V/Q match refers to which of the following?

• A. Ventilation and arterial oxygen saturation correlation
• B. Ventilation-perfusion match, optimum exchange of oxygen and carbon dioxide
• C. Volume of air ventilated per minute and rate
• D. Ventricular/atrial coordination

Answer: (B)

V/Q match is about how well the air reaching the alveoli (ventilation) lines up with the blood flow through the pulmonary capillaries (perfusion) so gases can be exchanged efficiently. When ventilation and perfusion are well matched, oxygen moves into the blood and carbon dioxide leaves the blood and is exhaled.

The best choice captures this idea by describing it as a ventilation-perfusion match that enables optimum exchange of oxygen and carbon dioxide. If you think about problems, a mismatch can happen in two common ways: ventilation without perfusion (dead space) or perfusion without ventilation (a shunt). In the first, air reaches alveoli that aren’t being perfused, so gas exchange isn’t effective; in the second, blood passes by poorly ventilated alveoli, so oxygen uptake is limited and carbon dioxide removal is impaired.

The other options describe different concepts: ventilation with arterial oxygen saturation alone isn’t the full picture of gas exchange efficiency; minute ventilation (volume of air per minute) concerns ventilation alone, not how well it matches perfusion; and ventricular/atrial coordination is about heart rhythm, not lung gas exchange.