• Gian Marco De Marchis, Hector Lantigua, J Michael Schmidt, Aaron S Lord, Alan J Velander, Andres Fernandez, M Cristina Falo, Sachin Agarwal, E Sander Connolly, Jan Claassen, and Stephan A Mayer.
• Departments of Neurology and Neurosurgery, Columbia University College of Physicians and Surgeons, , New York, New York, USA.
• J. Neurol. Neurosurg. Psychiatr. 2014 Jan 1; 85 (1): 56-9.

ObjectiveArterial hypertension (HTN) is a risk factor for subarachnoid haemorrhage (SAH). We aimed to assess the impact of premorbid HTN on the severity of initial bleeding and the risk of aneurysm rebleeding after SAH.DesignRetrospective analysis of a prospective cohort study of all SAH patients admitted to Columbia University Medical Center between 1996 and 2012.ResultsWe enrolled 1312 consecutive patients with SAH; 643 (49%) had premorbid HTN. Patients with premorbid HTN presented more frequently as Hunt-Hess Grade IV or V (36% vs 25%, p<0.001) and World Federation of Neurosurgical Societies (WFNS) Grade 4 or 5 (42.6% vs 28.2%, p<0.001), with larger amounts of subarachnoid (Hijdra Sum Score 17 vs 14, p<0.001) and intraventricular blood (median IVH sum score 2 vs 1, p<0.001), and more often with intracerebral haemorrhage (20% vs 13%, p=0.002). In multivariate analysis, patients with premorbid HTN had a higher risk of in-hospital aneurysm rebleeding (11.8% vs 5.5%, adjusted OR 1.67, 95% CI 1.02 to 2.74, p=0.04) after adjusting for age, admission, Hunt-Hess grade, size and site of the ruptured aneurysm.ConclusionsPremorbid HTN is associated with increased severity of the initial bleeding event and represents a significant risk factor for aneurysm rebleeding. Given that aneurysm rebleeding is a potentially fatal-but preventable-complication, these findings are of clinical relevance.

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