The importance of national registries/databases in metabolic surgery: the UK experience.

The United Kingdom (UK) National Bariatric Surgery Registry (NBSR) is a registry of self-reported bariatric surgery from members of the British Obesity and Metabolic Surgery Society. We describe the registry and its usefulness and limitations in improving the knowledge base for metabolic and bariatric surgery, reviewing the main results for the first 5 years of its introduction since 2009. We also review the reports of other national and international bariatric surgery registries and compare the baseline characteristics, including metabolic parameters, of the patients entered into the NBSR. A total of 161 surgeons from 137 UK bariatric surgery units entered 32,212 anonymized patient records. Of these patients, 76% were female, mean weight at preoperative clinic was 135.6 kg, body mass index was 48.8 kg/m(2), and 76.5 % had publicly funded National Health Service treatment. The 3 most common procedures were gastric bypass (55.3%), gastric banding (20.4%), and sleeve gastrectomy (20.2%), although the prevalence of these changed over time and was different between public and private sectors. The 2-year rate for diabetes improvement was 61.5%, but this varied with the duration of diabetes and baseline diabetic therapy. The data were similar to those from other large registries. Establishment of large national registries such as the NBSR has the potential to provide "real-world" information for quality assurance and the effect of metabolic and bariatric surgery on the whole operated population.