Effect of Arterial Blood Pressure on the Arterial to End-tidal Carbon Dioxide Difference During Anesthesia Induction in Patients Scheduled for Craniotomy

Background: Before obtaining results of arterial blood gas analysis in mechanically ventilated patients undergoing neurosurgery, the volume of ventilation is primarily adjusted according to endtidal CO2 (EtCO2). We characterized the impact of various arterial blood pressure changes on arterial PCO2 (PaCO2) to EtCO2 differences (PaCO2-EtCO2) in patients anesthetized for craniotomy