Document Detail


Upper airway extraluminal tissue pressure fluctuations during breathing in rabbits.
MedLine Citation:
PMID:  12832428     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Transmural pressure at any level in the upper airway is dependent on the difference between intraluminal airway and extraluminal tissue pressure (ETP). We hypothesized that ETP would be influenced by topography, head and neck position, resistive loading, and stimulated breathing. Twenty-eight male, New Zealand White, anesthetized, spontaneously breathing rabbits breathed via a face mask with attached pneumotachograph to measure airflow and pressure transducer to monitor mask pressure. Tidal volume was measured via integration of the airflow signal. ETP was measured with a pressure transducer-tipped catheter inserted in the tissues of the lateral (ETPlat, n = 28) and anterior (ETPant, n = 21) pharyngeal wall. Head position was controlled at 30, 50, or 70 degrees, and the effect of addition of an external resistor, brief occlusion, or stimulated breathing was examined. Mean ETPlat was approximately 0.7 cmH2O greater than mean ETPant when adjusted for degree of head and neck flexion (P < 0.05). Mean, maximum, and minimum ETP values increased significantly by 0.7-0.8 cmH2O/20 degrees of head and neck flexion when adjusted for site of measurement (P < 0.0001). The main effect of resistive loading and occlusion was an increase in the change in ETPlat (maximum - minimum ETPlat) and change in ETPant at all head and neck positions (P < 0.05). Mean ETPlat and ETPant increased with increasing tidal volume at head and neck position of 30 degrees (all P < 0.05). In conclusion, ETP was nonhomogeneously distributed around the upper airway and increased with both increasing head and neck flexion and increasing tidal volume. Brief airway occlusion increased the size of respiratory-related ETP fluctuations in upper airway ETP.
Authors:
Kristina Kairaitis; Radha Parikh; Rosie Stavrinou; Sarah Garlick; Jason P Kirkness; John R Wheatley; Terence C Amis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-06-27
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  95     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2003 Oct 
Date Detail:
Created Date:  2003-09-12     Completed Date:  2004-04-28     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1560-6     Citation Subset:  IM    
Affiliation:
Dept. of Respiratory Medicine, Westmead Hospital, Hawkesbury Rd., Westmead NSW 2145, Australia. kristinak@westgate.wh.usyd.edu.au
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MeSH Terms
Descriptor/Qualifier:
Airway Obstruction / physiopathology
Airway Resistance / physiology
Animals
Exhalation / physiology
Head
Hypercapnia / physiopathology
Hyperventilation / physiopathology
Inhalation / physiology
Male
Muscle, Skeletal / physiology
Neck
Pharynx / physiology*,  physiopathology
Pressure
Rabbits
Respiratory Physiological Phenomena*
Tidal Volume

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


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