First trimester bradycardia. A sign of impending fetal loss. | Zendy

Laboda L A | Zendy; Estroff J A | Zendy; Benacerraf B R | Zendy

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First trimester bradycardia. A sign of impending fetal loss.

Author(s) -

Laboda L A,

Estroff J A,

Benacerraf B R

Publication year - 1989

Publication title -

journal of ultrasound in medicine

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.574

H-Index - 91

eISSN - 1550-9613

pISSN - 0278-4297

DOI - 10.7863/jum.1989.8.10.561

Subject(s) - medicine , bradycardia , first trimester , miscarriage , pregnancy , fetus , obstetrics , fetal heart rate , fetal heart , heart rate , cardiology , blood pressure , biology , genetics

Normal first trimester fetal heart rates rise from an average of 100 beats per minute (bpm) at 5 to 6 weeks to 140 bpm at 8 to 9 weeks. The heart rates of 65 consecutive first trimester fetuses between 5+ and 8+ weeks were measured to determine whether unusually slow first trimester fetal heartbeats are associated with a poor outcome. All five pregnancies in which heart rates were below 85 ended in spontaneous miscarriage. This study suggests that first trimester bradycardia may be associated with a poor prognosis for the pregnancy.

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