Which of the following statements refer(s) to the conclusion(s) of studies conducted to investigate the relationship among delivered volume, ventilator pressure, and the development of pulmonary edema? I. High volume ventilation caused less injury when PEEP was added. II. No pulmonary edema developed when high pressures and high tidal volumes were used. III. Pulmonary edema developed when low

Question

pressures and high tidal volumes were used. IV. No pulmonary edema was produced when high pressures and low tidal volumes were used.

A. I only
B. II, III only
C. I, III, IV only
D. II, III, IV only

Answer 1

?ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: In a study conducted by Webb and Tierney: (1) less pulmonary edema occurred when high volumes along with PEEP were used for ventilation, and (2) ventilation with a high PIP and 0 cm H2O PEEP produced more pulmonary edema.
According to research performed by Dreyfuss et al, (1) pulmonary edema developed in those ventilated with high pressures/high tidal volumes, (2) pulmonary edema occurred in those ventilated with low pressures/low tidal volumes, and (3) no pulmonary edema developed in those ventilated with high pressures/low tidal volumes.
D. Incorrect response: See explanation C.