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Re: Induction Differences?From: R J Connell (rowan@pavilion.co.uk)Sun Oct 29 06:31:59 1995
> >in Australia it is considered risky to use artificial oxytocics in the >>>presence of intact membranes since the contraction strength is >>>unpredictable and can be as much as 80 times greater than normal >>>contaction strength. This increases the risk of rupture of the uterus. > >I don't know who sent this post, but does anyone on the list believe that >oxytocin causes contractions that are 80 times as strong as natural >contractions? Jeffrey Phelan gave a talk on Medico-Legal issues at the >recent World Symposium of Perinatal Medicine and cited a 1975 study showing >equal contraction duration, frequency, and pressure among natural >contractions, oxytocin induced contractions and PG induced contractions. > >Bill Katz >(William H.Katz,MD,FACOG) >katz@maine.com > I agree with Bill. Simply look at trials with Intrauterine pressure catheters. Measuring IUpressure accurately you can "safely" increase Oxytocin infusions to quite high levels. It is more the receptiveness of the myometrial oxytocin receptors and oxytocin levls that govern the strength. This receptiveness increases through labour. I have not read of oxytocin causing anything near 80 times stronger than "natural", but I would be interested....... Rowan Connell >
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