• Adnan I Qureshi, Nauman Jahangir, Mushtaq H Qureshi, Archie Defillo, Ahmed A Malik, Gregory T Sherr, and M Fareed K Suri.
• Zeenat Qureshi Stroke Institute, St. Cloud, MN, USA, qureshai@gmail.com.
• Neurocrit Care. 2015 Jun 1; 22 (3): 409-13.

BackgroundThere is a paucity of reliable and recent data regarding epidemiology of non-aneurysmal subarachnoid hemorrhage (SAH) in population-based studies.ObjectivesTo determine the incidence and case fatality of non-aneurysmal SAH using a population-based design.MethodsMedical records and angiographic data of all patients from Stearns and Benton Counties, Minnesota, admitted with SAH were reviewed to identify incident case of non-aneurysmal SAH. Patients with a first-time diagnosis of non-aneurysmal SAH (based on two negative cerebral angiograms performed ≥7 days apart) between June 1st, 2012 and June 30th, 2014 were considered incident cases. We calculated the incidences of non-aneurysmal and aneurysmal SAH adjusted for age and sex based on the 2010 US census.ResultsOf the 18 identified SAH among 189,093 resident populations, five were true incident cases of non-aneurysmal SAH in this population-based study. The age- and sex-adjusted incidence of non-aneurysmal SAH were 2.8 [95 % confidence interval (CI) 2.7-2·9] per 100,000 person-years which was lower than aneurysmal SAH incidence of 7.2 [95 % CI 7.1-7.4] per 100,000 person-years. The age-adjusted incidence of non-aneurysmal SAH was similar (compared with aneurysmal SAH) among men; 3.2 [95 % CI 3.1-3.3] per 100,000 person-years versus 2.2 [95 % CI 2.1-2.3] per 100,000 person-years, respectively. The age-adjusted case fatality rate at 3 months was 4.46 and 0.0 per 100,000 persons for aneurysmal and non-aneurysmal SAH, respectively.ConclusionsThe incidence of non-aneurysmal SAH was higher than previously reported particularly among men.

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