Pregnancy Flashcards

1
Q

Below what body fat percentage does ovulation cease?

A

22%.

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2
Q

Below what body mass is amenorrhoea a risk?

A

<47 kg.

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3
Q

List 3 features of the changes of maternal physiology.

A

1) Anticipatory —> precedes foetal growth and demand
2) In excess —> in excess of foetal demand
3) Dynamic —> changes vary through the trimesters

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4
Q

List 3 symptoms that occur due to changes to the renal system during pregnancy.

A

1) Generalised oedema
2) Increased thirst
3) Decreased urine output

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5
Q

List 3 physiological features that occur due to changes to the renal symptoms.

A

1) Increased creatinine output
2) Glucosuria
3) Aminoaciduria

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6
Q

List 2 conditions that are at risk due to changes to the renal system during pregnancy.

A

1) Hydronephrosis (esp. RHS)

2) Pyelonephritis (esp. RHS)

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7
Q

How does total plasma volume change during pregnancy?

A

Increases, 1-2 L (30-50%).

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7
Q

How does plasma osmolality change during pregnancy?

A

Decreases, 280 mosmol/kg (NP) —> 270 mosmol/kg (T).

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8
Q

List 2 natriuretic factors during pregnancy.

A

1) Progesterone

2) Atrial natriuretic peptide

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9
Q

List 4 antinatriuretic factors during pregnancy.

A

1) Aldosterone
2) Renin
3) Angiotensin
4) Deocycorticosterone

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10
Q

Why is eGFR not a valid measure of kidney function during pregnancy?

A

1) Creatinine output increases

2) Plasma creatinine decreases

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11
Q

How does kidney size change during pregnancy?

A

Increases, 20% by term.

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12
Q

List 4 signs that occur due to changes to the cardiovascular system during pregnancy.

A

1) Decreased blood pressure (early/mid pregnancy)
2) Increased blood pressure (late pregnancy)
3) Altered heart sounds
4) Altered ECG trace

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13
Q

List 2 physiological features that occur due to changes to the cardiovascular system during pregnancy.

A

1) Increased cardiac output

2) Increased pulmonary flow

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14
Q

List 2 conditions that are at risk due to changes to the cardiovascular system during pregnancy.

A

1) Dilutional anaemia

2) Thromboembolism

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15
Q

How does cardiac output change during pregnancy?

A

Increases, 30-50%.

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16
Q

How long postpartum does the risk of thromboembolism persist?

A

6-8 months.

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17
Q

Which 3 clotting factors increase during pregnancy?

A

1) VII
2) VIII
3) X

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18
Q

List 7 cardiac anatomical changes that occur during pregnancy.

A

1) Diaphragm elevates 4 cm
2) Heart displaces superiorly and laterally
3) Apex displaces laterally
4) Heart is more horizontal
5) Increased left atrium size
6) Increased left ventricle size
7) Increased ventricular muscle mass

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19
Q

List 4 ECG abnormalities found during pregnancy.

A

1) Lead III —> inverted T wave
2) Lead III —> prominent Q wave
3) Lead aVF —> prominent Q wave
4) 15 degree left axis deviation

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20
Q

List 3 lung function test changes that occur due to changes to the respiratory system during pregnancy.

A

1) Increased tidal volume
2) Increased vital capacity
3) Decreased total lung volume

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21
Q

List 4 respiratory anatomical changes that occur during pregnancy.

A

1) Diaphragm elevates 4 cm
2) Increased subcostal angle (70 degrees (NP) —> 105 degrees (T))
3) Increased thoracic circumference
4) Decreased chest compliance

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22
Q

How does tidal volume change during pregnancy?

A

Increases, 450 ml (NP) —> 650 ml (T), 200ml (40%).

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23
Q

Explain why pregnant women experience subjective dyspnoea.

A

Due to the increased tidal volume, pregnant women take deeper breaths, so they feel as though they are out of breath.

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24
Q

How does total lung volume change during pregnancy?

A

Decreases, 4200 ml (NP) —> 4000 ml (T), 200 ml.

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25
Q

List 5 lung function tests that are unchanged during pregnancy.

A

1) Respiratory rate
2) FEV1
3) FVC
4) FEV1/FVC
5) Peak flow

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26
Q

How does PCO2 change during pregnancy?

A

Decreases, 4.7 kPa (NP) —> 4.0 kPa (T).

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27
Q

Describe how compensated respiratory alkalosis occurs during pregnancy. (6)

A

1) Progesterone mediated increased CO2 sensitivity of respiratory centre chemoreceptors
2) Increased tidal volume
3) Increased CO2 exhaled
4) Decreased PCO2
5) Respiratory alkalosis
6) Excess HCO3- renally excreted

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28
Q

Describe how respiratory alkalosis enables placental CO2 exchange during pregnancy. (5)

A

1) Foetal PCO2 —> 5.0 kPa
2) Maternal PCO2 —> 4.0 kPa
3) Foetal PCO2 > maternal PCO2
4) Foetal:maternal CO2 diffusion gradient
5) CO2 diffusion across placenta

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29
Q

How does oxygen consumption change during pregnancy?

A

Increases, 250 ml/min (NP) —> 300 ml/min (P) (15-20%).

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30
Q

Describe how maternal and foetal erythrocytes enable placental O2 exchange. (4,3)

A

Maternal erythrocytes
1) Increased 2,3-diphosphoglycerate (DPG)
2) Increased DPG O2 binding in M erythrocytes
3) Decreased M erythrocyte O2 affinity
4) Favours M erythrocyte O2 unloading
Foetal erythrocytes
1) F haemoglobin contains 2 alpha and 2 gamma chains
2) Increased F erythrocyte O2 affinity
3) Favours F erythrocyte O2 loading

31
Q

Describe the double Bohr effect during placental O2 exchange. (7)

A

1) Placental CO2 exchange
2) Relative high M CO2
3) Acidic M blood
4) Favours M O2 unloading
5) Relative low F CO2
6) Alkaline F blood
7) Favours F O2 loading

32
Q

List 4 conditions that are at risk due to changes to the gastrointestinal and hepatic system during pregnancy.

A

1) Gastro-oesophageal reflux
2) Aspiration pneumonitis
3) Cholelithiasis
4) Obstetric Cholestasis

33
Q

List 4 symptoms that occur due to changes to the gastrointestinal and hepatic system during pregnancy.

A

1) Constipation
2) Vomiting
3) Excess salivation
4) Altered appetite (inc. pica)

34
Q

Define pica.

A

Ingestion of non-nutritive substances.

35
Q

List 6 reasons why drug metabolism alters during pregnancy.

A

1) Decreased gastric pH
2) Decreased gastric emptying
3) Increased gastric transit time
4) Altered cytochrome P450 enzyme activity
5) Increased ECF volume
6) Increased GFR

36
Q

How does gut transmit time change during pregnancy?

A

Increases, 52 hours (NP) —> 58 hours (P).

37
Q

List 3 conditions that are at risk due to changes to the metabolic system during pregnancy.

A

1) Hyperlipidaemia
2) Gestational diabetes mellitus
3) Diabetes ketoacidosis

38
Q

When does hyperlipidaemia occur during pregnancy?

A

During early pregnancy, to build fat reserves.

39
Q

What is the incidence of gestational diabetes mellitus?

A

1-2%.

40
Q

When is diabetic ketoacidosis likely to occur during pregnancy?

A

Overnight.

41
Q

List 2 anatomical changes that occur due to changes to the reproductive system during pregnancy.

A

1) Increased uterine mass

2) Increased breast volume

42
Q

How does uterine mass change during pregnancy?

A

Increases, 46 g (PT) —> 1012 g (T).

43
Q

List 2 ways how uterine mass increases during pregnancy.

A

1) Smooth muscle hyperplasia

2) Smooth muscle hypertrophy

44
Q

Describe how uroplacental blood flow is established. (4)

A

1) placental extravillous trophoblasts invade uterine decidual spinal arteries
2) Spinal arteries are remodelled
3) Endovascular invasion of placenta
4) Placenta acquires maternal blood supply

45
Q

List 5 conditions that are at risk due to failed endovascular invasion.

A

1) Pre-eclampsia
2) Premature birth
3) Recurrent miscarriage
4) Placental abruption
5) Foetal growth restriction

46
Q

What proportion of maternal deaths are caused by medical and mental health problems versus direct pregnancy complications? (2)

A

1) medical and mental health —> 2/3

2) direct pregnancy complications —> 1/3

47
Q

List 3 considerations during a preconception assessment for a woman with a pre-existing medical condition.

A

1) effect of pregnancy on medical condition
2) effect of medical condition on pregnancy
3) effect of maternal medication on pregnancy

48
Q

List 4 treatment aims during a preconception assessment for a woman with a pre-existing medical condition.

A

1) optimise disease control —> stable
2) rationalise drug therapy —> minimise effects on baby
3) advise on risks to mother and baby
4) effective contraception until ready to conceive

49
Q

List 3 healthcare professionals involved in a joint obstetric-medical clinic.

A

1) obstetrician with medical expertise
2) physician with pregnancy expertise
3) nurse/midwife specialist

50
Q

List 3 advantages of a joint obstetric-medical clinics.

A

1) improved communication
2) loss hospital visits
3) facilitates audits and research

51
Q

List 4 considerations for delivery and postpartum care during a joint obstetric-medical clinics.

A

1) safest mode of delivery
2) neonatal support
3) anaesthetic expertise
4) available HDU/ITU facilities

52
Q

List 2 pregnancy risks due to iron deficiency anaemia.

A

1) low birthweight

2) preterm delivery

53
Q

List 2 pregnancy risks due to asthma.

A

1) foetal growth restriction

2) premature delivery

54
Q

When is an asthmatic exacerbation during pregnancy most likely?

A

3rd trimester.

55
Q

What is the leading cause maternal death during pregnancy?

A

Cardiac disease.

56
Q

List 4 high risk cardiac lesions during pregnancy.

A

1) aortic stenosis
2) coarctation of aorta
3) prosthetic valves
4) cyanosis

57
Q

List 4 low risk cardiac lesions during pregnancy.

A

1) mitral regurgitation
2) aortic regurgitation
3) atrial septal defect
4) ventricular septal defect

58
Q

How do you manage cardiac disease during pregnancy? (5)

A

1) screen for heart failure (echo, ECG)
2) anticoagulation (mechanical heart valves)
3) rationalising drug therapy
4) monitor foetal growth and wellbeing (scans)
5) plan delivery (timing and mode)

59
Q

List 4 pregnancy risks due to hyperthyroidism.

A

1) maternal thyroid crisis with cardiac failure
2) maternal propylthiouracil induced liver failure
3) foetal thyrotoxicosis
3) foetal carbimazole induced abnormalities

60
Q

List 2 pregnancy risks due to hypothyroidism.

A

1) foetal impaired neurodevelopmental

2) foetal death

61
Q

Define gestational diabetes mellitus.

A

Carbohydrate intolerance first recognised in pregnancy.

62
Q

What is the period of risk for developing type 2 diabetes mellitus following gestational diabetes mellitus?

A

Within 10-15 years of pregnancy.

63
Q

How do you manage diabetes mellitus during pregnancy? (5)

A

1) HbA1c < 48 mM
2) folic acid 5 mg
3) stop ACEi and statins
4) retinal screening
5) renal screening

64
Q

List 4 maternal risks associated with diabetes during pregnancy.

A

1) diabetic ketoacidosis
2) hypoglycaemia
3) retinopathy
4) pre-eclampsia

65
Q

List 6 foetal risks associated with diabetes during pregnancy.

A

1) miscarriage
2) prematurity
3) still birth
4) macrosomia
4) foetal abnormalities
5) hypoglycaemia
6) respiratory distress

66
Q

List 3 drugs used for diabetes mellitus during pregnancy.

A

1) insulin (basal bolus regime)
2) metformin
3) glibenclamide

67
Q

List 4 maternal risks associated with chronic kidney disease during pregnancy.

A

1) severe hypertension
2) renal function deterioration
3) pre-eclampsia
4) Caesarean section

68
Q

List 4 foetal risks associated with diabetes during pregnancy.

A

1) prematurity
2) stillbirth
3) growth restriction
4) foetal abnormalities (iatrogenic)

69
Q

List 4 factors that determine the outcome of a pregnancy for a mother with chronic kidney disease.

A

1) degree of renal dysfunction
2) blood pressure
3) creatinine level
4) proteinuria

70
Q

How does seizure frequency change during pregnancy?

A

Increases, 25-33%.

71
Q

Why is SUDEP more common during pregnancy?

A

Increased likelihood of non-compliance to anticonvulsants due to fear of harming baby.

72
Q

List 2 foetal risks associated with epilepsy during pregnancy.

A

1) foetal abnormality (iatrogenic)

2) hypoxia (associated with maternal seizures

73
Q

How do you manage epilepsy during pregnancy? (5)

A

1) high dose folic acid
2) screen for foetal abnormalities
3) control seizures
4) plan for delivery (paint relief)
5) avoid prolonged labour

74
Q

List 5 risks of in utero exposure to valproate. (7)

A

1) spina bifida
2) atrial septal defect
3) cleft palate
4) hypospadias
5) polydactyly
6) reduced IQ
7) autistic spectrum disorder

75
Q

List 3 risk factors for thromboembolism in pregnancy.

A

1) maternal age
2) BMI
3) operative delivery

76
Q

What is the VTE of choice during pregnancy?

A

Low molecular weight heparin.