A member asked:

What is the definition or description of: abnormal fetal heart rate?

5 doctors weighed in across 3 answers
Dr. Dennis Higginbotham answered

Specializes in American Board of Obstetrics and Gynecology

Varies: The normal fetal heart rate throughout pregnancy ranges from 110 beats per minute to 170 beats per minute. In labor the fetal heart rate should still be in that range but is often considered abnormal when decelerations are occuring

Answered 7/26/2016

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Fetal HR: The changes in the fetal heart rate pattern, which usually are detected by fetal heart rate monitor (efm) that suggest that there may be a physiologic response to the normal labor or ongoing distress. Fhr undergoes constant adjustments in response to the fetal environment or stimuli. Fhr patterns are classified as reassuring, non reassuring or ominous.Efm was introduced in 1958 in yale university.

Answered 1/6/2013

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Dr. Nikolaos Zacharias answered

Specializes in Maternal-Fetal Medicine

<110, or >160 bpm.: After the first trimester, the fetal heart rate should fluctuate between 110-160 beats per minute. Arrhythmias (skipped beats, tachy-/brady-arrhythmias) account for most pre-labor abnormal heart rates. Intrapartum fetal heart rate depends on fetal oxygenation and placental perfusion and is used to prevent death of brain injury during labor. Decelerations may be early, variable or late.

Answered 12/9/2013

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