[Determination of pulmonary arterial pressure and pulmonary vasoconstrictive responses to hypoxia in healthy Tibetan men].

Elevated pulmonary arterial pressures have been observed in persons after acute or chronic exposure to high altitude. Five normal lifelong male of Tibet descents, 22 +/- 1 years old residents, at the altitudes of over 3658 m were studied in Lhasa (3658 m, 65.3 kPa PB) at rest and during near-maximal exercise. The resting PAM (2 +/- 0.3 kPa, 15 +/- 1 mmHg) and PVR (1.8 +/- 0.2 Wood units) were within sea-level norms and were little changed while...