Morphofunctional changes of the pelvic organs under conditions of stress urinary incontinence and experimental vaginal prolapse
Keywords:experimental study, stress urinary incontinence, experimental vaginal prolapse
Objective of the study was to analyze the particulars of morphofunctional changes in pelvic organs under conditions of stress urinary incontinence and experimental vaginal prolapse.
Materials and methods. The experimental studies were conducted on 50 sexually mature white female rats divided into three groups. The first control group consisted of intact animals; the
2-nd group consisted of animals with replicated stress urinary incontinence model; and the 3-rd group consisted of animals with a combined model, in which, after replication of the stress urinary incontinence model, the vaginal vault fixation to sacro-uterine ligaments was broken, thus causing vaginal prolapse. After withdrawal of animals from the experiment, histological studies of bladder, urethra and vulva were carried out.
Study results. After replication of the stress urinary incontinence and vaginal prolapse model, the destructive processes in the mucous membranes of the bladder, urethra, and vulva were developing, the volume of connective tissue in muscle membranes was increasing, the collagen fibers were thickening, and one could observe changes thereof with manifestations of destruction within a 30-day period. A combination of these processes led to an alteration of histoarchitectonics and the muscle ratio and connective tissues in membranes covering the study organs in both groups. Pathological changes accompanied by structural rebuild of bladder, urethra, and vulva tissues were more pronounced in the combined model.
Conclusions. Replication of the stress urinary incontinence model in the bladder of female rats caused an overactive state of the above, while the muscle membranes of urethra and vulva became moderately atonic. The combined stress urinary incontinence and vaginal prolapse model used by us was successfully replicated in all animals of the experimental group, which was confirmed by morphofunctional changes in the bladder, urethra and vulva tissues. Functional changes dominated in animals with the stress urinary incontinence model. The animals with a combined stress urinary incontinence and vaginal prolapse model presented with functional changes predominantly observed on day 14, and changes in the histoarchitectonics of the study organs on day 30. Replication of the combined stress urinary incontinence + vaginal prolapse model resulted in swelling of the vulva tissues, accompanied by growth and consolidation of collagen fiber bundles, muscular and mucosal membranes atrophy, and decreased quantity of microcirculatory bed vessels. Pathological changes in structural elements of the vulva after application of the combined model suggested a trophic disturbance, which was confirmed by a decrease in the density of capillaries by 34.24% and fibrosis of arteriolar membranes.
- Petros, P. The Female Pelvic Floor. Function, Dysfunction and Management According to the Integral Theory. New York (2007).
- Popov, А.А. Modern aspects of diagnostics, classification and surgical treatment of descent and prolapse of female genital organs. Thesis abstract for MD degree. Мoscow (2001): 38 p.
- Smolnova, T.Y., Adamian, L.V., Sidorov, V.V. “Special aspects of microcirculation in descent and prolapse of the internal genital organs in women of reproductive age.” Obstetrics and Gynecology 1 (2007): 39–44.
- Troiano, L., Pregazzi, R., Bortoli, P., Madai, M. “Postpartum urogenital and perineal prolapse.” Minerva Gynaec 52.7–8 (2000): 299–305.
- Sanakoeva, T.M. Special aspects of surgical correction of genital prolapse in elderly and senile patients. Thesis abstract for PhD degree. Мoscow (2004): 24 p.
- Mawajdeh, S.M., Al-Qutob, R.J., Farag, A.M. “Prevalence and risk factors of genital prolapse. A multicenter study.” Saudi Med J 24.2 (2003): 161–5.
- Falconer, C. “Decreased collagen synthesis in stress-incontinent women.” Obstet Gynaec 84.4(1994): 583–6
- Goh, J.T. “Biomechanical properties of prolapsed vaginal tissue in pre- and postmenopausal women.” Int Urogynecol Pelvic Floor Dysfunct 13 (2002): 76–9.
- Silva, W.A., Karram, M.M. Vaginal surgery for incontinence and prolapse. London. Springer (2006).
- Krasnopolskij, V.I., Bujanova, S.N. “Descent and prolapse of vagina and uterus.” In: Diseases of the cervix, vagina and vulva, ed. by V.N. Prilepskaja. Мoscow. MEDpress-inform (2003); 367–96.
- Smolnova, T.Y., Bujanova, S.N., Saveljev, S.V., Petrova V.D. “Connective tissue dysplasia as one of the causes of urinary incontinence in women with prolapse.” Urology 2 (2001): 25–30.
- Kulikovskij, V.F., Olejnik, N.V. Pelvic prolapse in women. Мoscow. GEOTAR-Media (2008): 256 p.
- Brading, A.F. “A myogenic basis for the overactive bladder.” Urology 50.6 (1997): 57–67.
- Savchuk, R.V., Kostev, F.I., Sejfullina, I.I., Shmatkova, N.V. “Regulation of contractile activity of the bladder in vitro and in vivo.” Men’s health 2.29 (2009): 179–82.
- Drake, M.J., Fowler, C.J., Griffiths, D. “Neural control of the lower urinary and gastrointestinal tracts: supraspinal CNS mechanisms.” Neurourol Urodyn 29.1 (2010): 119–27.
- MPK G09B 23/00. Patent for useful model No.127669. “Method of modeling stress urinary incontinence” u201804534; Announced on April 25, 2018; Published on August 10, 2015 bulletin No.5.
- МПК Г09Б 23/00. Патент на корисну модель №127669.
- Denisov, S.D. “Requirements to scientific experiment with animal involvement.” Health care 4 (2001): 40–2.
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