Purpose: Carbon dioxide (CO2) is a potent cerebral vasomotor agent. Despite reduction in CO2 levels (hypocapnia) being described in several acute diseases, there is no clear data on baseline CO2 values in acute stroke. The aim of the study was to systematically assess CO2 levels in acute stroke. Material and methods: Four online databases, Web of Science, MEDLINE, EMBASE and CENTRAL, were searched for articles that described either partial pressure of arterial CO2 (PaCO2) and end-tidal CO2 (EtCO2) in acute stroke.

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