Obstetrics and Gynaecology Flashcards
Define antepartum haemorrhage
Bleeding from or in to the genital tract from 24+0 weeks of pregnancy and prior to the birth of the baby.
What are causes of antepartum haemorrhage?
- Placenta praevia/LLP.
- Vasa praevia.
- Placental abruption.
Serious with high morbidity and mortality
Define postpartum haemorrhage (PPH)
Bleeding after vaginal birth >500ml or caesarean > 1000ml
Minor PPH <1000ml
Major PPH > 1000ml:
- Moderate = 1000 to 2000ml
- Severe = > 2000ml
Define primary PPH
PPH within 24 hours of delivery.
Define secondary PPH
PPH from 24 hours to 12 weeks after delivery
What are the 4 causes of primary PPH?
4Ts
- Tone: uterine atony (most common)
- Trauma: genital tract injury (e.g. perineal tear)
- Tissue: retained placenta
- Thrombin: underlying clotting disorder
What are risk factors of primary PPH?
- Previous PPH
- Overdistension of uterus (e.g. macrosomia)
- Multiple pregnancy (e.g. twins)
- Failure to progress in second stage
- Prolonged third stage
What are the clinical features (symptoms & signs) of primary PPH?
Symptom: heavy vaginal bleeding
Signs: shock e.g. tachycardia, hypotension, reduced GCS
If PPH was due to atony, what would you see/feel on examination?
Enlarged, soft, or boggy uterus.
What investigations are done for PPH?
- Vital signs
- Bloods - FBC, clotting, group & save/crossmatch, U+Es
What can minimise risk of PPH?
- Treat antenatal anaemia
- Active management of third stage of labour - uterotonic drugs (e.g. intramuscular oxytocin (10IU)), deferred cord clamping, controlled traction to deliver placenta.
- IV tranexamic acid during 3rd stage in C-section if high risk
What is the general management of PPH?
- ABCDE
- IV access (two large bore cannulas)
- Bloods for FBC, U+E and clotting screen
- Group + cross match 4 units
Warmed IV fluids + blood - O2 (regardless of sats)
Severe = major haemorrhage protocol
What is the management of PPH due to atony
Tx to stop bleeding:
- Rubbing uterus through abdo (“rubbing up the fundus)
- Catheterisation - bladder distention prevents uterine contractions
- Uterotonic drugs (e.g. oxytocin+, carboprost, ergometrine)
- Tranexamic acid
- Surgical - intra-uterine balloon tamponade, haemostatic sutures
- Hysterectomy
+IV oxytocin infusion given as 40 units in 500ml, “40 units” means this
What is the management of PPH due to trauma?
Surgical repair of tears
What is the management of PPH due to thrombin?
Tranexamic acid, discuss blood products with haematology
What is the management of PPH due to tissue?
Manual removal of retained product of conception (e.g. retained placenta) in theatre
Give some complications of primary PPH
Shock, DIC, Sheehan’s syndrome (pituitary gland necrosis),PTSD, death.
What are some causes of secondary PPH?
- Infection - endometritis
- Retained products of conception.
What are the clinical features of secondary PPH?
- Tender or bulky uterus
- Open cervical os with foul-smelling discharge
What are the investigations for secondary PPH?
- Sepsis - FBC, U&Es, CRP, lactate, blood cultures.
- HVS (high vaginal swab) and endocervical for infection
- Pelvic ultrasound scan to look for retained products.
More info on swabs: https://geekymedics.com/vaginal-swabs-osce-guide/
What is the management for secondary PPH?
Infection = Abx
Retained products = surgical evacuation
What is placental abruption?
The complete (7%) or partial detachment (93%) of the placenta from the decidua basalis before delivery
What are the risk factors for placental abruption?
- Previous abruption
- Maternal age > 35
- Multiparity
- Smoking
- Cocaine
What is a revealed placental abruption?
It is when blood is seen leaking from the vagina in placental abruption