Normal PVR is in which range?

Normal PVR is in which range?

• A. 50 to 150 dynes-sec-cm-5
• B. 10 to 50 dynes-sec-cm-5
• C. 200 to 300 dynes-sec-cm-5
• D. 5 to 20 dynes-sec-cm-5

Answer: (A)

PVR reflects the afterload the right ventricle must pump against in the pulmonary circulation. In healthy individuals, this resistance is relatively low. The normal range is about 50 to 150 dynes·sec·cm^-5. You can connect this to Wood units (1 Wood unit = 80 dyn·s·cm^-5): normal PVR is roughly 0.6–2.0 Wood units, which corresponds to about 50–160 dyn·s·cm^-5. For a quick check, PVR is calculated as (mean pulmonary artery pressure − left atrial pressure) ÷ cardiac output; using typical values (MPAP ≈ 15 mmHg, LA pressure ≈ 5 mmHg, CO ≈ 5 L/min) gives about 2 Wood units, or ~160 dyn·s·cm^-5, sitting within the normal range. Values outside this window suggest abnormal pulmonary vascular resistance, such as pulmonary hypertension (higher PVR) or other hemodynamic abnormalities.

PVR reflects the afterload the right ventricle must pump against in the pulmonary circulation. In healthy individuals, this resistance is relatively low. The normal range is about 50 to 150 dynes·sec·cm^-5. You can connect this to Wood units (1 Wood unit = 80 dyn·s·cm^-5): normal PVR is roughly 0.6–2.0 Wood units, which corresponds to about 50–160 dyn·s·cm^-5. For a quick check, PVR is calculated as (mean pulmonary artery pressure − left atrial pressure) ÷ cardiac output; using typical values (MPAP ≈ 15 mmHg, LA pressure ≈ 5 mmHg, CO ≈ 5 L/min) gives about 2 Wood units, or ~160 dyn·s·cm^-5, sitting within the normal range. Values outside this window suggest abnormal pulmonary vascular resistance, such as pulmonary hypertension (higher PVR) or other hemodynamic abnormalities.