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The Annals of Thoracic Surgery, Vol 20, 144-151, Copyright © 1975 by The Society of Thoracic Surgeons
TH Stanley and WS Liu
The effects of oxygen and 60% nitrous oxide and oxygen on the pressure and
volume of Portex low-pressure (LP) and high-pressure (HP) endotracheal tube
cuffs were determined in 120 intubated patients undergoing thoracic
surgical procedures. Cuffs were filled with either room air or a sample of
the inspired gases. All cuffs had sustained significant increases in cuff
volume and pressure by the end of the procedure except those filled with
inspired gases. LP cuffs had lower initial and final cuff pressures than HP
cuffs, but pressure and volume changes were similar with both types. Cuff
gas analysis revealed that cuff volume changes were due to diffusion of
oxygen and nitrous oxide into the cuff and failure of nitrogen to diffuse
out. These findings suggest that cuff overexpansion during anesthesia or
prolonged ventilation may be an important cause of tracheal trauma.
ARTICLES
Tracheostomy and endotracheal tube cuff volume and pressure changes during thoracic operations
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