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All diabetes & endocrinology briefings

The edition · Diabetes & Endocrinology

Surgery still beats the injection on the cardiovascular endpoints

A network meta-analysis of 932,000 patients finds bariatric surgery reduces MACE, heart failure and myocardial infarction while GLP-1 receptor agonists move only MACE. Also: insulin sensitivity swings with the menstrual cycle even under closed-loop control, a compounded semaglutide recall for particulate matter, and why the opioid you choose matters in a patient already on a GLP-1.

The edition in brief

A PRISMA network meta-analysis of 43 studies and 932,380 patients with obesity compared bariatric surgery, GLP-1 receptor agonists and control. Against control, surgery reduced major adverse cardiovascular events (HR 0.66, 95% CI 0.60-0.74), heart failure (HR 0.45, 0.38-0.53) and myocardial infarction (HR 0.53, 0.45-0.63). GLP-1 receptor agonists reduced MACE (HR 0.85, 0.77-0.94) with non-significant effects on heart failure and myocardial infarction. Heterogeneity was high, from 66% to 93%, and most contributing data are observational. A decentralised observational study of donated real-world data from 77 menstruating adults with type 1 diabetes using automated insulin delivery covered 380 cycles. Total daily insulin dose and carbohydrate intake peaked in the luteal phase alongside higher mean glucose and reduced time in range. A hierarchical Bayesian model estimated insulin sensitivity 2.6% higher in the early follicular phase (credible interval 0.3 to 5.0) and 2.6% lower in the midluteal phase (-5.2 to -0.1). The pattern held in 84.7% of participants with substantial individual variation. The FDA has listed Class II recalls dated 19 August 2026 of compounded semaglutide multi-dose vials from Apollo Care LLC across multiple strengths, for particulate matter identified as nylon/polyamide and silk or proteinaceous material. Status is ongoing. A new-user cohort of 411,188 adults with type 2 diabetes on GLP-1 receptor agonists who started an opioid found 30-day motility-related gastrointestinal events in 0.51% starting oxycodone, 0.35% hydrocodone and 0.33% tramadol. Oxycodone carried higher risk than hydrocodone (RR 1.48, 95% CI 1.30-1.69) and tramadol (RR 1.55, 1.33-1.79).

In this edition
01
Clinical update

Bariatric surgery versus GLP-1 receptor agonists on hard cardiovascular endpoints

Bariatric surgery was associated with reductions in MACE, heart failure and myocardial infarction, while GLP-1 receptor agonists reduced only MACE significantly — grounds for referring surgical candidates earlier, but the comparison is observational and heavily confounded.

3 min · Endocrinology, diabetes & metabolismRead →
Primary outcome
major adverse cardiovascular events, heart failure and myocardial infarction
Effect
surgery vs control: MACE HR 0.66 (95% CI 0.60-0.74), HF 0.45 (0.38-0.53), MI 0.53 (0.45-0.63); GLP-1RA vs control: MACE 0.85 (0.77-0.94), HF and MI non-significant; I-squared 66-93%
02Research

The closed loop does not know about the menstrual cycle

Insulin requirements rise and time in range falls in the luteal phase even under automated insulin delivery — ask menstruating patients about it, and look for a monthly rhythm in the download before blaming settings or adherence.

2 min · Diabetes careRead →
03Regulatory

Compounded semaglutide vials recalled for particulate matter

Compounded semaglutide multi-dose vials from one US compounder are under an ongoing Class II recall for particulate matter — a prompt to ask every patient on semaglutide which presentation they are actually injecting.

2 minRead →
04Pearl

Reading an ambulatory glucose profile in two minutes

Read a glucose download in this order — wear time, time below range, variability, then time in range — and use the daily overlay, not the summary, to decide which single change to make.

1 minRead →
05Practice changer

If your patient is on a GLP-1 and needs an opioid, oxycodone is the wrong one

In patients on a GLP-1 receptor agonist, starting oxycodone carried about a 50% higher 30-day risk of severe constipation or bowel obstruction than hydrocodone or tramadol — pick a different opioid where you can, and co-prescribe a laxative.

2 min · Diabetes careRead →

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