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Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism
Published on: February 14, 2022
How much lung ventilation is obtained with only chest-compression CPR?
L A Geddes1, A Rundell, M Otlewski
1Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907-2032, USA. geddes@ecn.purdue.edu
Cardiovascular Engineering (Dordrecht, Netherlands)
|June 27, 2008
Summary
Rhythmic chest compression alone does not effectively ventilate the lungs. This study found that chest compression breathing resulted in negative alveolar ventilation, indicating insufficient lung ventilation.
Area of Science:
- Physiology
- Cardiopulmonary Resuscitation
Background:
- Effective lung ventilation is critical during cardiopulmonary emergencies.
- Chest compressions are a fundamental component of cardiopulmonary resuscitation (CPR).
Purpose of the Study:
- To quantify lung ventilation achieved solely through rhythmic chest compression.
- To compare alveolar ventilation during normal breathing versus chest compression breathing.
Main Methods:
- A study involving 14 pigs was conducted.
- Measurements included tidal volume (TV) and dead space (DS) during normal breathing and chest compression.
- Respiration rate (R) and the TV/DS ratio were calculated.
Main Results:
- Normal breathing yielded a TV/DS ratio of 2.54 ± 0.68 and positive alveolar ventilation (5.48 ± 2.1 l/min).
- Chest compression breathing resulted in a significantly lower TV/DS ratio of 0.80 ± 0.07.
- Alveolar ventilation during chest compression alone was negative (-1.49 ± 0.64 l/min).
Conclusions:
- Rhythmic chest compression alone is insufficient to achieve adequate lung ventilation.
- Tidal volume generated by chest compressions was less than the physiological dead space.
- Chest compression alone does not provide effective alveolar ventilation.
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