Does Left Atrial Size and E/e' Predict Outcomes in Hypertrophic Cardiomyopathy?

Area of Science:

• Cardiology
• Cardiac Imaging
• Hypertrophic Cardiomyopathy

Background:

• Atrial arrhythmia is common and detrimental in hypertrophic cardiomyopathy (HCM) patients.
• Catheter ablation (CA) has limited success in HCM, necessitating outcome predictors.
• Left atrial size and E/e' are potential prognostic markers.

Purpose of the Study:

• To assess if left atrial size (LAD, LAVi) and E/e' predict non-paroxysmal atrial arrhythmia, atrial interventions, and all-cause mortality in HCM.
• To compare the predictive power of different left atrial size measurements.

Main Methods:

• Retrospective analysis of 233 HCM patients from an echocardiography database.
• Survival analysis for left atrial diameter (LAD), left atrial volume index (LAVi), and E/e' against endpoints.
• ROC analysis to compare discriminative power of LAD and LAVi.

Main Results:

• 31% prevalence of non-paroxysmal atrial arrhythmia over 8 years.
• LAVi predicted non-paroxysmal atrial arrhythmia and atrial interventions; LAD predicted arrhythmia only.
• LAVi showed superior discriminative power for atrial interventions; E/e' and echocardiographic variables did not predict mortality.

Conclusions:

• Left atrial volume index (LAVi) may offer greater clinical utility than 2D measurements like LAD for predicting outcomes in HCM.
• Further research is needed to determine optimal left atrial size measures for clinical practice.