| Oral-nasal membranes are not the major route for fetal absorption of amniotic fluid arginine vasopressin. | |
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MedLine Citation:
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PMID: 1750454 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Intraamniotically injected substances such as arginine vasopressin and digoxin have been found to rapidly appear in the ovine fetal circulation, irrespective of whether the fetal esophagus has been ligated or occluded. To determine if the ovine fetal oral-nasal membrane plays a significant role in this fetal absorption of amniotic substances, we used two groups of chronically catheterized fetal sheep with a surgical glove sewed over the fetal head to prevent access of the head to amniotic fluid. In the first group 22.5 micrograms of arginine vasopressin was injected into the amniotic cavity; in the second group 22.5 micrograms was injected into the glove over the fetal head. We found that, after injection into the amniotic cavity, there were rapid and highly significant increases in amniotic fluid arginine vasopressin concentrations, from 6.1 +/- 1.3 to 51,249 +/- 18,182 pg/ml (mean +/- SE) (p less than 0.00001). Concurrently there was a rapid increase in fetal plasma arginine vasopressin concentrations from 4.5 +/- 1.3 to 93.8 +/- 18.9 pg/ml (p less than 0.00001). The increase was significant within 15 minutes and reached a maximum at 60 minutes after the injection. Fetal arterial pressure increased by 10 +/- 2 mm Hg, whereas heart rate decreased by 30 +/- 5 beats/min (p less than 0.00001). In contrast, after the injection into the glove covering the fetal head, there were no significant changes in any of the measured parameters. This suggests that the ovine fetal oral-nasal membrane is not a significant route of absorption of amniotic fluid arginine vasopressin and that the most likely route of absorption is the vascularized fetal surface of the placenta and vascularized fetal membranes, i.e., the intramembranous pathway. |
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Authors:
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W M Gilbert; C Y Cheung; R A Brace |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: American journal of obstetrics and gynecology Volume: 165 ISSN: 0002-9378 ISO Abbreviation: Am. J. Obstet. Gynecol. Publication Date: 1991 Dec |
Date Detail:
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Created Date: 1992-01-23 Completed Date: 1992-01-23 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0370476 Medline TA: Am J Obstet Gynecol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1614-20 Citation Subset: AIM; IM |
Affiliation:
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Department of Reproductive Medicine, University of California, San Diego. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Absorption Amniotic Fluid / metabolism* Animals Arginine Vasopressin / administration & dosage, blood, pharmacokinetics* Blood Pressure / drug effects Female Heart Rate, Fetal / drug effects Mouth Mucosa / metabolism* Nasal Mucosa / metabolism* Pregnancy Sheep |
| Grant Support | |
ID/Acronym/Agency:
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HD20299/HD/NICHD NIH HHS; HD23724/HD/NICHD NIH HHS |
| Chemical | |
Reg. No./Substance:
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113-79-1/Arginine Vasopressin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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