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Morphine can actually be used in nuclear imaging of the gallbladder. Following the administration of a very small dose of morphine, there is contraction of the sphincter of Oddi and thus this allows for filling of the gallbladder with radiotracer due to increased pressure in the common duct, in other words, it allows us to shorten the time it takes to do a test to look for acute cholecystitis (a surgical emergency) and thus shortening the time of the examination without compromizing the accuracy of the results. This allows us to exploit one of the physiologic effects of the agent on the sphincter of Oddi.
In lay terms, it's used in diagnostic nuclear imaging of the abdomen.
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