High-normal P a CO 2 values might be associated with worse outcome in patients with subarachnoid hemorrhage – a retrospective cohort study

Background While both hypercapnia and hypocapnia are harmful in patients with subarachnoid hemorrhage (SAH), it is unknown whether high-normal PaCO2 values are better than low-normal values. We hypothesized that high-normal PaCO2 values have more detrimental than beneficial effects on outcome.