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Having just read the other posts on this - after my
reply - I think some people are confusing 'mechanical delivery'
(presumably meaning instrumental) with 'mechanisms of labour'. Mechanisms refer
to the nature of the passage of the baby through the pelvis, and were taught
extensively in my student days. They do help one to understand just what
is happening with regard to descent, rotation, and advancement of the baby and
are different with each type of presentation, OA, OP, breech, face, brow
etc.
We were taught that mento-posterior absolutely
cannot deliver vaginally, but I'm sure a few have managed to get through, small
baby in a generous sized pelvis. It would be a difficult vaginal birth
though and few would attempt it given a choice. Mento-anterior though is
really no harder than OA, but the dimension of the head as it flexes upwards and
sweeps the perineum, would be larger than 'normal' and we were taught it was an
absolute indication for an episiotomy - that was a while ago and I know better
now.
The birth I refered to was quite delightful, and as
the baby had only extended her head to a face presentation at the last minute,
she was not excessively bruised. some I have seen have very severe facial
swelling/bruising due to 'forwards' moulding of the face.
Actually, I did not know this girl, having just
taken over her care when she suddenly started to push - when I saw two little
lips appearing, for a moment I thought it was an undiagnosed breech (labia).
When I saw the little nose I was much relieved!
Regards, Sue
PS
just home from late shift and had a lovely birth of
baby complete in membranes!
"The only thing necessary for the triumph of evil is for good men to do
nothing"
Edmund Burke
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