Relationship of number of coexisting medical conditions and perioperative cardiac arrest outcomes. (A) Event survival, (B) survival to 24 h after event, (C) survival to discharge, (D) good neurological outcome (cerebral performance category [CPC] 1) at discharge. The X-axis shows number of coexisting medical conditions and Y-axis shows frequency (%) of outcome. Solid lines represent patients with good neurological status (CPC 1) at admission and interrupted lines represent patients with baseline neurologic deficits at admission (CPC 2–4). There is no relationship between number of comorbidities and neurologically intact survival in patients without baseline neurologic deficits at admission.