AIMS: Approximately 30-49% of heart failure (HF) patients are living with obesity. The recommended body mass index (BMI) for the general population is 18.5-24.9 kg/m. The obesity paradox suggests that HF patients with obesity (HFpwO) have a better prognosis compared to normal BMI. Guideline recommendations on ideal BMI for HFpwO are limited. This systematic review aims to examine the evidence base for intentional weight loss in HFpwO on the following parameters: mortality, hospitalization, symptoms, quality of life (QOL), effects on left ventricular ejection fraction (LVEF) and adverse events.
METHODS AND RESULTS: A total of 22 studies were identified: lifestyle intervention (n = 9), pharmacotherapy (n = 3), bariatric surgery (n = 10). Mortality and hospitalization, symptoms, QOL, and LVEF were reported in 8, 15 and 14 studies, respectively. All studies had moderate to high risk of bias except one randomized controlled trial (RCT) which evaluated semaglutide in HF with preserved ejection fraction (HFpEF) patients. Semaglutide resulted in weight loss with improvement in QOL. Lifestyle intervention led to weight loss, minimal adverse events, and improvement in symptoms in both HF with reduced ejection fraction (HFrEF) and HFpEF patients. In six observational studies, bariatric surgery in HFrEF patients achieved weight loss and improvement in LVEF safely in most patients but some patients developed worsening HF perioperatively.
CONCLUSION: There is a need for high-quality adequately powered RCTs on intentional weight loss in HFpwO with survival and hospitalization outcomes. All forms of weight loss intervention studied in this review were likely to result in significant weight loss, improved symptoms and QOL. Careful monitoring is required due to an increase in certain adverse events. [Correction added on 11 September 2024, after first online publication: The sub-headings 'Aims', 'Methods and results' and 'Conclusion' have been added in this version.].