Answer to Question 1
ANS: B
Because the primary goal of mechanical ventilation is to provide adequate oxygenation at safe levels of FiO2 while maintaining adequate DO2 to the body, the inverse relation between PEEP and cardiac output must be considered.
Answer to Question 2
ANS: B
HFV was designed to simultaneously maintain adequate ventilation and reduce alveolar collapse through ventilation with high expiratory lung volumes and rapid (up to 300 breaths/min), small tidal volumes (3 to 5 ml/kg).