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Original Article

Rabbit Sphincter of Oddi has a Certain Autonomy: Characteristic Features

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Pages 525-533 | Received 30 Jun 1989, Accepted 08 Nov 1989, Published online: 08 Jul 2009
 

Abstract

Simultaneous recordings of electromyography and manometry were obtained from rabbit sphincter of Oddi (SO) and duodenum. Three different patterns of activity were observed in SO and in duodenum: 1) a low-amplitude (< 3 cm H2O) pattern of background oscillations with 2) superimposed high-amplitude (4-20 cm H2O) contractions and 3) occasional complex contractions consisting of an elevation of the basal pressure with superimposed smaller contractions. A certain SO autonomy was evident: 57.6% of SO pressure peaks could not be assigned to any duodenal activity. The distribution of SO pressure peak amplitudes could not be described by a simple normal distribution. The distribution of SO pressure peak amplitudes with concomitant duodenal activity differed from the overall distribution (p < 0.001). Whereas a substantial part of SO pressure peaks >; 4 cm H2O had no or low-amplitude corresponding duodenal pressure activity, duodenal pressure peaks >; 4 cm H2O almost invariably were associated with SO pressure peaks. It is concluded that rabbit SO does possess a certain autonomy, but at the same time a close functional connection exists between the two compartments.

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