Fetal Heart Tone Sinusoidal Pattern

Aka: Fetal Heart Tone Sinusoidal Pattern, FHT Sinusoidal Pattern, FHR Sinusoidal Pattern, FHR Pseudo-sinusoidal Pattern

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II. Definitions

  1. Fetal Heart Tone Sinusoidal Pattern
    1. Smooth undulating sine wave pattern
    2. Amplitude: 10 to 15 bpm
    3. Frequency: 3-5 cycles per minute
    4. Duration: >2 minutes

III. Causes

  1. Ominous sign
    1. May represent terminal rhythm
    2. Requires immediate evaluation
  2. Severe fetal Anemia (e.g. Fetal hydrops)
  3. Maternal medications or Illicit Drugs

IV. Differential Diagnosis

  1. Pseudo-sinusoidal FHR pattern
    1. Appears similar to sinusoidal pattern
    2. Short-term variability present
    3. Benign finding

V. References

  1. Bailey (2000) ALSO, E:1-13
  2. Gabbe (2002) Obstetrics, p. 395
  3. Rylander (2001) Clin Fam Pract 3(2):287-305 [PubMed]

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