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OBSTETRICS AND GYNAECOLOGY COPY > MALPRESENTATION IN LABOUR > Flashcards

MALPRESENTATION IN LABOUR Flashcards

1
Q

What do we mean by malpresentation towards the end of pregnancy?

A

Any presentation other than a vertex presentation.

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2
Q

What is the vertex in terms of presentation of the fetus?

A

The vertex is the area between parietal eminences and the anterior and posterior fontanelles. The fetus will have its neck flexed with its chin tucked into its chest.

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3
Q

What are the different types of malpresentation?

A

Breech

Shoulder

Face

Brow

Transverse

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4
Q

What are the maternal causes and risk factors of malpresentation?

A

Contraction of the pelvis

Pelvic tumour eg fibroid

Mullerian abnormality

Multiparity

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5
Q

What are the fetoplacental causes and risk factors of malpresentation?

A

Prematurity

Placenta praevia

Polyhydramnios

Multiple pregnancy

Fetal abnormality

Fetal anomaly:
Hydrocephalus
Extension of fetal head by neck tumours
Anencephaly
Decreased fetal tone
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6
Q

What is the most common type of malpresentation?

A

Breech

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7
Q

What is the most important risk factor for breech presentation?

A

Prematurity

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8
Q

What is the incidence of breech presentation in term babies?

A

3%

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9
Q

What is the incidence of breech presentation in babies who are born at 32 weeks?

A

15%

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10
Q

What is the incidence of breech presentation in babies who are born at 28 weeks?

A

25%

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11
Q

What are the three main types of breech presentation? Describe each one.

A

Extended or frank breech presentation - hips are flexed and the knees are extended with feet situated adjacent to the head.

Flexed or complete breech presentation - flexion at both the hips and knees with feet at same level as breech

Footline breech presentation - flexion at both hips and knees but with feet present to the maternal pelvis not the breech

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12
Q

What is the most common type of breech presentation?

A

Extended or frank breech - 50%

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13
Q

If there is doubt about malpresentation from palpation what should be done for the patient?

A

Ultrasound to confirm

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14
Q

What are the complications associated with breech presentations at labour?

A

Increased perinatal mortality and morbidity - usually associated with delivering the head once the rest has delivered.

Intracranial injury - no time for head moulding as head will compress cord

Hypoxic-ischemic encephalopathy

Cord prolapse

Spinal cord injury

Adrenal haemorrhage

Fractures of clavicle or humerus

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15
Q

What is a nuchal arms delivery?

A

This is when the arms get trapped up along with the head and allows for even less space through the pelvis.

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16
Q

What are the three management options for a breech presentation?

A

External cephalic version (ECV)

Elective caesarian section

Planned vaginal breech delivery

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17
Q

What is external cephalic version?

A

This is an attempt to turn the baby inside the womb to cephalic presentation, by massaging the fetus first into transverse lie and then rolling over into the cephalic presentation.

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18
Q

When should external cephalic version be attempted?

A

At 37 weeks.

19
Q

What are the contraindications to external cephalic version.

A

Pelvic masses

Antepartum haemorrhage

Placenta praevia

Previous caesarian section or hysterotomy

Multiple pregnancy

Ruptured membrane

20
Q

What medications should be given if external cephalic version is to be attempted?

A

Tocolytics can be used to reduce uterine activity

Anti-D should be given if mother is rhesus negative

21
Q

What measures should be taken if the mother decides to proceed with a vaginal breech delivery?

A

Check estimated fetal weight - above 4kg should indicate caesarian section

Continuous fetal heart measurement

Must exclude cord prolapse when membranes rupture or if fetal heart rate becomes abnormal

Epidural anaesthesia is recommended because of increased manipulation required.

Routine episiotomy

22
Q

What is the success rate of vaginal breech delivery?

A

About 50% as there is such a low threshold for doing caesarian section that most will never get far enough.

23
Q

What is Lovset’s manoeuvre?

A

This is a manoeuvre performed to keep the spine anterior and aims to reduce the incidence of nuchal arms.

24
Q

What is the Mauriceau-Smellie-Veit manoeuvre?

A

Improves flexion of head to allow easier delivery.

25
Q

What is the definition of unstable lie?

A

This is when, after 37 weeks, the fetal lie is found to be in a different orientation at each palpation.

26
Q

What is the incidence of transverse lie in labour?

A

1 in 500

27
Q

What should you check before doing a vaginal examination of a patient with a fetus in transverse lie?

A

Placenta praevia should be excluded

28
Q

What risk factors particularly increase the likelihood of the fetus being in transverse lie at labour?

A

Multiparity - reduced tone of uterus

Premature labour

The second twin is more likely to be in transverse lie

29
Q

What is the most serious complication of transverse lie?

A

Cord prolapse

30
Q

How do you manage someone who presents with transverse or unstable lie after 37 weeks?

A

Exclude cause of malpresentation such as placenta praevia

ECV can be attempted if no such cause is found and as long as membranes have not ruptured

If reversion to malpresentation occurs or an unstable lie is diagnosed then admission to hospital from 37 weeks is indicated when immediate delivery is possible if membranes rupture.

At term, unstable lie can spontaneously vert to cephalic presentation and this can be managed normally.

ECV followed by immediate induction of labour and artificial rupture of membrane may work

If not caesarian section is indicated

31
Q

What is face presentation?

A

This is when the fetus extends their neck and head rather than flexing.

32
Q

What is the incidence of face presentation?

A

1 in 300

33
Q

What are the risk factors for face presentation?

A

Congenital tumour of the neck

Anencephaly

34
Q

What is the name and diameter of the widest part of the skull during face presentation?

A

Submento-bregmatic - 9.5 cm

35
Q

When is diagnosis of face presentation usually made?

A

Vaginal examination in labour, when supraorbital ridges, bridge of the nose and mouth are palpable

36
Q

Why is face presentation sometimes initially misdiagnosed as breech presentation?

A

The face become oedematous

37
Q

With reference to the chin, what position must the fetus be lying in for vaginal delivery to be successful if face presentation is diagnosed?

A

Mentoanterior position

Mentoposterior position will not work as the head will not be able to be flexed.

38
Q

How do we manage face presentation at labour?

A

Check that it is mentoanterior - initial mentoposterior presentation will spontaneously rotate to mentoanterior presentation in 50% of cases.

If mentoanterior - essentially the same as vertex presentation. Forceps can be used to correct delay.

If mentoposterior and not rotating - caesarian section

If fetal heart abnormalities, proceed to caesarian section as FBS should not be taken from face.

39
Q

What is brow presentation in labour?

A

When the forehead and top of the head engage in the pelvis without head flexion. There is slight extension of the neck but not to the same degree as face presentation.

40
Q

What is the incidence of brow presentation?

A

1 in 500

41
Q

What are the risks and complications of presentation?

A

Early rupture of the membranes

Cord prolapse

42
Q

What is the name and diameter of the widest part of the skull during brow presentation?

A

Submento-vertical - 13.5 cm

43
Q

How do we manage patients with brow presentation?

A

Labour should be monitored but allowed to continue as extension to face presentation or flexion to vertex presentation are the most common outcomes.

Any failure to progress or fetal distress should lead to c-section.

OBSTETRICS AND GYNAECOLOGY COPY (34 decks)

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