Pulmonary circulation during exercise in rats.

Pulmonary circulation at exercise.

The pulmonary circulation is a high-flow and low-pressure circuit, with an average resistance of 1 mmHg/min/L in young adults, increasing to 2.5 mmHg/min/L over four to six decades of life. Pulmonary vascular mechanics at exercise are best described by distensible models. Exercise does not appear to affect the time constant of the pulmonary circulation or the longitudinal distribution of resist...

Behavior of the pulmonary circulation at rest and during exercise in miliary tuberculosis.

We studied the hemodynamic behavior of the pulmonary circulation at rest and during exercise in six patients with MTB. As a group, in contrast to advanced fibrocaseous tuberculosis, these patients exhibited normal pulmonary hemodynamics at rest and during exercise. Only minor abnormalities in pulmonary vascular resistance at exercise (increased PAd-PWP gradient) were noted in two of the patient...

Studies of the pulmonary circulation at rest and during exercise in normal individuals and in patients with chronic pulmonary disease.

Studies of the cardiac output of normal individuals during muscular exercise have been made by several investigators (l-5). Systemic blood pressure has likewise been measured during exercise, making possible the calculation of peripheral resistance and the work of the left ventricle. Until recently (5), such information was not available in the case of the right ventricle because pulmonary arte...

Effects of acute hypoxia and exercise on the pulmonary circulation.

Exercise stress echocardiography for the study of the pulmonary circulation.

Exercise stress tests have been used for the diagnosis of pulmonary hypertension, but with variable protocols and uncertain limits of normal. The pulmonary haemodynamic response to progressively increased workload and recovery was investigated by Doppler echocardiography in 25 healthy volunteers aged 19-62 yrs (mean 36 yrs). Mean pulmonary artery pressure ((Ppa)) was estimated from the maximum ...