Calculate the pulmonary vascular resistance (PVR) given the following measurements obtained during a hemodynamic study:

pulmonary artery pressure (PAP) = 40/22 mm Hg, pulmonary artery occlusion pressure (PAOP) = 12 mm Hg, blood pressure (BP) = 156/80 mm Hg, central venous pressure (CVP) = 19 mm Hg, cardiac output (C.O.) = 4.8 L/min, and heart rate (HR) = 68 beats/min.
a. 150 dyne ? sec ? cm?5
b. 267 dyne ? sec ? cm?5
c. 317 dyne ? sec ? cm?5
d. 1496 dyne ? sec ? cm?5

ANS: B
PVR = [(MPAP − MLAP)/PBF] ? 80