A 78-year-old woman has a mean arterial pressure of 120 mm Hg and a heart rate of 60 beats/min. She has a stroke volume of 50 mL, cardiac output of 3000 mL/min, and a right atrial pressure of 0 mm Hg. What is the total peripheral resistance (in mm Hg/mL/min) in this woman?
A)0.01
B)0.02
C)0.04
D)0.08
E)0.10

Question

Quizplus · Accepted Answer

Total peripheral resistance (TPR) can be calculated using the formula: TPR = (Mean Arterial Pressure - Right Atrial Pressure) / Cardiac Output. Given the mean arterial pressure is 120 mm Hg, right atrial pressure is 0 mm Hg, and cardiac output is 3000 mL/min, TPR = (120 - 0) / 3000 = 0.04 mm Hg/mL/min. However, the correct unit for TPR is typically expressed in mm Hg * min / mL, which means the calculation provided was conceptually correct but misinterpreted the unit. The correct calculation should be TPR = ΔP/Q = 120 mm Hg / 3000 mL/min = 0.04 mm Hg * min / mL, indicating a mistake in the interpretation of the options provided. The correct answer based on the calculation is C) 0.04, acknowledging an error in the initial response.

A 78-Year-Old Woman Has a Mean Arterial Pressure of 120