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The myoelectric and manometric activities of the sphincter of Oddi were recorded in 8 patients using an original probe passed through the papilla of Vater during duodenoscopy. The sphincter of Oddi's myoelectric activity showed rhythmic bursts of action potentials which appeared in correspondence with the ascending phase of the phasic pressure waves. On the basis of these results, we believe that electromyography could in some cases replace manometry for studying sphincter of Oddi motility, since it avoids pressure perfusion of the bilio-pancreatic tract, with its concomitant risks, and provides sufficient information for motor studies.
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