Mat Med Flashcards
MoD for women with heart disease - when to consider planned C/S?
- Any disease if the aorta assessed as high risk
- Pulmonary arterial hypertension
- NYHA class III or IV heart disease
WHO heart disease risk class III
III
- mechanical valve
- Fontan circulation
- cyanotic heart disease
- complex congenital heart disease
- Aortic dilatation 40-45mm in Marfans Syndrome
- Aortic dilatation 45-50mm in aortic disease associated with bicuspid aortic valve
WHO heart disease risk class IV:
** Extremely high risk of maternal mortality or severe morbidity; pregnancy contraindicated. If pregnancy occurs, discuss termination.
- pulmonary arterial hypertension (any cause)
- Severe systemic ventricular dysfunction (LVEF < 30%, NYHA III-IV)
- previous peripartum cardiomyopathy with any residual impairment of LVF
- severe symptomatic mitral or aortic stenosis
- Marfan syndrome with aorta > 45mm
- Aortic dilatation >50mm in aortic disease associated with bicuspid aortic valve
- native severe coarctation
New York Heart Association (NYHA) classification of heart failure:
I - no limitation of physical activity
II - slight limitation of physical activity
(Ordinary physical activity results in fatigue, palpitation, breathlessness or angina)
III - marked limitation of physical activity
(Comfortable at rest, less than ordinary activity will lead to symptoms)
IV - inability to carry out any physical activity without symptoms
When can you administer regional anaesthesia for patient taking:
1. Prophylactic LWMH
2. Therapeutic LMWH
- 12 hours after last dose
- 24 hours after last dose
What do you do with steroids in labour for women with primary adrenal insufficiency or taking long term steroids (5mg pred/day)?
- Continue regular steroids
AND
- When established in 1st stage of labour, add IV or IM hydrocortisone + consider minimum dose of 50mg every 6 hours until 6 hours after the baby is born.
What do you do with steroids for women having a planned or EmCS who have primary adrenal insufficiency or are on long term steroids?
- Continue regular oral steroids
- Give IV hydrocortisone when starting anaesthesia, the dose will depend on if the women received hydrocortisone in labour, for example:
a) consider giving 50mg if she has had hydrocortisone in labour
b) consider giving 100mg if she has not had hydrocortisone in labour
Give a further dose of hydrocortisone 6 hours after the baby is born (50mg IM or IV).
Risk of major congenital malformation in women who conceive on Sodium Valproate?
10% risk of major fetal congenital malformation.
No evidence to recommend earlier US than 20/40.
Odds of SGA fetus in medicated epileptic mum vs non medicated epileptic mum?
3.5x higher
Therefore offer growth scans 28, 32, 36 weeks to detect growth restriction.
Malaria:
1. Define uncomplicated and complicated
- Uncomplicated - <2% parasitised RBC’s in a women with no signs of severity and no complicating features
Complicated/Severe - >2% parasitised RBC’s with complicating features (resp distress, pulmonary oedema, hypoglycaemia, secondary gram negative sepsis)
Management of Uncomplicated Malaria:
a) P Falciparum or mixed
b) P vivax
c) P Ovale
d) P malariae
All patients should be admitted to Hospital.
a) P Falciparum or mixed - Quinine + Clindamycin
b) P vivax - Chlorquine
c) P Ovale - Chloroquine
d) P malariae - Chloroquine
Primaquine should not be used in Pregnancy.
Management of complicated malaria
All patients should be admitted to ICU.
All species - IV artesunate or IV quinine
Rubella:
1. Type of virus
2. Transmission
3. Incubation period
4. Infectious period
5. Congenital Rubella
- Togavirus, single stranded RNA genome
- Transmission by resp route
- Incubation period 12-23 days (average 14 days)
- Infectious 1 week before symptoms appear to 4 days after the onset of rash
- Congenital rubella tetratogenic with poor prognosis and significant complications (sensorineural deafness, cataracts, cardiac abnormalities)
Transient neonatal myasthenia gravis
- 20% of infants delivered by mothers with myasthenia gravis
- Caused by maternal antibodies crossing the placenta in the 2nd and 3rd trimesters
- Infants develop symptoms within 12 hours to 4 days after delivery
- Symptoms include: resp problems, muscle weakness, feeble cry, poor suckling, ptosis
- Symptoms resolve spontaneously after 3-4 weeks due to antibody degradation
Incidence of congenital rubella syndrome when contracted in or before 11th week of Pregnancy?
90%
(Rubella causes spontaneous abortion in the first trimester in about 20% of infected women)
Sensitivity of Amnio for diagnosis of fetal CMV infection?
75%
Amnio should not be performed for at least 6 weeks after maternal infection and not until 21/40.
Parvovirus
1. Incubation period
2. Infectivity period
3. Testing
4. Management
- Incubation period 7 days.
- Infectivity period is 7-10 days before the rash develops and 1 day after rash onset
- Parvovirus B19 IgG and IgM
IgG +ve / IgM -ve = immune
IgG -ve / IgM -ve = susceptible
Positive IgM = suggests recent infection
- Arrange urgent referral to FMU for serial fetal US scans and Doppler assessment to detect fetal anaemia, heart failure and hydrops
Parvovirus: risk of vertical transmission?
<15/40 - 15%
15-20 weeks - 25%
Term - 70%
Sickle cell disease: medication considerations
- Stop ACEi/ARB and hydroxycarbamide** pre conception
- Five influenza vaccine
- Folic acid 5mg daily
- Pneumococcal vaccine every 5 years
- Ensure on daily penicillin prophylaxis (Erythromycin if Pen Allergic)
- Aspirin 75mg daily from 12 weeks
- LMWH during hospital admissions
**Hydroxycarbamide has been demonstrated to decrease the incidence of acute painful crises and ACS in individuals with severe clinical manifestations of SCD.
Cervical length and risk of PTB @ 20-24/40.
1. < 25mm
2. < 20mm
- < 25mm - 25% risk of delivery before 28/40
- < 20mm - 42.4% risk of delivery before 32/40
<20mm - 62% risk of delivery before 34/40
Diabetes:
1. Target HbA1c pre conception
2. HbA1c where pregnancy strongly avoided
1.HbA1c < 48mmol/L (6.5%)
- Avoid pregnancy if HbA1c > 86 mmol/L
Incidence of diabetes insipidus?
2-4/100,000
Usually arises 3rd trimester and remits spontaneously 4-6 weeks PP
Diabetes Insipidus - clinical findings ?
- Polydipsia and dilute polyuria
- True polydipsia (drinking > 3L per day) and polyuria (passing > 3L urine per day)
Conditions causing hepatic dysfunction such as HELLP may cause DI to develop.
Diabetes Insipidus: classification
- Neurogenic - CNS pathology, ADH deficiency as reduced production by hypothalamus/post pituitary
- Nephrogenic - Reduced sensitivity of Kidneys to ADH
- Gestational - Transient deficiency ADH
- Psychogenic - Excessive water consumption
Gest HTN in previous pregnancy - risk of hypertensive disorders in future pregnancies?
- Gest HTN
- PET
- Any hypertensive disease
- Gest HTN - 11-15%
- PET - 7%
- Any hypertensive disease - 22%
AFLP
1. Aetiology
2. Incidence
3. Complication
Rare obstetric emergency.
- Deficient LCHAD leading to accumulation of medium and long chain fatty acids
- 5 cases per 100,000 in the UK
- AKI is a common complication. 14% of patients develop renal impairment. 3.5% require dialysis.
T1DM, pre pregnancy:
1. Blood glucose targets
2. HbA1c targets
- Fasting glucose 5-7mmol/L
Plasma glucose 4-7mmol/L before meals - Aim HbA1c < 48mmol/L (6.5%)
Avoid pregnancy if HbA1c > 86mmol/L (10%)
What are:
1. Aspart
2. Lispio
Rapid acting insulin analogues.
- Aspart - Novorapid
- Lispro - Humalog
Long acting insulin in Pregnancy recommendations.
- Use ISOPHANE INSULIN as first choice (Humilin I, Insulatard)
- Use long acting INSULIN ANALOGUES for women with diabetes who have established good blood glucose control before Pregnancy.
-> insulin glargine: Lantus, Toujeo
-> insulin detemir: Levemir
Consider referral to nephrologist in women with diabetes before stopping contraception, if:
- Serum creat > 120mmol/L
- Urine ACR > 30mmol/L
- eGFR < 45
GDM Risk Factors:
- BMI > 30
- Prev GDM
- Prev macrosomic baby > 4.5kg
- 1st degree relative with DM
- Ethnicity
Glycosuria detected by routine antenatal testing;
Consider further testing to exclude GDM in women who have the following:
- Glycosuria of 2+ or above on 1 occasion
- Glycosuria of 1+ or above on 2 or more occasions
At time of diagnosis for GDM;
1. If fasting < 7mmol/L
2. If fasting > 7mmol/L
3. If fasting 6.0 - 6.9mmol/L + macrosomia/poly
- Trial of diet/exercise for 1-2 weeks. If targets not met, add MF. If targets not met with MF, add insulin.
- Immediate insulin, with or without MF. Diet + exercise too.
- Consider, immediate insulin, with or without MF. Diet + exercise.
Frequency of blood sugar testing in T1DM.
- Fasting
- Pre meal and 1 hour post meal
- Bed time
Blood sugar testing in T2DM or GDM:
1. Multiple daily insulin
2. Diet/MF/Single intermediate or long acting insulin dose
- Fasting, pre meal, 1 Hr post meal and bed time
- Fasting, 1 hour post meal
Target blood glucose levels in Pregnancy;
- Fasting < 5.3
- Post meal < 7.8
Advise all women taking insulin to aim for fasting > 4mmol/L.
Pre Existing diabetes- retinal assessment following 1st antenatal clinic apt
- Offer retinal assessment with digital imaging with mydriasis using tropicamide (unless assessment in the last 3 months)
- If diabetic retinopathy- offer additional assessment at 16-20/40.
- Offer another retinal assessment @ 28/40.
Diabetic retinopathy NOT a CI for Vaginal Birth.
Renal assessment during pregnancy in women with pre existing diabetes:
- Refer to nephrologist if:
a) serum creat > 120
b) Urine ACR > 30
c) Total protein excretion exceeds 0.5g/day
Do NOT use eGFR to measure kidney function in Pregnancy.
Consider thromboprophylaxis if nephrotic range proteinuria > 5g/day (urine ACR > 220mg/mmol).
Postnatal fasting plasma glucose:
1. <6mmol/L
2. 6 - 6.9 mmol/L
3. > 7mmol/L
- < 6mmol/L
- low probability of having T2DM
- need annual test to check blood glucose levels
- moderate risk of developing T2DM long term - 6 - 6.9 mmol/L
- High risk of developing T2DM - > 7mmol/L
- likely to have T2DM and offer test to confirm this
Postnatal HbA1c
1. <39
2. 39 - 47
3. > 48
- <39mmol/mol
- low probability of current diabetes
- annual glucose check
- moderate risk of developing T2DM - 39 - 47mmol/mol
- high risk of developing T2DM - > 48mmol/mol
- diagnostic of T2DM and refer for further care
What % of women diagnosed with GDM in Pregnancy willl develop T2DM within 5 years from Birth?
50%
Prevalence of Epilepsy?
Proportion of these women of reproductive age?
0.5 - 1%
1/3 of these women are of reproductive age
Conditions to be considered to ‘no longer have epilepsy’ ?
- Seizure free for 10 years and off AED’s for 5 years
- History of childhood epilepsy in those who have reached adulthood seizure free and treatment free
At what GA do placental changes prevent significant passage of maternal thyroxine across the placenta?
Prior to 12/40, maternal thyroxine (fT4 not fT3) crosses the placenta.
From 12/40 placental changed prevent significant passage of maternal thyroxine and fetal thyroid function becomes independently controlled from the mother.
Incidence of Hyperthyroidism in Pregnancy?
2/1000
Haemophilia A inheritance
X linked genetic condition - clotting factor VIII deficiency
HIV and MoD:
1. < 50 copies
2. 50-399 copies
3. > 400 copies
- Vaginal Delivery
- PLCS considered. Take into account viral load, trajectory, length of time on treatment, adherence.
- PLCS
Hepatic Adenoma:
1. Risk of haemorrhage
2. Risk of rupture
3. Risk of malignant transformation
- Haemorrhage: 27%
- Rupture: 17%
- Malignant Transformation: 5%
When should pharmacological thromboprophylaxis be avoided postpartum in carriers of Haemophilia?
When factor level is 0.6iu/ml or below.
Pharmacological methods of raising factor levels are Txa, DDAVP and recombinant factor VIII/IX.
What % of Myaesthenia Gravis have worsening symptoms during Pregnancy?
40%
Hepatic Adenoma, risk of:
1. Haemorrhage
2. Rupture with intraperitoneal bleeding
3. Risk of malignant transformation
- Haemorrhage: 27%
- Rupture: 17%
- Malignant Transformation: 5%
First line treatment for Myaesthenia Gravis in Pregnancy?
Pyridostigmine - acetylcholine esterase inhibitor
Does not cross the placenta.
Ok if BF.
Sodium Valproate is associated with which congenital malformations?
- Neural tube defects
- Facial cleft
- Hypospadias
Congenital malformations associated with phenytoin and phenobarbital?
Cardiac malformations
Phenytoin + carbamazepine - cleft palate
Risk of congenital malformation for WWE, not on treatment compared to background population risk?
2.8% vs 2.3% background risk
Risk of congenital malformation in those taking Sodium Valproate?
10%
Risk of congenital malformation in WWE taking AED poly therapy?
16.8%
Risk of recurrence of major congenital malformation in WWE with a previous child with major congenital malformation?
16.8%
There was no significant association between epilepsy type and tonic-clonic seizures in the first trimester and major congenital malformations.
Effect of pregnancy on seizures in WWE?
67% do not experience a seizure in pregnancy.
The seizure free duration is the most important factor in assessing the risk of seizure deterioration.
In women who were seizure free for at least 9 months to 1 year prior to Pregnancy, 74-92% continued to be seizure free in Pregnancy.
Risk of tonic clinic seizure in labour ?
1-2%
And a further 1-2% within 24 hours of delivery.
When is prophylactic clobazam considered Intrapartum for WWE?
- Recent convulsive seizures
- Recent history of seizure provocation by stress or sleep deprivation
- History of seizures in a previous labour
The risks of clobazam, such as resp depression in the newborn need to be balanced agains the benefit due to seizure prevention.
Risk of seizure lasting > 5mins in labour ?
1% of pregnancies in WWE.
Optimal management of status epilepticus in labour?
- IV Access
- IV Lorazepam 0.1mg/kg (4mg bolus with a further dose after 10-20 minutes)
- IV Diazepam 5-10mg slow infusion is an alternative - No IV Access
- Rectal diazepam 10-20mg repeated once 15 mins later if there is continued risk of status epilepticus
- Midazolam 10mg as a buccal preparation is suitable
Postpartum management of WWE?
When is period of maximal
Seizure exacerbation?
- 3 day postpartum period
- If AED dose was increased in pregnancy, review within 10/7 to avoid AED toxicity (drowsiness, Diplopia, unsteadiness)
- Risk of adverse cognitive outcomes is not increased in children exposed to AEDs through breast milk
Risk of PP depression in WWE compared to those without?
29% vs 11%
What causes subfertility in women with B thalassaemia?
Fertility may be reduced in transfusion dependent individuals where iron chelation has been suboptimal and iron overload has occurred resulting in damage to the anterior pituitary.
This can cause hypogonadotrophic hypogonadism and therefore individuals may require ovulation induction to achieve a pregnancy.
Safety data re iron chelation therapy in those with Thalassaemia?
- Avoid in first trimester - regard as tetratogenic due to lack of safety data
- Desferrioxamine is the only chelation agent with a body of evidence for use in 2nd and 3rd trimesters.
How to monitor diabetic control
Preconceptually in women with Thalasseamia?
Aim serum fructosamine < 300 mmol/L for at least 3/12 prior to conception.
Equivalent to HbA1c 43
Aim for liver iron in thalasseamia patients pre conception?
< 7mg/g (dry weight)
Recommended because iron chelation is stopped during pregnancy and therefore transfusional iron burden and the risk of iron overload complications increases.
Recommended management if liver iron exceeds 15mg/g (dry weight) prior to conception?
Iron chelation with low dose desferrioxamine should be commenced between 20 - 28/40 under guidance from haemoglobinopathy team.
Incidence of alloimmunity in patients with thalassaemia?
16.8%
Immunisation and antibiotic prophylaxis in women with thalassaemia ?
- Hep B vaccine recommended
- Determine Hep C status
- If Splenectomy:
- ensure penicillin prophylaxis
- vaccinate for pneumococcus and H Influenzae B
Antenatal appointments and US schedule in women with Thalassaemia?
Every 4 weeks until 28/40, then 2 weekly thereafter.
- early scan 7-9/40
- first trimester scan
- anomaly scan
- 4 weekly biometry from 24/40
Antenatal thromboprophylaxis recommendations in women with Thalassaemia?
- Splenectomy OR plt count > 600 = take low dose aspirin
- Splenectomy AND plt count > 600 = prophylactic LMWH + Aspirin
- Women with thalassaemia who are not already using LMWH should be advised to use it during Hospital admissions.
Intrapartum care for women with Thalassaemia considerations?
- If red cell antibodies, ensure C match
- In women with Thalassaemia major, IV desferroxamine 2g over 24 hours should be administered for the duration of labour
- CEFM
- Active mgmt 3rd stage
Drug of choice for malaria prophylaxis in Pregnancy?
Mefloquine (5mg/kg once a week) in 2nd and 3rd trimesters.
Very few areas in the world free from Chloroquine resistance.
Cautions:
Epilepsy
Neuropsychiatric disorders
Previous depression
Hypersensitivity to Mefloquine
Classify severity of Haemophilia by factor plasma concentration:
1. Severe haemophilia
2. Moderate haemophilia
3. Mild haemophilia
- Severe - factor conc < 0.01
- Moderate - factor conc 0.01 - 0.05
- Mild - factor conc 0.06 - 0.40
Neonate (male) with Haemophilia.
Risk of:
1. Intracranial Haemorrhage
2. Extra cranial Haemorrhage
- ICH - 2.5%
- ECH - 3.7%
Maternal Haemophilia Carrier:
- Target factor VIII/IX to cover surgical or invasive procedures or spontaneous miscarriage ?
- Target factor VIII/IX if treatment is required ?
- Aim above 0.5
- Aim above 1.0 and ensure do not fall below 0.5 until haemostasis is secure
Haemophilia - how to optimise factor VIII/IX levels?
- Txa - consider in combination with treatment for those with levels < 0.5 or as sole therapy for those with levels > 0.5 if clinically indicated.
- Desmopressin - can be used antenatally to increase factor VIII levels. (Due to antidiuretic effect, fluids should be restricted to 1L for 24 hours after use)
- Recombinant Factor VII - should be used if levels obtained with DDAVP insufficient or in a known nonresponder.
- Recombinant factor IX - required to cover invasive of surgical procedures in women with factor levels < 0.5
Haemophilia.
What happens to factor VIII and factor IX in pregnancy?
- Factor VIII rises
- Factor IX tends to remain stable
Von Willebrand Disease
- Type 1
- Type 2
- Type 3
- Type 1 - partial quantitative, deficiency of VWF
- Type 2 - qualitative, dominant inheritance, thrombocytopaenia may be exacerbated in pregnancy
- Type 3 - quantitative, virtually absent VWF, significant lower factor VIII levels, recessive inheritance, consanguinity
Von Willebrand Disease, increased risk of:
1. APH
2. Primary PPH
3. Secondary PPH
4. Blood transfusion
5. Mortality
- APH increased 10 fold
- Primary PPH occurs in 15-30% of women
- Secondary PPH occurs in 25% of women
- Need for transfusion increases 5 fold
- Mortality increased 10 fold
Bernard Soulier Syndrome.
- What is the aetiology?
- What is the inheritance?
- What are the maternal risks?
- Management of labour/delivery
- Genetic abnormality of an important platelet adhesion receptor, often associated with a severe bleeding phenotype.
- Autosomal recessive
- Primary PPH, secondary PPH, wound haematoma.
- Plt transfusion prophylactically at delivery or before LSCS, in combination with Txa. (Plts should be HLA matched to reduce alloimmunisation).
- Txa should be given at onset of labour and continued regularly until lochia is minimal.
- DDAVP has variable efficacy and is unlikely to be useful as sole therapy in BSS.
- central neuraxial anaesthesia should be avoided
Glanzmann’s Thrombastenia (GT)
- Aetiology
- Maternal risks
- Fetal risks
- Treatment options
- Disorder of plt function with autosomal recessive inheritance and often associated with severe bleeding tendency
- Intrapartum and PPH. HLA matched plt transfusion and /or recombinant factor VIII should be given prophylactically at delivery.
- DDAVP not effective
- Txa at onset of labour and continued PP
- avoid central nauraxial anaesthesia - Maternal alloimmunisation to paternally derived fetal plt antigens May cause fetal thrombocytopaenia and risk ICH and other fetal bleeding
- Monitor women for Plt specific antibodies at booking, 28 and 34 weeks