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Background and aims Bariatric surgery is increasingly performed worldwide to treat morbid obesity and is also known as metabolic surgery to reflect its beneficial metabolic effects especially with respect to improvement in type 2 diabetes. Understanding surgical weight loss mechanisms and metabolic modulation is required to enhance patient benefits and operative outcomes.Methods The authors applied a parallel and statistically integrated bacterial profiling and metabonomic approach to characterise Roux-en-Y gastric bypass (RYGB) effects in a non-obese rat model. Results Substantial shifts of the main gut phyla towards higher concentrations of Proteobacteria (52-fold), specifically Enterobacter hormaechei, are shown. Low concentrations of Firmicutes (4.5-fold) and Bacteroidetes (twofold) in comparison with sham-operated rats were also found. Faecal extraction studies revealed a decrease in faecal bile acids and a shift from protein degradation to putrefaction through decreased faecal tyrosine with concomitant increases in faecal putrescine and diaminoethane. Decreased urinary amines and cresols were found and indices of modulated energy metabolism were demonstrated after RYGB, including decreased urinary succinate, 2-oxoglutarate, citrate and fumarate. These changes could also indicate renal tubular acidosis, which is associated with increased flux of mitochondrial tricarboxylic acid cycle intermediates. A surgically induced effect on the gutebraineliver metabolic axis is inferred from modulated faecal g-aminobutyric acid and glutamate. Conclusion This profound co-dependence of mammalian and microbial metabolism, which is systematically altered after RYGB surgery, suggests that RYGB exerts local and global metabolic effects. The effect of RYGB surgery on the host metabolicemicrobial cross-talk augments our understanding of the metabolic phenotype of bariatric procedures and can facilitate enhanced treatments for obesity-related diseases.

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The grey literature was also searched and experts in the field contacted for additional studies. Two independent reviewers selected articles which reported empirical research studies about clinicians or medical students. Conceptual articles and opinion pieces and commentaries were excluded. Information about the measure used to assess EI, the study parameter or domain, and the educational or clinical outcome (with specific relation to the ACGME competencies) was extracted.RESULTS The literature search identified 485 citations. An abstract review led to the retrieval of 24 articles for full-text assessment, of which 16 articles were included in the final review. Eleven studies focused on postgraduates, four on undergraduates and one on medical school applicants. Six out of seven studies found women to have higher EI than men. Higher EI was reported to positively contribute to the doctor-patient relationship (three studies), increased empathy (five studies), teamwork and communication skills (six studies), and stress management, organisational commitment and leadership (three studies).CONCLUSIONS Measures of EI correlate with many of the competencies that modern medical curricula seek to deliver. Further research is required to determine whether training can improve EI and thus augment educational and clinical outcomes.

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Laparoscopic rectal cancer surgery results in an earlier postoperative recovery and a resected specimen that is oncologically comparable to open surgery. Results from randomized trials reporting long-term outcomes such as cancer recurrence (local and metastatic) and 5-year survival are eagerly awaited.

Myopenia may have an independent prognostic effect on cancer survival for patients with colorectal cancer. Muscle depletion may represent a modifiable risk factor in patients with colorectal cancer and needs to be targeted as a relevant endpoint of health recommendations.