Obs Flashcards
At what point is the uterus palpable in a pregnant patient? At what point does it cross the umbilicus?
12/40
20/40
How can pregnancy be dated with scanning? Specifics!
USS - 14wks bipariatal diameter
What rule allows the dating of pregnancy without a scan? What is it?
Naegele’s rule
1st day of LMP + 7 days + 9 months
Limitation of naegele’s rule
Assumes regular cycles
Assumes can remember 1st day of LMP
Why is dating important in pregnancy
Know when baby is overdue
Know when baby is viable (for resus if over, can abort if under - crude!)
Can monitor for normal development
When would USS first see something in pregnancy?
When would a heart be first detectable?
5 weeks (foetal sac) 6 weeks
What routine USS are done in pregnancy?
When?
Dating 11-14/40
Abnormality 18-20/40
Why should overdue babies be induced? When is it offered?
Placental function decreases
Offer at 40+7
Always at 40+14
What increase should be seen in betaHCG in a normal pregnancy? What do variations in this suggest?
Double every two days
Less than this suggests ectopic
Dropping suggests failing pregnancy
Problems with alcohol in pregnancy
Foetal alcohol syndrome
Increased miscarriage
Problems with smoking in pregnancy
Miscarriage
Preterm labour
Small for date
Placenta pravia and abruption
When should folic acid supplementation commence and end in pregnancy
1 month pre conception until 14 weeks
What should trigger high dose folic acid in pregnancy
Previous neural tube defect Antiepileptics Obese Diabetic HIV +ve on co-trimoxazole
When would a pregnancy test be positive?
Day 9 to 20 weeks
5 days post foetal death or miscarriage
What should be considered when examining a patient with placenta pravia? Concomitant lifestyle advice?
Don’t examine PV
Avoid penetrative sex
Risk factors for placenta previa
>40 Previous c-section Fibroids Multiple pregnancy Multiparity Assisted conception
Management of placenta praevia
Major (covering OS) - needs c-section
Minor - aim for PV but may need c-section
Presentation of placenta praevia
Antepartum haemorrhage
Failure of head to engage
What placental problem can accompany placenta praevia? What is it? Problem?
Placenta accreta
Invasion of the placenta into the myometrium
Heavy bleeding
When should LMWH be considered in pregnancy? Duration?
Two or more risk factors - post labour for 7 days
Three or more risk factors - from as early as possible to 6 weeks post partum
OR
BMI >40 or caesarian - post delivery for 7 days
Dietary advice in pregnancy
Pasturised milk only No ripened or mouldy cheese No pate Undercooked food Raw eggs Raw meat
When will morning sickness generally pass by?n
16-20 weeks
Non pharmacological and pharmacological methods to reduce morning sickness?
Ginger
Wrist accupresure
Antihistamines
Treatment for varicose veins in pregnancy
Compression stockings
What should raise suspicion of candidiasis in vaginal discharge during pregnancy? Treatment?
Itch
Sore
Offensive smell
Dysuria
Topical imidazole. No oral antifungals
Routine bloods on booking
FBC
Group and save
Haemoglobinopathy screen in at risk groups
Hep B, syphalis and HIV screen
What are the screening tests for downs syndrome?
1st trimester (11-13 weeks) perform combined test measuring nuchal translucency with HCG and PrAP-A combined with patient age to stratify risk 2nd trimester (15-20 weeks) perform quadruple test measuring AFP, estriol, HCG, inhibin A and combine with patients age
Above what risk will invasive testing for downs be performed?
1:150
Symptoms of pregnancy
Lethargy
Morning sickness
Amenorrhoea
What should you advise a patient wanting to take nsaids in pregnancy? Why?
Try to avoid and definitely not in 3rd trimester
In utero closure of ductus arteriosus and fetal hypertension
What is hyperemesis gravidarum? Risk factors?
Persistant vomiting in pregnancy with weight loss and ketosis
- young, non-smoker, primip, diabetes, psychiatric illness, family history, multiple pregnancy and molar pregnacy (high HCG)
What complications are patients with hyperemesis gravidarum at risk of?
Dehydration and shock Postural hypotension and collapse Electrolyte disturbance (hypokalaemia and hyponatraemia) Malnutrition Liver and renal failure Hyperthyroidism
Tests in hyperemeisis?
FBC, U+E, LFTs, TFTs
TVUSS (twins? Molar?)
Postural BP
Urine dip
Conservative Treatment of hyperemesis gravidarum
Ginger
Bland food
Rest
Medical treatment of hyperemesis gravidarum in order of use
Thromboprophylaxis Thiamine supplementation IV fluids and urine output Cyclizine Hydrocortisone and prednisolone Parenteral nutrition
Definition of preeclampsia with diagnostic values
Hypertension (>140/90 x3) with proteinuria (dipstick >1+ or 1+ with raised PCR)
Risk factors for pre eclampsia
Maternal age PMH (sle, dm, htn, ckd) FHx Obesity Multiple pregnancy Primip
Management of someone with risk factors of preeclampsia presenting early in pregnancy.
Aspirin if one major (pmh) or 2 minor risk factors from week 12
Presentation of pre-eclampsia?
Asymptomatic Headache, visual disturbance (increased icp) SOB, frothy sputum (pulmonary oedema) PE/DVT (hypercoagubility) RUQ pain (liver capsule stretch) Peripheral oedema Decreased fetal movements (fetal growth restriction) Hyperreflexia
Complications of preeclampsia
Subarachnoid haemorrhage (sudden severe headache)
Placental abruption (severe abdo pain +/- pv bleed)
HELLP
Seizure
Why are preeclamptic patients susceptible to clotting?
Endothelial damage causing renal failure and loss of antithrombin 3, also resulting in DIC
Investigations in suspected preeclampsia
FBC (Hb and platelets) U+E (creatinine and K+) Clotting LFTs (albumin, bilirubin, ALT) Urine dip and MSC CTG / USS
Why do Hb, K and bilirubin in preeclampsia?
Risk of HELLP thus haemolysis
What is HELLP
Haemolysis, elevated liver enzymes, low platelets
What is severe preeclampsia
BP >160/110 or >140/90 with symptoms / severe signs (HELLP, papilloedema, clonus)
Management of severe pre eclampsia
Prophylactic magnesium sulphate
Catheterise and fluid restrict
Decrease BP
Deliver
Drugs to lower BP in pregnancy and contraindication
Nifedipine
Methyldopa - mental health
Labetalol - asthmatics (also decreases hypo awareness)
What medication can be used IV to rapidly lower BP?
Hydralazine
Complications of preeclampsia on delivery?
BP too high - tube causes reflex HTN - stroke
Low platelets - spinal bleeds
DIC - severe PPH snd DVT/PE
What is a complication of magnesium therapy in preeclampsia? Reversal?
Arrhythmia and resp depression
Patients become hyporeflexic
Reverse with calcium gluconate
Definition of primary and secondary PPH
Blood loss of >500ml
1o within 24 hrs of delivery
2o after 24 hrs of delivery
Definition of massive haemorrhage?
> 1.5L not controlled
What four factors contribute to PPH?
Thrombus (lack of!)
Tone (atony!)
Trauma
Tissues (retained!)
Causes of uterine atony resulting in PPH
Exhaustion - prolonged labour, uterine infection
Overstretch - induction, multiple pregnancy, macrosomia, polyhydraminos, fibroids