Obstetrics Book

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Fetal Heart Tone Sinusoidal Pattern

Aka: Fetal Heart Tone Sinusoidal Pattern, FHT Sinusoidal Pattern, FHR Sinusoidal Pattern, FHR Pseudo-sinusoidal Pattern
  1. See Also
    1. Fetal Assessment
    2. Fetal Testing Indications
    3. Fetal Heart Tracing
  2. Definition
    1. Smooth undulating sine wave pattern
    2. Amplitude: 10 to 15 bpm
    3. Frequency: 3-5 cycles per minute
    4. Duration: >2 minutes
  3. 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
  4. Differential Diagnosis
    1. Pseudo-sinusoidal FHR pattern
      1. Appears similar to sinusoidal pattern
      2. Short-term variability present
      3. Benign finding
  5. 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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