The most common cause of decreased variability of the fetal heart rate (FHR) lasting 30 minutes or less is:
1. altered cerebral blood flow.
2. fetal hypoxemia.
3. umbilical cord compression.
4. fetal sleep cycles.
4
1. Incorrect. Altered fetal cerebral blood flow results in early decelerations in the FHR.
2. Incorrect. Fetal hypoxemia would be evident by tachycardia initially then bradycardia. There may be a persistent decrease or loss of FHR variability.
3. Incorrect. Umbilical cord compression results in variable decelerations of the FHR.
4. Correct. A temporary decrease in variability can occur when the fetus is in a sleep state. These sleep states do not usually last longer than 30 minutes.
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