Intrapartum foetal monitoring Flashcards
1
Q
how sensitive and specific is CTG for fetal distress?
A
~50%
2
Q
how do you systematically assess a CTG
A
name
time
speed of trace
baseline
variability
accelerations
decelerations
contractions
3
Q
what is an accelerations?
A
increase in HR above baseline of at least 15 bpm for at least 15 seconds
4
Q
what are the causes of accelerations?
A
active behaviour
CNS
5
Q
absence of accelerations before labour - how long before abnormal?
A
1 hour
fetuses can sleep for 40 minutes
6
Q
what is the single most helpful variable in the CTG
A
variability
7
Q
what is normal variability?
A
between 5 and 25 bpm
8
Q
what’s more ominous, shallow decelerations or sharp deep decelerations?
A
shallow
- takes long time to recover
- variability is probably reduced
