Increased variability of fetal heart rate might be caused by:
1. narcotics.
2. barbiturates.
3. methamphetamines.
4. tranquilizers.
3
1, 2, 4. Incorrect. Narcotics, barbiturates, and tranquilizers might be causes of decreased variabil-ity; methamphetamines might cause increased variability.
3. Correct. Narcotics, barbiturates, and tranquilizers might be causes of decreased variability; methamphetamines might cause increased variability.
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