PULMONARY CAPILLARY BLOOD FLOW IN MAN MEASURED BY A NEW N2O ANALYZER

Effect of respiration on pulmonary capillary blood flow in man.

Pulmonary capillary blood flow was measured in man during slow breathing by a modification of the body plethysmogTaph technique for measuring N2O uptake. In seated subjects breathing slowly, flow was significantly higher during inhalation. In supine subjects whose legs were raised, the difference between inhalation and exhalation was not significant. Flow was usually greater during tidal inhala...

Determination of the pulmonary capillary blood flow in man.

SEVERAL different methods based on respiratory maneuvers have been developed for the measurement of the rate of pulmonary capillary blood flow in man. These methods fall into two groups: (1) those involving the determination of the COo or 02 content of arterial and mixed venous blood from an analysis of alveolar gas—the first of these "indirect Pick methods" was developed by Loewy and von Schro...

A method for estimating instantaneous pulmonary capillary blood flow in man.

Vertical distributions of pulmonary diffusing capacity and capillary blood flow in man.

In six normal upright subjects, a 100 mol bolus-composed of equal parts of neon, carbon monoxide, and acetylene (Ne, CO, and C(2)H(2))-was inspired from either residual volume (RV) or functional residual capacity (FRC) during a slow inspiration from RV to total lung capacity (TLC). After breath holding and subsequent collection of the exhalate, diffusing capacity and pulmonary capillary blood f...

Pulmonary capillary arterial pressure pulse in man.

In 1948, Hellems, Haynes, Dexter, and Kinney, using venous and arterial catheterization in dogs obtained pressure recordings from both sides of the pulmonary capillary bed. The method consisted in wedging the tip of a cardiac catheter into a small branch of the pulmonary artery and of the pulmonary vein respectively, and recording the mean blood pressures in the obstructed vascular bed distal t...