Changes in basal metabolic rate of laparoscopic sleeve gastrectomy patients

The study aimed at exploring changes in basal metabolic rate (BMR) at postoperative first month by using indirect calorimetry in obese patients who undergone laparoscopic sleeve gastrectomy as a part of obesity treatment at Bariatric Surgery Clinic of American Hospital and Koc University Hospital and comparing measurements to Mifflin-St. Jeor (MSJE) equation which is recommended for overweight and obese individuals in cases where use of indirect calorimetry is impossible. Patients' preoperative and postoperative basal metabolic rates (BMR) were measured with indirect calorimetry. 36.3% of the participants (n=12) were male patients whereas 63.6% of them (n=21) were female patients and mean age was 35.8 years. According to patients' Body Mass Index (BMI) classification, 30.3% of the participants (n=10) were identified as obese (BMI=30-39.9 kg/m²), 51.5% of them (n=17) were morbid obese (BMI=40-50kg/m²) and 18.2% of them (n=6) were super morbid obese (BMI=≥50kg/m²). T test performed showed that patients' preoperative and postoperative basal metabolic rates measured with indirect calorimeter reduced significantly at postoperative first month (p˂0.05). We found a significant correlation between Mifflin-St Jeor Formula and indirect calorimeter in terms of patients' basal metabolic rates measured separately in preoperative and postoperative periods (p˂0.05). Significant correlation was found between patients' excess body weight loss percentages and preoperative-postoperative BMR changes (p˂0.05). In light of these findings, while BMR is being measured, Mifflin-St Jeor Formula can be used if indirect calorimeter is not available and BMR decrease with laparoscopic sleeve gastrectomy. Key Words. Sleeve Gastrectomy, BMI, Indirect Calorimeter, Mifflin-St Jeor.