Postoperative Reverse Remodeling in Aortic Regurgitation: What One-Year Left Ventricular Mass Regression Tells Us

Chronic severe aortic regurgitation (AR) causes a continuous volume overload of the left ventricle, leading to progressive chamber dilation, eccentric hypertrophy, and eventually myocardial dysfunction if left untreated. Aortic valve surgery removes the hemodynamic burden, but the extent of postoperative reverse remodeling varies substantially among patients. In this issue, Park et al.¹⁾ provide important insights by examining the prognostic implications of one-year left ventricular mass regression after aortic valve surgery in a large cohort of patients with severe AR.

With a cohort of more than 500 patients and a median follow-up exceeding 7 years, the authors show that greater 1-year postoperative left ventricular mass index (LVMi) regression is associated with a reduced incidence of primary endpoint, predominantly fewer heart failure-related hospitalizations. Strengths of the current study include a relatively large patient population, thorough echocardiographic assessment, and hard clinical endpoints. For a disease in which left ventricular (LV) remodeling profoundly affects disease prognosis, this study provides valuable insight that postoperative reverse remodeling is not only a structural change of the LV, but also a meaningful prognostic marker. This study presents important contemporary Korean data on the prognostic trajectory after surgical correction of AR.

However, an important limitation of the current study is the timing of its key predictor. One-year LVMi regression is, by definition, a postoperative measurement. While it is highly informative for long-term follow-up, it cannot guide the most challenging aspect of AR management: preoperative patient selection and timing of aortic valve (AV) surgery. More predictors that can help identity patients who would benefit most from earlier intervention before irreversible myocardial injury occurs are still needed, despite recent advances of medical therapies and surgical techniques.

Recent investigations demonstrated that preoperative global longitudinal strain (GLS) in addition to traditional measurements such as left ventricular ejection fraction (LVEF) and LV size was associated with prognosis in patients with chronic AR undergoing AV surgery.²⁾,³⁾,⁴⁾ Likewise, cardiac magnetic resonance (CMR) imaging has highlighted the role of myocardial fibrosis in predicting postoperative recovery and long-term outcomes as well as providing complementary information in terms of AR quantification and assessment of LV parameters.⁵⁾

While these preoperative markers are meaningful, as they can guide the decision of surgical timing and optimal patient selection, the present study nonetheless offers important contributions in the area in which more sensitive markers to detect patients with severe AR who would benefit most from earlier intervention are still waiting to be found. The identification of hypertension as a negative factor for LVMi regression is particularly noteworthy. Although hypertension is a common comorbidity in patients with severe AR, it is often under-recognized in its influence on reverse remodeling of LV. The finding that patients with hypertension exhibited smaller postoperative LVMi regression suggests that myocardial reserve and capacity of reverse remodeling are influenced not only by valvular pathology, but also by metabolic and vascular condition. This underscores the importance of management of comorbidities and perioperative optimization of medical treatment.

Taken together, this study brings the prognostic significance of postoperative LV reverse remodeling while reminding us of the broader spectrum of AR management. Preoperative markers including LV end-systolic dimension, LVEF, GLS and myocardial fibrosis in CMR guide physicians to decide timing of AV surgery and patient selection, whereas postoperative remodeling indices such as LVMi regression help physicians understand the long-term prognosis of patients who had undergone AV surgery. Future research including prospective randomized trials are welcomed to integrate these 2 aspects—preoperative myocardial characterization and risk factors, and postoperative response of LV remodeling—to improve more comprehensive risk stratification for patients with chronic AR.

The current study brings meaningful Korean data to the global understanding of remodeling process in AR and emphasizes the importance of comorbidity management. Their findings could deepen our understanding of the complex interplay between comorbidities, myocardial biology, AV surgery, and long-term outcomes. This study by Park et al.¹⁾ presents a useful insight for future studies exploring the complex spectrum of LV remodeling in patients with chronic AR.