difficulty in delivering the fetal shoulders after delivery of the head
requiring additional manoeuvres
what is the incidence of shoulder dystocia?
what is a major risk from the treatment of shoulder dystocia? and why?
Erb's palsy (waiter's tip)
due to excessive traction on the neck which damages the brachial plexus
permanent in 50%
what actually happens in shoulder dystocia?
anterior shoulder abuts the pubic symphysis, stays behind there and fails to rotate
what are the risk factors for SD?
high maternal BMI
what is the pneumonic for treatment of SD?
H: call for HELP - obs, midwife, pads as pH drops by 0.01/min so easily hypoxic
E: evaluate for EPISIOTOMY
L: LEGS are hyperflexed = Mc Roberts position, this flattens the sacral promontory and thereby increases the AP diameter of pelvic inlet and allows shoulders to come down
P: PRESSURE - suprapubic sustained pressure (Rubin's manoeuvre) towards the face for 30s, if doesn't work do rocking pressure, should dislodge shoulder (someone puts pressure while obs gets baby out)
E: ENTER - wood's screw manoeuvre: 2 fingers in vagina from below and try to push anterior shoulder down to rotate it to the widest diameter, if this doesn't work then b) other hand put fingers on posterior shoulder and push it the other way. still doesn't work then c) fully rotate baby backwards = reverse wood's screw and delivery the baby the other way
R: REMOVAL of posterior arm: sweep up past its face and the anterior goes down
R: ROLL on all 4's: can easily see posterior arm
what are the 2 main last resorts for SD Rx?
symphiosotomy: after lateral replacement of urethra with a metal catheter
zavanelli manoeuvre: replace head back into pelvis and do C-section - but fetal damage very high risk and irreversible
what is a major problem to the mum after SD? and why?
due to episiotomy and uterine atony
what are the complications to the fetes after SD?
neurological damage, death
brachial plexus injury: Erbs palsy, T1, C8 injury
what happens in uterine rupture - 4 things:
1. rupture - so fetes is extruded
2. uterus contracts down and bleeds from rupture site
3. causing fetal hypoxia
4. massive internal maternal bleed so shock
what type of rupture is less serious and why?
rupture from LSCS scar
as lower segment is less vascular so less bleeding
extrusion of fetes is less likely
what is neonatal mortality from uterine rupture of LSCS scar rupture?
how would you suspect diagnosis of uterine rupture? ie what are signs and symptoms?
fettle extrusion = feel fettle parts easily on abdo palpation
uterine contractions stopped
maternal collapse as massive internal bleeding
what are main complications of uterine rupture?
fetal morbidity, mortality
maternal collapse as massive bleed
what are 3 main risk factors for uterine rupture?
1. labours with scarred uterus - previous uterine classical CS, deep myomectomy
2. obstructed labour (more in west)
3. congenital uterine abnormalities - may get rupture before labour
how can uterine rupture be prevented?
careful augmentation using oxytocin in VBAC
what is Rx of uterine rupture?
help - call senior obs, midwife in charge, haematologist, scribe, paeds, porter, lab to cross match blood
ABC - maternal resuscitation
2 large bore cannulae into antecubital fossa
iv fluids and blood into one
blood tests from other: FBC (check Hb), U&E, cross match
urgent laparotomy - delivery fetes and repair or remove uterus to stop maternal bleeding
what is prognosis of uterine rupture for future?
high recurrence rate
next pregnancy needs EARLY CS
what is uterine inversion?
when fundus inverts into uterine cavity
when does uterine inversion usually happen?
after traction on the placenta (3rd stage labour)
what are 3 signs of uterine inversion?
what is Rx of uterine inversion?
1st brief attempt to immediately push fundus up via vagina
if impossible - then GA given and replace with hydrostatic pressure of several litres of WARM SALINE - run past a clenched fist at the introits into the vagina
what is cord prolapse?
cord descends below the presenting part
what happens if cord prolapse is untreated?
cord will be compressed or go into spasm
baby becomes HYPOXIC
what is prevalence of cord prolapse?
1 in 500
what are 5 risk factors for cord prolapse?
breech presentation esp FOOTLING
abnormal lie - tranverse
maternal causes: pelvic mass eg fibroid, contracted pelvis
what may cause cord prolapse?
when is diagnosis of cord prolapse made?
cord palpated vaginally or appears at introits
what has reduced incidence of cord prolapse?
widespread practice of delivering breech by CS
why do you get asphyxia in cord prolapse? 2 reasons
compression of cord between presenting part and bony pelvis
spasm of cord vessels when exposed to cold/manipulations
what is management of cord prolapse?
HELP - emergency buzzer, obs spr, SHO, paeds, anaesthetist
check if fetes is viable - scan to confirm fettle heart present
DO NOT FEEL CORD FOR PULSATIONS
then do VE to see if fully dilated
if fully and head is low - then consider ventouse delivery
if not fully then push up presenting part to prevent compression
if fettle bradycardia = tocolysis 2 puffs salbutamol
transfer to theatre ASAP - monitor FHR all times and prior to CS
if FH stable and bladder filled, can have spinal anaesthetic
release bladder clamp at skin incision
what to do after Rx for cord prolapse?
what is amniotic fluid embolism?
when liquor enters the maternal circulation
what are symptoms of AF embolism?
cardiac arrest - acute heart failure
what % die in AF embolism?
what are complications of AF embolism?
DIC - consumptive coagulopathy so can bleed
when does AF embolism occur?
what are risk factors for amniotic fluid embolism?