Abstract

To investigate the effect of rectal distension on bladder sensation volumes and the number of detrusor contractions in patients with overactive bladder (OAB) symptoms. A prospective randomized study included patients with OAB symptoms. Multichannel urodynamic studies were completed with and without rectal balloon distension. Bladder sensation volumes and detrusor contractions were compared. Twenty-six patients were included in the study. The mean age was 67 years and mean BMI was 28.3 kg/m(2) . Bladder sensation volumes were lower with rectal distention as follows: normal desire to void (139 ml SD, ±114 vs. 197 ml SD ±150, P = 0.01), strong desire to void (260 ml SD ±171 vs. 330 ml SD ±172, P = 0.01), and maximum cystometric capacity (326 ml SD ±183 vs. 403 ml SD ±180, P = 0.0001). There was no difference in the number of detrusor contractions or the bladder volume at which the first detrusor contraction had occurred with and without rectal distension. Rectal distention in patients with OAB symptoms significantly lowered bladder sensation volumes (normal desire, strong desire, and maximal capacity).

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