A supplied hemodynamic calculation

A fictional cardiovascular laboratory records a mean pulmonary artery pressure of 46 mmHg, a pulmonary artery wedge pressure of 14 mmHg and cardiac output of 4 liters per minute. For this educational calculation the measurements are assumed technically valid and obtained under the specified resting conditions. The patient history, pulmonary imaging, lung function and thromboembolic assessment have not been provided. A learner subtracts the wedge pressure from the pulmonary pressure and divides by cardiac output. A second learner correctly obtains an elevated resistance but then labels the patient as having idiopathic Group 1 pulmonary arterial hypertension without further information. The supervisor separates the arithmetic result from the much broader etiological classification question.