The Lung Circulation

The circulation of the secondary lobule of the human lung.

els has proved to be a useful method for the study of the capillary circulation of the lung. Until recenth’, we felt that studying the capillary circulation in the component parts of the primary lobule** would reveal all the aspects of the terminal arterial circulation. It has been found, however, that the primary lobule does not disclose all the details of the terminal arterial vessels and the...

Stretch reflexes from the dog's lung to the systemic circulation.

IT IS generally accepted that the reflex circulatory effects of normal lung inflation and deflation are insignificant. The complex interaction of mechanical and neurogenic effects of lung inflation has made a study of reflex mechanisms particularly difficult. Relevant information can be derived only from experiments in which mechanical factors, such as changes of the pulmonary blood flow and ta...

The circulation, the lung, and finger clubbing in hepatic cirrhosis.

Haemodynamic and respiratory data were obtained by gasometric methods in two groups of patients with hepatic cirrhosis, who were distinguishable by the presence or absence of finger clubbing. Cardiac index and venoarterial admixture were significantly higher in cases with clubbing; these findings are discussed. However, levels of venoarterial admixture were normal in four with clubbing, which s...

The normal lung circulation. State of the art.

Distensibility of the normal human lung circulation during exercise.

Increasing pulmonary arterial (Ppa) and wedge (Pw) pressures at high flow (Q) during exercise could distend the thin-walled vessels. A mechanical descriptor of vascular distension, the distensibility (alpha, fractional diameter change/mmHg pressure), has been reported to be approximately 0.02 for isolated large and small arteries, i.e., a 2% change in diameter per millimeter mercury pressure. I...