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This is a study of the stomach and small intestine that is performed by placement of a multi-lumen tube through the mouth into the small intestine. Positioning of the tube is facilitated by endoscopy and fluoroscopy to place a guide-wire through the stomach into the proximal intestine. Perfusion of the lumens or solid-state transducers placed along the tube allows measurement of the pressure profile of the stomach and small intestine. These profiles are measured over 5 hours during fasting and after a standard meal and provide confirmation of mechanical obstruction or identify features suggesting intestinal nerve (neuropathy) or muscle damage (myopathy). 

Risk for complications: +                    Discomfort: ++