Brain scans help doctors treat strokes noticed only on waking

About one in five ischaemic strokes is a wake-up stroke, where symptoms appear after sleep and the onset time is unknown. Chennai neurologists say an immediate MRI, or a CT angiogram if MRI is unavailable, can reveal salvageable brain tissue, helping doctors decide on clot-dissolving thrombolysis or mechanical thrombectomy. They urge patients to reach hospital quickly because 'time is brain'.