Abnormalities of presentation position and lie€¦ · Abnormalities of presentation position and...
Transcript of Abnormalities of presentation position and lie€¦ · Abnormalities of presentation position and...
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Abnormalities of presentation position and lie
Dr Ismaiel Abu Mahfouz
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Outline Malpresentation
• Breech
• Face presentation
• Brow presentation
• Shoulder / Compound / Cord
Malposition
• Occipitoposterior
Abnormal lies
• Unstable / transverse
• Oblique lies
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Definitions
• Presentation : the part of the fetus that is lowermost in the pelvis
• Malpresentation: any presentation other than vertex
• Position: the relationship of the part of the fetus that presents in the pelvis to the four quadrants of the maternal pelvis
• Malpositions:
o Abnormal positions of vertex relative to maternal pelvis
o Any position other than occcipto-anterior
• Lie: the relationship between the longitudinal axis of the fetus and the longitudinal axis of the mother
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Abnormalities of presentation position and lie
• Associations
Maternal morbidity o Anaesthetic risks
o Surgical risks “Obstructed labour”
Fetal morbidity o Intrapartum : hypoxia (prolonged labour or cord prolapse)
o Morbidity related to CS
o Morbidity related to instrumental vaginal deliveries
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Malpresentations
• Breech
• Face
• Brow
• Cord presentation and prolapse
• Shoulder / Compound
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Breech Incidence
28 % at 20 weeks, 15 % at 28 weeks, 3 % at term
Associations
o Uterine anomalies (bicornuate uterus......)
o Pelvic abnormality / masses (cervical fibroid, ovarian cyst)
o Intrauterine growth restriction
o Fetal CNS anomalies (hydrocephalus)
o Aneuploidy/trisomy (? Polyhydramnios)
o Prematurity
o Placenta praevia
o Previous breech presentation at term
o Multiple pregnancy
o Oligohydramnios or polyhydramnios
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Types of breech
Frank Breech (65%)
Footling Breech (25%)
Complete Breech (10%)
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Frank Breech (65%)
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Footling Breech (25%)
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Complete Breech (10%)
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Breech: Antenatal management External cephalic version (ECV)
• Reduces incidence of non-cephalic presentation at delivery
• Reduces incidence of CS rate
• Recommended to all women with an uncomplicated breech
presentation from 36 weeks
• Should not be offered routinely before term, as it has not been
shown to improve outcomes if performed before term
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ECV
• Success rates 40 - 80 %
• Following successful ECV, 97% remain cephalic
Factors that may increase the likelihood of success
o Multiparity
o Adequate liquor volume
o Breech above the pelvic brim
o Fetal head easy to feel
o Placenta not anterior
o ? Low BMI
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ECV: contraindications
Relative • Previous lower segment CS
• Maternal disease (hypertension, diabetes)
• IUGR or oligohydramnios
• Maternal high BMI
Absolute • Multiple pregnancy
• Antepartum haemorrhage (within the last 7 days)
• CS indicated for other reasons
• Ruptured membranes
• Fetal abnormality
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ECV: Complications
• Pre-term labour
• Abruptio Placentae
• Cord accident (FHR Bradycardia up to 8%)
• Uterine rupture
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ECV: the aftercare
• Rate of CS may be higher than average for babies successfully turned when compared to ‘genuine’ cephalic presentations
• Non cephalic-presenting fetuses are more likely to display
signs of fetal compromise
• Should be regarded as a high-risk group
• Rh alloimmunisation prophylaxis
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Breech: Mode of delivery at term
Planned c section (Term Breech Trial)
• Reduces: perinatal or neonatal morbidity and death
• Reduces combined complications
Recommendation
• ? Elective c section for breech at term for PG
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Breech delivery Preterm
• Controversial
• RCOG guidelines do not advise routine CS
• The Term Breech Trial findings cannot be extrapolated to preterm breech delivery
• Decisions should be individualised
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First twin breech
• Theoretical risk of interlocked twins (1/817)
• Recommend elective CS
Second twin breech
• RCOG does not recommend elective CS
• Second twin’s position may change following delivery of the first in 20 % of cases
Breech delivery Twin breech
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Head related abnormal presentations Face
Brow
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Head attitude
Brow
Mentovertical
Face
Submentobregmatic
Deflexed
Occipitofrontal
Flexed
Suboccipito
bregmatic
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Face presentation
Incidence and aetiology
1/500
Associated with
• Prematurity
• Fetal goitre
• Uterine anomalies
• Polyhydramnios
• Placenta praevia
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Face: clinical finding
• Diagnosis usually made in labour by vaginal examination
• Landmarks: mandible, mouth, nose and orbital ridges
• Avoid damage to the eyes on examination
• Facial oedema: distinction between face and breech ? difficult
• Ultrasound: if there is any doubt
• Delay in the first or second stage of labour may occur
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Face: management
• Ultrasound: exclude fetal or pelvic abnormalities
• Vaginal delivery: possible with the mento-anterior position
• In the second stage :
o Mento-anterior : head may deliver by flexion
o Mento-posterior: may rotate during the second stage
• Fetal risks: facial soft tissue trauma, causes feeding difficulties
• Maternal risks: perineal injury, sphincter damage, CS
• Augmentation: not advised
• Lack of progress : prompt delivery by CS
• Vacuum delivery: contra-indicated
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Why mentoposterior does not deliver vaginally?
• In vertex: delivery of fetal head occurs by extension
• In face : head is already in maximum extension
• In mentoposterior; the head, neck and shoulders enter the pelvis at the same time
• The length of the sacrum is 10 cm
• The length of neck is 5 cm
• The shoulders get impacted
• Labour is obstructed
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Brow presentation
Incidence and aetiology
• 1/1000 deliveries
• Due to a deflexed head
• Associated with
o Prematurity
o Fetal neck tumours
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Brow: Clinical findings
• In labour: failure to progress in first or second stage
• Vaginal examination: forehead is the leading part
• The anteroposterior diameter of the head is ‘mento-vertical’: about 13.5 cm at term
• The average anteroposterior and lateral diameters of the female mid-pelvis are 12 × 12 cm
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Brow: management
Diagnosis in the early first stage:
• Expectant management for a short time (2–3 hours)
• May flex into a vertex or extend to face
Diagnosis often made in late first or second stage:
• Caesarean delivery is advised
Augmentation with syntocinon: not advised “uterine Rupture”
Mento-vertical dimensions may be smaller in a preterm fetus, allowing
vaginal delivery
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Cord presentation and prolapse Incidence and aetiology
• Cord presentation/cord prolapse : 0.1–0.6 % of all births
• Cord presentation:
Cord below presenting part, with the membranes intact
• Cord prolapse:
Cord descending through the cervix into the vagina with ruptured membranes
• May follow fetal scalp electrode placement, stabilizing induction of labour, external cephalic version or internal podalic version
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Clinical findings
• Presence of a ‘high’ presenting part in early labour
• Ultrasound: the presence of a cord presentation
• In advanced labour, the findings are self-explanatory
• The cord may be felt pulsating
• Abnormal cardiotocography, should raise the possibility
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Management
Cord prolapse • An emergency delivery
• Fetal hypoxia:
o Pressure from the presenting part
o Arterial spasm
• The presenting part should be elevated (various methods)
• The cord should be replaced in the vaginal with minimal handling
• In the presence of viable fetus: Immediate delivery
Cord presentation • May be seen by USS in preterm fetuses: No intervention
• Usually diagnosed in labour by VE
• If in labour: CS
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Shoulder / compound presentation
Compound presentation:
• More than one fetal part presenting
Shoulder presentation
• Shoulder is presenting
Both
• Associated with prematurity
• Complicate unstable , ‘high’ head or breech
Delivery:
• Shoulder : CS if in labour
• Compound: depends on the combination
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Shoulder presentation
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Malpositions “Occipito-Posterior” (OP)
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OP Prevalence
• 15 to 32% at the onset of labour • 10 to 20% early in the second stage • 5 to 8% at delivery
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OP: Consequences in Labour • Membranes rupture early
• The forces push the head posteriorly: backache and
urge to push before full dilatation
• The occipito-frontal diameter reaches 10 cm; passage
through the pelvis may be more difficult
• The 1st and 2nd stages of labour may be prolonged
• May rotate to OA or persists
• If persistent OP in labour:
o May deliver spontaneously:
o If not: consider assisted delivery
Rotation to OA by: Ventouse, Kielland Forceps or manual
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Abnormal lie
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Unstable/ transverse/ Oblique lies Incidence and aetiology
• 1/320
Association
o Multiparity
o Polyhydramnios
o Placenta praevia
o Pelvic tumour
o Uterine anomaly
o Contracted maternal pelvis
o Hydrocephalus and fetal neck tumours
o Fetal neuromuscular dysfunction “reduced FM”
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Abnormal lies / Clinical findings
The absence of a fetal pole in the pelvis on
abdominal or vaginal examination
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Abnormal lie: management
Ultrasound scan • Confirm findings
• Look for fetal-anomaly
• Measure liquor volume
• Check placental site
• Pelvic tumours or uterine anomalies may be difficult
to identify in late pregnancy
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Abnormal lie: management
• In the majority of cases: spontaneous version to longitudinal lie
will occur prior to membrane rupture or labour onset
• Inpatient management : from 37 weeks “ risk of cord prolapse”
o Conservative Mx: Lie stabilised longitudinally for 48 H
o Active Mx: ECV
• ECV for unstable lie should only be done with immediate induction ‘stabilizing induction”
• Stabilizing induction requires a favourable cervix
• Should the patient present in early labour, ECV can be attempted
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Caesarean section: • Should be planned at the appropriate gestational age ? 38 weeks
Risk of cord prolapse in the event of contractions or
rupture of membranes
Abnormal lies: management
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Summary
Abnormal presentation / position / lie
Associated with maternal/ fetal morbidity and mortality
• In labour, suspicions raised in the presence of delayed progress
• Ultrasound: may help in Dx & Mx
• Senior obstetrician should be involved in Mx
• Regular ‘skills drills’ to keep trained
• Many malpresentations require CS which can be difficult
• ECV offered for breech presentation from 36-37 weeks