Vitamin concentrations 5 years after gastric bypass.

BACKGROUND/OBJECTIVES: Few studies have investigated the effects of bariatric surgery on vitamin status in the long term. We examined changes in vitamin status up to 5 years after Roux-en-Y gastric bypass surgery. SUBJECTS/METHODS: Using a retrospectively maintained database of patients undergoing weight loss surgery, we identified all patients operated with Roux-en-Y gastric bypass at our tertiary care hospital during July 2004-May 2008. Data on vitamin concentrations and patient-reported intake of dietary supplements were collected up to July 2012. Linear mixed models were used to estimate changes in vitamin concentrations during follow-up, adjusting for age and sex. All patients were recommended daily oral multivitamin, calcium/vitamin D and iron supplements and 3-monthly intramuscular B-12 after surgery. RESULTS: Out of the 443 patients operated with gastric bypass, we included 441 (99.5%) patients with one or more measurements of vitamin concentrations (75.1% women; mean age 41.5 years, mean body mass index 46.1 kg/m(2) at baseline). At 5 years after surgery, the patients' estimated mean vitamin concentrations were either significantly higher (vitamin B-6, folic acid, vitamin B-12, vitamin C and vitamin A) or not significantly different (thiamine, 25-hydroxyvitamin D and lipid-adjusted vitamin E) compared with before surgery. Use of multivitamin, calcium/vitamin D and vitamin B-12 supplements was reported by 1-9% of patients before surgery, 79-84% of patients at 1 year and 52-83% of patients 5 years after surgery. CONCLUSIONS: In patients who underwent gastric bypass surgery, estimated vitamin concentrations were either significantly increased or unchanged up to 5 years after surgery.

Impact of gender on vitamin D deficiency in morbidly obese patients: a cross-sectional study.

BACKGROUND/OBJECTIVE: Obesity is associated with vitamin D deficiency (25-hydroxyvitamin D (25(OH)D) <50 nmol/l). We aimed to examine the effect of gender on vitamin D status in severe obesity. SUBJECTS/METHODS: Cross-sectional study of 2026 morbidly obese patients examined consecutively at a tertiary care centre between November 2005 and June 2010. Serum 25(OH)D concentration and use of vitamin D supplements were registered in all patients. Total vitamin D intake (µg/day) was assessed in a subgroup of 154 patients using a validated food frequency questionnaire. RESULTS: The male (n=690) and female (n=1336) patients had a mean (s.d.) age of 45.0 (12.1) years and 42.2 (12.2) years (P<0.001), body mass index (BMI) of 44.6 (6.0) kg/m(2) and 44.3 (5.9) kg/m(2) (P=0.30) and waist circumference (WC) of 140 (13) cm and 127 (13) cm (P<0.001), respectively. Male patients had significantly lower mean 25(OH)D concentrations than female patients 50.0 (22.0) nmol/l versus 53.6 (22.4) nmol/l (P=0.001) and a higher rate of vitamin D deficiency (56% versus 47%; P<0.001). Obese men had significantly higher odds of vitamin D deficiency than women (odds ratio=1.41; 95% confidence interval: 1.17-1.70, P<0.001), also after adjustment for season, age, current smoking, intake of vitamin D supplements, BMI and WC (odds ratio=1.39; 95% confidence interval: 1.10-1.76). CONCLUSIONS: Morbidly obese Norwegian men seeking weight loss treatment have significantly higher odds of vitamin D deficiency than women. Monitoring of 25(OH)D concentrations in obese patients should therefore take gender into account.

Effect of the definition of type II diabetes remission in the evaluation of bariatric surgery for metabolic disorders.

BACKGROUND: The American Diabetes Association recently defined remission of type II diabetes as a return to normal measures of glucose metabolism (haemoglobin (Hb) A1c below 6 per cent, fasting glucose less than 5·6 mmol/l) at least 1 year after bariatric surgery without hypoglycaemic medication. A previously used common definition was: being off diabetes medication with normal fasting blood glucose level or HbA1c below 6 per cent. This study evaluated the proportion of patients achieving complete remission of type II diabetes following bariatric surgery according to these definitions. METHODS: This was a retrospective review of data collected prospectively in three bariatric centres on patients undergoing gastric bypass, sleeve gastrectomy and gastric banding. RESULTS: Some 1006 patients underwent surgery, of whom 209 had type II diabetes. Median follow-up was 23 (range 12-75) months. HbA1c was reduced after operation in all three surgical groups (P < 0·001). A total of 72 (34·4 per cent) of 209 patients had complete remission of diabetes, according to the new definition; the remission rates were 40·6 per cent (65 of 160) after gastric bypass, 26 per cent (5 of 19) after sleeve gastrectomy and 7 per cent (2 of 30) after gastric banding (P < 0·001 between groups). The remission rate for gastric bypass was significantly lower with the new definition than with the previously used definition (40·6 versus 57·5 per cent; P = 0·003). CONCLUSION: Expectations of patients and clinicians may have to be adjusted as regards remission of type II diabetes after bariatric surgery. Focusing on improved glycaemic control rather than remission may better reflect the benefit of this type of surgery and facilitate improved glycaemic control after surgery.

Assessment of obesity beyond body mass index to determine benefit of treatment.

WHAT IS ALREADY KNOWN ABOUT THIS SUBJECT: • Weight or weight loss per se may not indicate health status or health benefit. • There is no gold standard for assessing which patients would benefit most from weight-loss interventions. • The King's Criteria is one of several recently proposed obesity classification systems. WHAT THIS STUDY ADDS: • The King's Criteria can capture health problems related to obesity and health benefits after weight loss. • The King's Criteria is a reproducible scoring system. • Using the King's Criteria may help shift the focus of patients and clinicians from weight loss to health gain. SUMMARY: Body mass index (BMI) alone does not reflect health status in individuals. The King's Obesity Staging Criteria is a clinical tool for the assessment of patients with complex obesity. We assessed the performance of a modified version of the King's Criteria by scoring 144 obese patients before and 1 year after bariatric surgery. We also evaluated inter-observer variability by having 11 clinicians score the same 12 patients. The King's Obesity Staging Criteria comprise nine health domains: Airways, Body mass index, Cardiovascular disease, Diabetes, Economic complications, Functional limitations, Gonadal axis, Health status (perceived), and body Image. For each domain, a person's health is assigned a score of 0 ('normal health'), 1 ('at risk'), 2 ('established disease') or 3 ('advanced disease'). The patient's mean BMI decreased from 48 ± 7 to 37 ± 7 kg m(-2) post surgery. Before surgery, 84% of patients were either in stage 2 ('established disease') or stage 3 ('advanced disease') for one or more domains other than BMI. The modified King's Criteria showed significant health improvements after surgery, with a higher proportion of patients scored in stage 0 ('normal health') within each health domain (P < 0.001 for all). Observers assigned the same score in >75% of cases for all domains except Health status perceived (71%) and body Image (65%). In conclusion the King's Criteria captured morbidity in obese patients and health gains after weight loss. Different clinicians mostly assigned similar scores. The King's Criteria is a clinical tool that may help shift the focus of patients and clinicians towards improving health and not only losing weight. REGISTRATION NUMBER: NCT01112228 (http://www.clinicaltrials.gov).

Randomized clinical trial of laparoscopic gastric bypass versus laparoscopic duodenal switch for superobesity.

BACKGROUND: Laparoscopic Roux-en-Y gastric bypass (LRYGB) and laparoscopic biliopancreatic diversion with duodenal switch (LDS) are surgical options for superobesity. A randomized trial was conducted to evaluate perioperative (30-day) safety and 1-year results. METHODS: Sixty patients with a body mass index (BMI) of 50-60 kg/m(2) were randomized to LRYGB or LDS. BMI, percentage of excess BMI lost, complications and readmissions were compared between groups. RESULTS: Patient characteristics were similar in the two groups. Mean operating time was 91 min for LRYGB and 206 min for LDS (P < 0.001). One LDS was converted to open surgery. Early complications occurred in four patients undergoing LRYGB and seven having LDS (P = 0.327), with no deaths. Median stay was 2 days after LRYGB and 4 days after LDS (P < 0.001). Four and nine patients respectively had late complications (P = 0.121). Mean BMI at 1 year decreased from 54.8 to 38.5 kg/m(2) after LRYGB and from 55.2 to 32.5 kg/m(2) after LDS; percentage of excess BMI lost was greater after LDS (74.8 versus 54.4 per cent; P < 0.001). CONCLUSION: LRYGB and LDS can be performed with comparable perioperative safety in superobese patients. LDS provides greater weight loss in the first year.