1. Early decelerations: due to fetal head compression during uterine contractions leading to fetal vagal stimulation leading to fetal bradycardia ( with fetal hr staying above 100bpm).
Lowest fetal heart rate- at peak of uterine contractions
2.
Late decelerations: due to dip in fetal heart rate due to fetal hypoxia during uterine contractions sign of uteroplacental insufficiency .
Lowest fetal HR- after peak of uterine contractions
3. Variable deceleration: poorly related to uterine contractions sign of umbilical cord compression- most serious
Lowest fetal hr- unrelated to uterine contractions
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Normal baseline variability- changes in heart rate <5bpm are normal
Loss of normal variability- drugs, fetal hypoxia
How to manage worrying decelerations- late, variable
1. Left lateral position of mother
2. Give mother supplemental oxygen
3. Tocolytic medications- terbutaline, magnesium, nitroglycerin
Lowest fetal heart rate- at peak of uterine contractions
2.
Late decelerations: due to dip in fetal heart rate due to fetal hypoxia during uterine contractions sign of uteroplacental insufficiency .
Lowest fetal HR- after peak of uterine contractions
3. Variable deceleration: poorly related to uterine contractions sign of umbilical cord compression- most serious
Lowest fetal hr- unrelated to uterine contractions
------------------------------------------
Normal baseline variability- changes in heart rate <5bpm are normal
Loss of normal variability- drugs, fetal hypoxia
How to manage worrying decelerations- late, variable
1. Left lateral position of mother
2. Give mother supplemental oxygen
3. Tocolytic medications- terbutaline, magnesium, nitroglycerin
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