Document Detail


Monitoring breathing in avian embryos and hatchlings by the barometric technique.
MedLine Citation:
PMID:  17825629     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This communication describes the application of the barometric technique to the measurements of the breathing pattern (tidal volume and breathing rate) and pulmonary ventilation (VE) in chicken embryos and hatchlings. The chamber-plethysmograph was separated into two sections, an animal compartment, maintained at incubation temperature, and a recording compartment kept at a lower temperature. In the case of the embryos, the eggshell itself represented the animal compartment. The hatchlings were accommodated into a "nest" compartment. A flow-through system permitted simultaneous measurements of oxygen consumption (VO2) and carbon dioxide production. Values of breathing rate corresponded to those counted visually in hatchlings while resting in the incubator, and data of resting VE were similar to those obtained by airflow plethysmography, a more invasive technique applicable only to the hatchlings. At rest, the ventilatory equivalent (VE/VO2) of the hatchlings was similar to that reported for adult birds, while in embryos it was much lower. Hypoxia (15 and 10% O2) and hypercapnia (2 and 4% CO2) caused hyperventilation (increase in VE/VO2), both in the hatchlings and in the embryos, these latter using hypometabolism as the main approach to hyperventilate in hypoxia. We conclude that the barometric technique can be adapted to the study of breathing and VE responses in avian embryos and hatchlings.
Authors:
Kirsten Szdzuy; Jacopo P Mortola
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Publication Detail:
Type:  Journal Article     Date:  2007-07-22
Journal Detail:
Title:  Respiratory physiology & neurobiology     Volume:  159     ISSN:  1569-9048     ISO Abbreviation:  Respir Physiol Neurobiol     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-10-22     Completed Date:  2008-02-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101140022     Medline TA:  Respir Physiol Neurobiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  241-4     Citation Subset:  IM    
Affiliation:
Department of Physiology, McGill University, 3655 Promenade Sir William Osler, Montreal, Quebec H3G 1Y6, Canada.
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Newborn
Anoxia / metabolism,  physiopathology
Carbon Dioxide / metabolism
Chick Embryo / physiology*
Hypercapnia / physiopathology
Monitoring, Physiologic
Oxygen Consumption / physiology
Pulmonary Ventilation / physiology*
Respiration*
Tidal Volume / physiology*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

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


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