Abstract

In two dogs, intrathoracic and endoesophageal pressure were simultaneously recorded. Between intrathoracic and endoesophageal pressure variations a difference of magnitude was found, depending upon a) the elastance of the esophageal walls and b) the volume/pressure coefficient of the measuring equipment of the endoesophageal pressure. Knowing a) and b) from endoesophageal pressure measurements, intrathoracic pressure variations may be calculated. Submitted on December 15, 1958

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