Caesarean section Flashcards

1
Q

Indications in modern obstetrics-Classical Caesarean section

A

Upper segment of uterus in incised vertically

  • Extreme prematurity
  • Multiple fibroids
  • Transverse lie
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2
Q

Advantages of Transverse incisions C Section

A
  • Cosmetic
  • Less painful
  • Less interference with postoperative respirations
  • Greater strength
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3
Q

Disadvantages of Transverse incisions C Section

A
  • More time consuming/more blood loss
  • less access to upper abdominal cavity
  • Potential haematoma
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4
Q

What is Pfannenstiel incision-?

A
  • Introduced by Pfannenstiel in 1900
  • curved incision is approximately 10–15 cm long and 2 cm above the pubic symphysis.
  • The skin and rectus sheath are opened transversely using sharp dissection.
  • The rectus muscles are not cut and the fascia is dissected along the rectus muscles.
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5
Q

What is Joel-Cohen incision?

A

used for caesarean section
•straight transverse incision through the skin, 3 cm below the level of the anterior superior iliac spines (higher than the Pfannenstiel incision
•subcutaneous tissues and fascia are opened in the midline and extended laterally with blunt finger dissection.
• Blunt dissection is used to separate the rectus muscles vertically and then open the peritoneum.

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6
Q

Advantages of vertical incisions C Section

A
  • Excellent exposure
  • Easily extendable
  • Minimum nerve damage
  • Median incision has less blood loss
  • Rapid entry into abdomen
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7
Q

Disadvantages of vertical incisions C Section

A
  • Wound dehiscence and hernia more frequent
  • Poor cosmetic results
  • High infection/bleeding with paramedian incision
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8
Q

Outline steps of C section Technique

A
  • Abdomen is opened by Joel-Cohen incision
  • Uterus is opened by transverse incision in lower segment
  • Deliver the baby and placenta
  • Uterus is closed with vicryl in 2 layers
  • Peritoneum is not closed
  • Rectus sheath closed with continuous vicryl
  • Skin closed with either non absorbable or absorbable sutures example- Prolene/staples/Monocryl
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9
Q

Absorbable sutures

A
  • Catgut
  • Polyglactin (Vicryl)
  • Vicryl rapide
  • PDS (Polydiaxone)
  • Monocryl
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10
Q

Non-Absorbable sutures

A
  • Silk
  • Nylon
  • Prolene
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11
Q

Indications for LSCS

A
  • Prolonged first stage of labour
  • Prolonged second stage and criteria for instrumental delivery are not met ( cephalo pelvic disproportion/malpositions)
  • Fetal distress- CTG abnormalities and abnormal fetal blood sampling
  • Abruptio placenta
  • Cord proplase
  • Suspected Scar dehiscence
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12
Q

Indications for Elective caesarean section

A
Performed at 39weeks
•Placenta previa
•Severe antenatal fetal compromise
•Abnormal lie- breech
•Previous classical caesarean section
•Gross pelvic deformity

Relative indications-
•Severe IUGR
•Twin pregnancy
•Previous caesarean section

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13
Q

NICE guidance on Maternal request caesarean section

A
  • When a woman requests a CS because she has anxiety about childbirth, offer referral to a healthcare professional with expertise in providing perinatal mental health support to help her address her anxiety in a supportive manner. [NICE, 2011]
  • For women requesting a CS, if after discussion and offer of support (including perinatal mental health support for women with anxiety about childbirth), a vaginal birth is still not an acceptable option, offer a planned CS. [NICE, 2011]
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14
Q

How do we classify urgency of C sections

A

Emergency: Immediate threat to mother or fetus-fetal distress

Urgent: Maternal or fetal compromise not immediately life threatening- dystocia

Scheduled: Needing early delivery but no compromise

Elective: At time suiting mother or team

Peri/postmortem: For mother during maternal cardiac arrest /fetus after maternal death

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15
Q

Maternal Complications of LSCS

A

More when emergency than elective

Serious risks-
•emergency hysterectomy
•need for further surgery at a later date
•admission to intensive care unit 
•thromboembolic disease
•bladder injury
•ureteric injury
•death

Frequent risks
•persistent wound and abdominal discomfort
•increased risk of repeat caesarean section when vaginal delivery attempted in subsequent pregnancies
•readmission to hospital
•haemorrhage
•infection

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16
Q

Counsel on Future pregnancies after LSCS

A
  • increased risk of uterine rupture during subsequent pregnancies/deliveries
  • increased risk of antepartum stillbirth
  • increased risk in subsequent pregnancies of placenta praevia and placenta accreta
17
Q

Placenta accreta

A

an abnormal adherence of either in whole or part of the placenta to the under lying uterine wall

18
Q

Placenta increta

A

placenta invades deeply into myometrium

19
Q

Placenta percreta:

A

Penetration to uterine serosa, may invade bladder and adjacent structures

20
Q

Pre-operative preparation for LSCS

A
  • Indication
  • History- previous surgeries/previous problems at operations like wound infection
  • History of DVT and risk access for VTE and plan for appropriate prophylaxis
  • Medical disorders/mediation used / if on fragmin stop 24 hrs before LSCS
  • BMI – increased risks of operation for high BMI >30
  • Previous PPH
  • Check haemoglobin/blood group and save sample
  • Obtain valid consent / TED stockings/anaesthetic review
  • Check placental site on scan
  • Check for presentation if LSCS for breech
21
Q

Define Breech presentation

A
  • Presentation refers to the part of fetus that occupies lower uterine segment.
  • Presentation of the buttocks is breech presentation • 3-4% pregnancies at term
  • 25% around 30weeks
22
Q

Aetiology of breech presentation

A
  • No cause
  • Previous breech in 8%
  • Prematurity
  • Fetal/uterine abnormalities • Twin pregnancies
  • Placenta previa
  • Pelvic tumours
  • Pelvic deformities
23
Q

How is breech presentation diagnosed?

A
• Important after 37 weeks
• Hard head at fundus / ballotable
Ultrasound- confirms the diagnosis
• Also to rule out placenta previa/tumours • Type of breech
• Estimated weight
• Liquor volume
24
Q

Types of breech

A
• Extended breech ( frank breech)- • Flexed at hips
• Extended at knees
Complete (flexed breech )
• Babies knees and hips are flexed
Footling breech
• Babies feet are presenting
25
Q

Complications of breech presentation

A
  • Perinatal mortality and morbidity are increased • Fetal abnormalities are more common
  • Labour- hypoxia/birth trauma
  • High rates of long term neurological handicap
26
Q

Explain External cephalic version

A
• From 37 weeks
• Can attempt to turn the baby to cephalic • Success rate 50%
• 3% will turn back
Technique-
• With out anaesthetic
• Labour ward
• With uterine relaxant
• Ultrasound guidance
• Breech is disengaged and moved up
• Forward somersault movement
• CTG is performed straight after
• Injection Anti D if given if rhesus negative
27
Q

Complications of External cephalic version

A

Complications-
• Placental abruption
• Uterine rupture
• Urgent LSCS may be needed in 0.5%

28
Q

ECV Factors affecting success rate-

A
  • Nulliparous
  • Breech engaged
  • Obesity
  • Liquor reduced
  • Big baby
29
Q

Contraindications to ECV

A
  • Fetal distress
  • Placenta previa
  • Twins
  • Recent bleeding
  • Membranes have ruptured • Uterine/fetal anomalies
  • One pre LSCS is not an contraindication
30
Q

Mode of delivery for breech

A

• If ECV fails – elective caesarean section at 39 weeks
Caesarean section-
• Reduces perinatal mortality
• Birth trauma
• Neonatal admission
• Low Apgar scores
• Some women may prefer vaginal breech delivery / second twin may be breech

31
Q

Vaginal breech delivery protocol

A

• Risky if fetal weight >3.8kg • Extended head
• Footling breech
• Fetal distress
Pushing is discouraged until buttocks are visible Good analgesia like epidural

• Once back of the neck is visible,
• Entire baby rests on the arm with finger in the mouth to
promote flexion
• The other hand presses on the occiput- to promote flexion
• This is called- Mauriceau-Smellie-Veit manoeuvre
• If this fails- apply forceps
• Deliver in all fours