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Retrograde transmission of left atrial pressure across the pulmonary capillary bed was studied in dogs employing graduated left atrial pressures. Left atrial pressures below a level of 30 to 35 mm. Hg were transmitted across the pulmonary capillary bed as mean pressures; in the case of higher left atrial pressures the cyclic changes were transmitted with a certain amount of damping. Pressures were recorded both from the tip of a catheter wedged into a peripheral pulmonary artery and from the occluded main artery of one lung. Pressures recorded from the occluded main artery of one lung are a reflection of cyclic left atrial pressure variations and are less damped than those recorded from a wedged catheter tip.

Retrograde Transmission of Left Atrial Pressure Pulses Across the Pulmonary Capillary Bed in Dogs