Constipation by WEXNER Score in Patients with Morbid Obesity after Gastric Bypass Surgery

In this study, we aimed to evaluate the effect of bariatric surgery on constipation followed by the surgery.This prospective cohort study included 237 patients with morbid obesity, who were candidate for Laparoscopic Roux-en-Y Gastric Bypass (RYGB), and One-Anastomosis Gastric Bypass (OAGB) in Obesiyt Clinic of Rasoul Akram Hospital, Tehran, Iran, 2012-2014. The severity of constipation was measured by Wexner Constipation Score (WCS) before and three months after the surgery. Paired t-test, Mc Nemar test, and logistic regression were applied for the analyses. Mean age and BMI of the 237 patients were 31.59±5.92 years and46.59±5.81kg/m2, respectively. Mean WCS decreased significantly in OAGB group (3.1±4.27 vs. 4.72±4.81, P=0.003), while the reduction in WCS mean score was not significant in RYGB group (4.5±4.73 vs. 4.63±5.19, P=0.793). The proportion of constipation reduced (48/103 vs. 32/103) significantly in OAGB group (P=0.002). Conversely, the decrease in this proportion (from 58/134 to 57/134) was not significant in RYGB group (P=0.06). Considering the confounding role of diet and supplementary intake of the patients, the results of this study showed that the frequency of constipation reduced in morbidly obese patients undergoing obesity surgery and postoperative nutritional recommendations. The comparison between techniques showed that OAGB reduced the constipation score and proportion, while this decrease was not significant in RYGB.