Obstetrics Book

Developmental Disorder


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. 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
  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]

You are currently viewing the original 'fpnotebook.com\legacy' version of this website. Internet Explorer 8.0 and older will automatically be redirected to this legacy version.

If you are using a modern web browser, you may instead navigate to the newer desktop version of fpnotebook. Another, mobile version is also available which should function on both newer and older web browsers.

Please Contact Me as you run across problems with any of these versions on the website.

Navigation Tree