Studies of the Pulmonary Circulation in Man at Rest. Normal Variations and the Interrelations Between Increased Pulmonary Blood Flow, Elevated Pulmonary Arterial Pressure, and High Pulmonary “Capillary” Pressures 1

While many studies have been carried out on the dynamics of the pulmonary circulation in ex- perimental animals, few studies of this subject have been made in man until recently. With the advent of the cardiac catheter (