BMJ 2012; 344 doi: https://doi.org/10.1136/bmj.e2538 (Published 11 April 2012) Cite this as: BMJ 2012;344:e2538

Warm weather exacerbates the symptoms of multiple sclerosis. A cross sectional analysis in Neurology investigated whether there was any association between outdoor temperature and cognitive status (2012;78:964-8, doi:10.1212/wnl.0b013e31824d5834). Warmer temperatures on the day of testing were related to worse cognitive status among 40 patients with multiple sclerosis, but not in 40 controls. And over time, in another 45 patients with multiple sclerosis, increased outdoor temperature between baseline and follow-up 6 months later was related to a decline in cognitive status.

In a trial of exenatide in patients with inadequately controlled type 2 diabetes, a subgroup of 17 patients received the drug in addition to insulin, which goes against current UK guidelines. This group of patients experienced greater weight loss than did the exenatide only group, but their glycated haemoglobin was slightly higher at six months (QJM 2012;105:321-6, doi:10.1093/qjmed/hcr180).

Blood transfusions adversely affect survival from lung cancer, and this effect is thought to be …

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