Changes in the intracuff pressure of the laryngeal masks airway caused by repeated use

Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie
E Figueredo

Abstract

To observe the changes in permeability and elasticity in the cuff of the laryngeal mask airway (LMA) caused by repeated use. In vitro use was simulated on six # 4 LMAs on 140 occasions. Ambient air was insufflated into the cuff until a value of 200 mmHg intracuff pressure (ICP) was reached, and this was maintained for 50 min. After each simulation, the LMA was sterilized at 121 degrees C for 20 min. After every 20 simulations insufflation of 40 ml air was carried out to determine the maximum value of ICP (initial ICP), and after three hours, spontaneous deflation (final ICP) was measured. The values of initial and final ICPs throughout the eight tests were attributed to the elastance and the permeability of the cuff respectively. At the end of the study the thickness of the wall of the cuffs was measured using an optical microscope. The initial ICP with the new LMA (first test) was of 191 +/- 4.4 mmHg. This value increased from the fifth test onwards until the end of the study. The value of the final ICP in the first test was 111 +/- 3 mmHg and decreased with successive sterilizations. Between 80 and 100 simulations, initial ICP increased from 186.5 +/- 2.9 to 191.7 +/- 2.3 (P = 0.006). The thickness of the wall (694 +/- 17 mic...Continue Reading

References

May 1, 1992·Journal of Clinical Anesthesia·A I McEwan, D G Mason
Aug 1, 1994·Anesthesia and Analgesia·J R Brimacombe
Jul 1, 1994·Anesthesia and Analgesia·A I Brain
Jul 1, 1994·Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie·J Brimacombe, A Berry
Jul 1, 1993·Anesthesiology·J H Pennant, P F White
Nov 1, 1993·Anesthesia and Analgesia·P Biro
Feb 1, 1996·Acta Anaesthesiologica Scandinavica·J Brimacombe, A Berry
Aug 1, 1997·Journal of Clinical Anesthesia·L I WatS Gee
Apr 21, 1999·Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie·E FigueredoF Muñoz-Blanco

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Citations

Jan 7, 2004·Clinical Colorectal Cancer·Heather-Jane AuAnthony L A Fields
May 8, 2009·Acta Anaesthesiologica Scandinavica·R Sinha, R Sunder
Jul 28, 2005·European Journal of Anaesthesiology·L BannonC Keller
Jul 28, 2005·European Journal of Anaesthesiology·D ThangathuraiA Bohorguez
Apr 12, 2012·Anesthesia and Analgesia·Matthew EckelmanJodi Sherman
Jan 28, 2005·Anesthesia and Analgesia·Sarah DoneleyAchim von Goedecke

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