From Midwifery Today:
 
labor longer than 12 hours

OP 49.7%

Persistent fetal occiput posterior position: obstetric outcomes. Obstet Gynecol 2003; 101:917
 
Interestingly enough, in reading VBAC management terms, one of the guidelines is that a partogram should be used and if a vbac woman slips past the 'accepted' cm/hour that obstetric intervention should be discussed.
 
Now if the above stat is accurate then 50% of all OP vbacs would fail to meet the criteria of the cm/hour...
 
No wonder that vbac success rates do not truly reflect the accepted possible numbers of successful vbac rates!
 
just venting.
Jo

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