Question

A 36 weeks pregnant woman has decreased fetal movements. NST shows 1 acceleration and no deceleration in 20 minutes. What is the next step?

• A. Emergency C-section
• B. Induce labor
• C. Wait and observe
• D. Continue NST for 40 min

Hint:

If NST is not reactive in 20 minutes, extend it to 40 minutes before labeling it non-reactive.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
A Non-Stress Test (NST) is reactive if there are at least 2 accelerations in 20 minutes. The question asks what to do when this criterion isn't quite met, but no distress is shown.
Step 2: Detailed Explanation:

Fetal Sleep Cycles: The most common reason for a non-reactive NST in a healthy fetus is that the baby is asleep. Fetal sleep cycles can normally last up to 40 minutes.

Evaluation of Current NST: The fetus had 1 acceleration, which is good, but doesn't meet the "Reactive" threshold of 2. There are no decelerations, so there is no immediate evidence of distress.

Management Protocol: If the first 20 minutes of monitoring are non-reactive, the standard next step is to extend the monitoring for another 20 minutes (total 40 minutes). This gives the fetus time to wake up naturally.

Other Options: You do not induce labor or perform a C-section for a single 20-minute non-reactive trace without other signs of distress.

Next Level Tests: If the NST remains non-reactive after 40 minutes, then a Biophysical Profile (BPP) or Contraction Stress Test (CST) should be performed.

Step 3: Final Answer:
The appropriate next step is to continue the NST for a total of 40 minutes to account for a possible fetal sleep cycle.