Background: Ghrelin has been reported to reduce postoperative weight loss by improving appetite and food intake in patients undergoing upper gastrointestinal surgery.
Objective: We aimed to investigate whether growth hormone induction, another essential effect of ghrelin, may attenuate skeletal muscle loss in patients during postoperative starvation.
Methods: Esophageal cancer patients were randomized to receive a continuous intravenous infusion of high-dose ghrelin (HD; 0.5 µg/kg/h), low-dose ghrelin (LD; 0.25 µg/kg/h), or placebo for 7 days after surgery. During this period, oral feeding was not introduced but the patients received the same parenteral and enteral nutrition. We investigated the effects of ghrelin on body weight, skeletal muscle mass, nutritional status, and hormone levels.
Results: Overall, 73 patients were enrolled in this study. The rate of weight loss on postoperative day (POD) 7 relative to that before surgery was significantly lower in the HD group than in the placebo group (HD vs. placebo: -0.61% vs. 1.8%, p = 0.030). The rate of muscle loss in the erector spinae muscle on POD 7 in the HD and LD groups was significantly lower than that in the placebo group (HD vs. placebo: 2.8% vs. 8.5%, p < 0.001; LD vs. placebo: 4.9% vs. 8.5%, p = 0.028). The levels of growth hormone on PODs 1, 3, and 7, and insulin-like growth factor 1 on PODs 3, 7, and 14 were significantly higher in patients who received ghrelin.
Conclusion: Continuous ghrelin administration could attenuate skeletal muscle loss in esophageal cancer patients during postoperative starvation.
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