Final answer:
Fetal accelerations can be caused by uterine contractions, oxytocin administration, maternal fever, and external stimuli, which can impact the fetal heart rate beyond movements.
Step-by-step explanation:
The question refers to causes of fetal acceleration, which may include events leading to an increased heart rate in a fetus other than fetal movements. Four other causes of fetal accelerations could be:
- Uterine contractions: During birth, contractions can stimulate an increase in fetal heart rate.
- Oxytocin administration: This hormone, when given to induce labor, can cause accelerations in the fetal heart rate due to its effect on uterine contractions.
- Maternal fever: An elevated body temperature in the mother can also lead to an increase in fetal heart rate.
- External stimuli: Sounds or other sensations might lead to a momentary increase in the fetus's heart rate.
Severe accelerations that are too powerful or lengthy may prevent oxygenated blood from being restored to the fetus, potentially leading to an emergency birth.