Certified Registered Nurse Anesthetist (CRNA) Practice Exam

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What is the normal range for pulmonary vascular resistance (PVR)?

50-100 dynes/sec/cm-5
100-250 dynes/sec/cm-5
250-300 dynes/sec/cm-5
300-500 dynes/sec/cm-5

The correct answer is: 100-250 dynes/sec/cm-5

The normal range for pulmonary vascular resistance (PVR) is considered to be between 100 to 250 dynes/sec/cm-5. PVR is a critical measurement that indicates the resistance the right ventricle must overcome to pump blood through the pulmonary circulation. Understanding this range is essential for evaluating patients with conditions such as pulmonary hypertension, where an increase in PVR can significantly impact cardiac function and overall hemodynamics. Maintaining a normal PVR is crucial for effective gas exchange and optimal lung performance. Values below the lower limit might suggest decreased resistance, possibly indicating vasodilation effects, while values above the upper limit can signify vascular occlusion or increased vascular tone often seen in disease states. Thus, recognizing the normal range helps practitioners identify potential complications and guide treatment plans effectively.