Methode zur Messung absoluter Intrapleuraldrucke mit dem Ösophagus-Ballonkatheter

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Abstract
The experiments were performed on anesthetized dogs lying on 1 or the other side, and involved simultaneous recording of esophageal and pleural pressures. The measurements were made during normal and restricted respiration and also under static conditions after paralysis of respiration by succinylcholine. If the balloon catheter is not closed off from the outside air before introduction into the esophagus, the pressures measured in the esophagus are dependent on the predominating direction of pressure of the actual phase of respiration at the moment of closure, but if the catheter is introduced closed, the pressures are not dependent on this. Pressure volume curves of the balloon catheter in air and in the esophagus during normal and restricted respiration show the relationship of the pressures and pressure ranges to the extent of the filling of the balloon. Only at a certain balloon volume which differs according to the size of the measurement system are the esophageal and pleural pressures the same in absolute values and in amplitude, while an accurate zero registration can only be made by the interposition of a 3-way cock between the balloon catheter and the measurement system. A method is described which enables absolute intrapleural pressures to be measured with the esophageal balloon catheter. With an optimally adjusted balloon catheter both esophageal and pleural pressures during normal and restricted respiration and also in static conditions agree.