Which of the following terms is used to describe the phenomenon of intraunit gas mixing because of impedance difficulties?
A. convective gas transport
B. molecular diffusion
C. coaxial flow
D. Pendelluft
ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: Pendelluft is the phenomenon of intraunit gas mixing caused by impedance differences. This intraunit gas mixing also can involve airway gas and thus produce effective alveolar ventilation. Pendelluft has been particularly pronounced when HFV is used with heterogeneous impedances.
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