PMID: 8676590May 1, 1996

Relation of pulmonary hemodynamics and ventilation to tissue hypoxia during exercise in patients with tuberculosis sequelae

Kekkaku : [Tuberculosis]
T YamamotoT Kuriyama

Abstract

We examined a relationship between tissue hypoxia and pulmonary hemodynamics or ventilatory capacity during rest and exercise in patients with tuberculosis sequelae. Nine patients performed exercise test until their symptom limit. Mean pulmonary arterial pressure (PPA) during exercise was plotted against cardiac index (C.I.) from rest to maximum exercise in each patient. In most of the patients, the changes of PPA showed linear relation with the C.I., and a slope (P-F slope) was obtained from the regression equation in each patient, and it was used as an index of circulatory disability during exercise. At the same time a coefficient of oxygen delivery (COD) was calculated and mixed venous oxygen tension (PvO2) was measured to evaluate a tissue hypoxia at rest and during exercise. The changes of COD were similar to those of PvO2 during exercise. COD positively correlated with PvO2 (R = 0.873, P < 0.01) from rest to maximal exercise, indicating that the values of PvO2 depended on those of COD. P-F slope negatively correlated with S.I. (R = -0.887, P < 0.01), oxygen transport (R = -0.780, P < 0.01), COD (R = -0.827, P < 0.01) and PvO2 (R = -0.760, P < 0.01) at maximal exercise. Whereas no significant relationship between ventilato...Continue Reading

Related Concepts

Cardiopulmonary Exercise Test
Hemodynamics
Pulmonary Circulation
Regression Analysis
Respiration
Rest
Tuberculosis, Pulmonary
Exercise, Isometric
Cell Hypoxia

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