PROBLEM SESSION ANSWERS: Problem 2

Answer: C = DV / DP = 0.9 L / 30 cmH2O = 0.03 L/cmH2O. Is much less than normal (0.1 L/cmH2O).

Notes: Cardiopulmonary bypass. Also, how positive pressure ventilation is accomplished -- endotracheal tube, pump or intermittent valve on air tank. Used for lung inflation and ventilation.

Question: Why might it be so low? Answer: Alveolar collapse (atelectasis); interference with ability to produce surfactant.