Where on a pressure-volume curve is HFV applied?
A. HFV occurs between the overdistention and derecruitment points.
B. Ventilation with HFV is provided above the overdistention point.
C. HFV is administered below the derecruitment point.
D. The application of HFV to the lungs varies depending on the respiratory frequency.
?ANS: A
A. Correct response: The combination of a substantial mean airway pressure to maintain recruitment and the limited tidal pressure swings should lead to reductions in both overstretch and repetitive opening-closing stresses in the lungs. In other words, HFV support is applied between the overdistention and the derecruitment points of the injured lung's pressure-volume relationship, the presumed ideal mechanical range for positive-pressure ventilatory support.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
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