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FETAL HEART RATES AS DETERMINED BY SONAR IN EARLY PREGNANCY
Author(s) -
Robinson Hugh P.,
ShawDunn John
Publication year - 1973
Publication title -
bjog: an international journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.157
H-Index - 164
eISSN - 1471-0528
pISSN - 1470-0328
DOI - 10.1111/j.1471-0528.1973.tb11222.x
Subject(s) - fetal heart , heart rate , medicine , fetal heart rate , fetus , pregnancy , ultrasound , cardiology , abortion , obstetrics , biology , blood pressure , genetics , radiology
Summary Using a pulsed ultrasound technique, the human fetal heart rate was studied between 45 days and 15 weeks after the first day of the last menstrual period. The heart rate rose from a level of 123 beats per minute at 45 days to a peak of 177 beats per minute at 9 weeks, and then gradually fell to a value of 147 beats per minute at 15 weeks. In cases of threatened abortion the fetal heart rates were not statistically different from those in normal pregnancies. The changes in heart rate were correlated with the morphological and physiological changes which occur in the fetal heart during this period.