[Echographic diagnosis and treatment of urethral instability].

Unstable urethra as defined by the International Continence Society is the condition where loss of urine is caused solely by a fall in urethral pressure. But the condition is rare and therefore the term Urethral Pressure Variations (UPV) is better used. The UPV are caused by activity of smooth and striated muscles. Frequently is associated with Genuine Stress Incontinence or Detrsor Instability that can make worse urinary loss. An urogynecologic work-up can reveal the presence of UPV by Urodynamic and ultrasound evaluations. The Urethral Pressure monitoring reveals the fast or slow intraluminal pressure fall between 10 to 20 cm H2O or more. The ultrasound examination carried out by a linear vaginal probe (5 MHz) can observe the contraction of the "prepubic muscle" (anterior pubo-urethral ligament + bulbo-spongious muscle) as a preliminary phase of urethral pressure fall. The prepubic muscle located from clitoris to the external meatus exert a force on the anterior and distal part of the urethra during the intraluminal pressure falls. With the section of this structure (muscle + ligament) we treated 9 patients diagnosed as having UPV with concomitant irritative urologic symptoms. Out of 9 women with a follow-up ranged from 1 to 23 months (mean 9,5), 5 patients (56%) were cured, 2 (22%) of them were improved, in the last 2 (22%) patients no change was observed. The complications were minimal only a vestibulo-vaginal increased sensitivity, and one case of dyspareunia.(ABSTRACT TRUNCATED AT 250 WORDS)