Document Detail

Diminished hypoxic ventilatory responses in near-miss sudden infant death syndrome.
MedLine Citation:
PMID:  7263394     Owner:  NLM     Status:  MEDLINE    
The ventilatory response to hypoxia and to hypercarbia was assessed in 36 near-miss sudden infant death syndrome (N.M SIDS) and 23 control infants. Base-line measurements during non-REM sleep documented no significant difference in respiratory frequency, alveolar CO2 and O2 partial pressure (PAco2 and PAo2) or tidal volume between the N-M SIDS and control infants. In the N.M SIDS group, mean inspiratory flow and minute ventilation (VI) were significantly lower than in the control group (p less than 0.001 and p less than 0.01, respectively), and the slope of the ventilatory response to hypercarbia ((delta VI/Torr Paco2) was only 21 +/- 1.9 (SE) min-1 Torr PAco2 compared with 62 +/- 3.5 in controls (p less than 0.001). For both groups, the increase in ventilation with hypoxia appeared linear within the PAo2 range assessed (65-115 Torr) and was therefore expressed as the slope of the delta VI/PAo2 plot ( min-1 per Torr PAo2). The slope of the hypoxic ventilatory response was significantly less in the N-M SIDS than in the control group, -8.3 +/- 1.0 VS. -19.9 +/- 1.5, respectively (p less than 0.001). In summary, in comparison to control infants, N-M SIDS infants as a group have a significantly smaller increase in VI in response to hypoxia as well as to hypercarbia.
C E Hunt; K McCulloch; R T Brouillette
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  50     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1981 Jun 
Date Detail:
Created Date:  1981-10-25     Completed Date:  1981-10-25     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1313-7     Citation Subset:  IM    
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MeSH Terms
Anoxia / physiopathology*
Arousal / physiology
Gastroesophageal Reflux / physiopathology*
Lung / physiology
Sleep / physiology
Sudden Infant Death / physiopathology*
Tidal Volume
Grant Support
Reg. No./Substance:

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