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Type of publication: Diploma Thesis
Type of document:

Year: 2010

Authors: Häusler, Daniela

Title: Vergleich der Druckkurven während PEEP (positive end expiratory pressure) erzeugt mit zwei verschiedenen Methoden an unterschiedlichen Lokalisationen des Atemsystems.

Other title: Comparison of the pressure waves during PEEP (positive end expiratory pressure) produced with two different methods at different locations of the breathing circle

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 43.


Auer Ulrike
Schramel Johannes

Holzmann Alois

Vetmed Research Units:
University Clinic for Small Animals, Clinical Unit of Anaesthesiology and Perioperative Intensive-Care Medicine

Graduation date: 22.09.10

The aim of this work was to compare the airway pressure and waves during IPPV with PEEP, produced with two different methods (the water column and the feather) at different locations in the breathing circle and using an in vitro simulation. We created four different situations: 1) The water column was connected to the waste gas outlet of the ventilator 2) The water column was installed in the expiratory limb. It was positioned between the expiratory limb (in front of it) and the expiratory valve (following it) 3) The feather was connected to waste gas outlet of the ventilator 4) The feather was positioned on top of the expiratory valve To measure the PEEP level we used: a) A mechanical system: standard build in manometers at the ventilator and at the CO2 absorber b) Electronic pressure transducer: Pitot spirometric sensor and differential pressure transducer of an anesthesia multiparameter monitor The results in situation two and four showed that only the pressure measurement at they – piece recognises PEEP. The two manometers of the anesthetic circle system failed to detect PEEP. This is possibly confusing for anesthesists who are unaware of this fact in these situations. Pressure measurement at the y – piece is necessary. The results in situation one and three showed that all locations detected the same PEEP level. This means that in those situations the manometers are reliable if there is no need for pressure measurement at they – piece of the circle system.

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