Intrapartum Care: Umbilical Cord Prolapse, Shoulder Dystocia & Instrumental Delivery Flashcards
What is cord prolapse?
When the umbilical cord descends below the presenting part of the fetus and through the cervix into the vagina, after rupture of the fetal membranes.
If left untreated, what can umbilical prolapse lead to?
Compression of the cord or cord spasm –> fetal hypoxia.
What is the most significant risk factor for cord prolapse?
When the fetus is in an abnormal lie after 37 weeks gestation (i.e. unstable, transverse or oblique).
How does the fetus being in an abnormal lie increase the risk of cord prolapse?
Being in an abnormal lie provides space for the cord to prolapse below the presenting part.
In a cephalic lie (normal), the head typically descends into the pelvis, without room for the cord to descend.
Risk factors for cord prolapse?
- abnormal presentations e.g. Breech, transverse lie
- prematurity
- multiparity
- polyhydramnios
- twin pregnancy
- cephalopelvic disproportion
When do approx 50% of cord prolapses occur?
At artificial rupture of the membranes.
When should cord prolapse be suspected?
Where there are signs of fetal distress on the CTG.
How is a diagnosis of cord prolapse made?
Signs of fetal distress on the CTG + cord palpable on vaginal exam.
Management of cord prolapse?
Obstetric emergency!
1) The presenting part of the fetus may be pushed back into the uterus to avoid compression
2) If the cord is past the level of the introitus, there should be minimal handling and it should be kept warm and moist to avoid vasospasm
3) C section usually indicated
In cord prolapse, if the cord is past the level of the introitus, how can vasopasm be avoided?
1) minimal handling of cord
2) keep cord warm and moist
In cord prolapse, what position should the woman be in until preparations for an immediate caesarian section have been carried out?
Patient is asked to go on ‘all fours’.
The left left lateral position (with a pillow under the hip) is an alternative.
What drug can be used in cord prolapse to reduce uterine contractions whilst waiting for delivery by caesarean section?
Tocolytics e.g. nifedipine, terbutaline
Why can retrofilling the bladder with 500-700ml of saline be helpful in cord prolapse?
As it gently elevates the presenting part.
1st line of delivery in cord prolapse?
Caesarian section
Why is patient asked to go on all fours in cord prolapse?
This position uses gravity to draw the fetus away from the pelvis and reduce compression on the cord.
What is shoulder dystocia?
A complication of vaginal cephalic delivery when the anterior fetal shoulder becomes stuck on the maternal pubic symphysis, resulting in delayed birth of the baby’s body.
Obstetric emergency!
What is the major complications of shoulder dystocia?
1) Shoulder compression may cause the umbilical cord to become compressed between the baby’s body and the mother’s pelvis.
2) The baby’s neck may be compressed at an angle that limits blood flow.
3) Hypoxia brain injury due to interruption of the oxygen supply.
Cause of shoulder dystocia?
Shoulder dystocia usually occurs unexpectedly during childbirth and is not predictable.
What are some pre-labour risk factors for shoulder dystocia?
1) previous shoulder dystocia
2) macrosomia >4.5kg
3) diabetes mellitus
4) maternal BMI >30
5) induction of labour
What are some intrapartum risk factors for shoulder dystocia?
1) prolonged 1st stage of labour
2) 2ary arrest: no change in cervical dilation over time.
3) prolonged 2nd stage of labour
4) oxytocin augmentation
5) assisted vaginal delivery
How does a baby’s birth weight affect risk of shoulder dystocia?
Shoulder dystocia is more likely in babies with higher birth weights, but it should be noted that there is no difficulty delivering the shoulders in most babies over 4.5kg.
What is the biggest maternal risk factor for shoulder dystocia?
Diabetes: the risk is significantly higher, even with a similar-sized baby.
If a woman has pre-existing diabetes or develops diabetes in pregnancy, what will they be offered to reduce/eliminate risk of shoulder dystocia?
Early labour induction or planned caesarean.
How does shoulder dystocia present?
1) Difficulty delivering the face and head.
2) Unable to deliver the anterior shoulder after the delivery of the head with the next contraction
3) May be failure of restitution: where the head remains face downwards (occipito-anterior) and does not turn sideways as expected after delivery of the head.
4) The turtle-neck sign: where the head is delivered but then retracts back into the vagina.