Week 4 - D - Medical Complications in Pregnancy - Hypertension, Diabetes, VTE-DVT-PE, Thyroid, Asthma, Epilepsy Flashcards
Most women in pregnancy are healthy however those with medical disorders require expert care from a MDT. What are the three main members in antenatal care? before involving all the sepcialist doctors
GP Obstetrician Midwife Then can have like cardiologist etc
There are a huge number of conditions that can affect pregnancy Antenatal care ensures the optimum health of the mother throughout pregnancy and enables to detect and treat disorders during the pregnancy When was antenatal care first introduced?
Antenatal care was first introduced in 1911
After the pregnancy is confirmed - be it urine or blood HCG measurement What is carried out at the booking antenatal visit?
Discussion about advice regarding pregnancy Identify if patient is high risk (red pathway) or low risk (green pathway) Discuss options for birth place of the child Measure mother height, weight and blood pressure
What week of pregnancy should the first USS be carried out at? What does the USS tell you?
First scan should be carried out at roughly 12 weeks of pregnancy - 11-14 weeks The USS allows you to date the pregnancy - measuring the head circumference, can use biparietal diameter of the foetus or femur length
Why is it important that the first USS scan is accurate for having dating the age of the baby?
it is vital in managing rhesus disease and in diabetic pregnancy
When is the next ultrasound scan carried out after the dating scan?
The anomaly scan is carried out at 20weeks
How often should visits be carried out after 20 week anomaly scan? How often should visits be carried out after 28 weeks? How often should visits be carried out after 36 weeks?
Monthly visits after 20 week anomaly scan Fortnightly visits after 28 tuntil 36 weeks Weekly visits 37 weeks onwards
In mothers who have had possible blood transfusion with the foetus, what immunisation should be given? How much of this should be given if below 20weeks gestational age and if above 20 weeks gestational ge?
Anti-D immunoglobulin should be given to mothers with potential exposure to foetal blood 250 units are given if before 20 weeks gestation 500 units are given if after 20 weeks gestation
What is the prophylactic regiment given for anti-D if pregnant mothers choose to take it? Anti-D immunoglobulin is also administered routinely during the third trimester of your pregnancy if your blood type is RhD negative. This is because it’s likely that small amounts of blood from your baby will pass into your blood during this time. What weeks of gestation is it given at? What muscle is the Anti-D immunoglobulin injected into?
Give 500units of Anti-D at 28 and 34 weeks gestation or a single big dose at 28 weeks The anti-D immunoglobulin is preferably injected into the deltoid muscle (best results for IM injection here)
What are the things checked at each antenatal visit Here are options:
- Accurately document gestation
- Ultrasound scan
- Blood pressure
- Urinalysis
- Serum HCG
- Foetal heart/kicks
- Symphyseal fundal height
- * Accurately document gestation
- * Blood pressure and Urinalysis
- * Foetal heart/kicks
- * Symphyseal fundal height
- Booking visit @ 8-12 weeks
- Dating USS @ 11-12 weeks (hospital)
- Anomaly Scan at 20 weeks
- Monthly visits till 28 weeks
- Anti D - 28 weeks & 34 weeks
- Fortnightly visits 28-36 & Weekly visits 37 weeks onwards
What is the commonest medical problem in pregnancy?
Hyprtension is the commonest medical problem in pregnancy (chronic hypertension or pregnancy induced hypertension)
What is pregnancy induced hypertension with proteinuria also knwon as? (previously known as toxaemia of pregnancy)
This is pre-eclampsia (pre-eclampsia toxaemia is the previous name)
Hypertensive disorders in Pregnancy If the hypertension is present before the 20th week getsation, what is it? If the hypertension presents after the 20th week what is it? When is it pre-eclampsia?
Hypertension present at booking or 20 weeks + significant proteinuria
Hypertensive disorders in Pregnancy 1.Effect on pregnancy 2.Pregnancy effect 3.Medications 4.Delivery 5.Post partum What is thought to be the pathophysiology behind pre-eclampsia?
The spiral arteries of the endometrium are not successfully invaded by the trophoblast - therefore the maternal blood flow to the foetus is poor The mother attempts to increase the blood pressure in an effort to increase placental blood flow resulting in pre-eclampsia
How does the ischaemic placenta result in the widespread endothelial dysfunction in the mother?
The ischemic placenta releases factors which upset the angiogenesis - antiangiogenesis balance leading to endothelial dysfunction in the mother
Pre-eclampsia has a multisystem organ involvement - rain, kidney, liver, eyes, placenta, foetus, others (?) What does pre-eclampsia cause for the renal system due to it causing dmaage? What will be increased in the blood?
Causes a decreased GFR which will cause a build up of creatinine in the blood, also increased serum potassium and urea and uric acid There will be oliguria and proteinuria
WHat effect can pre-eclampsia have on the liver?
Can cause elevated liver enzymes, epigastric/ruq pain and hepatic capsule rupture
The capsule of the liver. A layer of connective tissue surrounding the liver and ensheathing the hepatic artery, portal vein, and bile ducts within the liver What is the name of this capsule? What is the syndrome that pre-eclampsia can cause?
This is Glisson’s capsule The syndrome is HELLP syndrome Haemolysis Elevated Liver enzyme Low Platelet count
How can pre-eclampsia affect the placenta?
Can cause placental abruption IUGR - intra-uterine growth restriction - nutrients and waste not properly exhanged Intra-uterine death
What is placental abruption?
A placental abruption is a serious condition in which the placenta partially or completely separates from your uterus before your baby’s born. The condition can deprive your baby of oxygen and nutrients, and cause severe bleeding that can be dangerous to you both.
What are the investigations used for pre-eclampsia?
Diagnosis and further investigations to see if it has affected other organs
Pre-eclampsia is easily diagnosed during the routine checks you have while you’re pregnant Measure blood pressure and urinalysis for protein
Once diagnosed further investigations are carried out:
- Urea&Electrolytes - raised in serum
- Serum urate
- LFTs elevated
- FBC - low platelets
- Use CTG - cardiotocography
At the booking visit for pre-eclampsia, the risk factors for the mother having pre-eclampsia are assessed What can be given as prophylactic treatment for pre-eclampsia? What supplements are usually given in pregnancy?
Prophylactic treatment:
- 75mg Aspirin given daily if the patient has one high risk or more than 1 moderate risk factor for pre-eclampsia
- Folic acid (400 micrograms) should be taken when trying to conceive and for the first 12 weeks of pregnancy to protect against neural tube defects (NTD), -
- daily 10 micrograms of vitD daily whilst pregnant and breastfeeding
If the patient has hypertension at less than 20 weeks, look for a secondary cause What is the only way to cure pre-eclampsia?
The only way to cure pre-eclampsia is to deliver the baby
What medications used to treat hypertension should be stopped during pregnancy?
Stop ACEinhibitors and ARBs due to increased risk of foetal renal damage
What medications can be used to treat hypertension in pregnancy?
Labetalol Methyldopa / hydralazine Nifedipine
What is the only medicine actually licensed for the treatment of hypertension in pregnancy? Why is methyldopa sometimes contraindicated?
* Labetalol is the only licensed drug for the treatmnet of hypertension in pregnancy * As Methyldopa is an inhibitor of the DOPA-decarboxylase aromatic amino acid which converts L-DOPA to dopamine peripherally - this can lead to potential depression * (DOPA-decarboxylase inhibitors given in parkinsons to reduce peripheral dopamine in an attempt to increase central nervous system dopamine)
What are the routes of administration of labetalol, hydralazine and nifedipine (usually given when monotherapy doesnt work ie a top up)? What are their mechanisms of action?
Labetalol - dual alpha and beta antagonsim - can be given IV or oral Nifedipine - calcium channel blocker - Oral Hydralazine - smooth muscle relaxant and acts as a vasodilator primarily in resistance arterioles - IV Methyldopa can be give oral or IV as well
What BP would anti-hypertensives be given in pregnancy? What is 1st and 2nd line? What is given in a severe hypertensive episode?
Only give anti-hypertensives to treat hypertension in pregnnacy if Bp > 150/100 1st line - labetalol - dual alpha and beta antagonism (used orally here, can be IV when severe hypertension) 2nd line - methyldopa - orally or nifedipine - calcium channel blocker that can be given orally If a severe hypertensive episode (BP - >160/110) - give IV labetalol or IV hydralazine
What is the target blood pressure in pre-eclampsia if no organ damage? What is the target blood pressure in pre-eclampsia if organ damage?
Aim for BP <150/80-100 mmHg If target organ damage (eg. renal damage, causing proteinuria or retinal damage), aim for BP <140/90 mmHg
What maternal organs can pre-eclamspia effect again? What effect can it have on the placenta? IMportant to monitor growth scans of baby
Can affect kidney, liver, eyes, (brain) Can cause placental abruption, IUGR, Intrauterine death
If vaginal delivery in pre-eclampsia, the pregancy is induced at 37 weeks 34 weeks if c-section in pre-eclampsia What is given at 35-36 weeks to help foetal surfactant production as it is immature?
Betamethasone IM given at 35-36 weeks to help foetal surfactant production
When tonic-clonic seizures appear in a pregnant woman with high blood pressure and proteinuria, what is this diagnosis and what is given as treatment?
Eclampsia Magnesium sulphate is given as treatment if seizures do arise