Early Deceleration

**Semantic type:** Finding

**Definition:** A gradual decrease in the fetal heart rate and return to baseline that is associated with a uterine contraction. The nadir of the deceleration occurs at the same time as the peak of the uterine contraction, and the time from onset to nadir of the deceleration is greater than or equal to 30 seconds.

**Synonyms:** - Early Fetal Heart Deceleration - Early Fetal Heart Rate Deceleration - Early Fetal Heart Rate Deceleration