Late deceleration indicates (DNB June 2012)
a. Deceleration pattern - Three type
i. Early deceleration - due to head compression
ii. Late deceleration - chronic placental insufficiency
iii. Variable deceleration - cord compression
b. Sinusoidal pattern - It is stable baseline FHR with fixed base line variability without any acceleration. If is often associated with fetal anaemia, feto-maternal haemorrhage, fetal hypoxia, and when narcotics are given to mothers
c. In situations of uteroplacental insufficiency, the uterine contractions may decrease the placental perfusion sufficiently to cause fetal hypoxia which outlasts the duration of the contraction.
d. The FHR tracing shows decelerations which begin with the peak of the uterine contractions and persists even after the conclusion of the contraction (late deceleration), late decelerations are indicative of fetal compromise