On the partial expiratory flow-volume loop shown here, identify the point depicting the maximal expiratory flow at FRC.

Question

Quizplus · Accepted Answer

A relatively noninvasive technique to generate a partial expiratory flow volume (PEFV) curve in infants allows the measurement of expiratory flows during a forced maneuver in infants and small children. A rapid thoracic compression or "hug" is delivered to the sleeping infant's chest and abdomen with an inflatable jacket to produce a forced expiration. A pneumotachometer with a sealed face mask measures exhaled gas flow. The flow at the end-expiratory point of a normal resting tidal breath (FRC) is measured on the PEFV curve. This flow value, the maximal expiratory flow at FRC, is reported as liters per second.

On the Partial Expiratory Flow-Volume Loop Shown Here, Identify the Point