TYK38

All of the following are true concerning V/Q ratios EXCEPT:

A. In an awake, spontaneously breathing patient, the normal matching of V/Q is 0.8

B. An absolute shunt has a V/Q value of 0.

C. Hypoxic pulmonary vasoconstriction (HPV) is an intrapulmonary mechanism that attempts to minimize V/Q mismatching.

D. Deadspace is represented by a V/Q value of 0.5.

Answer

The answer is D. Deadspace ventilation is represented by a value of infinity and certainly >0.5. All other choices are correct.