| The effect of position and delay on stroke and minute distance in late pregnancy. | |
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MedLine Citation:
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PMID: 3304399 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Stroke and minute distance were measured in 12 women in late pregnancy using Doppler ultrasound. In each patient two sets of measurements were made every 2 min for 20 min in the supine and left lateral positions, the sequence of positions being reversed on the second occasion. Within each of the four 20 min measurement periods there were no significant changes with time in stroke distance, heart rate, or minute distance, or in their coefficients of variation. From this evidence there is no justification for delaying the measurement of cardiac output until a 'steady state' is reached. The measurements were influenced both by the sequence and the position in which they were taken, the effects being additive. Overall, stroke distance was 5.1% greater in the left lateral than in the supine position, heart rate was 3.7% less and minute distance not significantly different. Independent of posture, stroke distance was 6.5% greater in the second period of measurement than in the first, heart rate was 3% less and minute distance 2.8% more. In late pregnancy the relative magnitude of cardiac output in the left lateral and supine positions has to be interpreted in the light of a stepwise increase of aortic blood flow with change of posture. |
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Authors:
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J M Rawles; K T Schneider; R Huch; A Huch |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: British journal of obstetrics and gynaecology Volume: 94 ISSN: 0306-5456 ISO Abbreviation: Br J Obstet Gynaecol Publication Date: 1987 Jun |
Date Detail:
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Created Date: 1987-09-30 Completed Date: 1987-09-30 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 7503752 Medline TA: Br J Obstet Gynaecol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 507-11 Citation Subset: AIM; IM |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aorta / physiology Blood Flow Velocity Cardiac Output* Female Heart Rate Humans Posture Pregnancy / physiology* Pregnancy Trimester, Third Stroke Volume Time Factors Ultrasonography |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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