Hemodynamic Effects of Weight Loss in Obesity: A Systematic Review and Meta-Analysis.

OBJECTIVES: The authors aimed to explore whether weight loss may improve central hemodynamics in obesity.
BACKGROUND: Hemodynamic abnormalities in obese heart failure with preserved ejection fraction patients are correlated with the amount of excess body mass, suggesting a possible causal relationship.
METHODS: Relevant databases were systematically searched from inception to May 2018, without language restriction. Studies reporting invasive hemodynamic measures before and following therapeutic weight loss interventions in patients with obesity but no clinically overt heart failure were extracted.
RESULTS: A total of 9 studies were identified, providing data for 110 patients. Six studies tested dietary intervention and 3 studies tested bariatric surgery. Over a median duration of 9.7 months (range 0.75 to 23.0 months), a median weight loss of 43 kg (range 10 to 58 kg) was associated with significant reductions in heart rate (-9 beats/min, 95% confidence interval [CI]: -12 to -6; p < 0.001), mean arterial pressure (-7 mm Hg, 95% CI: -11 to -3; p < 0.001), and resting oxygen consumption (-85 ml/min, 95% CI: -111 to -60; p < 0.001). Central cardiac hemodynamics improved, manifested by reductions in pulmonary capillary wedge pressure (-3 mm Hg, 95% CI: -5 to -1; p < 0.001) and mean pulmonary artery pressure (-5 mm Hg, 95% CI: -8 to -2; p = 0.001). Exercise hemodynamics were assessed in a subset of patients (n = 49) in which there was significant reduction in exercise pulmonary artery pressure (p = 0.02).
CONCLUSIONS: Therapeutic weight loss in obese patients without HF is associated with favorable hemodynamic effects. Randomized controlled trials evaluating strategies for weight loss in obese patients with heart failure such as the obese phenotype of heart failure with preserved ejection fraction are needed.