Urethral pressure variations in healthy male volunteers

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Abstract
Urethral pressures are usually considered to be static and only few authors have emphasized timerelated pressure changes. We conducted a study on 10 healthy male volunteers, monitoring the urethral pressures at maximal urethral closure pressure, 2.5 cm proximal (bladder neck) and 2.5 cm distal (pars bulbosa) respectively over 30 min periods. At the bladder neck only sporadic waves were seen. At maximal clusure pressure alsmost permanent oscillations were found, the wavelenghts and amplitudes showing big differences. At the pars bulbosa 2 persons showed only sporadic oscill ions and in 7 we found permanent pressure variatiens. The pressure variations are proposed to represent peristaltic activity with the ability of experlling the last drops of urine after micturition and posing a mechanical barrier to ascending microorganisms.