, GLS, LASr, LAScd, LASct), and CMR T2* in patients.
• Statistical analysis compared parameters between patients and controls, and assessed correlations within the patient group.

Main Results:

• Significant differences in PR duration, LVEF, LAVI, E/e', GLS, and left atrial strain were observed between β-TM patients and controls.
• Left atrial strain parameters correlated with PR duration, LAVI, E/e', GLS, and T2* in β-TM patients.
• Impaired left atrial contraction strain (LASct) was associated with atrial fibrillation and myocardial iron overload, and left atrial strain correlated with T2*.

Conclusions:

• Left atrial strain shows clinical utility in the early detection of atrial cardiomyopathy in β-TM.
• Impaired LASct can identify β-TM patients with subclinical atrial fibrillation.
• Left atrial strain may serve as a non-invasive tool for estimating myocardial iron load in β-TM.