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Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
Published in: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine 1/2016

Open Access 01-12-2016 | Original research

Four ways to ventilate during cardiopulmonary resuscitation in a porcine model: a randomized study

Authors: Benedict Kjærgaard, Egidijus Bavarskis, Sigridur Olga Magnusdottir, Charlotte Runge, Daiva Erentaite, Jes Sefland Vogt, Mette Dahl Bendtsen

Published in: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine | Issue 1/2016

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Abstract

Background

The optimal method for out-of-hospital ventilation during cardiopulmonary rescue (CPR) is controversial.
The aim of this study was to test different modes of ventilation during CPR for a prolonged period of 60 min.

Methods

Pigs were randomized to four groups after the induction of ventricular fibrillation, which was followed by one hour of mechanical cardiac compressions. The study comprised five pigs treated with free airways, five pigs treated with ventilators, six pigs treated with a constant oxygen flow into the tube, and six pigs treated with apnoeic oxygenation.

Results

The free airway group was tested for 1 h, but in the first 15 min, the median PaO2 had already dropped to 5.1 kPa.
The ventilator group was tested for 1 h and still had an acceptable median PaO2 of 10.3 kPa in the last 15 min. The group was slightly hyperventilated, with PaCO2 at 3.8 kPa, even though the ventilator volumes were unchanged from those before induction of cardiac arrest.
In the group with constant oxygen flowing into the tube, one pig was excluded after 47 min due to blood pressure below 25 mmHg. For the remaining 5 pigs, the median PaO2 in the last 15 min was still 14.3 kPa, and the median PaCO2 was 6.2 kPa.
The group with apnoeic oxygenation for 1 h had a resulting median PaO2 of 10.2 kPa and a median PaCO2 of 12.3 kPa in the last 15 min.

Discussion

Except for the free airway group, the other methods resulted in PaO2 above 10 kPa and PaCO2 between 3.8 and 12.3 kPa after one hour.

Conclusion

Constant oxgen flow and apnoeic oxygenation seemed to be useable alternatives to ventilator treatment.
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Metadata
Title
Four ways to ventilate during cardiopulmonary resuscitation in a porcine model: a randomized study
Authors
Benedict Kjærgaard
Egidijus Bavarskis
Sigridur Olga Magnusdottir
Charlotte Runge
Daiva Erentaite
Jes Sefland Vogt
Mette Dahl Bendtsen
Publication date
01-12-2016
Publisher
BioMed Central
DOI
https://doi.org/10.1186/s13049-016-0262-z

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