fetal heart rate(redirected from Fetal Heart Tones)
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fe·tal heart rate (FHR),
in the fetus, the number of heartbeats per minute, normally 120-160.
fetal heart rate (FHR)
the number of heartbeats in the fetus that occur in a given unit of time. The FHR varies in cycles of fetal rest and activity and is affected by many factors, including maternal fever, uterine contractions, maternal-fetal hypotension, and many drugs. The normal FHR is between 110 beats/min and 160 beats/min. In labor the FHR is monitored with a fetoscope, an electronic fetal monitor for detecting abnormal alterations in the heart rate, especially recurrent decelerations that continue past the end of uterine contractions.
fetal heart rateObstetrics A rate which, in the non-stressed fetus, reflects cardioaccelerator and cardiodecelerator reflexes; analysis of the FHR requires evaluation of a baseline FHR between uterine contractions or periodic changes in the FHR and non-periodic, short-term fluctuations in the FHR. See Deceleration.
fe·tal heart rate(FHR) (fē'tăl hahrt rāt)
In the fetus, the number of heartbeats per minute, normally 120-160.