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Respiratory responses to chest compression in human subjects
T Nishino1, T Ishikawa, A Tanaka
1Department of Anesthesiology, National Cancer Center Hospital, Tokyo, Japan.
The American Review of Respiratory Disease
|October 1, 1992
Summary
Respiratory compensation differs between conscious and anesthetized states. Chest compression impacts breathing differently, affecting tidal volume and respiratory rate, especially under heavy loads in conscious individuals.
Area of Science:
- Physiology
- Respiratory Medicine
Background:
- Chest compression can alter respiratory mechanics.
- Understanding respiratory compensation is crucial for managing respiratory distress.
Purpose of the Study:
- To investigate differences in respiratory compensation for chest compression between conscious and anesthetized states.
- To analyze the impact of varying chest compression levels on respiratory parameters.
Main Methods:
- Eight conscious and eight anesthetized subjects were subjected to controlled chest compression using a pneumatic cuff at 25, 50, and 100 mm Hg for 5 minutes.
- Respiratory frequency (f), tidal volume (VT), inspiratory time (T1), expiratory time (TE), minute ventilation (VI), and end-tidal PCO2 (PETCO2) were measured.
Main Results:
- Chest compression decreased VT and increased f in both states, with effects more pronounced at higher compression levels.
- In conscious subjects, increased f resulted from shortened T1 and TE; in anesthetized subjects, only TE shortened.
- Conscious subjects showed increased VI and decreased PETCO2 during heavy compression, unlike anesthetized subjects.
Conclusions:
- Respiratory compensation for chest compression is state-dependent, differing significantly between conscious and anesthetized individuals.
- The mechanisms of respiratory rate adjustment vary based on the level of consciousness and compression intensity.