Fetal surveillance - CST Flashcards Preview

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Flashcards in Fetal surveillance - CST Deck (6)
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1
Q

In contrast with NST, what does CST test?

A
  • CST is a test of uteroplacental function
  • NST is a test of fetal condition
2
Q

Can be performed when?

A

If the NST is nonreactive

3
Q

How done?

A
  1. Lateral recumbent position
  2. Contractions are stimulated
4
Q

Stimulating contractions

A
  1. Administration of oxytocin (Pitocin)
  2. Nipple stimulation (2 min self-stimulation through clothes every 5 min)
5
Q

Criteria for adequate contractions

A
  1. Occur three times in 10 min.
  2. Lasting at least 40 sec.
  3. Moderate to palpation
6
Q

Interpretation of findings

A
  • As the presence or absence of late decelerations
    • Negative
      • No late or significant variable decelerations
    • Positive
      • Late decelerations following 50% or more of contractions
    • Equivocal-suspicious
      • Intermittent late decelerations or significant variable decelerations
    • Equivocal-hyperstimulatory
      • FHR decelerations that occur in the presence of contractions more frequent than every 2 minutes or lasting longer than 90 seconds
    • Unsatisfactory
      • Fewer than three contractions in 10 min