Which of the following are associated with a decreased end-tidal PCO₂?
1) Decreased metabolic rate
2) Increase in lung perfusion
3) Rapid and very shallow breathing
4) Decreased CO₂ production

Question

Quizplus · Accepted Answer

Decreased end-tidal PCO2 can result from a decreased metabolic rate (less CO2 produced), rapid and very shallow breathing (increased ventilation relative to CO2 production), and decreased CO2 production directly. Increased lung perfusion without a corresponding increase in ventilation would not typically decrease end-tidal CO2.

Which of the Following Are Associated with a Decreased End-Tidal