A patient has a mean arterial blood pressure of 95 mmHg and a central venous pressure of 5 mmHg. If the patient's cardiac output is 5.0 L/min, what is the systemic vascular resistance (SVR)?
Answer and explanation
Correct answer: C. 18 mmHg·min/L
By analogy to Ohm's law (V = I * R), vascular resistance is calculated as the pressure drop divided by flow rate: SVR = (MAP - CVP) / CO. Substituting values: SVR = (95 mmHg - 5 mmHg) / 5.0 L/min = 90 mmHg / 5.0 L/min = 18 mmHg·min/L (or 18 Wood units).
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