The relation between pro-oxidant antioxidant balance and glycolipid profile, 6 months after gastric bypass surgery.

Background: Morbid obesity is a chronic disease that contributes to increased oxidative stress. Gastric bypass surgery is the gold standard method in treating co-morbidities.

Objectives: The objective of this study was to evaluate the relation between pro-oxidant antioxidant balance (PAB) as one measure of oxidative stress and glycolipid profile 6 months after gastric bypass surgery.

Setting: Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.

Methods: Thirty-five morbidly obese patients with body mass index ≥35 kg/m with co-morbidities or ≤40 kg/m were randomly recruited. The PAB assay was used to estimate oxidative stress. Anthropometrics and glycolipid profile were collected at recruitment and 6 months after surgery. Statistical analysis was performed using SPSS 16 software.

Results: The study showed a significant postoperative reduction in serum PAB values compared with the baseline (P<.001). All anthropometric and several glycolipid parameters significantly reduced after surgery (P<.001), while serum high-density lipoprotein cholesterol was unaffected. Repeated measures analysis of variance showed that postoperative PAB values were affected by gastric bypass surgery (F = 12.51, P = .001). Regression analysis demonstrated medication usage controlling co-morbidities (β^ = -.6, P = .002) and fasting blood glucose (β^ = .41, P = .04) as independent factors in predicting PAB values 6 months after surgery.

Conclusions: Gastric bypass surgery can reduce PAB values in favor of antioxidants 6 months after the operation. Accordingly, fasting blood glucose after gastric bypass surgery can be an independent factor in predicting PAB values.