Best place to start if new atrial fibrillation is part of your usual work. When the rate feels out of proportion, confirm the rhythm, add TSH and free T4 early, and think about thyroid storm or levothyroxine over-replacement before the case drifts into routine rate control.

A sepsis-like collapse with cytopenias, liver failure and diarrhoea becomes much more useful when ferritin, triglycerides and fibrinogen move up the list. Open this for a sharp reminder that HLH is not the end of the diagnosis, and that chronic thrombocytopenia with hepatosplenomegaly deserves a storage-disorder work-up.

Worth opening if your unit sees stroke. Late-presenting patients without large vessel occlusion may still enter a reperfusion pathway when imaging shows salvageable tissue, and adjunct intra-arterial alteplase after thrombectomy comes with selection, protocol and audit requirements.

Useful because it treats sleep as a clinical performance problem rather than a lifestyle extra. The practical take-home is timing: caffeine cut-off, brief naps, dark rooms, lighter meals and lower-dose melatonin used deliberately instead of hoping exhaustion will do the job.

A focused operative teaching episode for anyone who sees elbow trauma or reviews complex elbow imaging. The useful move is to stop calling these fracture-dislocations ‘scary’ and classify them by coronoid attachment, because that changes fixation priorities, radial head checks and the search for ligament injury.