Complicated pregnancy Flashcards
VTE in pregnancy risk factors
Smoking
Parity > 3
Age > 35 years
BMI > 30
Reduced mobility, multiple pregnancy
Pre-eclampsia
Gross varicose veins
FHx of VTE, thrombophilia, IVF pregnancy
VTE in pregnancy prophylaxis
Start from:
- 28 weeks if 3 risk factors
- first trimester if there are four or more of these risk factors
All pregnant women should have a risk assessment for their risk of VTE at booking; performed again at birth
LMWH unless contraindicated, continued throughout the antenatal period & for six weeks postnatally (temporarily stopped if woman goes into labour)
Mechanical prophylaxis → intermittent pneumatic compression, anti-embolic compression stockings
VTE in pregnancy diagnosis
Doppler USS - repeat if negative on days 3 & 7 in patients with a high index of suspicion of DVT
Suspected PE - CXR, ECG
CTPA/VQ scan
VTE in pregnancy mx
LMWH - enoxaparin, dalteparin & tinzaparin
- should be started immediately before confirming the diagnosis in patients with DVT/PE
- continued for remainder of pregnancy & six weeks postnatally/three months in total
Maternal sepsis aetiology
Chorioamnionitis
Urinary tract infections
Chorioamnionitis
Infection of the chorioamniotic membranes & amniotic fluid
Usually occurs in later pregnancy & during labour
Can be caused by a large variety of bacteria → gram-positive bacteria, gram-negative bacteria & anaerobes
Chorioamnionitis clinical features
Abdominal pain
Uterine tenderness
Vaginal discharge
Maternal sepsis presentation
MEOWS - monitors physical observations to identify signs of sepsis
Non-specific signs - fever, tachycardia, raised RR, reduced oxygen sats, low BP, altered consciousness, reduced urine output, raised white cells on FBC, fetal compromise on CTG
Maternal sepsis ix
FBC, U&Es, LFTs, CRP, clotting, blood cultures, blood gas
Additional ix for suspected source → urine dipstick & culture, high vaginal swab, throat swab, sputum culture, wound swab after procedures, LP
Maternal sepsis mx
Senior obstetricians and midwives should be involved early in the care of the women with suspected chorioamnionitis/sepsis
Sepsis 6
Continuous maternal & fetal monitoring is required
Abx from local guidelines
- tazocin + gentamicin
- amoxicillin + clindamycin + gentamicin
Placental abruption
A part/all of the placenta separates from the wall of the uterus prematurely
Placental abruption pathophysiology
Thought to occur following a rupture of maternal vessels within the basal layer of the endometrium
Blood accumulates & splits the placental attachment from the basal layer
Detached portion of the placenta is unable to function → rapid fetal compromise
Two types:
- revealed - bleeding tracks down from the site of placental separation and drains through the cervix, results in vaginal bleeding
- concealed - bleeding remains within the uterus & typically forms a clot retroplacentally; bleeding is not visible but can be severe enough to cause systemic shock
Placental abruption risk factors
Placental abruption in previous pregnancy
Pre-eclampsia & other HTN disorders
Abnormal lie of the baby
Polyhydramnios
Abdominal trauma
Smoking/drug use
Bleeding in first trimester
Underlying thrombophilias
Multiple pregnancies
Placental abruption clinical features
Painful vaginal bleeding
O/E - woody uterus (tense all of the time) & painful on palpation
Placental abruption ix
Bloods - FBC, clotting profile, Kleihauer, group and save, cross-match, U&Es, LFTs
CTG if > 26 weeks
Transvaginal scan
Placental abruption mx
ABCDE
Emergency delivery - maternal +/- fetal compromise
Induction of delivery - haemorrhage at term without maternal or fetal compromise
Conservative mx - for partial/marginal abruptions not associated with maternal or fetal compromise
Give anti-D within 72 hours of the onset of bleeding if the woman is Rh D-
Placenta praevia
Placenta is fully or partially attached to the lower uterine segment
Important cause of antepartum haemorrhage - vaginal bleeding from week 24 of gestation until delivery
Placenta praevia pathophysiology
Minor placenta praevia - placenta is low but does not cover the internal cervical os
Major placenta praevia - placenta lies over the internal cervical os
Low-lying placenta is more susceptible to haemorrhage
- can be spontaneous or provoked by mild trauma (vaginal examination)
Placenta praevia risk factors
Previous CS - main
High parity
Maternal age > 40 years
Multiple pregnancy
Previous placenta praevia
History of uterine infection
Curettage to the endometrium after miscarriage/termination
Placenta praevia clinical features
Painless vaginal bleeding
Can be pain if woman is in labour
O/E - CS scar, multiple pregnancy, uterus is not tender on palpation
Placenta praevia ix
Bloods - FBC, clotting profile, Kleihauer test (if woman if Rh-, determine amount of haemorrhage & dose of anti-D), group and save, cross-match, U&Es, LFTs
Woman > 26 weeks, CTG performed
Digital vaginal examination should not be performed → may provoke severe haemorrhage
Transvaginal USS
Placenta praevia mx
ABCDE
May be identified in an asymptomatic patient at their 20 weeks USS:
- placenta praevia minor → repeat scan at 36 weeks
- placenta praevia major → repeat scan at 32 weeks
CS safest mode of delivery (elective at 38 weeks)
All cases of antepartum haemorrhage → give anti-D within 72 hours of the onset of bleeding if woman if Rh D-
Vasa praevia
Condition where the fetal vessels are within the fetal membranes & travel across the internal cervical os
The vessels are placed over internal cervical os, before the fetus
Vasa praevia pathophysiology
Fetal vessels are exposed, outside the protection of the umbilical cord/placenta
Travel through the chorioamniotic membranes & pass across the internal cervical os
Exposed vessels are prone to bleeding, particularly when the membranes are ruptured during labour & at birth
Vasa praevia types
Type I - fetal vessels are exposed as a velamentous umbilical cord
Type II - fetal vessels are exposed as they travel to an accessory placental lobe
Vasa praevia risk factors
Low lying placenta
IVF pregnancy
Multiple pregnancy
Vasa praevia clinical features
Triad - painless vaginal bleeding, rupture of membranes & fetal bradycardia
May be diagnosed by ultrasound during pregnancy → planned CS
APH, with bleeding during the second/third trimester of pregnancy
May be detected during labour → when fetal distress & dark red bleeding occur following rupture of the membranes
O/E - pulsating fetal vessels seen in membranes through the dilated cervix
Vasa praevia mx
Asymptomatic women with vasa praevia:
- corticosteroids from 32 weeks
- elective CS planned for 34-36 weeks
Emergency CS for APH
Uterine sources of APH
Circumvallate placenta
Placental sinuses
Lower genital tract sources of APH
Cervical polyps
Cervical erosions & carcinoma
Cervicitis
Vaginitis
Vulval varicosities
Primary post-partum haemorrhage
Loss of >500 ml of blood PV within 24 hours of delivery
Minor - 500-1000ml of blood loss
Major - > 1000ml of blood loss
Primary post-partum haemorrhage aetiology & risk factors
Tone - uterus fails to contract adequately following delivery, due to a lack of tone in the uterine muscle
- maternal profile: age > 40, BMI > 35, Asian ethnicity
- uterine over-distension: multiple pregnancy, polyhydramnios, fetal macrosomia
- labour - induction, prolonged
- placental problems - praevia, abruption, previous PPH
Tissue - retention of placenta tissue
Trauma - refers to damage sustained to the reproductive tract during delivery
- instrumental vaginal deliveries
- episiotomy
- CS
Thrombin - coagulopathies and vascular abnormalities which increase of primary PPH:
- vascular - placental abruption, HTN, pre-eclampsia
- coagulopathies - VWD, haemophilia A/B, ITP or acquired eg. DIC, HELLP
Primary post-partum haemorrhage clinical features
PV bleeding
Dizziness, palpitations, SoB
O/E - haemodynamic instability, signs of uterine rupture, reveal sites of local trauma, examination of placenta
Primary post-partum haemorrhage ix
Bloods - FBC, cross match 4-6 units of blood, coagulation profile, U&Es, LFTs
Primary post-partum haemorrhage definitive mx
Uterine atony - bimanual compression to stimulate uterine contraction, pharmacological measures, surgical measures (intrauterine balloon tamponade)
Trauma - primary repair of laceration if uterine rupture
Tissue - IV oxytocin, manual removal of placenta & prophylactic abx in theatres
Thrombin - correct any coagulation abnormalities with blood products under the advice of the haematology team
Syntocinon
Synthetic oxytocin, act on oxytocin receptors in the myometrium
SEs: N&V, headache
Contraindications: hypertonic uterus, severe CVS disease
Ergometrine
Multiple receptor sites action
SEs: HTN, nausea, bradycardia
Contraindications: HTN, eclampsia, vascular disease
Carboprost
Prostaglandin analogue
SEs: bronchospasm, pulmonary oedema, HTN, CVS collapse
Contraindications: cardiac disease, pulmonary disease, untreated PID
Misoprostol
Prostaglandin analogue
SEs: diarrhoea
Primary post-partum haemorrhage prevention
Active management of the 3rd stage of labour routinely reduces PPH risk by 60%:
- women delivering vaginally should be administered 5-10 units of IM oxytocin prophylactically
- women delivery via SC should be administered of IV oxytocin