Obs notes Flashcards
What do primordial follicles contain?
The primary oocyte
What are oocytes?
Germ cells that undergo meiosis to become the mature ovuum ready for fertilisation
What produces b-hCG?
synciotrophoblast
Around what day does implantation occur?
8-10
What week does the fetal heart form and begin to beat?
Around 6 weeks
What week have all major organs began to develop?
8 weeks
What later of the fertilised egg implants into the uterus (and which part?)
The synciotrophoblast implants into the endometrium via finger like projections (chorionic villi)
What are the 5 functions of the placenta?
Respiration, nutrition, excretion, endocrine, immunity
What is the placenta’s role in respiration?
Source of oxygen for the fetus. Fetal haemoglobin has a high affinity for O2, so draws O2 away from the mother across the placental membrane
When do hCG levels plateau?
Around 10 weeks gestation
What is the job of hCG?
Maintains the corpus luteum until the placenta can take over the production of oestrogen and progesterone
What hormones does the placenta produce?
Oestrogen and progesterone
What is the function of the oestrogen being produced by the placenta?
- softens tissues and makes them more flexible
- allows the muscles and ligaments of the uterus and pelvis to expand
- helps cervix become soft and ready for birth
- enlarges and prepares breasts
What is the primary role of progesterone in pregnancy?
To maintain the pregnancy
By what week does the placenta take over progesterone production
Around 5 weeks
How does progesterone maintain the pregnancy?
- relaxation of the uterine muscles (prevents contractions and labour)
- maintains endometrium
What effects does the rise in progesterone have on other parts of the body than the uterus?
- relaxes the lower oesophageal sphincter and causes heartburn
- relaxes the bowel (constipation)
- blood vessels (hypotension, headaches, skin flushing)
- raises body temp by ~1 degree celsius
How does gas exchange occur in terms of the umbilical vessels?
x2 umbilical arteries leave the fetus (deoxygenated), and x1 umbilical vein comes back in (oxygenated). Exchange occurs across the placenta, specifically lacunae
What cardiovascular changes occur in pregnancy?
- increased blood volume
- increased plasma volume
- increased cardiac output (increased stroke volume + heart rate)
- decreased peripheral vascular resistance
- decreased blood pressure in early/middle pregnancy
- varicose veins
- peripheral vasodilation
How does cardiac output, HR and stroke volume change in pregnancy?
Increases
Why might there be ankle oedema and varicose veins in pregnancy?
Enlarged uterus may interfere with venous return
How do tidal volume and respiratory rate change in pregnancy?
Increase
What hormone causes increased tidal volume?
Progesterone
Why might their be some dyspnoea in pregnancy?
Pulmonary ventilation increased by 40%, but oxygen requirements only rise by 20%. Therefore, over breathing can lead to a fall in pCO2 and give a sense of dyspnoea. Can be worsened by elevated diaphragm
What changes occur to the blood in pregnancy?
Increase in coagulant activity, RBC volume increases (plasma more than RBC, so Hb falls), WCC and ESR rise, platelets fall
What occurs to Hb in pregnancy?
Falls, due to plasma increasing more than RBC. Leads to anaemia
Why are pregnant women more at risk of DVT + PE?
Clotting factors such as fibrinogen and factor VII, VIII and X increase in pregnancy, making women hyper-coagulable.
How does ALP change in pregnant women?
Increase a lot due to secretion by the placenta
How does GFR change in pregnancy?
Increases 30-60%
Why is there sometimes trace glycosuria in pregnancy?
Due to increased GFR and reduction in tubular reabsorption of filtered glucose
Is there proteinuria in pregnancy?
Yes
How does changes in hormones affect salt and water retention in pregnancy?
More steroid hormones such as aldosterone, leads to more salt and water retention
How does calcium levels change in pregnancy?
Requirements increase, but so does gut absorption, so levels remain stable
Does hepatic blood flow change?
No
What happens to albumin levels in pregnancy?
Fall
How does the uterus change in size in pregnancy?
Gains a 1kg. Hyperplasia occurs
What are Braxton Hicks? When do they occur?
Non painful ‘practice contractions’, from around 30 weeks
Why might linear nigra occur in pregnancy?
There may be increased skin pigmentation due to increased melanocyte stimulating hormone (alongside ACTH)
What skin changes might be seen in pregnancy?
- striae gravidarum (stretch marks of abdomen)
- general itchiness
- spider naevi
- palmar erythema
What hormones change in pregnancy?
More ACTH, more prolactin, more melanocyte stimulate hormone
What does ACTH rise in pregnancy cause?
Increased cortisol and aldosterone
Why does prolactin rise in pregnancy?
To suppress FSH and LH
What occurs to TSH, T3 and T4 levels in pregnancy?
TSH remains normal, T3 and T4 rise
How might vaginal discharge change in pregnancy?
Increased oestrogen may cause cervical ectropion and increased cervical discharge. Oestrogen also causes hypertrophy of the vaginal muscles and increased vaginal discharge. The changes in the vagina prepare it for delivery, however they make bacterial and candidal infection (thrush) more common.
What do prostaglandins do to the cervix?
Cause breakdown of collagen, allowing dilating and effacing
How many stages of labour are there?
3
What is the first stage of labour?
True contractions until 10cm cervical dilatation
What is the 2nd stage of labour?
10cm cervical dilatation to delivery of the baby
What is the 3rd stage of labour?
Delivery of the baby to delivery of the placenta
What are signs of labour?
Regular and painful uterine contractions, a show (shedding of mucous plug), rupture of membranes, shortening and dilation of the cervix
How often is FHR monitored?
Every 15 mins, or constantly via CTG
How often are contractions assessed in labour?
Every 30 mins
How often is maternal BP and temp checked in labour?
Every 4 hours
How often should a vaginal examination be done in labour?
4 hours
How often should maternal urine be checked for ketones and proteins in labour?
Every 4 hours
How often should maternal pulse rate be assessed in labour?
Every 60 mins
What can be used to induce labour?
Prostaglandin E2 (pessaries can be used)
When does cervical dilation and effacement occur?
In the first stage of labour
What is ‘the show’ and what is its funciton?
Mucus plug in the cervix, prevents bacteria from entering the uterus in pregnancy
How long does stage 1 labour last typically in a primigravida?
10-16 hours
What are the two stages of the first stage of labour?
Latent and active phase
What is the latent phase of labour, and how long should it last?
0-3cm dilation, around 6 hours
What is the active phase of labour, and how long should it last?
3-10cm, normally 1cm/hour
What position should the head enter the pelvis?
Occipito-lateral position
What is the 3 P’s of the second stage of labour?
Power, passenger and passage
How long should the 2nd stage of labour last?
around an hour: if longer consider ventouse/forceps/c-section
What can happen to the baby’s heartrate in the second stage of labour?
Can have transient fetal bradycardia
What does power refer to in the second stage of labour?
Strength of uterine contractions
What does passage refer to in the second stage of labour?
Size and shape of the passageway, mainly the pelvis
What are the 4 qualities of the fetus that can affect the second stage of labour?
Size (particularly head!), attitude, lie, presentation
What are the possible presentations of the fetus?
Cephalic, shoulder, breech
What are the 7 cardinal movements of labour?
Engagement, descent, flexion, internal rotation, extension, restitution and external rotation, expulsion
How is descent measured in labour?
Obstetricians describe the position of the baby’s head in relation to the mother’s ischial spines during the descent phase. Descent is measured in centimetres, from -5 to +5. 0= at level of ischial spines (‘engaged’)
What is physiological management of the third stage of labour?
When the placenta is delivered by maternal effort without medications or cord traction
What requires active management of the third stage of labour?
Haemorrhage, or more than 60 minute delay
What is active management of the third stage of labour?
IM oxytocin to help uterus contract and expel the placenta. Careful traction is applied to the umbilical cord.
What is the definition of gravida vs para?
- gravida: total number of pregnancies
- para: number of times the woman has given birth after 24 weeks (alive or dead)
When does pregnancy technically begin?
From the day of the last menstrual period
When is first trimester?
start of pregnancy to 12 weeks
When is second trimester?
From 13 weeks to 26 weeks
When is second trimester?
27 weeks until birth
When do fetal movements start?
Around 20 weeks
When should a booking clinic happen in pregnancy?
Before 10 weeks
When does the dating scan happen?
Between 10 and 13+6 weeks
What happens at the dating scan?
Accurate gestational age calculated (crown rump length), and multiple pregnancies identified
When should their be antenatal appointments?
16, 25, 28, 31, 36, 38, 40, 41, 42
When does the anomaly scan occur?
Between 18 and 20 + 6 weeks
When is the oral glucose tolerance test for women at risk of gestational diabetes done?
Between 24 and 28 weeks
When are anti-D injections given to rhesus negative women?
Between 28 and 34 wrrks
Who is offered serial growth scans?
Women at risk of fetal growth restriction
When is fetal presentation assessment done?
From 36 weeks onwards
What vaccines are offered to all pregnant women?
Whooping cough and influenza
What vitamins/supplements are recommended and what vitamin should be avoided?
Take folic acid (400mcg) up to 12 weeks, take vitamin D supplements. Avoid vitamin A supplements
Why should vitamin A be avoided in pregnancy?
Teratogenic at high doses
What amounts of alcohol are safe in pregnancy?
No amount is safe
What are the risks of alcohol in early pregnancy?
Miscarriage, small for dates, preterm delivery, fetal alcohol syndrome
What are the features of fetal alcohol syndrome?
Microcephaly, smooth flat philtrum, short palpebral fissure (short distance from one eye to the other), learning disability, behavioural issues, hearing and vision problems, cerebral palsy, thin upper lip
What is the risk of smoking in pregnancy?
Miscarriage, increased risk of preterm labour, increased risk of stillbirth, IUGR, increased risk of sudden unexpected death in infancy
What bloods are booked at the booking clinic (the first midwife appointment)?
Blood group, antibodies, Rhesus D status, FBC for anaemia, screening for thalassaemia + SCD (women at risk)
How many antenatal visits are recommended in the first pregnancy vs subsequent if uncomplicated?
10 and 7
When should iron be started in pregnancy?
Hb <11g/dl
What natural remedies are offered for nausea and vomiting in pregnancy?
Ginger and acupuncture on the p6 point (by the wrist)
What does the combined test for Down’s syndrome test?
Ultrasound and maternal blood tests. Looks at nuchal translucency, and in bloods b-HCG and PAPPA
What levels of b-HCG can indicate downs syndrome?
High result = greater risk
How do levels of PAPPA indicate downs syndrome?
Low result= greater risk
When is the combined test offered?
between 11 and 14 weeks
What is involved in the triple test?
bHCG, AFP, serum oestriol
What levels of AFP and serum oestriol indicate a higher risk of downs?
Lower levels
When is the triple test done?
between 14 and 20 weeks
What is assessed in the quadruple test?
bHCG, AFP, serum oestriol, inhibin A
What levels of inhibin A can indicate risk of downs?
Increased
When is antenatal testing for Down’s offered?
If risk greater than 1 in 150
What antentatal testing for Down’s is done earlier in pregnancy?
CVS (up to 15 weeks)
What is CVS?
Ultrasound guided biopsy of the placenta
What is amniocentesis?
Ultrasound guided aspiration of amniotic fluid
What other disorders are checked for alongside downs?
Edwards (18) and Pataus (13)
What is NIPT?
Non invasive prenatal screening test, which is a blood test from the mother which checks fetal DNA. High sensitivity and specificity
What should be done to dose of levothyroxine in pregnancy?
Increase the dose, as it can cross the placenta and provide thyroid hormone to the developing fetus
How can hypothyroidism affect the fetus?
Miscarriage, anaemia, SGA, pre-eclampsia
What HTN medications should be stopped in pregnancy?
ACE-I, ARBs, thiazide
How much folic acid should women with epilepsy take?
5mg (compared to 400mcg in everyone else)
What can sodium valproate cause in pregnancy?
Neural tube defects, developmental delay
What can phenytoin cause in pregancy?
Cleft lip and palate
Are NSAIDs allowed in pregnancy?
Generally avoided, especially in 3rd trimester, as they can cause premature closure of ductus ateriosus
Why are NSAIDs avoided in pregnancy?
Work by blocking prostaglandins, which maintain the ductus arteriosus, soften the cervix and stimulate uterine contractions at the time of delivery
Even though beta blockers are used in pregnancy, what can they cause?
Fetal growth restriction, hypoglycaemia, bradycardia
Why should ACE-I and ARBs be avoided in pregnancy?
They cross the placenta, and can affect the fetus’ kidneys, and reduce production of urine (oligohydramnios). Can also cause incomplete formation of skull bones
What is neonatal abstinence syndrome?
When babys are going through drug withdrawal after birth
When does neonatal abstinence syndrome occur?
3-72 hours after birth
What are the symptoms of neonatal abstinence syndrome?
Irritability, tachypnoea, high temperature and poor feeding
Can warfarin be used in pregnancy?
No: can cause fetal loss, congenital malformation
What abnormality is Lithium associated with in pregnancy?
Ebstein’s anomaly: the tricuspid valve is set lower on the right side of the heart, causing a bigger right atrium
What acne medication is highly teratogenic?
Isotretinoin
What are the first trimester risks of SSRIs?
Congenital heart defects
What SSRI particularly has risks in the first trimester?
Paroxetine
What can SSRIs in the third trimester be associated with?
Persistent pulmonary hypertension
What are features of congenital rubella syndrome?
Deafness, bilateral cataracts, congenital heart disease, growth issues, purpuric skin lesions, small head, cerebral palsy
If someone is diagnosed with rubella in pregnancy, what (holistic/legal) management is required?
Discuss with local health protection unit
Can MMR vaccines be administered to women known to be pregnant?
No
What increased risks are there to the mother if she encounters chicken pox in pregnancy?
Higher risk of pneumonitis
What is congenital varicella syndrome?
Features: FGR, microcephaly, hydrocephalus, scars and skin changes in specific dermatomes, underdeveloped limbs, cataracts and inflammation in the eye
Can the varicella vaccine be given in pregnancy?
Yes: can check IgG levels to confirm if this is needed (or if planning to go to Tokyo…)
What is the treatment for women who are not immune against chickenpox and exposure?
Give IV varicella immunoglobulins, and if the rash starts give oral aciclovir (if >20 weeks)
When can oral aciclovir be given to women who have chickenpox in pregnancy?
> 20 weeks, and if she presents within 24 hours of rash onset
What causes Listeria, and thus what should be avoided in pregnancy?
Listeria is typically transmitted by unpasteurised dairy products, processed meats and contaminated foods. Pregnant women are advised to avoid high-risk foods (e.g. blue cheese) and practice good food hygiene.
Why is listeria dangerous in pregnancy?
Listeriosis in pregnant women has a high rate of miscarriage or fetal death. It can also cause severe neonatal infection.
What are the features of congenital CMV?
Growth retardation, pinpoint petechial blueberry muffin skin lesions, microcephaly, deafness, seizures
What is the triad of congenital toxoplasmosis?
Intracranial calcification, hydrocephalus, chorioretinitis
What are complications of parvob19 in pregnancy?
Miscarriage, fetal death, severe anaemia, hydrops fetalis, maternal pre-eclampsia
Why does parvovirus B19 infection cause fetal anaemia?
Infection of the erythroid progenitor cells occurs in the fetal bone marrow and liver. This causes less erythropoiesis. This can lead to hydrops fetalis
What is maternal pre-eclampsia like syndrome?
Rare complication of severe fetal heart failure (hydrops fetalis). Triad of hydrops fetalis, placental oedema, and oedema in the mother
What causes rhesus disease?
When a woman is rhesus D negative, there is a chance her baby is Rhesus D positive. The babys blood will enter the mothers bloodstream at some point, and be recognised as foreign. Antibodies will be produced. This is sensitisaton. When the next exposure occurs (eg, next pregnancy), the antibodies can cross the placenta into the fetus, and attack the fetus’ RBCs (causing haemolysis)
When should anti D immunoglobulin be given?
- delivery of Rh+ve infant
- any termination of pregnancy
- miscarriage if gestation >12 weeks
- ectopic pregnancy that is managed surgically
- antepartum haemorrhage
- amniocentesis, CVS, fetal blood sampling
- abdominal trauma
How does anti-D medication work?
The anti-D medication works by attaching itself to the rhesus-D antigens on the fetal red blood cells in the mothers circulation, causing them to be destroyed. This prevents the mother’s immune system recognising the antigen and creating it’s own antibodies to the antigen.
If a rhesus D sensitisation event occurs in 2nd/3rd trimester, what must be done?
Dose of anti-D and perform Kleihauer test (determines proportion of fetal RBC present in mother’s blood)
What are the symptoms of rhesus disease if it affects the baby?
- oedematous (hydrops fetalis, as liver devoted to RBC production so albumin production falls)
- jaundice
- anaemia
- hepatosplenomegaly
- heart failure
- kernicterus
How is fetal size assessed on ultrasound?
Estimated fetal weight and fetal abdominal circumference
What is the definition of severe small for gestation age?
<3rd centile
What is low birth weight definition?
<2500g
What are the two categories of SGA?
Constitutionally small (matches mother + family, growing appropriately on growth chart) and fetal growth restriction
What is fetal growth restriction?
When there is a small fetus due to a pathology reducing the amount of nutrients and oxygen being delivered to the fetus through the placenta
What are the two categories of fetal growth restriction?
Placental mediated growth restriction and non-placenta mediated growth resitrction
What are causes of placenta mediated growth resitrction?
Idiopathic, pre-eclampsia, maternal smoking, maternal alcohol, anaemia, malnutrition, infection, malnutrition, infection, maternal health conditions
What are non placenta mediated growth restriction?
Genetic abnormalities, structural abnormalities, fetal infection, errors of metabolism
What are signs other than SGA that there is fetal growth restriction?
Abnormal doppler studies, reduced fetal movements, abnormal CTGs, reduced amniotic fluid volume
What are short term complications of fetal growth restriction?
Fetal death or stillbirth, birth asphyxia, neonatal hypothermia, neonatal hypoglycaemia
What are the long term complications of fetal growth restriction?
Cardiovascular disease (particularly HTN), T2DM, obesity, mood and behavioural problems
What are risk factors for SGA?
Previous SGA baby, obesity, smoking, diabetes, existing HTN, pre-eclampsia, older mother (other 35), multiple pregnancy, antepartum haemorrhage, antiphospholipid syndrome
When are women assessed for risk factors for SGA?
Booking clinic
What growth monitoring is done for women at low risk of SGA/IUGR?
Symphisis fundal height at every antenatal appointment from 24 weeks. If this <10th centile, they are booked for serial growth scans with umbilical artery doppler
When are women booked for serial growth scans with umbilical artery doppler?
3 or more minor risk factors (RCOG green-top guidelines), 1 or more major risk factor, issue with measuring the symphysis fundal height
When might there be issues with measuring the symphisis fundal height?
Large fibroids or BMI >35
What is measured for women at risk of SGA via serial US/doppler?
- estimated fetal weight and abdominal circumference to determine growth velocity
- umbilical artery pulsality index
- amniotic fluid volume
What investigations are done if a fetus is identified as SGA?
- blood pressure and urine dipstick for pre-eclampsia
- uterine artery doppler scanning
- detailed fetal anomaly scan by fetal medicine
- karyotyping
- test for infection
What definitive management may be done if growth is static on birth charts?
Early delivery to reduce risk of stillbirth
What is the definition of macrosomia?
> 4.5kg at birth
What centile is defined as large for gestational age?
> 90th centile
What are causes of macrosomia?
Constitutional, maternal diabetes, previous macrosomia, maternal obesity or rapid weight gain, overdue, male baby
What are risks to the mother of a macrosomic baby?
Shoulder dystocia, failure to progress, perineal tears, instrumental delivery or caesarean, post partum haemorrhage, uterine rupture
What are risks to the baby of being macrosomic?
Birth injury (Erbs palsy, clavicular fracture, fetal distress, hypoxia), neonatal hypoglycaemia, obesity in childhood and later life, T2DM in adulthood
What are investigations for a large for gestational age baby?
Ultrasound to exclude polyhydramnios and estimate fetal weight, and oral glucose tolerance test for gestational diabetes
What is monochorionic vs dichorionic twins?
One placenta vs two placentas
What sort of multiple pregnancies have the best outcomes?
Diamniotic, dichorionic twin pregnancies (each fetus has their own nutrient supply)
When is multiple pregnancy identified?
Booking ultrasound scan. Can also determine the number of placentas and amniotic sacs at this stage
How are dichorionic diamniotic twins identified on ultrasound scan?
Membrane between the twins with a lambda sign (or twin peak sign)
How are monochorionic diamniotic twins identified on ultrasound?
Have a membrane between the twins with a T sign
What are the risks to the mother in a multiple pregnancy?
Anaemia, polyhydramnios, HTN, malpresentation, spontaenous preterm birth, instrumental delivery/c-section, PPH
What are the risks to the fetuses and neonates in multiple pregnancies?
Miscarriage, stillbirth, fetal growth restriction, prematurity, twin-twin transfusion syndrome, congenital abnormalities
What is twin-twin transfusion syndrome?
When fetuses share a placenta, so there is a connection between the blood supplies of the two fetuses. One fetus recieves more blood, and can become overloaded with heart failure and polyhydramnios. The other has growth restriction, anaemia and oligohydramnios
What is the management of twin-twin transfusion syndrome?
Referral to tertiary specialist fetal medicine centre
What additional blood test is required in twin pregnancy, and why/when?
FBC for anaemia. At booking clinic, 20 weeks, 28 weeks
What additional scans are done in twin pregnancies?
- 2 weekly scans from 16 weeks for monochorionic twins
- 4 weekly scans from 20 weeks for dichorionic twins
When is term for triplets?
Before 35+6
When is term for uncomplicated di di twins?
Between 37 and 37+6
When is term for uncomplicated monochorionic diamniotic twins?
Between 36 and 36+6
When is term for mono mono twins?
Between 32 and 33+6 weeks, c-section
When can there be vaginal delivery in twins?
If diamniotic and the first twin is in a cephalic position
What is a major risk factor of UTI in pregnancy?
Preterm delivery
When are women tested for asymptomatic bacteria in UTI?
Booking clinic
What is seen on urine dipstick of UTI?
- nitrites (produced by E.coli)
- leukocytes (less accurate than leukocytes)
What is the most common causes of UTI?
E.coli, Klebsiella pneuomoniae, enterococcus, pseudomonas aeruginosa
What is the management of UTI in pregnancy?
Nitrofurantoin (until 3rd trimester), amoxicillin, cefalexin
When does nitrofurantoin need to be avoided in pregnancy?
3rd trimester: risk of neonatal haemolysis
Why is trimethoprim avoided in the first trimester of pregnancy?
Folate antagonist: can lead to congenital malformations, neural tube defects
When are women routinely screened for anaemia in pregnancy?
Booking clinic and 28 weeks
What is the presentation of anaemia in pregnancy?
Shortness of breath, fatigue, dizziness, pallor
What are risk factors for VTE in pregnancy?
Smoking, parity >3, age >35, BMI >30, reduced mobility, multiple pregnancy, preeclampsia, gross varicose veins, immobility, family Hx of VTE, thrombophilia, IVF pregnancy
When should VTE prophylaxis be started?
- 28 weeks if 3 or more risk factors
- first trimester if four or more risk factors
What is prophylaxis of VTE in pregnancy?
LMWH (dalteparin, enoxaparin)
When is VTE prophylaxis stopped in pregnancy?
6 weeks post natally, though temporarily stopped when the woman goes into labour
What can be considered in women with C/I to LMWH?
Intermittent pneumatic compression, anti embolic compression stockings
How do DVTs present?
Calf or leg swelling, dilated superficial veins, tenderness to the calf (particularly over deep veins), oedema, colour changes to the leg
Where should leg swelling be examined in queried DVT, and what result is significant?
10cm below the tibial tuberosity. More than 3cm difference is significant
What score is used to calculate risk of DVT?
Wells. 2 points or more =DVT likely, 1 or less = unlikely
What is the management of likely DVT?
- doppler leg ultrasound within 4 hours
- d-dimer
What is the first line management of DVT?
Apixaban or rivaroxaban (DOAC), even in patients with cancer
How long should all patients with a DVT recieve anticoagulation?
At least 3 months. If unprovoked, 6 months total
What are the features of PE?
Chest pain (pleuritic), dyspnoea, haemoptysis, tachycardia, tachypnoea. Chest clear on examination
If a woman is pregnant and has potential DVT but a negative doppler, what is the management?
Repeat on days 3 and 7
What should be done for women with queried PE?
Immediate ECG and CXR
What can be done to diagnosed PE in pregnancy?
CTPA or ventilation perfusion scan
Can you use the wells score in pregnant women?
No: not validated
Do you check d-dimer in pregnant women?
No: will always be raised
Do pregnant women with a confirmed DVT on ultrasound and queried PE, need to be investigated for the PE?
No: treatment is the same
What is the management of DVT/PE in pregnancy?
LMWH (dalteparin)
When should LMWH be started in suspected DVT/PE?
IMMEDIATELY: can be stopped when excluded
If a woman has confirmed VTE event in pregnancy, how long should they have LMWH for?
LMWH is continued for the remained of pregnancy, plus six weeks postnatally, or three months in total (whichever is longer). There is an option to switch to oral anticoagulation (e.g. warfarin or a DOAC) after delivery
Can DOACs be taken in pregnancy?
No: switch to LMWH
What triad is observed in pre eclampsia?
New onset HTN, proteinuria, oedema
What is the definition of pre-eclampsia?
New onset blood pressure > 140/90 after 20 weeks of pregnancy, and 1 or more of proteinuria or other organ involvement
What causes pre-eclampsia?
Spiral arteries of the placenta and the lacunae form abnormally, leading to high vascular resistance.There is also poor perfusion in the placenta, leading to oxidative stress. This releases inflammatory chemicals into the systemic circulation leading to systemic inflammation and impaired endothelial function
If a woman has hypertension before she is pregnant, and then when pregnant technically fits the BP range for pre eclampsia, does this count?
No: this is chronic hypertension
What is the name for hypertension in pregnancy that occurs after 20 weeks with no proteinuria?
Pregnancy induced hypertension
What is eclampsia?
When seizures occur as a result of pre-eclampsia
What are high risk factors for pre-eclampsia?
Pre existing HTN, previous HTN in pregnancy, existing autoimmune conditions, diabetes, chronic kidney disease
What are moderate risk factors for pre-eclampsia?
Older than 40, high BMI, more than 10 years since previous pregnancy, multiple pregnancy, first pregnancy, FHx of pre-eclampsia
What is the prophylaxis for pre-eclampsia and when is it offered?
Aspiring: offered from 12 weeks if one high risk factor or more than one moderate risk factor
What are the symptoms of pre-eclampsia?
Headache, visual disturbance or blurriness, N+V, upper abdo/epigastric pain (due to liver swelling), oedema, reduced urine output, brisk reflexes
How can proteinuria be quantified in pre-eclampsia?
High urine protein:creatinine ratio, or high urine albumin:creatinine ratio
What blood test can be done to investigate pre-eclampsia?
Placental growth factor: it is low in pre-eclampsia
How are all women routinely monitored at antenatal appointments for pre-eclampsia?
Blood pressure, symptoms, urine dipstick
What blood pressure should indicate admission in pregnancy?
Above 160/110 mmHg
What is the blood pressure goal in gestational hypertension in pregnancy?
Below 135/85mmHg
What scoring systems can be used to decide whether to admit a woman with pre-eclampsia?
fullPIERS or PREP-S
How often should fetal ultrasound be done in women with pre-eclampsia?
Every 2 weeks
What is first line management of pre-eclampsia?
Labetalol
What is second line management of pre-eclampsia?
Nifedipine
What is third line management of pre-eclampsia?
Methyldopa
What is used in the management of severe pre-eclampsia or eclampsia?
IV hydralazine (vasodilator)
What is given during labour and the 24 hours after if a woman has diagnosed pre-eclampsia?
IV magnesium sulphate
What should be given to any woman having a premature birth?
Corticosteroids, to help mature fetal lungs
What is the definitive treatment of pre-eclampsia?
Giving birth
What is first line management for pre-eclampsia after giving birth?
Enalapril
What is HELLP syndrome?
Combination of features that occur as a complication of pre-eclampsia and eclampsia. It is Haemolysis, Elevated Liver enzymes, Low Platelets
What are the presenting symptoms of HELLP syndrome?
N+V, right upper quadrant pain, lethargy
What is a s/e of magneisum sulfate that should always be managed?
Respiratory depression: calcium gluconate is first line
What must be monitored after given IV magnesium sulfate in pregnancy?
Urine output, reflexes, RR and oxygen sats
What is the most common medical disorder complicating pregnancy?
Hypertension
When is oral glucose tolerance test done during pregnancy, and who for?
Anyone with risk factors, done at 24-28 weeks, or anyone with previous gestational diabetes (do asap)
What are risk factors for gestational diabetes?
BMI >30 kg/m2, previous macrosomic baby (>4.5kg), previous gestational diabetes, first degree relative with diabetes, family origin with high prevalence of diabetes
What are the diagnostic thresholds for gestational diabetes?
Fasting glucose >= 5.6 mmol/L, and 2-hour glucose is >=7.8 mmol/L (5678)
How is a OGTT performed?
Perform in the morning after a fast. Patient drinks 75g glucose drink. Blood sugar is taken before drinking the sugar drink and at 2 hours
Who should women with gestational diabetes be under the care of?
Join diabetes and antenatal clinic
What is the fasting plasma glucose level that is a cutoff for insulin treatment of gestational diabetes?
<7 mmol/L
What is the management for women with gestational diabetes with fasting glucose <7mmol/l
Trial diet and exercise. If targets not met in 1-2 weeks start metformin, and if still not met add short acting insulin
What is the management of gestational diabetes with fasting glucose >7 mmol/l
Insulin started
What is the management of pre-existing diabetes in pregnancy?
Weight loss if >27 BMI, folic acid 5mg/day, stop oral hypoglycaemia agents except metformin and start insulin, detailed anomaly scan at 20 weeks, treat retinopathy promptly
What are the most significant immediate complications of gestational diabetes?
Large for date fetus and macrosomia
What additional screening should be done for women with diabetes during pregnancy?
Retinopathy: referral to an ophthalmologist to check
When should women with pre-existing diabetes give birth?
Between 37-38+6
What insulin regime is considered during labour for women with type 1 diabetes?
Sliding scale insulin regime
What is a risk for women with existing diabetes after birth?
Hypoglycaemia
What are risks for babies of mothers with diabetes?
Neonatal hypoglycaemia, polycythaemia, jaundice, congenital heart disease, cardiomyopathy
What is the figure that defines neonatal hypoglycaemia?
<2.6mmol/L
What levels can you expect of glucose after birth in a baby?
Transient hypoglycaemia in first few hours is common