What is the cause of early decelerations?
head compression
What is the cause of variable decelerations?
umbilical cord compression.
What is a variable deceleration?
decrease in HR and return to baseline with no relationshop to contractions
What is the cause of late decelerations?
fetal hypoxia
What is late deceleration?
decrease in HR after contraction started. no return to baseline until contraction ends
What are normal accelerations?
increase in HR of 15 or more beats per min above the HR baseline for longer than 15-20 secs. Happens twice in 20 mins.