During a Patient Case Study,increasing Increments of PEEP Showed No

Multiple Choice

During a patient case study,increasing increments of PEEP showed no significant effects until 15 cm H₂O was used,at which time the PaO₂ improved markedly.This represents the point at which _______________.

A) cardiac output decreased
B) airway resistance decreased
C) hemoglobin saturation improved
D) alveolar recruitment probably occurred