Mechanisms of labour Flashcards
Two parts to stage one of labour
latent
active
cervical dilation in
- latent stage of 1
- active stage of 1
0-3cm
3-10cm (fully dilated)
expected rate of cervical dilation in a primip?
1cm per 2hr
expected rate of cervical dilation in a multip?
1cm per hr
what clinical signs in the first stage of labour?
regular painful contractions
progressive cervical dilation
“show”
ROM
What happens to the feotus during stage 1
head descends into the plevis
3 Ps
Passenger
Passage
Power
Complications of stage one
a) Passenger
b) Passage
c) Power
a) Fetal malpresentation
b) fibroids / cervical stenosis
c) Uterine interia
Potential interventions to improve the progression in stage one (3)
prostaglandin gel
AROM
Oxytosin - help contractions
What happens in stage 2 of labour (briefly)
expulsion of the foetus
first movement the foetus makes in stage two
flexion of the head as it descends and engages
body and head in OT position
after flexion of the foetus what happens?
the head internally rotates to lie in the OA position
what happens after internal rotation?
the foetal head extends as it is delivered
what happens after the head extends?
the foetal head restitutes and returns to the OT position
what happens after restitution?
the anterior shoulder is delivered by posterior flexion of the body
