Comprehensive and Detailed Explanation From Exact Extract–Based NCC C-EFM References:
An early deceleration is defined by NICHD and NCC as a gradual decrease and return of the fetal heart rate associated with uterine contractions. NCC emphasizes that early decelerations are:
Symmetrical
Uniform in shape
Mirror images of the contraction
This means:
Onset of deceleration = onset of contraction
Nadir of deceleration = peak of contraction
Recovery = end of contraction
Duration of the deceleration ≈ duration of the contraction
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