Abstract TP424: Re-bleed in Nontraumatic Convexity Subarachnoid Hemorrhage

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Introduction: Re-bleeding can have significant adverse consequences, but has not been well described in isolated nontraumatic convexity subarachnoid hemorrhage (cSAH), and therefore we sought to report the clinical spectrum of re-bleed in this population.

Methods: With IRB approval, we retrospectively reviewed consecutive nontraumatic cSAH admitted to our institution from August 1, 2006 to June 1, 2016. cSAH was defined as radiographic hemorrhage isolated to the convexities, without cisternal component. Trauma was excluded. Data was abstracted on demographics, medical history, neuroimaging, etiology, and clinical presentation. Good clinical outcome was defined as modified rankin score of 0-2 at 3 months.

Results: Among 93 cSAH patients, re-bleed occurred in 9 (10%) patients. The mean age of patients with re-bleed was 55.6 years (range, 24-68) and 8 (89%) were women. The majority 6 (67%) were Hispanic. Most patients 8 (89%) presented with severe headache. The etiology of cSAH was reversible cerebral vasoconstriction syndrome (RCVS) in 6 (67%), amyloid angiopathy in 1 (11%), cerebral venous thrombosis (CVT) in 1 (11%), and post-procedural related in 1 (11%). Initial re-bleeding was new remote subarachnoid hemorrhage in 1 (11%) and new intracerebral hemorrhage in 8 (89%). Clinical symptoms of initial re-bleeding included isolated worsening headache in 2 (22%), focal neurological deficits in 4 (44%), and no clinical change in 3 (33%). Time from initial neuroimaging documenting cSAH to CT documenting re-bleed was 40 hours (range, 5 - 74), and re-bleed occurred within 60 hrs in most patients (89%). Two patients had subsequent re-bleeding (due to CVT and RCVS) documented at 1.9 and 11.8 hours after the initial re-bleed CT. Good clinical outcome was seen in 7 (78%) .

Conclusion: Re-bleeding was seen in 10% of cSAH patients and in the majority of patients occurred early, within 2.5 days. Clinicians should be aware of this potential complication of cSAH.

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