A 37-yr-old female presented with a history of several months of exertional dyspnoea. A diagnosis of primary pulmonary hypertension was suspected on the basis of a negative extensive cardiorespiratory work-up with a systolic pulmonary artery pressure of 41-46 mmHg calculated from repeated measurement of the maximum velocity of tricuspid regurgitation jets at 2.8-3 m x s(-1) by continuous-wave Doppler echocardiography. However, a right heart catheterization with a high-fidelity transducer-tipped catheter revealed pulmonary artery pressures of 22/8 mmHg at rest, which remained within normal limits at exercise. This case indicates a possible misleading overestimation of pulmonary artery pressures from Doppler echocardiographic studies of tricuspid regurgitation.
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