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An ampullometrogram (AMG) was done in 20 patients to evaluate the rectal ampulla as a functional unit. Results were compared to a cystometrogram (CMG). The AMG displayed a normal curve (capacity 230 to 330 ml; pressure 47 to 80 cmH2O) in 14 of 16 patients having a normal CMG. The AMG was hyporeflexic (variable capacity; no increase in pressure at capacity) in 3 of 5 patients having a hyporeflexic CMG and hyperreflexic (capacity less than 175 ml, pressure over 80 cmH2O) in one patient having a hyperreflexic CMG. This technique might represent a useful clinical adjunct in the evaluation of bladder dysfunction, the evaluation of neurogenic type bowel dysfunction, and in the possible use of functional electrical stimulation for treatment of faecal incontinence or constipation.