Hemodynamic responses to hypoxia and hyperoxia in calves at sea level and altitude

摘要: Hemodynamic studies were done in nine male Holstein calves, born at sea level, 250 m (PB 740 mm Hg) and eight of these calves after 2 4 weeks 3400 altitude 510 Hg). Cardiac index (CI) decreased significantly as compared to level it was further weeks. This reduction CI resulted from stroke (SI) with unchanged heart rate (HR). Mean pulmonary arterial pressure (PAM) rose 26 Hg 63 74 m, respectively. Both systolic diastolic pressures substantially increased altitude, the relatively more than (4.5 fold increase vs. 2.5 fold). Aortic blood (systolic, mean) did not change m. Right ventricular (systolic) atrial (mean) altitude.