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Reproduction > Normal Labour and Puperium > Flashcards

Normal Labour and Puperium Flashcards

1
Q

What is labour?

A

A physiological process during which the fetus, membranes, umbilical cord and placenta are expelled from the uterus

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2
Q

What is labour associated with?

A

Regular, painful uterine contractions with increasing frequency, intensity and duration
Biochemical changes in cervical tissue allowing cervical effacement and cervical dilatation resulting in delivery of the fetus and expulsion of the placenta

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3
Q

What are the 3 key factors in labour?

A

Power: uterine contration
Passage: maternal pelvis
Passenger: fetus

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4
Q

What is the role of progesterone in labour?

A

Keeps uterus settled
Prevents the formation of gap junctions
Hinders the contractibility of myocytes

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5
Q

What is the role of oestrogen in labour?

A

Makes uterus contract

Promotes prostaglandin production

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6
Q

What is the role of oxytocin in labour?

A

Initiates and sustains contractions

Acts on decidual tissue to promote prostaglandin release

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7
Q

Where is oxytocin synthesised?

A

Directly in decidual and extraembryonic fetal tissues and in the placenta
The number of oxytocin receptors increases in myometrial and decidual tissues near end of pregnancy

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8
Q

What occurs in the initiation of labour?

A

Degree of uncertainty
Change in the estrogen/progesterone ratio
Fetal adrenals and pituitary hormones may control the timing of the onset of labour
Myometrial stretch increases excitability of myometrial fibres
Mechanical stretch of cervix and stripping of fetal membranes
Fergusons Reflex

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9
Q

What are some other known causes of possible labour initiation?

A

Pulmonary surfactant secreted into amniotic fluid- reported to stimulate prostaglandin synthesis
Increase in production of fetal cortisol stimulates an increase in maternal estriol
Increase in myometrial oxytocin receptors and their activation results in phospholipase C activity and subsequent increase in cytosolitic calcium and uterine contractility

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10
Q

What occurs in the latent phase of the first stage of labour?

A

Mild irregular uterine contractions, cervix shortens and softens, duration variable of up to a few days. 3-4cm dilatation

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11
Q

What occurs in the active phase of the first stage of labour?

A

4cm onwards to full dilatation
Slow descent of presenting part
Contractions progressively become more rhythmic and stronger

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12
Q

What happens in the second stage of labour?

A

Complete dilatation of cervix (10cm) to delivery of baby
Nulliparous women considered prolonged if it exceeds 3 hours if regional anaesthesia, 2 hours without
Multiparous: 2 hours with ra, 1 without
In low risk care vaginal exam not always carried out

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13
Q

What happens in the third stage of labour?

A

Delivery of baby to expulsion of placenta and fetal membranes
Average duration 10 minutes, can be 3 or longer
After 1 hour prep made for removal under GA
Active management: use of oxytocic drugs and controlled cord traction is preferred for lowering risk of post partum haemorrhage

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14
Q

What is the active management in the third stage of labour?

A

Prophylactic administration of Syntometerine: 1ml ampoule containing 500mg ergometrine maleate and 5IU oxytocin OR oxytocin 10 units
Cord clamping + cutting
Controlled cord traction
Bladder emptying

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15
Q

What cervical softening occur in labour?

A

Cervical softening:
Increase in hyaluronic acid gives increase in molecules among collagen fibres
The decrease in bridging among collagen fibres gives decrease in firmness of cervix.

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16
Q

What cervical ripening occurs in labour?

A

Cervical ripening:
Decrease in collagen fibre alignment
Decrease in collagen fibre strength
Decrease in tensile strength of the cervical matrix
Increase in cervical decorin (dermatan sulphate proteoglycan 2)

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17
Q

What are Braxton Hicks contractions?

A

Tightening of uterine muscle, thought to aid the body prepare for birth
Can start 6 weeks in, usually not felt until 2nd or 3rd trimester
Irregular
Can thin the cervix, but won’t lead to delivery

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18
Q

What is a true labour contraction?

A

Wave
Pain starts low, rises until it peaks, and finally ebbs away. Mothers abdomen will be hard during contraction
Start about 5 minutes apart

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19
Q

How do Braxton Hicks contractions resolve?

A

Ambulation or change in activity

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20
Q

What do contractions do to your uterus and cervix?

A

Tighten top part of uterus pushing baby downward into birth canal
Promotes thinning of cervix

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21
Q

Describe contraction timing

A

Start infrequently and may be noticed at 10-15 minute intervals
Get longer and more intense feeling

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22
Q

What accompanies contractions?

A

Cervical changes, softening, effacement and dilatation

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23
Q

Describe the uterine muscle

A 
Smooth muscle (myocyte) in connective tissue (collagen and elastin)
Density highest at fundus
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24
Q

Describe cervical tissue

A

Collagen tissue mainly (types 1,2,3,4), smooth muscle, elastin
Held together by connective tissue ground substance

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25
Q

Where is the pacemaker of the uterus and cervix?

A

Region of tubal ostia

Wave spreads in a downward direction

26
Q

Do both ostia synchronise?

A

Yes

27
Q

Describe the polarity of contractions

A

Upper segment contracts and retracts, lower segment and cervix stretch, dilate and relax

28
Q

Describe the intensity of contractions?

A

Degree of uterine systole
Max in second stage
Grades: mild, moderate, strong

29
Q

What is the frequency and duration of contractions?

A

Normal up to 3-4 in 10 minutes
Allows time for resting tone
Initially 10-15 secs, max 45

30
Q

What is an anthropoid pelvis?

A

There is an oval shaped inlet with large anterio-posterior diameter and comparatively smaller transverse diameter

31
Q

What is an android pelvis?

A

Android shaped pelvis has triangular or heart-shaped inlet and is narrower from the front. African-Caribbean women are more at risk of having an android shaped pelvis

32
Q

What is the most suitable female pelvic shape?

A

Gynaecoid pelvis

33
Q

What is the liquor?

A

Nurtures and protects fetus and facilitates movement

34
Q

What is the normal position during labour?

A 
Longitudinal lie
Cephalic presentation
Presenting with vertex
OA- head engages occipito-transverse
Flexed head
35
Q

What are the stages of delivery?

A 
Engagement
Descent
Flexion
Internal Rotation
Crowning and extension
Restitution and external rotation
Expulsion, anterior shoulder first
36
Q

How often should vaginal examinations be carried out during labour?

A

Approximately every 4 hours

Should not be carried out inappropriately just for information

37
Q

What is crowning?

A

Appearance of a large segment of fetal head at the introitus

38
Q

How stretched will labia be during crowning/

A

To full capacity

39
Q

What is the largest diameter of the fetal head encircled by during crowning?

A

Vulval ring

40
Q

What parameters can be used to characterise the cervix during labour?

A 
Effacement
Dilatation
Firmness
Position
Level of the presenting part
41
Q

What are the 5 elements of the Bishop score?

A 
Position
Consistency
Effacement
Dilatation
Station in Pelvis
42
Q

What is the Bishop score?

A

Best and simplest method available to determine if it is safe to induce labour

43
Q

What are some analgesia options during labour?

A 
Paracetamol/ Co-codamol
TENS
Entonox
Diamorphine
Epidural
Remifentanyl
Combined spinal/epidural
44
Q

What is a normal blood loss in pregnancy?

A

Volume of less than 500ml

45
Q

What is an abnormal blood loss in pregnancy?

A

Volume greater than 500ml
More significant if greater than 1500ml
At blood loss prior to delivery apart from ‘show’ is abnormal, and requires consultant unit referral

46
Q

What is the plane of placental separation?

A

Spongy layer of decidua basalis

47
Q

What are the methods of placental separation?

A

Matthew Duncan: marginal, the most common type of separation

Schultz: separation from central aspect

48
Q

What 3 signs indicate placental separation?

A

Uterus contracts, hardens and rises
Umbilical cord lengthens permanently
Gush of blood variable in amount

49
Q

When does expulsion of the placenta normally occur?

A

5-10 mins after delivery

Normal is up to 30 mins

50
Q

How is haemostasis achieved in placental separation?

A

Tonic contraction: lattice pattern of uterine muscle strangulates the blood vessels
Thrombosis of the torn vessel: pregnancy is hyper-coagulable state

51
Q

What is puerperium?

A

Period of repair and recovery to non-pregnant stae

52
Q

How long does puerperium last?

A

6 weeks

53
Q

What is lochia?

A

Vaginal discharge containing blood, mucus and endometrial castings
Rubra (fresh red)
Serosa (brownish red, watery)
Alba (yellow)

54
Q

What happens to the uterine weight in uerperium?

A

~1000g reduces to 50-100g

55
Q

What fundal height change occurs in puerperium?

A

Goes from umbilicus to within pelvis in 2 weeks

56
Q

How long does the endometrium take to regenerate following pregnancy?

A

End of a week (except placental site)

57
Q

What structures regress but never go back to pre-pregnancy state?

A

Cervix
Vagina
Perineum

58
Q

When does diuresis commence postnatally?

A

2-3 days

59
Q

What is lactation initiated by?

A

Placental expulsion

60
Q

What hormonal changes occur in puerperium to influence lactation?

A

Decrease in oestrogen and progesterone

Prolactin is maintained

Reproduction (40 decks)

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