Study design, materials and methods
45pediatric patients who were with indwelling catheter were contained in our research group, there were 22 male patients and 23 female patients ,and the mean age were 10.5±5.86 .Excluded criteria:1. Actue urinary tract infection 2.congnition disorder3.age>18 4.urethral stricture.5.patients were not with catheter before test.ALL urodynamic study were done by an urodynamicist with at 5 years experience and results were reported by an urologist with at least 10 years experience. All 45 patients had recieved 2 times urodynamic study at one examination time ,the first time using normal process to test（test 1） and the second time using the special connection equipment to connect the indwelling catheter and the urodynamic measurement tube(test 2). Urodynamic measurements during the two times test in each patients were observed ,the bleeding ratio during and after test, VAS score were all observed.
Results
through urine flow mechanics in the first test(test 1) and the second test(test 2)respectively, we found that the test 1 and test 2 patients with corresponding urine flow dynamic positive detection rate are consistent, the test 1 checked out of 15 patients with detrusor contractions fatigue; Bladder outflow tract in 21 patients; Low compliance bladder in 7 cases; There were 2 cases of detrusor hyperactivity, and all positive results were consistent in the same patient in both groups. Bleeding occurred in 1 case (2.2%). In the test 2, 8 patients (17.7%) had bleeding during the examination. During the examination, the average VAS score of the experimental group was (1.12 0.58). The average VAS score of the control group was 3.88 ±1.01. 2.1 the test 1 and test 2 patients with urinary flow mechanics test results is the same in the two groups of different experimental detection rate and detection in the process of disease (positive), the detection rate and disease there is no statistical difference of detection rate, the specific detection are shown in table 1.
2.2 the test 1and test 2 in the process of checking bleeding group in the process of testing result in bleeding patients for 1 case (2.2%), test 2 adopts the traditional way of examination hemorrhage patients in the process of 8 cases (17.7%). Comparison of the two times test showed that the bleeding rate in the test 1 was significantly lower than that in the test 2(P<0.05), and the difference was statistically significant.
2.3 in the test 1 and test 2 check, check after the pain score of two groups of VAS score after check in and check the test 1 were lower than the test 2 (P < 0.05), statistically significant difference.
Interpretation of results
Urodynamic study was limited used at present clinical works because of the invasive process, especially in the patients with some heigh risk factors, such as older age、 underlying diseases, the injure were often unavoidable in the process of inspection, so after the inspection process the bleeding and infection situation were common in clinical cases, especially for the patients who were have long-time retain indwelling catheter ，will be at a higher risk of bleeding and infection after UDS. So how to find an approach which both can be safety and effective in patients with indwelling catheter becoming an interesting question in our clinical urodynamic works , with a long-time clinical summary and observation, our center has designed a special connection equipment which used for the patients with indwelling catheter during urodynamic study, which can keep patients with original indwelling catheter as their measurement tubing .So due to that ，we can decrease the risk of invasiving approaches during our urodynamic study. Through this study, we can find this kind of equipment used in the patients with indwelling catheter during urodynamics test was not obvious effects on the test results at the same time reduced the bleeding ratio caused by repeated catheter putting process, and also can decreased complications such as infection and pain.By this study we can find that the urodynamics study with this special connection equipment was both efficacy and safety.
Concluding message
Urodynamic study was limited used at present clinical works because of the invasive process, especially in the patients with some heigh risk factors, such as older age、 underlying diseases, the injure were often unavoidable in the process of inspection, so after the inspection process the bleeding and infection situation were common in clinical cases, especially for the patients who were have long-time retain indwelling catheter ，will be at a higher risk of bleeding and infection after UDS. So how to find an approach which both can be safety and effective in patients with indwelling catheter becoming an interesting question in our clinical urodynamic works , with a long-time clinical summary and observation, our center has designed a special connection equipment which used for the patients with indwelling catheter during urodynamic study, which can keep patients with original indwelling catheter as their measurement tubing .So due to that ，we can decrease the risk of invasiving approaches during our urodynamic study. Through this study, we can find this kind of equipment used in the patients with indwelling catheter during urodynamics test was not obvious effects on the test results at the same time reduced the bleeding ratio caused by repeated catheter putting process, and also can decreased complications such as infection and pain.By this study we can find that the urodynamics study with this special connection equipment was both efficacy and safety.