Optimization Of Partial Bladder Outlet Obstruction In Animal Model

Objective: Obstructive bladder disease is the main problem that affects the bladder function and quality of life in elderly men.Thus,it would have great significances to improve bladder function and improve quality of life in patients by study of the field.In the academic community,the previous view has long been recognized that pressure-flow studies(PFS)as the gold standard for p BOO with obstructive lower urinary tract symptoms,which not only destroys the continuity of the bladder,but also differs from the clinically used transurethral method.Based on the traditional model,the purpose of this study was to explore the significance and value of modification in p BOO animal model.Methods: Twenty mice and rats were divided into three groups(control,sham-operated and p BOO group)respectively.The cystometry and IAP assessments were measured by the pediatric venous indwelling sheath and coronary dilatation catheter connected to Laborie urodynamic system on postoperative day 7.Data was collected simultaneously through urethra and rectum in each group.In addition,bladder histology was assessed to confirm p BOO.Results: The novel method can collect the urodynamic parameters successfully,including the BLPP,IAP,MBC,etc.IAP was elevated in p BOO rats,but no significantly difference was found between the sham-operated rats and the control rats.The hypertrophy of detrusor muscle in bladder section was observed by Masson trichrome staining in p BOO group compared with other groups.Conclusion: Our novel method based on innovative research implement for cystometry and IAP assessments in rodents is a reliable and replicable approach for evaluating the lower urinary tract function.Especially it provides detailed information to evaluate lower urinary tract structures and function in the early stage of p BOO.Objective: Open surgery is the most commonly used methodological approach for generating a partial bladder outlet obstruction(p BOO)animal model.Surgical suturing closing a part of the urethral meatus induces comparable pathophysiological changes in bladder and renal functions,but the optimum degree of obstruction that closely mimics the clinical pathology of p BOO has not been elucidated.We investigated the optimum obstruction level by performing a comprehensive time-dependent analysis of the stability and reliability of this novel animal model.Methods: Female BALB/c mice were divided into three groups according to the degree of urethral meatus stricture(UMS).Non-operated mice served as controls,and a p BOO model generated using the traditional method served as a positive control.A cystometric evaluation and long-term studies were performed to evaluate the validity and reliability of this novel animal model.An additional 35 mice were used to investigate the protein expression levels and histopathological features 24 hours and14 days postoperatively,respectively.Results: The characteristic cystometry features in the UMS group revealed increased changes in pressure-related parameters compared with the control.The 1/3 UMS model is an optional p BOO animal model because the cystometric evaluation and histopathological studies revealed a striking resemblance between the 1/3 UMS model and the model generated using the traditional open-surgery method.Conclusion: The minimally invasive UMS model required less time and produced minimal alterations in pathophysiologically relevant processes compared with the traditional surgery model.Suturing to cause UMS produced effective and repeatable patterns in bladder function investigations in mice.