Abstract 194: Spontaneous Spinal Subarachnoid Hemorrhage A Mayo Clinic Case Series

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Background: Spontaneous spinal subarachnoid hemorrhage (SSAH) is a rare but serious condition that can lead to a variety of medical complications.Methods: Using the Mayo Clinic Rochester database, patients admitted to the Mayo Clinic Rochester, MN hospital with spontaneous SSAH (not iatrogenic or traumatic) between January 2000 and December 2015 were retrospectively reviewed. Demographic and clinical data and functional outcomes as described by the modified Rankin Scale (mRS) score at the time of discharge and at post-admission follow-up were assessed.Results: Eight consecutive patients (median age 70 years, range 51-87) were identified. Seven patients presented with acute onset back pain or headache. Seven patients had poorly controlled chronic hypertension. Two patients had vasculitis, and one had an arteriovenous malformation (AVM). An increase in blood pressure was observed in all patients during their acute presentation as compared to their baseline outpatient readings. Complications included cord compression (n = 4), hyponatremia (n = 5), sulcal subarachnoid hemorrhage (n = 2), chronic arachnoiditis (n=1), vasospasm (n=1), and late cord ischemia (n = 1). All eight patients were managed medically including blood pressure control and repeat imaging. One patient had an aneurysm which was embolized, and two received steroids for vasculitis. One patient died during hospitalization, one died within a week of discharge, five had improved mRS score at post-hospitalization follow-up and had unchanged mRS of 1 at discharge and follow-up.Conclusions: To our knowledge this is the first compilation of cases of spontaneous SSAH. Risk factors for spontaneous SSAH are hypertension, AVM, vasculitis, coarctation of the aorta, and malignancy. Symptomatic cord compression is not uncommon, but can be managed conservatively.

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