The fetal heart monitor tracing in pregnancies complicated by fetal thyrotoxicosis

Craig Towers, Steven Thomas, Ralph M. Steiger

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Fetal tachycardia caused by the transplacental passage of thyroid stimulating immunoglobulin is well established, but very little information exists regarding the fetal heart rate appearance of this form of tachycardia. Two cases of fetal tachycardia are described in pregnancies complicated by fetal thyrotoxicosis where maternal thyroid history was unknown at the time of testing. For each pregnancy, the fetal heart monitor tracing is depicted and described. In both cases, the initial fetal heart rate pattern demonstrated a sustained baseline of 170 to 180 beats per minute with moderate variability that exhibited accelerations with a lack of decelerations. The tracings were essentially normal except for the baseline rate. When reviewing the differential for fetal tachycardia presenting in the antenatal period, this pattern is unique to fetal thyrotoxicosis, especially if the mother is afebrile and there is no history of medication usage that could explain this presentation.

Original languageEnglish (US)
Pages (from-to)373-377
Number of pages5
JournalAmerican Journal of Perinatology
Volume26
Issue number5
DOIs
StatePublished - May 1 2009
Externally publishedYes

Fingerprint

Fetal Heart
Thyrotoxicosis
Tachycardia
Pregnancy
Fetal Heart Rate
Thyroid-Stimulating Immunoglobulins
Deceleration
Thyroid Gland
History
Mothers

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Obstetrics and Gynecology

Cite this

The fetal heart monitor tracing in pregnancies complicated by fetal thyrotoxicosis. / Towers, Craig; Thomas, Steven; Steiger, Ralph M.

In: American Journal of Perinatology, Vol. 26, No. 5, 01.05.2009, p. 373-377.

Research output: Contribution to journalArticle

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