obstetrics- malpositions and malpresentations
TRANSCRIPT
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MALPOSITIONS AND
MALPRESENTATIONS –
OCCIPITOPOSTERIOR, FACE, BROW,
SHOULDER
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OCCIPITO-POSTERIOR
•Vertex presentation•Occiput in post. Segment of pelvis overlying the sacroiliac jt and sacrum• 3 positions described:1. Right occipitoposterior2. Left occipitopoterior3. Direct occipitoposterior
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AETIOLOGY SHAPE OF PELVIC INLET- anthropoid or
android pelvis
FETAL FACTORS- marked deflexion- 1) high pelvic inclination 2) placenta on ant. Wall of uterus 3) back on the right side
UTERINE FACTORS- abnormal uterine contractions
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DIAGNOSIS ABDOMINAL EXAMINATION Subumbilical flattening Back is in one or the other flank so clinically
not felt Limbs felt anteriorly Shoulder in flanks Unengaged or high head at term Occiput and sinciput at same level Fetal heart sounds in the flanks and are
frequently indistinct
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VAGINAL EXAMINATION
Early In Labour-
Early rupture of membranes Sagittal suture in right oblique diameter Post. Fontanelle in right posterior quadrant
and ant. Fontanellae in left anterior quadrant Both fontanelle easily palpated
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Late In Labour
Large caput present obscuring the sutures Pinna points occiput Perineum gapes much before head distends it
and premature straining can occur Difficulty in applying forceps in unrecognized
occipitoposterior
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MECHANISM OF LABOUR ENGANGING DIAMETER Suboccipitofrontal-10.5cm Occipitofrontal-11.5cm
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COURSE OF LABOUR
Anterior rotation- 90% cases, occiput rotates anteriorly through 3/8 of circle and baby born occipitoanterior.
Engagement may be delayed and labour may be longer because of deflexion.
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Posterior Rotation And Face To Pubis Delivery Head is deflexed. Engaging diameter is occipitofrontal. Sinciput rotates anteriorly then occiput rotates
posterioirly Extreme flexion followed by extreme extension Perineal tears common Liberal episiotomy needed Occipitosacral position and face to pelvis are
more common anthropoid pelvis
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Failure Of Rotation
Persistent occipitoposterior is the absence of rotation and head remains as ROP or LOP
Deep transverse arrest is defined as head being arrested with sagittal suture in transverse diameter at the level of ischial spine, after full dilation of cervix and inspite of good uterine contractions
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Reasons-
Deflexion of the head Inefficient uterine contraction Weak pelvic floor preventing anterior rotation Pendulous abdomen and poor muscle tone Cephalopelvic disproportion and android
pelvis
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MANAGEMENT
Most of the malpositions will rotate anteriorly and the baby will be born spontaneously as occiput anterior
Posterior rotation- labour longer- Judicious use of fluids, liberal
episiotomy and analgesia needed-partogram essential
- -oxytocin augmentation
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DEEP TRANSVERSE ARREST
1. Caesarean section-android pelvis, cephalopelvic disproportions, traumatic vaginal delivery causing intracranial haemorrhage
2. Vacuum extraction- ideal- cup at posterior fontanelle- promotes flexion, thus decreases presenting diameter- promotes autorotation suited for the pelvis- less traumatic, no need for analgesia
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3. Manual rotation- under GA
-right hand grasps the sinciput, displacing it and there by increasing flexion
- Small bitemporal diameter allows more space for the thumb and finger to have firm grasp across the temple with middle finger on the frontal suture
- In LOP, left hand used- sinciput rotated and forceps or vacuum used
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4. Forceps Rotation-- Keilland forceps used- Under GA- In anteroposterior direction and rotation
carried out- Adv- forceps need not be reapplied
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PERSISTENT OCCIPITOPOSTERIOR Oxytocin augmentation tried Most cases delivery as occipitoposterior
with face to pelvis, assisted with forceps or vacuum
Rotation to occipitoanterior can be attempted
Caesarean section otherwise
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If any of the attempt to deliver the baby vaginally fails.. Immediate CS should be done
Otherwise, fetus may die and craniotomy by experienced hands or CS must be done
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FACE PRESENTATION Cephalic presentation where the attitude is
one of complete extension, presenting part is face and denominator is the chin or mentum
Engaging diameter is submentobregmatic-9.4cm
Primary face presentation are present before onset of labour and are rare
Secondary caused by extension during labour and is most common
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POSITIONS
Left mentoanterior(LMA) Right mentoanterior(RMA) Right mentoposterior(RMP) Left mentoposterior(LMP) 70% are mentoanterior and 30% posterior.
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INCIDENCE AND AETIOLOGY Incidence- 1 in 500
Maternal Causes
- contracted pelvis
- obliquity of uterus
- multiparity or pendulous abdomen
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Fetal Factors
-anencephaly and iniencephaly
-cord around the neck
-tumours of neck like congenital goitre
-spasm of sternocleidomatoid muscle
-dolicocephalic head
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DIAGNOSIS ABDOMINAL EXAMINATION In mentoanterior, back is felt with difficulty as it
is posterior and limbs anteriorly Head remains high Cephalic prominence is the occiput and on the
same side as the back Groove b/w the head and back is prominent Fetal heart sounds are transmitted through the
chest and heard well anteriorly in mentoanterior
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VAGINAL EXAMINATION
-conical bag of membranes
- chin, mouth, nose, malar eminences and supraorbital ridges are felt
-in mentoanterior, chin is in one ant. Quadrant and forehead in opp post. Quadrant
-done gently and without cream to avoid injury to eyes
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MECHANISM OF LABOUR MENTOANTERIOR POSITION
1. Engagement
-engaging diameter- submentobregmatic-9.4cm
-biparietal diameter-7cm
This diameter pass only when face low down in perineum
-when face distending the vulva, head engaged
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2. DESCENT WITH INCREASING EXTENSION
-Resistance encountered by extension
-occiput pushed towards back of fetus, while chin descends
3. INTERNAL ROTATION
-Rotates anteriorly through 45°towards symphysis
Neck traverse the posterior surface of symphysis pubis
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4. FLEXION
-head born by flexion
-chin pivots under symphysis pubis and the mouth, nose, orbit, forehead ,vertex and occiput are born by flexion
5. RESTITUTION AND EXTERNAL ROTATION
-of chin occurs towards the side to which it was originally directed and the shoulder are born as in vertex
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MENTOPOSTERIOR
-2/3RD cases rotate anteriorly through 3/8th circle and deliver as mentoanterior
-some in oblique diameter and some rotate posteriorly into the hollow of sacrum
-neck too short to span in the 12cm of the ant. Aspect of sacrum
-shoulders get impacted along with head making delivery impossible
-engaging diameter is sternobregmatic-17cm
-no mechanism of labour
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CAUSES OF PROLONGED LABOUR
Face is less effective dilator of cervix No moulding of face More chance of rupture of membranes Long internal rotation in mentoposterior Internal rotation occurs only late in 2nd stage
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COMPLICATIONS
MATERNAL
Prolonged labour Increased risk of operative delivery Obstructed labour in persistent
mentoposterior
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FETAL
Face after delivery is oedematous Laryngeal oedema can also occur- baby
watched for 24 hrs Congenital malformations like anencephaly Birth asphyxia due to cord prolapse and
prolonged labour
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MANAGEMENT
Mentoanterior, forward rotation in mentoposterior- labour allowed
CPD, anencephaly, other anomalies, persistent mentoposterior, obstructed labour- CS DONE
Dead baby- CS or craniotomy
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BROW PRESENTATION
Most unfavourable Attitude is one of partial extension,
presenting part being the area between the ant. Fontanelle above and glabella and orbital ridges below and denominator is forehead or frontum
Presenting diameter is verticomental- 13.5cm
Transitory presentation- flex or extend
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INCIDENCE AND AETIOLOGY INCIDENCE-1 in 1000 CAUSE- similar to face presentation and
include any factors that interfers with flexion of head
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DIAGNOSIS
Rarely made before labour
ABDOMINAL EXAMINATION High mobile head, which feels large from
side to side Cephalic prominence is the occiput and is on
same side as back and groove between cephalic prominence and back is less prominent than in face presentation
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VAGINAL EXAMINATION
Membranes felt in early labour Anterior frontanelle is felt at one end and root
of nose and orbital ridges at other end of oblique or transverse diameter
Nose and mouth are palpable but not the chin
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MECHANISM OF LABOUR
Presenting diameter - verticomental No mech of labour for persistent brow
presentation Spontaneous labour only if baby very
small or pelvis large In persistent brow, verticomental dia is
shortened & the occipitofrontal dia elongated with marked moulding and large caput on forehead
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COMPLICATIONS
Both maternal and fetal risks are more
MATERNAL
Obstructed labour and rupture uterus
FETAL
Birth asphyxia
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MANAGEMENT ANTEPARTUM Wait till labour
EARLY LABOUR If membrane not ruptured wait for correction After membrane rupture, brow presentation
diagnosed and in persistent brow presentation –CS done
Prologed labour with head high.. Brow presentation must be suspected
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LATE LABOUR If features of obstructed labour or if fetus
dead- immediate CS done If baby dead- also craniotomy
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SHOULDER PRESENTATION AND TRANSVERE LIE
Long axes of fetal and maternal ovoid are approximately at right angles to each other and shoulder is presenting in the pelvic inlet.
Denominator- acromion
POSITIONS Right acromial Left acromial
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DEPENDING UPON DIRECTION OF THE BACK
Dorsoanterior Dorsoposterior Dorsosuperior Dorsoinferior
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INCIDENCE AND AETIOLOGY Incidence- 1 in 500 MATERNAL FACTOR Multiparity Contracted pelvis Uterine anomalies like septate,bicornuate
and arcuate uterus Placenta praevia Fibroid in the lower segment
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FETAL FACTORS
Prematurity Multiple pregnancy Polyhydraminos IUD
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DIAGNOSIS ABDOMINAL EXAMINATION Transversely stretched Fundal height less than period of gestation No Fetal pole at fundus Ballotable head in one flank & breech in the
other In dorsoanterior, back is felt a uniform
reistance acros the front of abdomen In dorsoposterior, limbs are felt anteriorly Empty pelvic grip
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VAGINAL EXAMINATION
Conical bag of membranes with a high presenting part
Hand/shoulder/elbow may be felt as a uniform resistance across the front of abdomen
Shoulder can be identified by ribs running parallel to each other
Late in labour, shoulder may be wedged in the pelvis and hand freequently prolapse into the vagina
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Thumb of the prolapsed hand, when supinated points to head
To side, to which the prolapsed hand belongs, can be determined by shaking hand with the fetus. If the right hand is required, prolapsed hand is the right and viceversa
ULTRASONOGRAPHY Confirms diagnosis and position Rules out anomalies Rules out placenta praevia
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MECHANISM OF LABOUR
NO mechanism of labour Spontaneous version to breech or by
spontaneous rectification to vertex can occur Rarely if fetus small or dead delivery occurs
by:- Spontaneous expulsion or birth corpora
conduplicata where fetus is expelled doubled up
- Spontaneous evolution where breech and trunk are expelled followed by head
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NEGLECTED SHOULDER PRESENTATION Due to ill fitting presenting part, membranes
may rupture early and freequently ensues cord prolapse, once labour commence
A labour pain becomes stronger, the shoulder forced into the pelvic inlet
Nullipara- uterine inertia Multipara-bandl ring or pathological retraction
ring-obstructed labour- neglected shoulder presentation
Mother-exhausted,febrile and urine show ketone bodies-uterine rupture- death of both mother and baby
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COMPLICATIONS
MATERNAL Increased chance of caesarean section Obstructed labour or ruptured uterus
FETAL Birth asphyxia due to cord prolapse and
in obstructed labour
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MANAGEMENT
EXTERNAL CEPHALIC VERION At term or early in labour if membranes
intact and not contraindicated More successful in multipara If successful followed by stabilizing
induction More success than for breech
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CAESAREAN SECTION Best option When ECV fails and CI Transverse inscision
NEGLECTED SHOULDER PRESENTATION If baby dead-CS or craniotomy
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Reference
Shiela B, Text book of Obstetrics.