Document Detail

Laryngeal and pump muscle activities during CO2 breathing in neonates.
MedLine Citation:
PMID:  8376294     Owner:  NLM     Status:  MEDLINE    
Term human newborns were challenged with a 2-3% CO2 gas mixture during quiet sleep. A common ventilatory response, consisting of increased tidal volume with no change in respiratory frequency or timing, was observed in all eight subjects. Minute ventilation and mean inspiratory and expiratory flow rates were elevated in all eight subjects [38 +/- 8 (SE), 38 +/- 22, and 39 +/- 9%, respectively]. Diaphragm, intercostal, and posterior cricoarytenoid (PCA) muscle activities during inspiration were increased in four of eight, six of eight, and seven of eight subjects, respectively Changes in intercostal and PCA muscle activities correlated with changes in inspiratory flow rates (r = 0.77 and 0.66, respectively). Diaphragmatic braking of expiratory airflow varied between subjects during room air breathing and did not change in six subjects with CO2 breathing. The remaining two subjects increased postinspiratory inspiratory diaphragmatic activity. Baseline expiratory PCA activity was augmented with CO2 breathing in six of eight subjects and correlated with increases in mean expiratory airflow (r = 0.76). The newborn infant is capable of using a variety of breathing strategies to augment tidal volume and minute ventilation, and control of the upper airway appears to be critical in modulating airflow during CO2 breathing.
J A Wozniak; A A Hutchison; P C Kosch
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  75     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1993 Jul 
Date Detail:
Created Date:  1993-10-19     Completed Date:  1993-10-19     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:  416-23     Citation Subset:  IM    
Department of Pediatrics, College of Medicine, University of Florida, Gainesville 32610.
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MeSH Terms
Abdominal Muscles / drug effects,  physiology
Carbon Dioxide / pharmacology*
Esophagus / drug effects,  physiology
Infant, Newborn
Laryngeal Muscles / drug effects,  physiology*
Models, Biological
Respiratory Mechanics / drug effects,  physiology
Respiratory Muscles / drug effects,  physiology*
Tidal Volume / physiology
Grant Support
R01-HL-28617-06/HL/NHLBI NIH HHS
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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