Abstract
Evidence is presented from a study of the circulation time in cases undergoing collapse therapy of three types, pneumothorax, thoracoplasty, and extrapleural pneumothorax, that the rate of blood flow is accelerated after collapse. A comparison of the ether time and the arm to tongue time by the calcium gluconate method suggests that this acceleration takes place in the first part of the circuit before reaching the pulmonary endothelium. Determinations made by earlier observers failed to show this change because they were made too soon after the institution of collapse therapy, before the compensatory forces responsible for the accelerated blood flow had had opportunity to become effective. Venous pressure measurements showed no alteration two to three months after surgery was performed. In the course of pneumothorax a transient rise is frequently observed.
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