Which of the following is a risk factor for late decelerations related to uteroplacental factors?

The presence of tachysystole is closely associated with late decelerations due to uteroplacental insufficiency. Tachysystole refers to an increased frequency of contractions, which can reduce blood flow and oxygen supply to the fetus by impairing uteroplacental perfusion. When the uterus is contracting too frequently or intensely, it doesn't allow enough time for the placenta to refill with blood and deliver oxygen to the fetus effectively.

Late decelerations are characterized by a decrease in fetal heart rate that begins after the peak of a contraction and returns to baseline after the contraction ends. This pattern can be indicative of placental insufficiency where the fetus is experiencing a lack of adequate blood flow and oxygenation, often exacerbated by excessive uterine activity as seen in tachysystole.

In contrast, conditions like oligohydramnios (low amniotic fluid), umbilical cord compression, and maternal seizures do not directly cause late decelerations that are specifically related to uteroplacental insufficiency in the same manner. Oligohydramnios might increase the risk of other complications, but it doesn't directly lead to the uteroplacental factor that causes late decelerations. Umbilical cord compression typically relates