What do systematic reviews say?

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in postpartum haemorrhage (blood loss at least 1000 mL;immediately post… compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 1.97 [0.48, 8.13]
  1 study · 447 participants
  Low

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in need for blood transfusion (within 24 hours post caesarean section) compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 3.54 [0.37, 33.79]
  2 studies · 847 participants
  Low

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in drop from baseline haemoglobin > 0.5 g/dL compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 0.92 [0.64, 1.31]
  2 studies · 722 participants
  Low

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in secondary postpartum haemorrhage (within 6 weeks postpartum) compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 1.18 [0.07, 18.76]
  1 study · 447 participants
  Low

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in febrile morbidity (at least 38° Celsius, measured on 2/10 days… compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 1.18 [0.76, 1.85]
  7 studies · 2126 participants
  Low

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in endometritis compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 0.94 [0.35, 2.52]
  4 studies · 1536 participants
  Low

Cervical dilatation vs no dilatation

Cervical dilatation showed no clear difference in uterine subinvolution compared with no dilatation (low certainty).

• Mechanical dilatation of the cervix during elective caesarean section before the onset of labour for reducing… 2018 · Cochrane Headline outcomes only
  RR 0.34 [0.08, 1.36]
  2 studies · 654 participants
  Low

Antispasmodics vs control

• Antispasmodics for labour 2013 · Cochrane Headline outcomes only
  no estimate extracted
  6 studies · 820 participants
  Low