antenatal testing Flashcards
goal of antenatal testing
prevent fetal death
what is a good indicator of normal fetal autonomic function?
fetal heart reactivity
if decr umbilical artery doppler, then suspect?
IUGR
why do intrapartum fetal monitoring?
evaluate fetal oxygenation
if membranes are ruptured, what type of monitoring to use?
internal monitoring
what can you use to p/u uterine contractions?
tocodynamometer
what to use to monitor fetal heart after membranes have ruptured
fetal scalp electrode
what can be used to monitor uterine contractions after membranes have ruptured
intrauterine pressure catheter
> 5 ctx in 10 min averaged over 30 minutes?
tachysystole
normal # uterine contractions is ____ or less in ___min avg over ____min
5 contractions or less in 10 min averaged over 30 minutes
normal term baseline fetal HR?
110-160 bpm
to establish baseline fetal HR, look at HR occuring____
between contractions
fetal tachycardia is defined as?
10 min of longer of HR >160
how is baseline variability measured?
amplitude of peak to trough in bpm
what is one of the best indicators of intact integration b/w CNS & heart of fetus
normal FHR variability
compression of what 3 things can result in decr in fetal HR
- fetal head
- umbilical cord
- uterine myometrial vessels
mirror image of contraction
early deceleration
transitory decr in HR caused by uteroplacental insufficiency
late deceleration
decr in FHR >15 bpm for >15sec, less than 2 min in duration
variable deceleration
Reflex change mediated by vagus nerve; generally caused by umbilical cord compression
variable deceleration
what is the most common deceleration noted during labor?
variable deceleration
which category indicates abnormal acid-base balance
class 3
which category indicates normal acid-base balance
class 1
what reliably predicts absence of metabolic acidemia at the time of observation
moderate FHR variability
