OBJECTIVE: The use of CO2 to promote pneumoperitoneun in laparoscopic surgeries causes hipercarbia. Expired air CO2 partial pressure may estimate this change.The purpose of this study is to determine whether there is a correlation between arterial CO2 partial pressure and expired air CO2 partial pressure during laparoscopic surgeries. METHODS: Twenty female pigs were assigned to two groups: one without pneumoperitoneun and another with a 12 mmHg intra abdominal pressure. Endotracheal pressure, arterial CO2 saturation, expired air CO2 partial pressure, pH and arterial CO2 partial pressure were determined. RESULTS: After performing pneumoperitoneun there was a marked increase in endotracheal pressure, expired air CO2 partial pressure and arterial CO2 partial pressure. CONCLUSIONS: In spite of the increase in both CO2 arterial partial pressure and expired air partial pressure, there was no linear correlation between them, so that it is not possible to estimate arterial CO2 partial pressure by the expired air CO2 partial pressure during laparoscopic surgeries.
Laparoscopy; Expired Air CO2 Partial Pressure; Arterial CO2 Partial Pressure
