Physiologic modulations of the systolic time intervals in the fetal lamb
作者:
Xavier De Muylder,
Jean-Claude Fouron,
Harry Bard,
Josée S. Lafond,
期刊:
Canadian Journal of Physiology and Pharmacology
(NRC Available online 1985)
卷期:
Volume 63,
issue 7
页码: 893-897
ISSN:0008-4212
年代: 1985
DOI:10.1139/y85-146
出版商: NRC Research Press
数据来源: NRC
摘要:
To examine the modulation of fetal systolic time intervals of the ovine fetus in relation to fetal maturation, heart rate, respiratory activity, and circadian rhythm, studies were carried out on 13 fetal–maternal sheep preparations. The data obtained showed that there was a significant correlation between the ejection time (ET) and the RR intervals of the electrocardiogram. The pre-ejection period (PEP) and PEP/ET increased in relation to the fetal maturation (38 ms and 0.25 at 120 days to 52 ms and 0.33 at 145 days of gestation, respectively). When the circadian rhythmicity was analyzed, a relative tachycardia was in evidence during the 21- to 03-h period but systolic time intervals remained unchanged. Except for some tachycardia and cardiac rhythm variability, respiratory activity also had no influence on the systolic time intervals.
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