C. This is injected in to rectum slowly by a rubber catheter and funnel. The column of the fluid is watched by intermittent screening and radiographs are taken later. The flow of barium is regulated by a control clip. At the end of the examination, the contents of the lower bowel can be siphoned off in to the pail. Predigested food can be given rectally as rectum can absorb fluids.
Epsom salt is dissolved in boiling water and cooled.
It is used to reduce raised intracranial pressure by osmotically drawing fluid into the gut. It should be given slowly and retained as long as possible. The patient is asked to lie in left lateral position with knees bent up. The foot end of the bed is raised to ensure that the fluid may travel upto the caecum. The temperature of the fluid is tested and the tip of the catheter is lubricated.