During the early part of the present century a great deal of attention was focused on the use of a chamber in which negative pressure could be maintained during operations on the chest. Such a chamber was devised by Sauerbruch1 and was employed extensively in Germany. Subsequently this method was discarded because of the inconveniences which were associated with its use and because a method for inflating the lungs by positive pressure was devised. Recently Beck and his associates in this country have revived interest in the negative pressure chamber as a result of the experimental work that they have performed.
Beck and Cox2 and Beck and Isaac3 found that exposure of the heart of the dog to atmospheric pressure caused a rise in the venous pressure, a temporary decline in the arterial pressure and a decrease in the output of the heart. In the experiments of
BLALOCK A. EXPOSURE OF THE HEART TO ATMOSPHERIC PRESSUREEFFECTS ON THE CARDIAC OUTPUT AND BLOOD PRESSURE. Arch Surg. 1933;26(3):516–521. doi:10.1001/archsurg.1933.01170030173012