Medical Disorders in Pregnancy Flashcards
Why is urinalysis for glycosuria not a reliable test for gestational diabetes?
- In pregnancy, kidneys excrete slightly less glucose
- Glycosuria thus may occur at physiological blood glucose concentrations
Define gestational diabetes (NICE 2015)
Carbohydrate intolerance which is diagnosed in pregnancy and may or may not resolve after pregnancy
Define the fasting glucose and glucose tolerance test cut offs for gestational diabetes (NICE)
Fasting glucose level: ≥ 5.6 mmol/L
2 hour-OGTT (75g load): >7.8 mmol
What are the different types of diabetes present in pregnancy and describe how they relate to the incidence of complications
- Pre-existing diabetes (type I or type II)
- Gestational diabetes (glucose levels rising to diabetic levels during pregnancy)
Glucose levels rising are a physiological change in pregnancy
Complications are more present with pre-existing diabetes
Outline some foetal complications of diabetes in pregnancy
Congenital abnormalities
- Neural tube defects
- Cardiac defects
Preterm labour
Reduced foetal lung maturity
Increased birthweight (macrosomia)
- Foetal islet cell hyperplasia –> hyperinsulinaemia –> fat deposition
- This can lead to increased urine output and polyhydramnios (increased liquor) for the mother
Foetal distress in labour (due to increased size)
- Dystocia
- Birth trauma
- Sudden foetal death
Outline some maternal complications of diabetes in pregnancy
Insulin requirements increase by up to 300%, ketoacidosis is rare, hypoglycaemia can occur from attempts to achieve optimum glucose control
- UTIs, wound, endometrial infection following delivery
- Pre-eclampsia is more common
- Pre-existing HTN is more common
- Worsening of pre-existing ischaemic heart disease
- C-section/instrumental delivery more likely
- Diabetic nephropathy
- Diabetic retinopathy
Describe some planning steps for management of pre-existing diabetes in pregnancy
- Consultant based antenatal care
- MDT approach: obstetrician, midwife, GP, dietician
- Education/counselling of glucose control
- Blood glucose monitoring 7 times a day
- Increase dose of metformin/insulin during 2nd half of pregnancy (as insulin resistance increases)
Outline some advice that can be given in pre-conceptual care in pre-existing diabetics
Optimise glucose levels
- HbA1c should be <6.5% (48mmol/mol)
- Pregnancy not advised if HbA1c >10%
- Fasting glucose: 4-7mmol/L
Medication
- Metformin and insulin are appropriate, stop other hypoglycaemic drugs
- Folic acid given
- No ACEi/statins/ARBs
Describe the management of pre-existing diabetes mellitus during pregnancy, with reference to glucose targets
Blood glucose monitoring:
- Morning, before meals, 1hr after meals and at bedtime
Blood glucose targets:
- Pre-meal target < 5.3 mmol/L
- 1-hour postprandial target < 7.8 mmol/L
Metformin/insulin used:
- Doses progressively increased as pregnancy increases
Describe maternal monitoring carried out during and treatment steps to prevent risks of complications during pregnancy for diabetics
- Renal function
- Retinal screening
Treating complications:
- Aspirin, 75mg daily given from 12wks onwards: to reduce risk of pre-eclampsia
- Be wary of diabetic ketoacidosis: medical emergency
Outline the additional foetal monitoring required for women with diabetes mellitus
- Foetal echocardiography
- Ultrasound to monitor foetal growth & liquor volume: 32 and 36 weeks
Describe the management of labour and in the puerperium for women with diabetes mellitus
Delivery
- 37-39 weeks is advised
- Elective C-section when estimated foetal weight >4kg
- During labour: sliding scale of insulin, dextrose
The neonate & puerperium
- Commonly develops hypoglycaemia (as it has become used to a hyperglycaemic state, so its insulin levels are high)
- Respiratory distress syndrome can occur
- Mother’s insulin dose immediately changed to pre-pregnancy levels
- Breastfeeding advised
- Check neonatal blood glucose within 4hrs of birth
Outline some risk factors for gestational diabetes
- Previous history of GDM
- Previous large baby (>4.5kg)
- Unexplained stillbirth
- 1st degree relative with diabetes
- BMI >30
- Ethnicity: south asian, black Caribbean, middle eastern
Outline the indications for gestational diabetes mellitus screening
1 risk factor: OGTT at 24-28wks
Those with previous GDM: OGTT at booking
If the following are detected during pregnancy, OGTT is indicated:
- Polyhydramnios
- Persistent glycosuria
Outline the steps in management for gestational diabetes (from screening –> medical treatment)
Step 1
- Screening, timing depends on presence of risk factors
- If fasting >5.6 or 2h OGTT >7.8 go to step 2
Step 2
- Check HbA1c to identify pre-existing diabetes
- Advise re diet & exercise
- Give home glucometer
- If fasting >7 go to step 4
- If fasting <7, but after 2wks, levels >5.3 before meals OR >7.8 1h after meals: go to step 3
Step 3
- Metformin
- If after 2 wks, levels >5.3 before meals OR >7.8 1hr after meals, go to step 4
Step 4
- Insulin
Rest of treatment same as for pre-existing diabetics
Describe antenatal care, delivery, neonatal and puerperal management for GDM
- Antenatal care and delivery planning same as for pre-existing diabetics
- Neonatal management same (risk of complications is lower than for pre-existing diabetics)
Puerperium:
- Treatment can be discontinued
- Fasting glucose MUST be measured at about 6 weeks post partum (risk of subsequent T2DM is higher)
What are the normal changes in CO in pregnancy, and as a result what is found on cardiovascular examination?
CO increases (by 40%)
- Increased blood flow –> flow ejection systolic murmur
What are common ECG changes in pregnant women?
- Left axis deviation
- Inverted T waves
What are the main cardiac conditions to be aware of in pregnant women?
- Hypertension, valvular disease, ventricular failure (decompensation as a result of increased demands), peripartum cardiomyopathy
- Mild abnormalities: PDA, VSD, ASD
Outline the clinical presentation of cardiac disease in pregnancy
• Assess new/deterioration of symptoms → SOB, palpitations, orthopnoea, paroxysmal nocturnal dyspnoea,
decreased exercise tolerance, chest pain
- General → pulse (tachy, thread, collapsing), BP (high or low), JVP raised, oedema, cyanosis
- Chest → ejection systolic murmur common in pregnancy
Outline the general preconceptual, antenatal and intrapartum management of cardiac disease
Pre-conceptual
- Assess cardiac risk (cardiac assessment with echo): address relative risks and contraindications
- Optimise medication: e.g the following are contraindicated: warfarin, ACEi
Antenatal
- Monitor foetal well being (foetal cardiac abnormalities detected in 20 week USS)
- Consider thromboprophylaxis (LMWH)
Intrapartum:
- Pay attention to fluid balance (uterine involution squeezes fluid into circulation)
- Consult with anaesthetists: epidurals reduce after load
Describe the management/outline the risks for the following:
pulmonary hypertension, cyanotic heart disease (without PHTN), valvular disease, peripartum cardiomyopathy
Pulmonary hypertension
- Pregnancy contraindicated/termination offered
- High maternal mortality
Cyanotic heart disease (without PHTN)
- Risk of embolism
- Anticoagulation required
Aortic stenosis/mitral valve disease
- Severe AS: should be corrected before pregnancy (beta blockers)
- Anticoagulation for metallic heart valves
Peripartum cardiomyopathy (HF specific to pregnancy)
- Risk of maternal mortality and permanent LV dysfunction
- Supportive treatment: diuretics, ACEi
Outline the prognosis of cardiac disease in pregnancy
- Leading cause of maternal death in the UK
- Important to be managed appropriately during all points in pregnancy (pre-conception to postpartum)
Grade both severe and life threatening asthma with the following domains: PEFR (%), pulse (bpm), RR (bpm), clinical presentation
Severe attack:
- PEFR <50%
- Pulse >110bpm
- RR > 25
- Inability to complete sentences
Life threatening attack:
- PEFR <33%
- Silent chest, cyanosis, bradycardia, hypotension, confusion, coma
What is the standard medical management for asthma?
Step 1 – inhaled SABA PRN (salbutamol)
Step 2 – + regular inhaled ICS (400mcg/day)
Step 3 – + LABA/increase ICS to 800mcg/day
Step 4 – ICS 2000mcg/day and + LTRA, theophylline or beta 2 agonist
Step 5 – + oral steroids
Describe the management of asthma during pregnancy
- Drugs shouldn’t be withheld, as they’re generally safe and severe asthma attacks could be lethal
- Steroid increase during labour
What are potential complications of asthma attacks during pregnancy?
- Prolonged hypoxia –> IUGR –> foetal brain injury• Oral • • • Corticosteroids use in first trimester increases cleft lip risk
- Preterm birth
- Perinatal mortality
Outline the acute management of an asthma attack
- Resus, monitor O2, ABG and PEFR
- High flow oxygen, neb salbutamol (5mg initially continuous, then 2-4hourly), ipratropium 0.5mg QDS
- Steroid therapy (100-200 IV hydrocortisone, then 40mg PO prednisolone 5-7 days)
- IV magnesium sulphate if not improvement, consider IV aminophylline or IV salbutamol
- Summon anaesthetic help if pt getting exhausted PCO2 increasing
Discharge when PEFR >75% of pts best, diurnal variation <25%, stable on discharge meds for 24h
What are the main considerations for women with epilepsy who are pregnant?
- Seizure control deteriorates in pregnancy
- Anti-epileptic drugs should be continued (due to increased mortality risk of epilepsy)
- However, risk of congenital abnormalities is increased with medication
(Dose dependent, higher with multiple drug usage, higher with certain drugs, e.g sodium valproate)
Outline the antenatal management of epilepsy in pregnancy
- Regular assessment for risk factors or triggers for seizures: sleep deprivation, stress, adherence to AEDs,
seizure type and frequency - Growth scans
- Anti-epileptics: fewest drugs possible at lowest therapeutic dose
- Folic acid
- Ideally avoid sodium valproate: carbamazepine, lamotrigine are safer
Pre-conceptually, outline contraceptive management in patients taking anti-epileptics
If pt taking enzyme inducing anti-epileptics (e.g phenytoin, carbamazepine, phenobarbitals):
- Promote copper IUDs, Mirena and injections
- Caution with OCP, patches, implants
If on non-enzyme inducing AED (e.g sodium valproate, levetiracetam, gabapentin, pregabalin):
- Offer any form of contraceptive
What needs to be considered if a woman is presenting with seizures for the first time during pregnancy?
Remember eclampsia:
- 1st seizures, 2nd half of pregnancy: follow protocol for eclampsia management until a full neurological assessment is done
Outline the complications of hypothyroidism in pregnancy
- Increased risk of mortality
- Miscarriage, preterm delivery
- Intellectual impairment in the child
- Slight increased risk of pre-eclampsia
Describe the management of hypothyroidism in pregnancy
- Important to monitor during first 12 weeks due to dependency on maternal hormones – cretinism is risk
- TFTs regulated: TSH kept in lower 1/2 of normal <2