Obstetrics & Gynaecology Flashcards
Reason for folic acid supplementation in pregnancy
↓ risk of neural tube defects
Standard folic acid supplementation in pregnancy
400 micrograms/day for ~3 months before conception until 12th week of pregnancy
take 5mg/day if high risk group
Groups requiring 5mg folic acid supplementation
previous neural tube defects family history of NTDs Diabetes Coeliacs Thalassaemia Anti-epileptic medication obese women (>30kg/m^2)
recommendation for alcohol intake in pregnancy
recommended to not consume any alcohol
but if women choses to drink ≤1-2 units/week
Complications of smoking in pregnancy
IUGR low birth weight miscarriage still birth premature delivery placental issues
foods to avoid in pregnancy
uncooked meat/fish, raw egg, unpasteurised milk, soft cheese, raw shellfish
epilepsy medication considered safe in pregnancy
lamotrigine
dangerous anti epileptics in pregnancy
sodium valproate
phenytoin
Antidepressants safe in pregnancy
Fluoxetine
amitriptyline
Mood stabiliser to avoid in pregnancy
lithium
Diabetes drugs and pregnancy
discontinue all hypoglycaemic agents except metformin
supplement metformin with insulin if needed
anithypertenisve medication in pregnancy
Stop ACE-Is & ARBs
Stop Statins
Timing of booking appointment
8-12 weeks
ideally at <10weeks
Purpose of booking visit (8-12 weeks)
General info e.g. diet/folic acid/Vit D/alcohol/smoking
BP
Urine dipstick
BMI check
Booking bloods (FBC,HIV, Hep B, Syphilis, Rhesus status, red cell allo antibodies, haemoglobinopathies)
Urine culture (for asymptomatic bacteriuria)
GDM screen if risk factors
10-13+6 weeks check
early scan to confirm dates & exclude multiple pregnancy
11-13+6 weeks check
Down syndrome screening (nuchal translucency, beta-hCG, PAPPA)
18 - 20+6 week check
anomaly scan (USS)
Extra antenatal care dates for primips
25 weeks
31 weeks
40 weeks
all routine care (BP, urine dip, SFH)
28 week check
routine care (BP, urine dip, SFH) second anaemia screening Give first dose of anti-D prophylaxis if Rh -ve
34 week check
routine care (BP, urine dip, SFH) Birth planning/labour info Give second dose of anti-D prophylaxis if Rh -ve
36 week check
check presentation & offer external cephalic version if indicated routine care (BP, urine dip, SFH)
Conditions screened for in all pregnant women
anaemia bacteriuria blood group Rh status anti-red cell antibodies Down's syndrome fetal anomalies Hep B HIV NTDs syphilis
Down syndrome screening
11-13+6 weeks gestation
consisting of nuchal translucency, beta-hCG, PAPP-A)
Results suggesting Trisomy 21
↑nuchal translucency
↑beta-hCG
↓PAPP-A
NB trisomy 13/18 give similar results but lower PAPP-A values
Triple/Quadruple test for Down syndrome screening
used if booked late, so offered at 15-20 weeks
Triple test = AFP, uncojugated oeastriol (uE3), beta-hCG, Quadruple test =AFP, uncojugated oeastriol (uE3), beta-hCG, inhibit-A
results suggestive of Downs:
AFP ↓, uncojugated oeastriol (uE3) ↓, beta-hCG ↑, inhibit-A ↑
Positive Down syndrome prenatal diagnosis
offer diagnostic testing with chronic villous sampling (<13 weeks) or amniocentesis (<15 weeks)
if diagnosed offer TOP or continue pregnancy with appropriate support
chronic villous sampling (<13 weeks) or amniocentesis (<15 weeks) risk of miscarriage
~1% (1/100)
Antenatal rubella infection
suspected Rubella infection in pregnancy should be discussed with health protection unit
offer MMR vaccination in postnatal period
Antenatal Varicella Zoster infection
Risk of fatal varicella syndrome
Management:
check maternal blood for varicella immunity
if not immune:
<20 weeks: give varicella-zoster immunoglobulin (VZIG)
>20 weeks: give VZIG or aciclovir days 7-14 post exposure
antenatal CMV infection
no effective treatment
ensure good personal hygiene and avoid infected individuals
HIV infection in pregnancy
screened for in all pregnant women
- Maternal antiretroviral therapy (Zidovudine + 2 other antiretrovirals)
- Elective C-section at 38-39 weeks (consider delaying to >39 weeks if viral load >50copies/ml)
- neonatal antiretorviral therapy (Zidovudine)
- avoid breastfeeding (bottle feeing only)
if all prophylactic steps taken then mother to child transmission <1%
Hep B in pregnancy
screened for in all pregnant women
give full immunisation + Hep B immunoglobulin to baby of Hep B infected mother
define theses alloimmunisation
Rh -ve mothers may develop anti-D IgG antibodies if sensitised e.g. previous Rh +ve pregnancy, delivery, miscarriage, TOP, ectopic pregnancy, antepartum haemorrhage
preventing Rh alloimmunisation
test for anti-D antibodies for all Rh -ve mothers at booking
routine anti-D prophylaxis at 28&34 weeks if not sensitised
if sensitising event in 2nd/3rd trimester = large dose of anti-D & perform Keinhauer test
When to give anti-D immunoglobulin
Give within 72h of event
delivery of Rh +ve infant (stillbirth/live) TOP Miscarriage at >12 weeks gestation ectopic pregnancy ECV antepartum haemorrhage amniocentesis chorionic villous sampling fatal blood sampling abdominal trauma
Nausea & vomiting in pregnancy
affects ~75% of pregnancies
usually resolves by 16 weeks of gestation
symptoms beginning at >12 weeks usually have other causes
hyperemesis gravidarum
severe protracted nausea & vomiting associated with weight loss >5% of pre-pregnancy weight, fluid loss, dehydration, electrolyte imbalance
usually occurs between 8-12 weeks
Admission criteria for hyperemesis gravidarum
continued N&V + unable to keep down liquids/oral antiemetics
continued N&V + ketonuria and/or weight loss >5%
Obstetric cholestasis/intrahepatic cholestasis of pregnancy
pruritic condition of pregnancy due to impaired bile flow allowing bile salts to be deposited into the skin & placeenta
risk of recurrence of ectopic pregnancy
10-20%
Conditions associated with obstetric cholestasis/intrahepatic cholestasis of pregnancy
↑ risk of foetal distress
↑ risk of intrauterine death
↑ risk of premature birth
↑ maternal morbidity
Investigating obstetric cholestasis/intrahepatic cholestasis of pregnancy
Bile acid ↑
LFTs (AST ↑, ALT ↑, Gamma-GT ↑, ALP ↑)
Bilirubin↑
Management of obstetric cholestasis/intrahepatic cholestasis of pregnancy
weekly LFTs
Ursodeoxycholic acid
Vit K supplement
induction of labour at 37-38 weeks
Gestational diabetes mellitus (GDM)
a degree of glucose intolerance with its first onset during pregnancy & usually resolving shortly after delivery
Diagnostic criteria for gestational diabetes mellitus (GDM)
Fasting glucose ≥ 5.6mmol/L
2h postprandial glucose ≥7.8mmol/L
NB: the rule is 5678
Screening for gestational diabetes mellitus (GDM)
oral glucose tolerance test at booking & 24-28 weeks
Managing gestational diabetes mellitus (GDM)
1st line: blood glucose monitoring, diet & exercise, weight loss
2nd line: add metformin if not controlled by diet after 1-2 weeks
3rd line: insulin
NB if fasting glucose ≥7mmol/L start insulin
Complications of gestational diabetes mellitus (GDM)
macrosomia large for gestational age pre-eclampsia ↑ risk of shoulder dystocia ↑ risk of neonatal hypoglycaemia
Managing pre-existing diabetes in pregnancy
aim for BMI<27
stop all oral hypoglycaemics except metformin & commence insulin
folic acid 5mg pre-conception till 12 weeks gestation
Pre-existing hypertension in pregnancy
BP >140/90 either at booking or prior to 20 weeks gestation, no protein uria/oedema
Stop ACE-Is & ARBs and switch medication
aim for BP <150/100
Gestational hypertension
BP >140/90 after 20 weeks gestation without proteinuria / oedema
usually resolves spontaneously after birth
Termination of pregnancy (TOP)
also referred to as termination or abortion
medically directed miscarriage prior to independent viability using surgical/pharmacological means
complications of gestational hypertension & pre-existing hypertension in pregnancy
↑ risk of placental abruption ↑ risk of cerebrovascular event ↑ risk of DIC ↑ risk IUGR ↑ risk of prematurity ↑ risk of intrauterine death
Pre-eclampsia
condition seen at >20 weeks gestation characterised by new onset hypertension >140/90 associated with proteinuria & oedema
Eclampsia
pre-eclampsia with the development of seizures/convulsions
Risk factors for pre-eclampsia/eclampsia
Primiparity BMI >30 ↑ maternal age (>40 yrs) multiple pregnancy FHx of pre-eclampsia/eclampsia pre-existing diabetes/HTN/CKD/SLE/antiphospholipid syndrome
Preventing pre-eclampsia/eclampsia
75mg - 150mg of aspirin from week 12 till delivery
Presentation of pre-eclampsia/eclampsia
BP >140/90 + ≥1+ protein on urine dipstick headaches upper abdo pain oedema visual disturbances/blurry vision papilloedema
Seizures if eclampsia
Investigating pre-eclampsia/eclampsia
Urinalysis
FBC/LFTs/U&Es/renal function
USS to assess foetal growth/amniotic fluid levels
Severe pre-eclampsia
BP >170/110 + proteinuria
or
proteinuria 3+/4+
headache, visual disturbances, blurry vision, papilloedema, RUQ/epigastric pain, hyperrefelxia
platelets <100x10^9/L
abnormal LFTs
HELLP syndrome
Management of pre-eclampsia/eclampsia
4x daily BP monitoring, 2-3x weekly FBC/U&Es/LFTs/renal function
Antihypertensives:
1st line: labetalol
2nd line: nifedipine
Seizure control: Magnesium sulphate (4g loading dose over 5-10min then 1g/h for 24h)
Delivery = only curative treatment, generally try to deliver at >34 weeks
HELLP syndrome
complication of pregnancy presenting in women with pre-eclampsia/eclampsia characterised by: -Haemolysis (H) -Elevated liver enzymes (EL) -Low platelets (LP)
Presentation of HELLP syndrome
nausea&vomiting hypertension brisk tendon reflexes RUQ pain headache oedema
Investigating HELLP syndrome
FBC (↓ Hb, ↓platelets) Blood film (fragmented RBCs) LDH (↑ >600IU/L) LFTs (AST/ALT ↑ >70IU/L) platelets (<100x10^9/L) bilirubin (↑)
Managing HELLP syndrome
definite treatment = delivery of baby
Chorioamnionitis
medical emergency, due to ascending infection leading to inflammation of the foetal membranes
Chorioamnionitis risk factors
Preterm premature rupture of membranes (PPROM)
smoking
alcohol use
↑ number of vaginal examinations
Chorioamnionitis presentation
maternal fever uterine tenderness baseline fetal tachycardia (>160) maternal leucocytosis purulent cervical discharge
Chorioamnionitis management
IV Abx e.g. ampicillin
prompt delivery of fetus
Anaemia in pregnancy
normal physiological changes in pregnancy include the ↑plasma volume causing haemodilution so the Hb drops to ~115g/L
most frequently caused by iron deficiency (↓MCV)
often asymptomatic
screening for anaemia of pregnancy
at booking visit & 28 weeks
definition of anaemia in pregnancy
Hb <110g/L at booking, or Hb <105/L in 2nd/3rd trimester
Management of placenta accreta
C-section (open at site distant to placenta, have blood products ready)
if placenta acreata confirmed do not remove it (high risk of major obstetric haemorrhage), but perform hysterectomy
Polyhydramnios
abnormally large amount of amniotic fluid associated with adverse pregnancy outcomes
uterus presents large for date on examination
Polyhydramnios causes
most often idiopathic congenital abnormalities/genetic disorders Gestational diabetes multiple pregnancy congenital infections
Oligohydramnios
too little amniotic fluid (<500ml at 32-36 weeks) associated with IUGR & ↑perinatal mortality
Oligohydramnios causes
rupture of membranes congenital absence of functional renal tissue (renal agenesis) ↓ renal perfusion post-term gestation placental abruption drugs (ACE-Is, indomethacin) pre-eclampsia PROM
VTE in pregnancy
pregnancy is a physiological hypercoaguable state, leading to a 10x ↑ risk compared to non pregnant women
Risk factors for VTE in pregnancy
hereditary hypercoaguable states e.g. Factor V Leiden obesity (BMI>30) immobilisation previous thrombotic event cancer antiphospholipid syndrome ↑ maternal age pre-eclampsia
VTE management in pregnancy
LMWH (prophylaxis & treatment)
NB IV UFH treatment of choice in acute VTE management
continue treatment till at least 6-12 weeks postpartum
Ectopic pregnancy
fertilised ovum implanting & maturing outside the uterine endometrial cavity, 97% are tubal, most commonly in the ampulla
NB the most dangerous place is an ectopic in the isthmus
Risk factors for an ectopic pregnancy
previous ectopic damage to tubes (e.g. PID) endometriosis IVF IUD/IUS
Ectopic pregnancy presentation
6-8 weeks of amenorrhoea
lower abdo pain/pelvic pain
abdo tenderness on palpation
PV bleeding ± clots
If ruptured: dizziness, fatigue, syncope, haemodynamic instability
Investigating an ectopic pregnancy
beta-hCG
transvaginal USS
if pregnancy of unknown location = serious beta-hCGs
Expectant management for ectopic pregnancy
if size <35mm, unruptured, asymptomatic, no fetal heart beat, serum eta-hCG <1000IU/L
monitor over 48h, if symptoms develop/ ↑ beta-hCG = intervene
Medical management of ectopic pregnancy
if size <35mm, unruptured, no significant pain, no fetal heart beat, serum eta-hCG <1500IU/L
single dose methotrexate
3-6 months of contraception as methotrexate = teratogenic
Surgical management of ectopic pregnancy
if size >35mm, ruptured/unruptured, significant pain, visible fetal heart beat, serum eta-hCG >1500IU/L
usually laparoscopic salpingectomy
laparoscopic salpingotomy if other infertility risk factors
risk of recurrence of ectopic pregnancy
10-20%
Miscarriage
involuntary loss of pregnancy before 24 weeks gestation
Threatened miscarriage
painless PV bleeding at <24 weeks with a closed cervical OS
Inevitable miscarriage
heavy PV bleeding + clots, painful, open cervical OS
Incomplete miscarriage
incomplete expulsion of products of conception, may often be unrecognised missed miscarriage
complete miscarriage
products of contraception fully expelled i.e. no pregnancy tissue on USS
Missed miscarriage
gestational sac containing dead fetus without symptoms of expulsion, often presents with light bleeding + dark brown discharge
recurrent miscarriage
≥3 consecutive pregnancies lost spontaneously at <24 weeks
most common causes include antiphospholipid syndrome, endocrine disorders e.g. PCOS, parental chromosomal abnormalities, cervial incompetence
Investigating miscarriage
Transvaginal ultrasound (TVUS) serum beta-hCG (2 tests 48h apart)
Expectant management of miscarriage
waiting for a spontaneous miscarriage
wait 7-14 days then repeat pregnancy test
Medical management of miscarriage
vaginal misoprostol (stimulates contractions)
review if bleeding not started in 24h
perform pregnancy test 3 weeks later
Surgical management fo miscarriage
vacuum aspiration (suction curettage) or surgical removal (evacuation of retained products of contraception -ERPC)
The law around termination of pregnancy (TOP)
1967 abortion act (amended in 1990)
2 registered medical professionals must sign a legal document (HSA1 form)
TOP legal before 24 weeks gestation
- if it reduces the risk to a woman life
- if it reduces risk to her physical/mental health
- if it reduces the risk of physical/mental health of her existing children
- if baby has substantial risk of being seriously mentally/physically handicapped
No limit to gestational age if
- risk to mother’s life
- risk of grave/permanent injury to mothers physical/mental health
- substantial risk that child born would have such physical mental abnormalities as to be seriously handicapped
Medical termination of pregnancy (TOP)
mifepristone followed after 48h by misoprostol
surgical termination of pregnancy (TOP)
cervical dilation followed by suction of uterine contents
Complete hydatiform mole
benign tumour of trophoblastic material, empty egg fertilised by 1 sperm
features: bleeding in 1st/early 2nd trimester with exaggerated symptoms of pregnancy & a large for date uterus
very high beta-hCG levels
partial mole
normal haploid egg fertilised by 2 sperms/1 sperm with duplicated paternal chromosomes
fetal parts may be seen
Breech presentation
when the caudal end of the fetus occupies the lower segment instead of the cephalic presentation
associated with ↑ morbidity & mortality for mother and baby
Management of breech presentation
offer external cephalic version (ECV) at 36 weeks if nulliparous or 37 weeks if multiparous
if unsuccessful then the mode of delivery is C-section
contraindications for external cephalic version
antepartum ahemorrhage in last 7 days abnormal CTG major uterine abnormality ruptured membranes other indications for c-section
Monoamniotic monozygotic twins risks
↑ risk of spontaneous miscarriage
↑ perinatal mortality
↑ rate of malformation/IUGR/prematurity
↑ risk of twin to twin transfusion syndrome
Fetal movements
first movements usually around 18-20 weeks
Red flag if not established by 24 weeks
Fetal distress
presents as ↓ fetal movements
investigate with handheld doppler to confirm heartbeat
consider USS if no heartbeat
otherwise monitor with CTG
Placenta praevia
defined as placenta overlying the cervial OS i.e. low-lying placenta that is partially/fully inserted into the lower segment
commonest cause of antepartum haemorrhage (bleeding at >24 weeks)
Risk factors for placenta praevia
uterine scarring (e.g. pervious c-section)
multiparity
multiple pregancy
prior placenta praevia
Presentation of placenta praevia
often incidental finding on USS e.g. at 20 week scan
Painless PV bleeding (usually sudden & profuse)
abnormal lie/presentation
NO uterine tenderness
Investigations for placenta praevia
have a high clinical suspicion PV bleeding at >20weeks gestation
TVUS/Abdominal ultrasound
Management of placenta praevia
if major placenta praevia do C-section at 37-38 weeks
if pt has bleeding then encourage hospital admission from 34 weeks
NB do not attempt vaginal examination if pt is actively bleeding
Placenta accreta
describes the attachment of the placenta to the myometrium due to defective decidua basalis, meaning the placenta is unable to properly separate during labour =↑ risk of PPH
Types of placenta accreta
defined by depth of implantation
accreta = attach to myometrium
increta = attach in myometrium
percreta = penetrate into peritoneum
Conditions associated with placenta accreta
retained placental products
PPH
preterm delivery
Risk factors for placenta accreta
previous C-section
placenta praevia
↑ maternal age
Placental abruption
premature separation of a normally located placenta from the uterine wall occurring before delivery of the fetus
Types of placental abruption
concealed: ~20%, haemorrhage confided to uterine cavity, more severe form as blood loss often underestimated
revealed: ~80%, blood draws from cervix, usually less severe, often incomplete detachment of palcenta
Presentation of placental abruption
PV bleeding constant abdo pain uterine contraction level of shock not correlating to visible blood loss tense, tender, woody uterus on palpation
Risk factors of placental abruption
smoking cocaine use trauma multiple pregnancy pre-eclampsia uterine malformation previous abruption
Investigating placental abruption
USS CTG platelet count FBC cross match blood
Management of placental abruption
NB Mother takes priority
fetus alive >36 weeks = emergency c-section if fetal distress otherwise vaginal delviery
fetus alive <36weeks = emergency c-section if fetal distress, otherwise close monitoring + corticosteroids
dead fetus = induced vaginal delivery
Uterine rupture
usually occurs during labour however C-section scars from previous pregnancies may rupture during the 3rd trimester
Dehiscence
incomplete separation of a uterine scar with intact serosa and ↑ risk of uterine rupture
Presentation of uterine rupture
sudden tearing uterine pain vaginal haemorrhage cessation of uterine contractions regression of fetus CTG abnormalities Scar pain/tenderness fetal parts may be palpable per abdomen as they pass into abdominal cavity
Management of uterine rupture
urgent surgical delivery
uterine repair or hysterectomy
Cord prolapse
involved the umbilical cord descending ahead of the presenting part of the fetus, if untreated can lead to cord compression or cord spasm which may cause fatal hypoxia
Risk factors of cord prolapse
prematurity multiple pregnancy breech/transverese lie placenta praevia high fetal station cephalopelvic disproportion artificial rupture of membranes (ARM)*
Presentation of cord prolapse
may occur with no outward physical features/normal fetal heart trace
ill fitting/non presenting part on abdominal examiantion
cord prolapse felt PV
cord visible beyond introitus
abnormal CTG
Management of cord prolapse
pushing presenting part back into uterus to avoid cord compression
use of tocolytics e.g. indomethacin/nifedipine
place pt on all fours (pt in doggy position as she is grown a tail i.e. the cord)
usually need emergency C-section
Most important risk factor for cord prolapse
artificial rupture of membranes (ARM)
Post partum haemorrhage (PPH)
excessive bleeding post delivery, usually defined as >500ml
Types of post partum haemorrhage (PPH)
Primary: within 24h of delivery
Secondary: 24h - 12 weeks after delivery
Causes of primary post partum haemorrhage (PPH)
4T’s of PPH
Tone (uterine atony, ~90% of PPH)
Trauma (to uterus/cervix/vagina)
Tissue (e.g. retained placenta i.e. delayed 3rd stage)
Thrombin (pre-existing/acquired coagulopathies)
Risk factors for primary PPH
previous PPH prolonged labour pre-eclampsia ↑ maternal age emergency C-section placenta praevia/accreta BMI >35 assisted vaginal delivery
Presentation of primary PPH
bleeding which fails to stop after delivery of placenta
signs of shock e.g. hypotension (this is then defined as a major obstetric haemorrhage (MOH), usually >1500ml lost)
Management of primary PPH
ABCDE assessment
bilateral large bore cannulas
cross match blood & make units ready
Medication: syntocinon (5 unit bolus + 40 units IV) TXA (1g IV) Ergometrin (500 micrograms) Carboprost (250 micrograms every 15 min up to 5 doses) Misoprostol (800 micrograms)
Surgical/physical:
Bimanual uterine compression & stimulation
Balloon tamponade
B-lynch compression sutures
ligation of uterine/internal iliac arteries
hysterectomy
Active management of 3rd stage of labour
done to ↓ risk of PPH
5 units of syntocinon IM
consider following with 40 units IV if necessary
Secondary post partum haemorrhage (PPH) causes
infection especially endometritis
retained products of conception
Presentation of secondary PPH
prolonged/excessive bleeding fever abdo pain offensive smelling lochia dyspareunia