Document Detail


Postnatal nicotine exposure does not further compromise hypoxia defense mechanisms in prenatally nicotine-exposed lambs.
MedLine Citation:
PMID:  15188985     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIMS: To determine whether combined pre- and postnatal nicotine exposure compared with prenatal exposure alone results in more compromised postnatal hypoxia defense mechanisms and further alteration of the postnatal breathing pattern (reduced tidal volume and increased respiratory rate). METHODS: Seven lambs exposed to nicotine prenatally (pN) (approximate maternal dose: 0.5 mg/kg/d) and seven lambs exposed to nicotine pre- and postnatally (ppN) (postnatal dose: 1.6-2 mg/kg/d) were studied without sedation at an average age of 5 d and 21 d during resting (room air) conditions, during exposure to 10% O2 and during a brief exposure to 100% O2. RESULTS: Resting minute ventilation, occlusion pressure, effective impedance, heart rate and mean arterial blood pressure were similar in the two groups during wakefulness and quiet sleep. Resting tidal volume was significantly higher in ppN than in pN lambs during wakefulness (9.4 +/- 0.7 vs 7.7 +/- 1.4 ml/kg, p < 0.05) and quiet sleep (9.8 +/- 0.6 vs 7.6 +/- 1.5 ml/kg, p < 0.01) at 5 d and also at 21 d during wakefulness (7.7 +/- 1.0 vs 6.2 +/- 1.1 ml/kg, p < 0.05). The ventilatory, heart rate and blood pressure responses to hypoxia were comparable in the two groups during both activity states. Time to arousal from quiet sleep in response to hypoxia was equivalent in the two groups. The ventilatory response to hyperoxia was not significantly different in the two groups during either activity state. CONCLUSION: Continued postnatal nicotine exposure after prenatal exposure did not further compromise hypoxia defense mechanisms after birth.
Authors:
O Hafström; J Milerad; H W Sundell
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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:  Acta paediatrica (Oslo, Norway : 1992)     Volume:  93     ISSN:  0803-5253     ISO Abbreviation:  Acta Paediatr.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-06-10     Completed Date:  2004-09-01     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9205968     Medline TA:  Acta Paediatr     Country:  Norway    
Other Details:
Languages:  eng     Pagination:  545-51     Citation Subset:  IM    
Affiliation:
Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-2585, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Newborn / physiology*
Anoxia / physiopathology*
Birth Weight
Blood Gas Analysis
Blood Pressure Determination
Female
Gestational Age
Heart Rate
Models, Animal
Nicotine / blood,  toxicity*
Pregnancy
Prenatal Exposure Delayed Effects*
Respiration / drug effects*
Respiratory Physiological Phenomena*
Sheep
Tidal Volume
Grant Support
ID/Acronym/Agency:
HD 28916/HD/NICHD NIH HHS; HL 14214/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
54-11-5/Nicotine

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


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