Document Detail

A description of the preterm fetal sheep systemic and central responses to maternal general anesthesia.
MedLine Citation:
PMID:  17242098     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The second trimester is recommended as the optimal time to conduct a surgical procedure on pregnant patients, even though the fetal responses to anesthesia at this age are not known. Here we assessed the responses of preterm fetal sheep to a standard anesthetic regimen of midazolam, thiopental, and isoflurane. METHODS: Variables were monitored in previously instrumented preterm pregnant sheep before, during, and after 4 h of general anesthesia. Isoflurane produced moderate fetal hypotension and bradycardia, whereas extubation was accompanied by increases in fetal heart rate and mean arterial blood pressure. RESULTS: We observed an initial increase in fetal Sao2 followed by a gradual decline to baseline. Within the fetal brain, oxygenated hemoglobin changed by <10% (nonsignificant) and deoxygenated hemoglobin and total hemoglobin varied by <5%. Overall, although O2 levels within the preterm fetal brain were not independently enhanced by isoflurane (as occurs in the older fetus and in the adult), they did remain constant even as fetal mean arterial pressure decreased by more than 20%. By extension, we failed to identify changes in cerebral oxygenation that could be construed as injurious. CONCLUSION: Any adverse preterm fetal response to maternal surgery should not be attributed solely to the actions of general anesthesia upon the fetus.
Rebecca J McClaine; Kenichiro Uemura; Deborah J McClaine; Kazufumi Shimazutsu; Sebastian G de la Fuente; Roberto J Manson; William D White; William S Eubanks; Paul B Benni; James D Reynolds
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Anesthesia and analgesia     Volume:  104     ISSN:  1526-7598     ISO Abbreviation:  Anesth. Analg.     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-23     Completed Date:  2007-03-15     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  1310650     Medline TA:  Anesth Analg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  397-406     Citation Subset:  AIM; IM    
Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
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MeSH Terms
Anesthesia, General* / adverse effects,  methods
Blood Gas Analysis
Fetus / drug effects*,  physiology*
Isoflurane / administration & dosage,  adverse effects
Maternal-Fetal Exchange / drug effects*,  physiology*
Grant Support
Reg. No./Substance:

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