Labour and puerperium Flashcards
(121 cards)
What is induction of labour
Start labour artificially
Needed in 20% of pregnancies
When safer to deliver baby than keep in utero
Can be to optimise maternal health
What are the indications for induction of labour
Prolonged gestation
Premature rupture of membranes
Maternal health problems
Fetal growth restriction
Intrauterine fetal death
When should induction of labour be used in prolonged gestation
Uncomplicated pregnancies, offer between 40+0 and 40+14
Prolonged gestation associated with fetal compromise and stillbirth
If mother declines induction, increased monitoring after 42 weeks
When should induction of labout be used in premature rupture of membranes
If >37 weeks
- Offer induction of labour or expectant management for 24 hours
If 34-37 weeks
- Time induction based on risk vs benefit
If < 34 weeks
- Delay induction (unless have fetal compromise)
What maternal health problems should lead to consideration for induction of labour
Hypertension
Pre-eclampsia
Diabetes
Obstetric cholestasis
What are the absolute contraindications for induction of labour
Cephalopelvic disproportion
Major placenta praevia
Vasa praevia
Cord prolapse
Transverse lie
Active primary genital herpes
Previous classical C-section
What are the relative contraindications for induction of labour
Breech presentation
Triplet(+) pregnancy
2+ previous low transverse C-sections
What are the methods of induction of labour
Vaginal prostaglandins
Amniotomy
Membrane sweep
How are vaginal prostaglandins used in the induction of labour
Primary method
Ripen cervix
Help with uterine contractions
Maximum 1 cycle per day (1 pessary, or 1 tablet/gel repeated after 6 hours)
What is amniotomy
Artificially rupture membranes using amnihook
Get release of prostaglandins, hope to start labour
Only when cervix is ripe
Can be given alongside syntocinon
Not first line (unless prostaglandins contraindicated) - risk of uterine hyperstimulation
What is a membrane sweep
Not a formal method of induction
Gloved finger through cervix, aim to separate membrane and release prostaglandins
Increases chances of spontaneous labour
Nulliparous: offer at 40 and 41 weeks
Multiparous: offer at 41 weeks
What methods of monitoring are used during induction of labour
Bishop score
CTG (if using oxytocin, use CTG throughout)
What is a Bishop score
Assessment of cervical ripening based on vaginal examination
Used before and during induction
> 7 = cervix favourable (high chance of response)
<4 = unlikely to progress naturally, will need prostaglandin induction
What are the complications of induction of labour
Failure of induction (offer more prostaglandins or C-section)
Uterine hyperstimulation (manage with tocolytic (anti-contraction) agents)
Cord prolapse
Infection
Pain (more severe than with natural labour)
Increased need for further intervention
Uterine rupture
What is operative vaginal delivery and what are the methods used
Use of instruments to aid delivery
Up to 3 pulls with one instrument, then switch to a different one
Ventouse
Forceps
How is ventouse used in operative vaginal delivery
Low risk of maternal complications
Attach cup to fetal head using vacuum, apply traction with each contraction
Electrical pump, or kiwi (used to rotate fetus)
Lower success rate, less maternal perineal injury, less pain, more cephalhematoma, more subgaleal haematoma, more fetal retinal haemorrhage
How are forceps used in operative vaginal delivery
Lower risk of fetal complications
2 blades, go around fetal had, apply traction with contractions
Higher rates of 3rd/4th degree tears, not ideal for rotation, no need for maternal effort
What are the maternal indications for operative vaginal delivery
Inadequate progress
- 2 hours of pushing in nulliparous
- 1 hour of pushing in multiparous
Exhaustion
Medical conditions where active pushing should be limited (intracranial pathology, congenital heart defects, severe hypertension)
What are the fetal indications for operative vaginal delivery
Suspected fetal compromise in 2nd stage of labour (abnormal CTG/bloods)
Clinical concern (significant antepartum haemorrhage…)
What are the absolute contraindications for operative vaginal delivery
Unengaged fetal head (singleton)
Incompletely dilated cervix (singleton)
True cephalo-pelvic disproportion
Breech and face presentation
Preterm (<34 weeks) - for ventouse
Fetus high risk of coagulation disorders - for ventouse
What are the relative contraindications for operative vaginal delivery
Non-reassuring fetal status with head above pelvic floor
Delivery of twin 2, where head has not engaged or cervix has re-formed
Prolapse of umbilical cord when cervix is fully dilated
What are the pre-requisites for instrumental delivery
Fully dilated
Ruptured membranes
Cephalic presentation
Defined fetal position
Fetal head at least at ischial spine
Empty bladder
Adequate pain relief
Adequate maternal pelvis
What are the fetal complications of operative vaginal delivery
Neonatal jaundice
Scalp lacerations
Cephalhaematoma
Subgaleal haematoma
Facial bruising
Facial nerve damage
Skull fractures
Retinal haemorrhage
What are the maternal complications of operative vaginal delivery
3rd/4th degree vaginal tears
VTE
Incontinence
PPH
Shoulder dystocia
Infection