2. Fetal presenting part other than vertex includes
breech, face, brow, transverse, and compound
presentation.
3. More than one pregnancy (e.g. Multipara,Grand multipara )
More than one fetus (e.g. Twins)
Too much or too little amniotic fluid (e.g. Polyhydramnious,
oligohydramnios)
Abnormal uterine shape (e.g. Arcuate ,septate, supseptate) or
abnormal growth (e.g Fibroid)
Placenta previa
The baby is preterm
4. the part of the fetus which occupying the
lower uterine segment
Presentation
Presentation may be :
Breech 3 in 100 (3%)
Face 1 in 500 (0.5%)
Brow 1 in 1000
Shoulder 1 in 300 (0.3%)
Compound 1 in 1000
8. The occiput is in the posterior segment of pelvis,
overlying the sacroiliac joint or the sacrum
Occipitoposterior position is responsible for most cases
of prolonged labour and second stage delay and is the
most common cause of a mobile head at term
When the occiput is in front of the sacrum, it is termed
direct Occipitoposterior
In the right Occipitoposterior, the occiput overlies the
right sacroiliac joint and in left Occipitoposterior, it
overlies the left sacroiliac joint
Thus,3 positions are described –ROP, LOP, Direct
Occipitoposterior
9.
10.
11. 1. BACK ON THE RIGHT SIDE
If the back is to the left as in 70% of vertex presentations, the
chance of a posterior position(LOP) is remote
this is because of dextrorotation of uterus and the presence of
sigmoid colon on the left
the foetal back is seen on the right side in 25-30% of vertex
presentations and this predisposes to occipitoposterior(ROP)
2. ANTERIOR INSERTION OF PLACENTA
Favours a posterior position by pushing the back of the head
with the broader biparietal diameter posteriorly
12. 3. SHAPE OF THE BRIM
Influences position
In anthropoid pelvis, the anteroposterior diameter of
the brim exceeds the transverse diameter
This pelvis is usually of high assimilation type with an
extra vertebra in the sacrum
Therefore, inclination of the pelvis is increased and this
favours Occipitoposterior
In android pelvis, the inlet is wedge shaped and so the
bulky occiput cannot find space in the narrow forepelvis
This also predisposes to Occipitoposterior
13. ABDOMINAL EXAMINATION
Subumbilical flattening due to the absence of the back
anteriorly
Back is in one or the other flank and so cannot be felt
clearly
Limbs are felt easily anteriorly
Shoulder is felt out in the flanks
Unengaged or high head at term
The sinciput and occiput may be at the same level due
to deflexion
Fetal heart sounds are heard in the flanks and are
frequently indistinct
14. VAGINAL EXAMINATION
Early in Labour
Early rupture of conical bag of membranes
Sagittal suture in the right oblique diameter of the
pelvis
Smaller posterior fontanelle in the right posterior
quadrant and diamond shaped larger anterior
fontanelle in the left anterior quadrant
As the head is deflexed, both fontanelles are easily
palpated
15. In occipitoanterior position, as the head is well
flexed, the posterior fontanelle will be easily
felt, but not the anterior fontanelle
On the other hand, in Occipitoposterior, the
head is usually deflexed and so the anterior
fontanelle will also be felt with ease
16. LATE IN LABOUR
A large caput may be present obscuring the sutures
The pinna always points the occiput
Perineum gapes much before the head distends it
and premature straining can occur
Difficulty in applying forceps in unrecognised
occipitoposterior
17. Occipitoposterior position is the common
cause for prolonged labour in a vertex
presentation
The mechanism of labour will depend upon
whether the vertex is well flexed. in
occipitoposterior position with a well flexed
head, the occiput being the lower will touch the
pelvic floor first and rotate anteriorly and
labour proceeds normally
18. However due to the longer internal rotation in
occipitoposterior(3/8 of a circle) labour will
naturally be prolonged
In some occipitoposterior positions, the head is
deflexed and this may result in further delay in
rotation or malrotation
19. Deflexion may be due to when the back is
posterior, the convexity of the fetal spine abuts
against the convexity of the maternal spine causing
extension of the head
Hence large diameter present to the pelvic inlet
and the occiput is no longer the leading part. This
is also known as relative disproportion
Another problem is that in OPP, the biparietal
diameter occupies the smaller sacrocotyloid
diameter which is encroached upon by the sacral
promontory
And hence the labour is further arrested
20. Suboccipitofrontal diameter in a deflexed head
is 10.5cm
Occipitofrontal diameter in a head which is
further deflexed is 11.5cm
21. 1. Anterior rotation
In 90% of cases, the occiput rotates anteriorly through
3/8of a circle and the baby is born as occipitoanterior.
Engagement may be delayed and labour may be longer
because of the dorsiflexion
2. Posterior rotation and face to pubis delvery
When the head is deflexed, the engaging diameter is the
occipitofrontal and sinciput is the leading part. Hence
the sinciput touches the pelvic floor first and rotates
anteriorly. The occiput thus rotates posteriorly into the
hollow of sacrum and delivery occurs as face to pubis.
Birth is by extreme flexion followed by extreme
extension
22. Perineal tears are common as the occiput is
posterior and it is the longer biparietal
diameter(9.4), which distends the perineum rather
than the smaller bitemporal(8cm). Hence liberal
episiotomy should be given.
3. Failure of rotation
Persistent occipitoposterior is the absence of
rotation and the head remains ROP or LOP
Deep transverse arrest is defined as the head being
arrested with the sagittal suture in the transverse
diameter at the level of ischial spine, after full
dilatation of cervix and in spite of good uterine
contractions.
23. REASONS FOR FAILURE OF ROTATION
Deflexion of the head
Inefficient uterine contraction
Weak pelvic floor preventing anterior rotation
Cephalopelvic disproportion and android
pelvis
24. Most of the malposition will rotate anteriorly and
the baby will be born spontaneously as occiput
anterior
Alternatively, the may rotate posteriorly and
deliver as face to pubis which need liberal
episiotomy.
As the labour is longer, judicious use of fluids and
analgesia is needed.
Epidural analgesia is ideal.
25. If the mother and baby are in good condition and
labour is progressing well, there is no need for
interference.
A partogram assessment is essential and if
progress is not satisfactory, the most common
cause is inadequate uterine action.
In inadequate uterine action, after excluding
cephalopelvic disproportion, oxytocin
augmentation is very useful in achieving rotation
and delivery
Caesarean section should be done in case of
cehalopelvic dispropotion or if there is no progress
even after oxytocin
26. 1. CAESAREAN SECTION
The pelvis should be reassessed and if the pelvis is
android or there is evidence of disproportion,
CAESAREAN SECTION should be done
Increasing use of caesarean for deep transverse
arrest is to avoid the intracranial haemorrhage due
to traumatic vaginal delivery
27. 2. VACCUM EXTRACTION
This is an alternative in the absence of
cephalopelvic disproportion.
It promotes flexion thereby reducing the diameter
presenting to the outlet from occipitofrontal to
smaller suboccipitobrgmatic.
It is less traumatic and does not need general
anaesthesia
The cup should be applied as near posterior
fontanelle as possible as in order to promote flexion
and smooth descent .
28. 3. MANUAL ROTATION
This procedure can be employed if the obstetrician
is well versed in this technique.
Under the general anaesthesia, the right hand
grasps the sinciput displacing it thereby increasing
flexion.
The smaller bitemporal diameter allows more space
for the thumb and finger to have a firm grasp
across the temple with middle finger on the frontal
suture. In LOP, the left hand is used. Then the
sinciput is rotated and forceps or vaccum is applied
29. 4. FORCEPS ROTATION
In deep transverse arrest Keilland forceps is used.
It should be used only by the obstetrician who are
expert in its use.
It is widely used in UK but it is not popular in India.
Keilland forceps is applied under General
Anaesthesia in the anteroposterior direction and
rotation carried out
30.
31. This is a cephalic presentation where the attitude is one
of complete extension, presenting part is the face (area
between chin and glabella)and denominator is the chin
or mentum.
Primary face presentation: present before the onset of
labour and are rare
Secondary face presentation: caused by extension
during labour.( E.g. . left mentoanterior is a result of
extension of right Occipitoposterior)
34. Maternal
Contracted pelvis
Oblique of uterus
Multiparity and pendulous abdomen
Fetal
Anencephaly and iniencephlaly
Cord round neck
Tumor of neck like congenital goiter
Spasm of sternocleidomastoid muscle
Dolichocephalic head
35. Abdominal examination
In mentoanterior, back is felt with difficulty as it is
posterior and limbs are felt anteriorly
Head remains high
Cephalic prominence is the occiput and on the
same side as the back
Groove between the head and back is prominent
Fetal heart sound are transmited through the chest
and heart well anteriorly in mentoanterior
36. Vaginal examination
Conrical bag of membranes
Chin, mouth, nose, mala eminences, and
supraorbital ridges are felt
In mentoanterior, chin is in one anterior quadrant
and forehead in the opposite posterior quadrant
37. Mentoanterior posterior
1. Engagement
the engagement diameter is submentobregmatic.
In face presentation, the biparietal diameter is 7 cm
behind the face unlike in vertex, where it is only 3-4
cm distance.
The biparietal diameter will pass through the inlet
only when the face is low down in the perineum.
When the face is distending the vulva (crowning),
the head has just engaged.
38. 2. Descent with increasing extension
Descent is brought by the same factors as in vertex
presentation.
When resistance is encountered by a process of
extension, the occiput is pushed towards the back
of the fetus, while the chin descents.
39. 3. Internal rotation
On further descent, the chin reaches the pelvic floor
and rotates anteriorly through 450 towards the
symphysis.
Anterior rotation does not take place until the face
is well applied to the pelvic floor and may be
delayed. Only internal rotation takes place this
manner, can the neck travers the posterior surface
of the symphysis pubis.
40. 4. flexion
The head is born by flexion. The chin pivots under
the symphysis pubis and the mouth, nose, orbits,
forehead, vertex and occiput are born by flexion
5.Restitution and external rotation
Restitution and external rotation of chin occurs
towards the side to which it was originally directed,
and the shoulder are born as in vertex
41. Mentoposterior position
2/3 of cases anteriorly through 3/8 of a circle
and deliver as mentoanterior. Of the rest, some
remain in the oblique diameter and some
rotate posteriorly into the hollow of sacrum.
In these cases of persistent mentoposterior, the
neck is too short to span the 12cm of the
anterior aspect of sacrum.
42. The shoulder also get impacted along with the
head making delivery impossible.
The engaging diameter is the sternobregmatic,
which is about 17cm. Hence, there is no
mechanism of labour in mentoposterior
43. Cause of prolonged labour in face
Face is less effective dilator of cervix
No moulding of face
More chance of premature rupture of membrane
Long internal rotation in mentoposterior
Internal rotation occurs only late in the second
stage
44. complication
Rupture of fetal membranes
cord prolapse → fetal distress →fetal death
edema of the brow
marked moulding , congenital malformation
Increase in maternal and fetal morbidity and mortality
prolonged and complicated labour
Maternal distress … dehydration … keto acidosis
Infection
obstructed labour → uterine rupture
→maternal death
Maternal
complication
Fetal
complication
45. Evaluate the cephalopelvic disproportion or
other associated complication and in such
situation, caesarian section is done.
If there is no disproportion and position is
mentoanterior, labour can be allowed to
progress.
In persistent mentoposterior, cescerian section
is done.
46.
47. It is the least common among cephalic
presentation and most unfavorable.
The attitude is one of partial extension , the
presenting part being the area between the
anterior fontanelle(bregma) above and the
glabella and orbital ridges bellow and
denominator is the forehead or frontum.
49. It is about 1in 1000 birth
The cause is similar to face presentation and
include any factor that interferes with flexion of
the head
50. Possible Etiological causes
Bicornate uterus
Septet uterus
Fibroid uterus
Pelvic tumor
Non gynaecoid pelvis
Maternal
Prematurity
Multiple gestation
Polyhydramnios
Oligohydramnios
Large Fetus
Large Fetal head
Congenital Abnormalities
Cord around the neck
Neck tumor
Fetal
51. - Left fronto-anterior.
- Right fronto-anterior.
- Right fronto-posterior.
- Left fronto-posterior.
52. Abdominal examination
High mobile head, which feels large from side to
side
Cephalic prominence is the occiput and is on the
same side as the back and the groove between the
cephalic prominence and the back is less prominent
than in face presentation
53. Vaginal examination
Conical bag of membrane may be felt in early
labour
Anterior fontanelle(bregma) is felt at one end and
root of nose(nasion)and orbit ridges at the other
end of an oblique or transvers diameter.
Sometimes, the nose and the mouth are palpable,
but not the chin.
54. As such, ther is no mechanism of labour for
persistent brow presentation.
Spontaneous delivery is unlikely and can occur
only when there is a very small baby and large
pelvis.
In persistent brow, the verticomental diameter
is shortened and the occipitofrontal diameter is
elongated with marked moulding and a large
catput on the forehead
55.
56. complication
Rupture of fetal membranes
cord prolapse → fetal distress →fetal death
marked molding
Increase in maternal and fetal morbidity and mortality
prolonged and complicated labour
Maternal distress … dehydration … keto acidosis
Infection
No engagement of presenting part
obstructed labour → uterine rupture →maternal death
Maternal complication
fetal complication
57. Antepartum
It is better to wait until the onset of labour in the
hope that correction to vertex or face.
Early labour
Cesarean section should be done. If diagnosis in
early labour before rupture of membrane, a short
period of time can be given under close supervision
in the hope of spontaneous correction.
58. Late labour
It there is feature of obstructed labour, cesarean
section is performed immediately even if the fetus is
dead.