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Obstetrics > MEDICAL DISORDERS IN PREGNANCY > Flashcards

MEDICAL DISORDERS IN PREGNANCY Flashcards

1
Q

Why are pregnant women more at risk of developing iron deficiency anaemia?

A

Normal physiological changes result in an increased plasma expansion which dilutes the Hb.

Iron requirements are almost tripled during pregnancy.

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2
Q

At what point would anaemia normally be picked up in a pregnant woman?

A

FBC is done at booking appointment (within first 10 weeks) and then repeated at 28 weeks

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3
Q

What Hb levels would prompt treatment on FBC at booking appointment and at 28 week check?

A

Booking: less than 110 g/L

28 weeks: less 105 g/L

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4
Q

What is the main side effect of iron supplements?

A

Constipation

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5
Q

Other than iron supplements, what else can pregnant women with iron deficiency anaemia be advised to do?

A

Vitamin C has been shown to increase iron absorption from the gut, therefore fresh orange juice is recommended.

Tannins found in tea and coffee on the other hand reduce absorption so should be avoided.

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6
Q

What are the complications of prolonged iron deficiency anaemia?

A

Breathlessness

Low birth weight
Preterm delivery

At higher risk of complications from perinatal haemorrhage

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7
Q

What are the complications associated with pre-existing diabetes in pregnancy?

A

Miscarriage

Congenital anomalies in particular cardiac

Fetal macrosomia

Polyhydramnios

Pre-eclampsia

Prematurity

Needing labour induced

Needing caesarian section

Birth trauma

Shoulder dystocia

Stillbirth

Neonatal hypoglycaemia

Obesity and diabetes later in the baby’s life

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8
Q

How is folic acid supplementation different in pre-existing diabetic women looking to conceive compared to non-diabetic women?

A

Non-diabetic women advised to have 400 micrograms each day until 12 weeks gestation

Diabetic women are prescribed 5 mg each day until 12 weeks gestation

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9
Q

What additional ultrasound scans will pregnant women with pre-existing diabetes be offered and why?

A

They are entitled to early USS if they like

In addition, they will have nuchal translucency checked including a detailed assessment of the fetal heart at 20 weeks.

They are then advised to have US growth scans every 4 weeks between 28 and 36 weeks to look for macrosomia and polyhydramnios.

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10
Q

In addition to USS, what monitoring should be done of a pregnant patient with pre-existing diabetes?

A

Patients should have their eyes checked at booking appointment and then at 28 weeks

They should also have regular blood pressure checks and urine dip for proteinuria.

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11
Q

What factors alter glucose metabolism in pregnancy such that pregnancy itself is a state of impaired glucose tolerance?

A

Hormones secreted by the placenta include:

Glucagon

Cortisol

Human placental lactogen

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12
Q

What is the gold standard test used to diagnose gestational diabetes?

A

Oral Glucose Tolerance Test (OGTT) - 75g of glucose administered post fasting and blood glucose levels recorded at 0 and 2 hours

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13
Q

Is there a difference in the definitions (in terms of results from an OGTT) between frank diabetes and gestational diabetes according to NICE?

A

Frank diabetes:

Fasting glucose of more than 7 mmol/L

2 hour level on OGTT of more than 11 mmol/L

Gestational diabetes:

Fasting glucose of more than 5.6 mmol/L

2 hour level on OGTT of more than 7.8 mmol/L

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14
Q

What are the risk factors for developing gestational diabetes?

A

BMI above 30

Previous macrosomic baby weighing more than 4.5kg

Previous gestational diabetes

First degree relative with diabetes

Country of family origin being in South Asia, Caribbean, Middle East.

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15
Q

Who is offered an OGTT in pregnancy and when during gestation will they be offered the test?

A

All those with risk factors should be offered OGTT at 24-28 weeks

All those who have had gestational diabetes previously should be offered OGTT soon after booking and then again at 24-28 weeks if negative

All patients with gestational diabetes should have a fasting plasma glucose arranged 6 weeks post-natally

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16
Q

What are the complications associated with gestational diabetes?

A

Fetal macrosomia

Polyhydramnios

Pre-eclampsia

Prematurity

Needing labour induced

Needing caesarian section

Birth trauma

Shoulder dystocia

Stillbirth

Neonatal hypoglycaemia

Obesity and diabetes later in the baby’s life

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17
Q

How do we treat patients with newly diagnosed gestational diabetes with a fasting glucose of less than 7 mmol/L?

A

Step 1. Changes to diet and exercise regimes

Step 2. Add metformin

Step 3. Add insulin

NB. insulin should be started as first line treatment if the plasma glucose is 6-6.9 mmol/L and there is evidence of macrosomia or polyhydramnios

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18
Q

How do we treat patients with newly diagnosed gestational diabetes with a fasting glucose of more than 7 mmol/L?

A

Start insulin as first line treatment - oral hypoglycaemic agents are not indicated

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19
Q

How do we treat pregnant patients with pre-existing diabetes?

A

All oral hypoglycaemic agents other than metformin should be stopped and insulin should be started

5mg of folic acid should be given from pre-conception to 12 weeks

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20
Q

What is the main concern regarding epilepsy in pregnancy?

A

The fact that anti-epileptic drugs are for the most part teratogenic.

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21
Q

What supplements do we advise all epileptic women looking to conceive to be on?

A

5mg of folic acid

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22
Q

What are the guidelines regarding anti-epileptic therapy during pregnancy?

A

Patients are counselled against stopping medication. Sodium valproate is known to be particularly teratogenic therefore patients may consider swapping medication.

Lamotrigine is recommended for epileptics in pregnancy

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23
Q

Do we change doses of anti-epileptic medications in pregnancy?

A

Reducing dose is normally advised against, unless seizure control has been good for a long period. Doses may even need to be titrated up as increased hepatic metabolism and renal clearance in pregnancy means that levels of drugs are reduced.

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24
Q

In addition to folic acid, what prophylactic supplements should epileptic pregnant on phenytoin be given?

A

Patients on hepatic enzyme inducing drugs (carbamazepine and phenytoin) should be given vitamin K 10 mg orally in the last month of pregnancy.

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25
When in pregnancy is the risk of seizures at its highest?
Labour and the 24 hours following delivery. Epileptics women are advised against having home births.
26
What are the guidelines surrounding breast feeding and anti-epileptic medications?
Breast feeding is considered safe in epileptic mothers taking medications.
27
What is the incidence of congenital abnormalities in mothers taking anti-epileptics compared to non-epileptic mothers?
Non-epileptic: 1-2% Epileptic: 3-4%
28
What percentage of pregnancies are affected by hypothyroidism?
1%
29
What are the clinical features of hypothyroidism in pregnancy?
May be confused with normal symptoms of pregnancy: Lethargy and tiredness Weight gain Dry skin Hair loss Discriminatory symptoms: Cold intolerance Slow pulse rate Slow relaxing tendon reflexes Goitre
30
What are the complications of hypothyroidism in pregnancy?
Miscarriage Reduced intelligence Neurodevelopmental delay Brain damage Up until 12 weeks gestation the fetus relies solely on maternal thyroid hormone.
31
What is the aetiology of most cases of hypothyroidism in pregnancy?
Autoimmune eg Hashimoto's
32
How do we treat hypothyroidism in pregnancy?
Thyroxine is safe in pregnancy and must be adequately titrated. Remember that when interpreting TFTs it is important to use pregnancy adjusted values.
33
What are the clinical features of hyperthyroidism in pregnancy?
Similar to non-pregnancy related hyperthyroidism: Sweating Palpitations Heat intolerance Vomiting Tachycardia Tremor Exopthalmos Goitre Palmar erythema
34
What is the main cause of hyperthyroidism in pregnancy?
Graves' disease
35
Why might be levels of thyroid hormone be raised in the first trimester of pregnancy?
hCG can activate the TSH receptor
36
What are the complications of hyperthyroidism in pregnancy?
Miscarriage Preterm labour Growth restriction Neonatal thyrotoxicosis - due to transplacental passage of thyroid antibodies
37
What are the clinical features of neonatal thyrotoxicosis?
Jaundice Failure to thrive Irritability Heart failure in severe cases
38
How do we treat pregnant patients with hyperthyroidism?
TFTs measured every trimester - assessed using pregnacy adjusted values Anti-thyroid medications such as propylthiouracil (PTU) and carbimazole should be continued or started.
39
How does hyperthyroidism affect breast feeding?
Carbimazole should be avoided in breast feeding mothers. They should be switched to propylthiouracil (PTU).
40
What is thought to be the cause of obstetric cholestasis?
Cholestatic effects of oestrogen and progesterone | Genetic factors
41
What are the risk factors for developing obstetric cholestasis?
``` Family history Chilean descent (up to 5% compared to 0.5% in the UK) ```
42
What are the clinical features of obstetric cholestasis?
Common: Itchy palms and soles of feet and abdomen No rash (this is important) but excoriations from scratching Itching often increases in the evening Less common: Jaundice Darker urine Lighter stools, that are harder to flush Upper right quadrant pain Vomiting
43
What investigations would you do in someone who presents with features of obstetric cholestasis?
LFTs - show raised ALT Bile acids - raised Rule out other causes of deranged LFTs such as doing hepatitis screen, hepatic autoimmune screen, liver ultrasound. Occasionally patients have symptoms but normal LFTs. These patients should have regular blood tests.
44
How do we diagnose obstetric cholestasis?
It is a diagnosis of exclusion. All other causes of deranged LFTs and jaundice should be ruled out first.
45
How do we treat obstetric cholestasis?
Ursodeoxycholic acid for symptom control Sedating anti-histamines such as chlorphenamine and promethazine can be used. Aqueous skin gels can help itch
46
What supplements may be given to pregnant women with obstetric cholestasis if the LFTs are deranged?
Vitamin K supplementation should be provided for those with abnormal clotting, this is to try and reduce PPH
47
What are the risk associated with obstetric cholestasis?
Bile acid levels of more than 40 mmol/L are associated with: Stillbirth Preterm delivery Passage of meconium Fetal anoxia
48
How might a diagnosis of obstetric cholestasis change the management of labour and delivery?
Early induction of labour at 37/38 weeks may be considered on an individual basis.
49
What post-natal care is needed for someone who had obstetric cholestasis?
Ensure LFTs have normalised 10 days post-partum. Warn patients of likelihood of recurrence in future pregnancy Advised to avoid oestrogen containing contraceptive pill as these may trigger cholestasis.
50
What are the risk factors for acute fatty liver of pregnancy?
Primip Carrying male fetus Multiple pregnancy
51
What are the clinical features of acute fatty liver of pregnancy?
Nausea and vomiting Anorexia Malaise Abdominal pain Polyruria Jaundice Ascites Encephalopathy Mild proteinuric hypertension
52
What syndrome is acute fatty liver of pregnancy sometimes difficult to distinguish from?
HELLP syndrome (pre-eclampsia spectrum)
53
What would blood tests of someone with acute fatty liver of pregnancy show?
Raised ALT Raised ALP Raised bilirubin Raised WCC Hypoglycaemia Raised uric acid Coagulopathy
54
How do we treat people with acute fatty liver of pregnancy?
Stabilisation including correction of hypoglycaemia and coagulopathy and fluid resuscitation. Followed by urgent delivery
55
When in pregnancy does acute fatty liver of pregnancy occur?
Third trimester
56
What are the complications of acute fatty liver of pregnancy if not treated?
Death
57
Is pregnancy a pro-thrombotic or anti-thrombotic state?
Pro-thrombotic
58
What makes pregnancy a pro-thrombotic state?
Increase in certain clotting factors Increase in fibrinogen levels Decrease in fibrinolytic activity Decrease in protein S and antithrombin Increased venous stasis in lower limbs (left more than right)
59
What are the risk factors for VTE in pregnancy?
Thrombophilia (Factor V Leiden, Protein C deficiency, antiphospholipid syndrome) Age over 35 BMI over 30 Parity over 3 Smoker Immobility eg surgery or disability Gross varicose veins Multiple pregnancy Medical comorbidities Systemic infection
60
How long after delivery does the risk of VTE remain elevated?
6 weeks
61
What prophylactic steps can be taken to avoid VTE in pregnant women?
LMWH if admitted to hospital or if high risk (eg thrombophilia) Compression stockings if admitted to hospital or travelling
62
What prophylactic treatment do we give women who have had a caesarian section?
7 days of LMWH.
63
How might you investigate a suspected DVT in a pregnant lady?
Dopplers - remember that may be found higher than the calf. This is particularly true in pregnancy.
64
How might you investigate a suspected PE in a pregnant lady?
ECG - sinus tachy ABG - hypoxia and hypercapnia or may reveal respiratory alkalosis FBC - rules out anaemia CXR - rules out other causes of breathlessness
65
What further investigations would you do in a pregnant lady with suspected PE if the chest x-ray was normal?
V/Q scan
66
What further investigations would you do in a pregnant lady with suspected PE if the chest x-ray was abnormal?
CTPA
67
What is the treatment for a pregnant women found to have a DVT or PE?
Therapeutic doses of LMWH | Do not use warfarin in a pregnant women as known to cross placenta and be teratogenic
68
What is the treatment for a puerperium women found to have a DVT or PE?
Therapeutic doses of LMWH can then be converted to warfarin. Warfarin is safe in breast feeding
69
At what point will pregnant women be screened for HIV?
At booking appointment
70
What is the risk of vertical transmission of HIV in an untreated HIV positive women?
25%
71
What is the risk of vertical transmission of HIV is a treated HIV positive women?
1%
72
What additional screening tests will be done in HIV positive women?
Hep C Genital infections - screened in 1st trimester and at 28 weeks Also offer Hep B vaccination Screened for gestational diabetes as is a risk factor of HAART (Highly Active Anti-retroviral Treatment)
73
How should delivery and post natal care of a pregnant patient with HIV be adapted?
Avoid performing invasive procedures such as fetal blood sampling If viral load is less than 50 copies/ml then vaginal delivery will not increase risk. Planned caesarian section is offered though as in general it reduces risk of transmission Those with a high viral load (above 50 copies/ml) will have planned caesarian section with zidovudine cover 4 hours prior to delivery and continued until cord is clamped. Once delivered all neonates started on anti-retrovirals Should not be breastfed Regular tests of baby - negative at 18 months means definitely not affected.
74
What are the risk factors for depression during and after pregnancy?
History of post-natal depression History of depression IVF pregnancy History of abuse Multiple pregnancy Drug misuse Poor social support Low SES Low education Poor pregnancy outcome eg illness, prematurity, stillbirth, neonatal death, congenital abnormality
75
What is the incidence of puerperal psychosis?
1 in every 500 births
76
When does puerperal psychosis usually start?
2 weeks postnatally
77
What are the features of puerperal psychosis?
Mania Delusions Hallucinations (both auditory and visual) Agitation Disinhibited behaviour
78
How do we treat patients with puerperal psychosis?
Admission to hospital for mother and baby to prevent separation. Rule out organic cause Anti-psychotic medication such as haloperidol.
79
Are anti-psychotic medications safe in pregnancy?
It is not fully known. In practice the lowest dose is used with a reduction in dose towards term to prevent toxicity in neonates.
80
Is breastfeeding on antipsychotics safe?
Most of them are fine. Clozapine is contraindicated.
81
What are the congenital abnormality associated with Lithium use in bipolar mothers?
Cardiac defects
82
What are the complications associated with maternal cocaine use during gestation?
Growth restriction Placental abruption Stillbirth Neonatal death
83
What are the complications associated with maternal opioid abuse during gestation?
Growth restriction Preterm labour Neonatal dependence
84
What are the complications associated with smoking during pregnancy?
VTE Growth restriction Placental abruption Cot death Childhood asthma
85
What are the features of fetal alcohol syndrome?
Short palpebral fissure Thin vermillion border/hypoplastic upper lip Smooth/absent filtrum Learning difficulties Microcephaly Growth retardation Epicanthic folds
86
When in pregnancy do women tend to be affected by hyperemesis gravidarum?
Most common between 8 and 12 weeks gestation but may continue until 20 weeks
87
What percentage of pregnant women are affected by hyperemesis gravidarum?
1%
88
What is the cause of hyperemesis gravidarum?
Thought to be related to the raised levels of hCG.
89
What are the risk factors for hyperemesis gravidarum?
Multiple pregnancies Trophoblastic disease Hyperthyroidism Nulliparity Obesity
90
What is a recognised preventative factor for hyperemesis gravidarum that should not really be recommended by physicians?
Smoking
91
How do you manage hyperemesis gravidarum?
First line: Promethazine (anti-histamine) Ginger and P6 (wrist) acupressure can also be tried Admit and give fluids if showing signs of dehydration
92
What are the complications of hyperemesis gravidarum?
Wernicke's encephalopathy Mallory-Weiss tear Central pontine myelinolysis Acute tubular necrosis Small for gestational age (SGA) Pre-term birth

Obstetrics (20 decks)

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