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Background— Previous studies have shown that for the treatment of subarachnoid hemorrhage (SAH), outcomes are improved but costs are higher at hospitals with a high volume of admissions for SAH. Whether regionalization of care for SAH is cost-effective is unknown.

Methods and Results— In a cost-utility analysis, health outcomes for patients with SAH were modeled for 2 scenarios: 1 representing the current practice in California in which most patients with SAH are treated at the closest hospital and 1 representing the regionalization of care in which patients at hospitals with <20 SAH admissions annually (low volume) would be transferred to hospitals with ≥20 SAH admissions annually (high volume). Using a Markov model, we compared net quality-adjusted life-years (QALYs) and cost per QALY. Inputs were chosen from the literature and derived from a cohort study in California. Transferring a patient …