Study protocol.  Study protocol. (A) Patients were randomly allocated to placebo or amitriptyline treatment for four weeks. At the end of the month there.

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 Study protocol.  Study protocol. (A) Patients were randomly allocated to placebo or amitriptyline treatment for four weeks. At the end of the month there was a three week washout, followed by crossover for four weeks of the alternate treatment. Assessment of symptoms, and rectal distension with functional magnetic resonance imaging (fMRI) was performed at the end of each treatment phase (arrows). (B) Rectal distension and fMRI were performed as indicated. A series of nine distensions (three at each pressure) were administered for 40 seconds each, followed by a 30 second baseline at 4 mm Hg during either stressful sounds of babies crying or relaxing music, the order determined randomly. Distensions were repeated with the alternate stress condition. Subjects rated the intensity of the most intense stimuli at the end of each series of stimuli (arrows). V Morgan et al. Gut 2005;54:601-607 Copyright © BMJ Publishing Group Ltd & British Society of Gastroenterology. All rights reserved.