Which ASA physical status may not tolerate pneumoperitoneum well during laparoscopy, requiring caution with ventilation?

Which ASA physical status may not tolerate pneumoperitoneum well during laparoscopy, requiring caution with ventilation?

• A. ASA I
• B. ASA II
• C. ASA IV or V
• D. ASA III

Answer: (C)

The key idea is that tolerance to the physiological effects of pneumoperitoneum depends on cardiopulmonary reserve. Laparoscopic pneumoperitoneum uses CO2 to create a working space, which raises intraabdominal pressure. This can push the diaphragm up, decrease lung compliance, raise peak airway pressures, and cause more CO2 to be absorbed into the blood. Patients with severe systemic disease have little reserve to cope with these changes, so those with ASA IV or V are least able to tolerate pneumoperitoneum and require careful ventilation management. In practice, this means vigilant monitoring of airway pressures and end-tidal CO2, potentially lower insufflation pressures, gentler ventilation settings, and a plan to modify or convert if the patient's status destabilizes. By contrast, healthier patients (ASA I–II) tolerate the effects better, and even ASA III patients require caution but are more likely to handle the ventilation challenges than ASA IV/V.

The key idea is that tolerance to the physiological effects of pneumoperitoneum depends on cardiopulmonary reserve. Laparoscopic pneumoperitoneum uses CO2 to create a working space, which raises intraabdominal pressure. This can push the diaphragm up, decrease lung compliance, raise peak airway pressures, and cause more CO2 to be absorbed into the blood. Patients with severe systemic disease have little reserve to cope with these changes, so those with ASA IV or V are least able to tolerate pneumoperitoneum and require careful ventilation management. In practice, this means vigilant monitoring of airway pressures and end-tidal CO2, potentially lower insufflation pressures, gentler ventilation settings, and a plan to modify or convert if the patient's status destabilizes. By contrast, healthier patients (ASA I–II) tolerate the effects better, and even ASA III patients require caution but are more likely to handle the ventilation challenges than ASA IV/V.