The finding that climacteric symptoms are caused mainly by a decline of the oestrogen level and that their development can practically always be prevented by long-term local or gene- ral oestrogen treatment was a great asset to the treatment of this problem. Oestriol, a less effecti- ve natural oestrogen, has a favourable effect on urogenital tissues without stimulating the endometrium [2]. The objective of the present investigation was to analyze ultrasonographic parameters of the lower urinary tract in women after the menopause with the stress or mixed type of urinary incontinence before and after two-month local oestriol treatment (Ovestin). The trial comprised 40 women with confirmed stress (GSI) or the mixed type of urinary incontinence. The group with GSI comprised 124 patients and the group suffering from the mixed type of incontinence comprised 26 women. The type of incontinence was assessed by urogynaecological examination. This was followed by transperineal and introital ultrasound examination of patients in a supine position by means of an Acuson 128 XP10 apparatus using a convex probe with a fre- quency of 5MHz and a vaginal probe with a frequency of 7.0 MHz. Assessment of the position and mobility of the urethrovesical junction was implemented by the transperineal route using a con- vex probe and filling the bladder with 300 ml. After urination followed assessment of the urethral sphincter by the introital route in a vertical plane whereby the authors followed the anterior and posterior surface of the rhabdosphincter, and in a horizontal plane its left and right surface (10). The authors assessed also in both planes the maximal thickness of the sphincter. In the vertical plane and in a proximal position in relation to the urethra they evaluated the vascular supply qunatitatively (minimal - 1 to very abundant - 4) and also the arterial flow - the pulsatile index PI was investigated as well as the resistance index RI. In the vertical plane 1 cm from the urethrove- sical junction the authors assessed the thickness of the urethral mucosa; at the same level they evaluated the thickness of the urinary bladder wall: the anterior wall, the vertex and the area of the trigone. They assessed also the thickness of pelvic floor muscles. The assessments were made before and after two-month intravaginal oestriol administration (Ovestin crm) - two weeks 0.5 mg/day and then 0.5 mg twice a week. After treatment no statistically significant differences in thickness and areas of the urethral sphincter were found nor in the thickness of the pelvic floor muscles before and after oestriol administration. Statistically significant differences were recor- ded in the mobility of the urethrovesical junction and there was a significant increase in the thickness of the urethral mucosa and a more abundant vascularization was recorded during the quantitative evaluation and evaluation of PI. In women with the mixed type of incontinence after oestrogen treatment a decline in the thickness of the urinary bladder was found. Ultrasound examination of the lower urinary tract before and after oestriol treatment (Ovestin crm) is a use- ful supplement of common examination methods and it confirms its favourable therapeutic effect when administered by the intravaginal route. This work was supported by the Grant Agency of the Ministry of Health of the Czech Republic - grant No. 5636.

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