What maternal condition is NOT associated with late decelerations?

Late decelerations in fetal heart rate monitoring are typically associated with conditions that can affect uteroplacental perfusion, leading to a decrease in oxygen delivery to the fetus during contractions. These conditions often include issues like maternal hypotension or hypovolemia, which can impair blood flow to the placenta, resulting in late decelerations.

Severe migraines may cause discomfort and stress but are not directly linked to the physiological changes that affect fetal heart rate patterns. Unlike the other conditions, which relate to blood flow or placental function, severe migraines do not have a clear pathophysiological mechanism that would result in late decelerations. Therefore, this makes it the condition least associated with late decelerations.

Asthma and hypotension are known to potentially influence fetal heart rate patterns, especially in the context of reduced oxygen delivery or compromised maternal health. Hypovolemia similarly impacts blood volume and circulation to the placenta, thus leading to the possibility of late decelerations occurring.