Changes of body composition after valve surgery in patients with mitral valve disease

Background Patients with chronic heart failure have alteration in body composition as a reduction in fat mass, lean body mass and bone mass. However, body wasting in valvular heart disease and the impact of corrective valvular surgery on body composition has not been investigated. Objectives We hypothesized that body wasting in severe mitral valve (MV) diseases is reversible through MV surgery. Methods Forty eight patients who were scheduled to undergo MV surgery were consecutively enrolled after excluding patients with combined valvular heart disease, ischemic heart disease, cardiomyopathies, and diseases or who were taking medications that could affect metabolism. All patients were subjected to simplified nutritional assessment questionnaire (SNAQ) for appetite, laboratory tests, echocardiography, and dual-energy X-ray absorptiometry (DXA) before and one year after MV surgery. Results One year after MV surgery, the patients showed increased appetite and improved laboratory data as well as hemodynamic improvement.When we classified the patients according to the primary MV lesion, no changes in body weight were observed in both patients with mitral regurgitation (MR) and mitral stenosis (MS). However, significant increase in bone mineral density and body fat percentage were observed in patients with MR and not in patients with MS. In patients with MR, patients with Δfat ≥ 2% showed significantly higher pre-operative estimated right ventricular systolic pressure (eRVSP) level and greater decrease in eRVSP after surgery than those with Δfat < 2% and both ΔSNAQ and Δfat showed significant negative relationship with ΔeRVSP, respectively. Conclusions In patients with severe MV disease, corrective MV surgery led to favorable outcomes in wasting process as well as hemodynamic improvement. Particularly, right ventricular pressure overload showed a close association with the changes in appetite and body fat percentage in patients with MR.