Document Detail


Reliability of CO2 measurements from the airway by a pharyngeal catheter in unintubated, spontaneously breathing subjects.
MedLine Citation:
PMID:  7572014     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Although several short communications have appeared describing attempts to record the concentrations of carbon dioxide (cCO2) from the unintubated airway by a catheter placed in the nose, so far only few reports have documented the reliability of the method. To evaluate the reliability of CO2 measurements by a catheter in the open, unintubated airway during spontaneous respiration, a 12 CH PVC catheter was forwarded through the nostril to the hypopharynx and connected to a capnograph in nine healthy volunteers. Another capnograph was connected to a tightly fitting face mask and simultaneous CO2 recordings were attained from the two parts of the airway during normoventilation, hyperventilation and rebreathing. A corresponding blood sample was drawn from the radial artery for blood gas analysis. The configurations of the capnograms recorded from the pharyngeal catheter were similar to those recorded from the face mask. The results were analysed by a multifactor analysis of variance. The carbon dioxide tension (pCO2) was significantly influenced by degree of ventilation (P < 0.0001), subject (P < 0.0001), measurement site (P = 0.030) and interaction subject-ventilation (P = 0.015). In spite of the significant influence of the measurement site, the difference between end tidal carbon dioxide tension (pCO2(ET)) and carbon dioxide tension in arterial blood (pCO2(a)) was small. The mean differences between paired measurements (pCO2(ET)-pCO2(a)) were -0.10 kPa +/- 0.41 kPa (mean +/- SD) for the catheter and -0.20 kPa +/- 0.43 kPa for the face mask. The study demonstrates that reliable recordings of CO2 concentrations during spontaneous respiration can be obtained by a thin catheter positioned in the hypopharynx.
Authors:
T Waldau; B Oberg; V H Larsen
Related Documents :
16626764 - Air hunger and ventilation in response to hypercapnia: effects of repetition and anxiety.
6769104 - Arterial and mixed venous blood gas tensions in exercising ducks.
9506004 - Effects of theophylline on respiratory drive in patients with chronic obstructive pulmo...
6815754 - The effect of body warming on the ventilatory response to co2 in the awake dog.
866084 - Eeg, measures of complexity, and preference for nonrepresentational works of art.
1213974 - Effect of exercise and thermal stress on plasma volume.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  39     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  1995 Jul 
Date Detail:
Created Date:  1995-11-09     Completed Date:  1995-11-09     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  637-42     Citation Subset:  IM    
Affiliation:
Department of Anaesthesiology, Copenhagen University Hospital, Herlev, Denmark.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Carbon Dioxide / analysis*
Catheterization
Female
Humans
Male
Masks
Middle Aged
Pharynx
Respiratory System / chemistry*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

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


Previous Document:  Premedication with sublingual buprenorphine for out-patient arthroscopy: reduced need for postoperat...
Next Document:  Peroperative and immediate postoperative adverse events in patients undergoing elective general and ...