Document Detail

Resistive load of laryngeal mask airway and ProSeal laryngeal mask airway in mechanically ventilated patients.
MedLine Citation:
PMID:  12803596     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The ProSeal Laryngeal Mask Airway (PLMA) ventilation tube is narrower and shorter than the standard Laryngeal Mask Airway (LMA) and is without the vertical bars at the end of the tube. In this randomized, crossover study, PLMA and LMA resistances were compared. METHODS: Respiratory mechanics was calculated in 26 anesthetized, mechanically ventilated patients with both LMA and PLMA. The laryngeal mask positioning was fiberoptically evaluated. Differences in the respiratory mechanics of the LMA and the PLMA were attributed to the differences between the laryngeal masks. RESULTS: In the total study population the airway resistance was 1.5 +/- 2.6 hPa.l-1.s-1 (P = 0.005) higher with the PLMA than with the LMA. During the PLMA use, the peak expiratory flow reduced by 0.02 +/- 0.05 l min-1 (P = 0.046), the expiratory resistance increased by 0.6 +/- 1.3 hPa.l-1.s-1 (P = 0.022), and the time constant of respiratory system lengthened by 0.09 +/- 0.18 s (P = 0.023). These differences doubled when the LMA was better positioned than the PLMA, whereas they disappeared when the PLMA was positioned better than the LMA. CONCLUSIONS: The standard LMA offers a lower resistive load than the PLMA. Moreover, the fitting between the laryngeal masks and the larynx, as fiberoptically evaluated, plays a major role in determining the resistive properties of these devices.
G Natalini; A Rosano; G Lanza; E Martinelli; C Pletti; A Bernardini
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  47     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-06-13     Completed Date:  2003-10-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  761-4     Citation Subset:  IM    
Department of Anesthesia, Intensive Care and Emergency, Casa di Cura Poliambulanza, Brescia, Italy.
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MeSH Terms
Air Pressure
Airway Resistance / physiology
Anesthesia, General
Cross-Over Studies
Laryngeal Masks*
Positive-Pressure Respiration
Respiration, Artificial*
Respiratory Mechanics / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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