| Relationship between mean airway pressure, cardiac output, and organ blood flow with normal and decreased respiratory compliance. | |
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MedLine Citation:
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PMID: 3110385 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We investigated the relation between blood flow and mean airway pressure in two groups of anesthetized newborn piglets. The first group had normal respiratory compliance; the second group had pulmonary surfactant depleted by repeated saline lavage, which decreased static respiratory compliance by 42%. In the normal group, cardiac output decreased linearly from 292 +/- 43 mL/min/kg at 5 cm H2O airway pressure to 134 +/- 37 ml/min/kg at 20 cm H2O airway pressure, a drop of 43% (r2 = 0.79). Blood flow to the heart, kidney, and intestines had a similar decline, but brain, hepatic artery, and adrenal flow were constant. Mean arterial blood pressure did not decrease significantly until the highest airway pressure was reached, whereas sagittal sinus pressure increased as mean airway pressure increased. In contrast, the surfactant-depleted group maintained cardiac output up to a mean airway pressure of 15 cm H2O. At 20 cm H2O, cardiac output fell to 40% of the original value. Blood flow to the heart and kidneys fell at a mean airway pressure of 20 cm H2O; intestinal blood flow decreased beginning at 10 cm H2O. As in the normal piglets, brain, hepatic arterial, and adrenal blood flow were not affected by increasing ventilation pressure. Our data show that positive pressure ventilation in the neonate has important cardiovascular effects that are blunted when respiratory compliance is decreased. More important, because cardiac output decreased prior to a significant decline in arterial blood pressure, these data suggest that in a clinical setting considerable cardiovascular alterations can occur before a decline in arterial blood pressure is detected. |
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Authors:
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R Mirro; D Busija; R Green; C Leffler |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of pediatrics Volume: 111 ISSN: 0022-3476 ISO Abbreviation: J. Pediatr. Publication Date: 1987 Jul |
Date Detail:
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Created Date: 1987-08-07 Completed Date: 1987-08-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0375410 Medline TA: J Pediatr Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 101-6 Citation Subset: AIM; IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Airway Resistance* Animals Animals, Newborn / physiology Blood Circulation* Blood Pressure Carbon Dioxide / blood Cardiac Output* Coronary Circulation Intestines / blood supply Lung Compliance* Oxygen / blood Positive-Pressure Respiration Pulmonary Surfactants / physiology Renal Circulation Swine |
| Chemical | |
Reg. No./Substance:
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0/Pulmonary Surfactants; 124-38-9/Carbon Dioxide; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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