Development of a nomogram for predicting clinical outcome in patients with angiogram-negative subarachnoid hemorrhage.

Symptomatic vasospasm, high WFNS, cerebral edema, and NPAN-SAH after hemorrhage were associated with poor outcome of AN-SAH. The nomogram with WFNS (3-5), SEBES (3-4), vasospasm, and NPAN-SAH represented a practical approach to provide individualized risk assessment for AN-SAH patients.