| Intratracheal administration of pulmonary vasodilator agents. | |
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MedLine Citation:
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PMID: 1437355 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We compared intravenous and intratracheal administration of histamine (0.4 and 1.6 micrograms/kg, respectively) and nitroglycerin (5.0 and 20.0 micrograms/kg, respectively) in seven hypoxemic 2 week old lambs, during right lung only perfusion, to see if intratracheal administration could limit their vasodilator action to the pulmonary vessels. The hemodynamic variables: pulmonary artery pressure (Ppa), left atrial pressure (Pla), pulmonary blood flow per kilogram (Q/kg), and aortic pressure (Pao) were measured at baseline and in each experimental state, then pulmonary vascular resistance (PVR) and systemic vascular input resistance (SVR) were determined. We found that intravenous histamine showed some pulmonary vasodilator selectivity in that it caused a 19% decrease of Ppa from baseline (P less than 0.002), a 23% decrease of PVR from baseline (P less than 0.002), and an 8% decrease of SVR from baseline (P less than 0.05). Intratracheal histamine produced smaller effects, decreasing Ppa by 11% from baseline (P less than 0.02), and PVR by 14% from baseline (P less than 0.02), while SVR was unaffected. Intravenous nitroglycerin decreased cardiac output by 16% from baseline (P less than 0.02), and also decreased SVR by 8% while producing a small increase in PVR. Intratracheal nitroglycerin caused a similar 17% (P less than 0.01) decrease in cardiac output, and again an increased PVR but a decreased SVR. This study confirms that histamine has some intrinsic pulmonary vasodilator selectivity. Furthermore, the data suggest that intratracheal administration may accentuate pulmonary selectivity by lessening systemic effects. Nitroglycerin, on the other hand, had untoward hemodynamic effects in the presence of hypoxia. |
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Authors:
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M A D'Angeli; B W Goetzman |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Pediatric pulmonology Volume: 14 ISSN: 8755-6863 ISO Abbreviation: Pediatr. Pulmonol. Publication Date: 1992 Oct |
Date Detail:
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Created Date: 1992-12-01 Completed Date: 1992-12-01 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8510590 Medline TA: Pediatr Pulmonol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 85-90 Citation Subset: IM |
Affiliation:
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Department of Pediatrics, School of Medicine, University of California, Davis 95616. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Animals, Newborn Anoxia / physiopathology Epinephrine / administration & dosage, pharmacology Hemodynamics / drug effects Histamine / administration & dosage*, analysis, pharmacology Injections, Intravenous Intubation, Intratracheal Lung / blood supply*, chemistry Nitroglycerin / administration & dosage*, analysis, pharmacology Sheep Vascular Resistance / drug effects* Vasodilation / drug effects* |
| Chemical | |
Reg. No./Substance:
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51-43-4/Epinephrine; 51-45-6/Histamine; 55-63-0/Nitroglycerin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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