Predicting postoperative systolic dysfunction in mitral regurgitation: CT vs. echocardiography

Area of Science:

• Cardiology
• Medical Imaging
• Cardiac Surgery

Background:

• Mitral regurgitation can lead to left ventricular systolic dysfunction.
• Optimal timing for mitral valve repair is unclear, with current guidelines relying on 2D echocardiography.
• Early intervention is crucial to prevent irreversible left ventricular dysfunction.

Purpose of the Study:

• To compare the predictive accuracy of volumetric CT-based indices versus 2D echocardiographic indices for post-operative left ventricular systolic dysfunction following mitral repair.
• To determine if CT-based measurements offer superior prediction compared to current echocardiographic standards.

Main Methods:

• Retrospective analysis of 243 patients with primary mitral regurgitation undergoing repair (2005-2021).
• Comparison of preoperative cardiac CT volumetric indices and 2D echocardiographic indices in predicting post-operative LV systolic dysfunction (LVEF <50%).
• Area Under the Curve (AUC) was used to evaluate predictive performance.

Main Results:

• CT-based ejection fraction (LVEF_CT; AUC 0.84) and LV end systolic volume index (LVESVi_CT; AUC 0.88) were superior predictors.
• Echocardiographic predictors included LVEF_echo (AUC 0.70) and LV end systolic diameter (LVESD_echo; AUC 0.79).
• LVEF_CT significantly outperformed LVEF_echo (p=0.02), and LVESVi_CT significantly outperformed LVESD_echo (p=0.03). CT measurements also showed better reproducibility.

Conclusions:

• Volumetric CT measurements may be more effective than 2D echocardiography for predicting left ventricular systolic dysfunction post-mitral valve repair.
• CT-based volumetric analysis offers a potentially more accurate and reproducible method for assessing surgical risk.
• Prospective studies are needed to validate these findings.