Evening, Nighttime Brain Bleeds Linked to Poorer Recovery

TOPLINEPatients who experienced intracerebral haemorrhage (ICH) during evening or nighttime hours had greater disability at discharge than those who experienced it during morning or midday hours. Nighttime onset independently predicted worse functional outcomes; however, mortality was not independently associated with the time of ICH onset.METHODOLOGYDrawing on data from a prospective stroke registry in Germany, researchers examined whether the timing of ICH was associated with differences in patient characteristics, disease course, in-hospital complications, and short-term recovery.They analysed data of 5665 patients aged 18 years or older with atraumatic ICH hospitalised between 2015 and 2023 who had a recorded time of symptom onset and complete data on medical history, clinical course, and functional status.Patients were grouped by the time of symptom onset: morning (5:00 AM to 10:59 AM; n = 1847), midday (11:00 AM to 4:59 PM; n = 1867), evening (5:00 PM to 10:59 PM; n = 1402), and night (11:00 PM to 4:59 AM; n = 549).Functional disability, scored on the modified Rankin scale (mRS), at discharge was the primary endpoint; in-hospital mortality and complication rates during hospitalisation served as secondary endpoints.Inverse probability weighting and propensity score matching were used to adjust for baseline differences across groups.TAKEAWAYICH followed a clear daily pattern, with symptom onset peaking near 8:30 AM and again around 5:00 PM; only 10% of events occurred at night.In unadjusted analyses, patients with evening- or night-onset ICH had greater disability at discharge (median mRS score, 5 for both groups) than those with morning- or midday-onset ICH (median mRS score, 4 for both groups); these differences remained significant after adjustment (P < .01).Nighttime onset was independently associated with higher odds of disability at discharge (odds ratio [OR], 1.3). Other factors linked to greater disability at discharge included older age (OR, 1.02), advance healthcare directive (OR, 64.4), and the need for mechanical ventilation (OR, 3.03; P < .05 for all).Mortality and most in-hospital complications showed no significant differences across time-of-onset groups after adjustment.IN PRACTICE"[The] findings highlight the need for future prospective and mechanistic studies to disentangle the effects of biological rhythms (ie, circadian rhythms) from systemic care factors (eg, time-of-day factors related to behaviors), and to develop evidence-based strategies that ensure consistent stroke care quality around the clock," the authors wrote."In the future, this may support chronotherapeutic approaches in which interventions such as blood pressure control, hemostatic therapy, surgical evacuation, or anti-inflammatory treatments are optimized according to biological timing, which could contribute to more personalized management strategies and potentially improve patient outcomes," they added.SOURCEThe study was led by Franziska Lieschke, MD, Goethe University Frankfurt, University Hospital, Frankfurt am Main, Germany. It was published online on September 19, 2026, in the European Journal of Neurology.LIMITATIONSThe observational study design limited causal inference. Data on the subtype, size, and location of ICH and the use of antithrombotic therapy were not accounted for. The analysis drew on data from a German stroke registry, which may have limited the generalisability of the findings to other populations or healthcare settings.DISCLOSURESThe study received funding from the Faculty of Medicine at Goethe University Frankfurt through a Junior Clinician Scientist scholarship awarded to one author. Several authors reported receiving consulting fees, speaker honoraria, research support, personal fees, andhonoraria for participating in advisory boards from multiple companies and scientific organisations.This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.