Fetal surveillance - CST

Question 1

In contrast with NST, what does CST test?

Answer 1

• CST is a test of uteroplacental function
• NST is a test of fetal condition

Question 2

Can be performed when?

Answer 2

If the NST is nonreactive

Question 3

How done?

Answer 3

1. Lateral recumbent position
2. Contractions are stimulated

Question 4

Stimulating contractions

Answer 4

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

Question 5

Criteria for adequate contractions

Answer 5

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

Question 6

Interpretation of findings

Answer 6

• 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