Browsing by Autor "Lockhart, A"

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Efectos hemodinámicos del ortostatismo en la altura
(Facultad de Medicina, Enfermería, Nutrición y Tecnología Médica, 1971) Lockhart, A
Summary. The authors investigated the hemodynamic repercussions of the orthostatism at high-altitude, in a group of normal subjects, native of the Bolivian Altiplano (High Plateau) (3.700 m.) during rest: in dorsal decupitus position and sitting position, during a muscular exercise on an ergometric bycicle: in a dorsal decupitus position and sitting position. The results obtained suggest that the circulatory perturbations due to orthostatism are diminished at high-altitude: It could be possible that the cause was a minor displacement of the blood to the veins of the infeiror limbs, and it seems that the venous tone plays an important role durgin the physiological adaptation period to the orthostatism.
Pressure-flow-volume relationships in the pulmonary circulation of normal highlanders : effects of unilateral pulmonary artery occlusion, exercise, and hypoxia
(Facultad de Medicina, Enfermería, Nutrición y Tecnología Médica, 1975) Lockhart, A
Summary. Pulmonary blood volume in NHL is comparable to that in sea level residents. In resting NHL, pulmonary hypertension is best explained by, structural changes in pulmonary vessels. In NHL, exercise elicits a pulmonary vasoconstriction which is probably due to mixed venous hypoxaemia superimposed upon alveolar hypoxia.