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Presentation is ……the part of the fetus which occupying the lower uterine segment
Presentation
Presentation may be :
Breech 3 - 4% at term
Shoulder 1:200
Cephalic 95%
Oblique lie 1:200
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Vertex 99%Face 1:500Brow 1:1500
When the head is present in the lower uterine segment “Cephalic” the presentation may be :
During the antenatal period It is difficult clinically to diagnose that the presentation is vertex, brow or face so it is used to say cephalic presentation
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Vertex 99% Face 1:500
Brow 1:1500
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Vertex presentation:
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Vertex presentation
Is the commonest Presentation ( 99% of the cephalic presentations )
Lambdoid suture and posterior fontanelParietal eminenceCoronal suture and anterior fontanel
The Vertex is the area between
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Transverse Diameters
longitudinal diameters
Vertex has
biparietal diameter 9.5 cm
Bitemporal diameter 8.5 cm
Bimastoid diameter 8 cm
Subparietal subraprietal 9 cm
Sub - occipito bregmatic 9.5 cm
Sub-occipito frontal 10.5cm
Occipito frontal 11.5cm
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During the fetal life the fetus can take the suitable comfortable position
The position …….is the relation shape of the denominator of the presenting part to the pelvic brim
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Right or left Anterior Transfers Posterior
The position of the presenting part can be
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Direct occipito anterior (OA …. 3 %)Direct occipito posterior (OP …..2 %)
Right occipito anterior (ROA …7 %)Left occipito anterior (LOA …7 %)
Right occipito transverse (ROT …35%)Left occipito transverse (LOT …40%)
Right occipito posterior (ROP …3 %)Left occipito posterior (LOP …3 %)
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When the head presented as vertex anteriorIt is fully flexed “ the chin near to the chest”
Transverse Diameter the biparietal diameter 9.5 cm
Longitudinal Diameterthe Sub - occipito bregmatic 9.5 cm
Most of Vertex anterior presented by
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vertex anterior
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Occipito anterior
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Right occiputo anterior (ROA).
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Stages of normal labor
1st stage
2nd stage
3rd stage
4th stage
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Management of Normal Labor
Observation:Partogram:
Visual representation of events during labor against time.
♦ Maternal Vital Signs records ♦ Cervical dilatation. ♦ Station of presenting part, moulding & caput formation. ♦ FHR Monitoring ♦ Advice and medications
1st stage
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management in labour ▪ proper clinical assessment ▪ review antenatal chart ▪ insert large pore I.V. line ▪ take the necessary investigation ▪ keep patient fasting during labour ▪ start I. V. fluids to prevent maternal dehydration and ketosis ▪ use Partogram for labour progress assessment ▪ continuous fetal monitoring ▪ provide adequate analgesia ▪ regular observation of maternal and fetal condition and the labour progress ▪ be ready for operative intervention either vaginally or abdominally and inform the neonatologist anesthesia and operation theater staff
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MECHANISM OF LABOUR
Decent of the presenting part
Flexion
Lever action producing flexion of the head; conversion from occipitofrontal to suboccipitobregmatic diameter typically reduces the anteroposterior diameter from nearly 12- to 9.5 cm.
2nd stage
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Engagement
The greatest transverse diameter “BPD” passes through the pelvic inletIt may occur in the last few weeks of pregnancy or only during labour especially in multiparaThe fetus enters the pelvis in transverse or oblique diameter
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Asynclitism
The sagittal sutures of the head deflects ant towards the symphysis pubis or post towards the sacrum
SynclitismThe sagittal sutures of the head present med way between the symphysis and sacral promontory
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Anterior asynclitism Naegele's obliquity
synclitism
Posterior asynclitism Litzmann's obliquity Ear presentation
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Further Decent
In multipara descent begins with engagement It is gradually progressive till the fetus is delivered
In nulipara further descent may not occur till the 2nd stage of labor
It is affected by ♦the uterine contractions + ♦effacement and progressive dilatation of the cervix
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The descending head “occipot” reach the pelvic floor muscles at the level of the ischial spines “ie the midcavity”.the pelvic floor muscles prevent the head to go backward + downward any further and because of the revolving position of the pelvic floor muscles “The levator ani muscles form a V shaped sling”. the head has to change its direction forward + downward internal rotation
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Internal Rotation
Turning of the head from the OT position anteriorly towards the symphysis pubis ie. Occipot moves from transverse to anterior “45º”
Less commonly OT posteriorly towards the sacrum
Extension
When the occiput comes direct below the inferior margin of the symphysis pubis ie the flexed head reaches the vulva it undergoes extension.
the fetal head is encircled by the vulvar ring Crowning
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The head is born by further extension ♦ Occiput, ♦ Bregma, ♦ Forehead, ♦ Nose, ♦ Mouth & chin pass successively over the perineum
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Restitution
After delivery of the head it returns to the position it occupied at engagement , the natural position relative to the shoulders (oblique position) Restitution
External Rotation
♦ Then the fetal body will rotate to bring one shoulder anterior behind the symphysis pubis (biacromial diameter into the APD of the pelvic outlet)♦ The ant shoulder slips under the pubis ♦ By lateral flexion of the fetal body the post shoulder will be delivered & the rest of the body will follow
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Abnormalities of Labor-1
• Prolonged latent phase:– Definition:
• > 20 hours in primipara.• > 14 hours in multipara.
– Treatment:• Maternal sedation.• Oxytocin stimulation.
– Outcome:• 85% progress into the active phase.• 5% wake up without contractions.
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Abnormalities of Labor-2
• Protracted active phase:– Dilatation < 1.2 cm/h in primipara.– Dilatation < 1.5 cm/h in multipara.
• Arrest of active phase:– Cessation of previously normal dilatation after
uterine contractions of 200 montevideo units has been present for ≥ 2 hours.
– Causes: CPD or malpresentation.– Management: augmentation or CS.
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Abnormalities of Labor-3
• Protraction of descent:– Descent < 1 cm/h in primipara.– Descent < 2 cm/h in multipara.
• Arrest of descent:– No descent for 2 hours.
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Occipito Posterior Position
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When the head is presented with vertex posterior “OP” it will be deflexed and the longitudinal diameters will be will change to:
Sub-occipito frontal 10.5cmOr
Occipito frontal 11.5cm
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Diagnosis
Antenatal
Occipito Posterior Position OP
Diagnosed is important at least to rule out any major causes which may be a contraindication to leave the patient inter into labour
Suspension during antenatal examinations raise when:
○ High head ○ Large amount of head is palpable ○ fetal back is placed posterior○ the sencipot is lower than the occipot
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vaginal examination during labour :
○ High presenting part
○ Anterior fontanel felt near to the symphysis
○ Posterior fontanel felt near to the sacral promontory
○ Frontal sutures and Frontal bones
○ Orbital ridge and Nose
Diagnosis During Labour
Occipito Posterior Position OP
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Occipito Posterior Position OP
Possible Etiological causes
PGHigh assimilation angleBicornate uterusSeptet uterusFibroid uterusPelvic tumor Non gynaecoid pelvisPost traumatic contracted pelvis “RTA”Post Poliomyelitis ..
Maternal
PrematurityMultiple gestationPolyhydramniosOligohydramniosLarge FetusLarge Fetal headCongenital AbnormalitiesCord around the neckNeck tumer
Fetal
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Occipito Posterior Position OP
Complication
Maternal Fetal
Rupture of fetal membranes
marked moulding
cord prolapse → fetal distress
→fetal death
prolonged and complicated labour
Maternal distress … dehydration …
keto acidosis
Infection
obstructed labour → uterine rupture →
→ ( APH ) → ( PPH ) →maternal death
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management
Diagnosed before labour
○ Exclude any major cause lead to OP
○ Plan the further managements
Explanation and Advice
Type of delivery
When ?
Arrange the necessary investigation
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○ Mechanism of labour in OP
○ 75 % of the vertex rotate from the posterior position to anterior position and deliver as Occipito anterior
○ 5 % of the vertex continue labour in Posterior position and deliver as Face to Pubis
○ 20% will end as deep transfers arrest and need to be delivered by vacuum rotation by rotational forceps by Cesarean Section
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,.
,0
Mechanism of labor for right occiputo posterior position, anterior rotation.
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○ Mechanism of labour in OP
Life saving skills – home by whom
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Occipito transverse
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brow presentation
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brow presentationIn Brow Presentation the head is Deflexed the longitudinal Diameter will be mento - vertical 13cm
most of cases of brow presentation diagnosed in labour
in early labour minor deflection attitude are common when the uterus contract the head will either :
more flexion attitude → vertex
Head stay med way between extension and
flexion attitude ( deflexed attitude ) → brow
full extension → face
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Brow Presentation
Possible Etiological causes
PGHigh assimilation angleBicornate uterusSeptet uterusFibroid uterusPelvic tumor Non gynaecoid pelvisPost traumatic contracted pelvis “RTA”Post Poliomyelitis ..
Maternal
PrematurityMultiple gestationPolyhydramniosOligohydramniosLarge FetusLarge Fetal headCongenital AbnormalitiesCord around the neckNeck tumor
Fetal
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DiagnosisMajority of cases are secondary , primary cases will occasionally be diagnosed during antenatal follow up
Suspension during antenatal examinations raise when:
○ High head ○ Large amount of head palpable on the same side of the back○ Deep depression between the back and the head
vaginal examination in early labour :
High presenting part
Anterior fontanel
Frontal sutures and Frontal bones
Orbital ridge and Nose
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complication
Rupture of fetal membranes
cord prolapse → fetal distress →fetal death
marked molding
Increase in maternal and fetal morbidity and mortality
Rupture of fetal membranes
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
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management of brow presentation
Brow presentation is not suitable for vaginal delivery
because of the large longitudinal diameter
If brow presentation diagnosed in early labour with no maternal
of fetal compromise we may wait and review the condition after
2 hours if still brow … emergency cesarean section
If brow presentation diagnosed in established labour with signs
of obstructed labour ……. emergency cesarean section
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Face presentation
full extension of head over the neck
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Face Presentation
Possible Etiological causes
PGHigh assimilation angleBicornate uterusSeptet uterusFibroid uterusPelvic tumor Non gynaecoid pelvisPost traumatic contracted pelvis “RTA”Post Poliomyelitis ..
Maternal
anancephallyPrematurityMultiple gestationPolyhydramniosOligohydramniosLarge FetusLarge Fetal headCongenital AbnormalitiesCord around the neckNeck tumor
Fetal
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Longitudinal lie. Face presentation. Left and right anterior and ri posterior positions.
Rt mento-postRt mento-antLt mento-ant
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Diagnosis
Majority of cases are secondary ,primary cases will occasionally be diagnosed during antenatal follow up
Suspension during antenatal examinations raise when:
○ High head occiput higher than senciput ○ Large amount of head palpable on the same side of the back○ Deep depression between the back and the head…’S’ shape of the fetal spin
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In face presentation we should recognize:
○ the orbital ridges
○ the eyes
○ the nose
○ the mouth
vaginal examination in early labour :
when the cervix is sufficiently dilated
vaginal examination is helpful
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complication
Rupture of fetal membranes
cord prolapse → fetal distress →fetal death
edema of the brow
marked moulding
Increase in maternal and fetal morbidity and mortality
Rupture of fetal membranes
prolonged and complicated labour
Maternal distress … dehydration … keto acidosis
Infection
No engagement of presenting part
obstructed labour → uterine rupture →
→ ( APH ) → ( PPH ) →maternal death
Maternal complication
Fetal complication
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management
If the presentation diagnosed before labour
Mento-anterior position … can deliver virginally
Exclude pelvic contraction
Estimate fetal size
Exclude fetal abnormalities
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management in labour ▪ proper clinical assessment ▪ review antenatal chart ▪ insert large pore I.V. line ▪ take the necessary investigation ▪ keep patient fasting during labour ▪ start I. V. fluids to prevent maternal dehydration and ketosis ▪ use Partogram for labour progress assessment ▪ continuous fetal monitoring ▪ provide adequate analgesia ▪ regular observation of maternal and fetal condition and the labour progress ▪ be ready for operative intervention either vaginally or abdominally and inform the neonatologest anesthesia and operation theater staff
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Mechanism of labour
Mechanism of labour in mento- anterior position
As labour progress
Increase extension … with mentum ‘ chin ‘ leads
Descent
Engagement in the transverse diameter of the brim
Further Descent
Rotation anteriorly to bring the mentum towards the symphysis pubis
Further Descent …mentum will escapes under the pubis
Flexion of the face allows the birth of the head
Delivery of the shoulders …. Delivery of the body … placenta
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mento- posterior position If the chin rotates posterior
and presentation becomes
mento- posteriorly position
vaginal delivery is not
visible … emergency C S
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Mechanism of labour in mento- posterior position
As labour progress
Increase extension … with senciput leads
Descent …..
Engagement in the transverse diameter of the brim
Further Descent … the mentum is carried to the hallow of the sacrum
Descent continues ..the occiput crushes into the shoulder the occipital bone is behind the pubis.
No further Descent …obstructed labour
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Breech presentation
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Breech presentation
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Breech presentation
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Breech presentation
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The nearest part of the fetus to the pelvic brim is the buttocks and lower limbs
Breech presentation
The denominator in case of breech is the sacrum
Incidence :
Depends on the gestational age of the fetus :-
-Before term between 28 –36 weeks 10-15 %
-After 37 completed weeks 3%
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types:
Complete breech (flexed breech)
Incomplete breech (extended breech)
all joints are flexed the feet presents beside the buttocks.
extended knee joints with flexion of the hip …..frank breech.
extended knee and hip joints …footling breech.
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Etiology
Prematurity
fetal abnormality
multiple pregnancy
Polyhydramnios
Oligohydramnios
placenta praevia
uterine abnormality
pelvic masses
multiparty
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Complication of breech
Maternal complication:
Increased maternal mortality and morbidity
Discomfort and sub costal pain
Dyspepsia
Prolonged labor
M. Distress
Increased manipulation and m. trauma
Puerperal sepsis
High incidence of C/S rate
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Fetal complication:
Complication of breech
Increased fetal mortality and morbidity
Prematurity
S.R.O.M
Cord prolapse
Entrapment of the fetal head
Asphyxia
intra ventricular hemorrhage
Fetal trauma
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Diagnosis
Symptoms:
Pain under the ribs
Discomfort
Indigestion
Hard mass at the hypochondrium
Fetal movements in the lower abdomen
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Ultrasound scan
P.V. examination … clinical pelvemetry
Examination:
External cephalic version
Complication
Contraindication
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Management
Ante natal :
Insure fetal wellbeing
Search for causes of breech presentation
Possibility of change to cephalic ECV
Mode of delivery
External cephalic version
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Breech allowed to deliver vaginally
No other indication for C S
No other complication medical or obstetrical with breech
Estimated Fetal size between 2.5 - 3.5 kg
Adequate pelvis
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iv fluidskeep fastinggive anti acidPartogram continuous fetal monitoringanalgesiainform neonatologest keep theater staff and the anesthetist informed
In labor
1st stage of labor :
proper history review of the A.N C. recordsinvestigation
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Spontaneous breech delivery
2nd stage of labor :
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Assisted breech delivery
LOVSET’S maneuver
2nd stage of labor :
delivery of the shoulders
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Forceps for the after coming head
MAURICEAU – SMELLIE – VEIT maneuver
2nd stage of labor :
Delivery of the head
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Forceps for the after coming head
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TRANSVERSE LIE “Shoulder Presentation”
The longitudinal axis of the fetus lie perpendicular to the longitudinal axis of
the mother
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CAUSES
Placenta Previa
Pelvic or uterine mass
Multiparty “pendulous abdomen”
Prematurity
Oligohydramnious
Polyhydramnious
Uterine abnormalities
Fetal abnormalities
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COMPLICATION
Increased Fetal complication
Cord prolapse
Fetal trauma
Fetal death
Increased Maternal complication
Obstructed labor
Rupture uterus
Operative intervention
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MANAGEMENT
Management of transverse lie depend on the gestational age and the possible cause
- Hospital admission and day by day follow up
- Proper clinical assessment history , examination , investigation consent
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- Search for the cause if any --- treat according to the cause
- Caesarian section if labor start or at term with persistent T.L.
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UNSTABLE LIE
An unstable lie is the lie which constantly change from one lie to another
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Unstable lie is associated with
Placenta Previa Pelvic or uterine massMulitiparity Prematurity PolyhydramniousFetal abnormalities
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Complication & managements
Same as transverse lie
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CORD PRESENTATION AND CORD ROLAPSE
When the umbilical cord lies alongside or in front of the presenting part while the fetal membranes are intact is known as cord presentation
If the fetal membranes rupture and the cord is felt it is called cord prolapse
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Predisposing factors
Malposition
Malpresenation
Cephalopelvic disproportion
Polyhydramnious
Prematurity
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Complication
Fetal distress
Fetal anoxia
Fetal death
Emergency operative intervention
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Cord prolapse is an obstetric emergency and delivery must be as quick as possible
MANAGEMENT
C/S is necessarily except if :
◒The cervix is fully dilated and the presenting part is engaged forceps or vacuum can be performed by experienced obstetrician.
◒ Death fetus with no other indication for C/S allow vaginal delivery.
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As soon as the diagnoses is made the cord should be handled as little as possible to avoid arterial spasm
Pressure on the cord can be reduced by displacing the presenting part by hand in the vagina or
by placing the patient in the knee-chest position
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Syntocinon should be stopped if it was used
Patient should be transferred to the operating theater for emergency C/S
Investigation should be sent urgently
The pediatrician should be informed to attend the delivery
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