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Urinary Sample Collection Methods in Ileal Conduit Urinary Diversion Patients a Randomized Control Trial Markku H

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Urinary Sample Collection Methods in Ileal Conduit Urinary Diversion Patients a Randomized Control Trial Markku H Ostomy Care Ostomy Care J Wound Ostomy Continence Nurs. 2018;45(1):59-62. Published by Lippincott Williams & Wilkins Urinary Sample Collection Methods in Ileal Conduit Urinary Diversion Patients A Randomized Control Trial Markku H. Vaarala ABSTRACT PURPOSE: The purpose of this study was to compare bacteriological urinalysis findings using 3 urinary sample collection methods (clean stoma catheterization, urine dripping from the stoma, urine collected from the clean urostomy pouch) in ileal conduit urinary diversion patients. DESIGN: Randomized controlled trial. SAMPLE AND SETTING: Twenty-seven patients with ileal conduit urinary diversion from an outpatient urology clinic were enrolled; 9 patients were seen twice, for a total of 36 subjects and comparisons. METHODS: Data were collected during a clinic visit by a trained research nurse. Patients were randomized into 2 groups: group A had the first urine sample collected by clean stoma catheterization, followed by sample collection by urine dripping from the stoma; group B had the first urine sample collection by urine dripping from the stoma, followed by sample collected by clean stoma catheterization. All patients had a third urine sample collected from a factory-clean urostomy pouch. Bacteriological urinalysis findings were compared among methods. Descriptive analyses were summarized using mean, percentage, and frequency. The mean ages of the patients between the groups were compared with the t test. Other between-group comparisons were performed using the Fisher exact test. Urinary culture finding differences among the same patients were evaluated using the McNemar test. Sensitivity and specificity of the different urine sample collection methods were calculated assuming urine sample collection by catheterization as a reference method. RESULTS: Uropathogen bacteria were detected in urinary culture in 16 of 36 samples (44%) collected by clean stoma catheter- ization, 15 of 36 samples (42%) collected by urine dripping directly from the stoma, and 13 of 35 samples (37%) collected from the clean urostomy pouch. Significant differences among the urine collection methods were not detected. Assuming catheter- ization as the most reliable method of sample collection, the sensitivity and specificity of the urine dripping from stoma collection method were 81.3% and 90.0%, respectively. The sensitivity and specificity of the urostomy pouch collection method were 73.3% and 90.0%, respectively. Among the same patients, there were no significant differences in the incidence of uropathogen bacteria when clean stoma catheterization was compared with urine dripping from the stoma and urostomy pouch methods. CONCLUSION: This study provides clinically relevant information regarding urine collection methods in ileal conduit patients. Urinary sample collection by urine dripping directly from the stoma or collected from a clean urostomy pouch provided similar uropathogen bacteria findings compared with sample collection by clean stoma catheterization. KEY WORDS: Ileal conduit, Randomized controlled trial, Urinary tract infection, Urine collection methods, Urine culture, Urine sample, Urostomy. INTRODUCTION includes urinalysis.1 Particularly after ileal conduit urinary di- version, asymptomatic bacteriuria is common5 and does not Cutaneous urinary diversion is commonly used for cancer pa- require treatment.5,6 Urinary samples may be collected by cath- tients requiring radical cystectomy1 or those with neurogenic eterization,7 by dripping the urine directly from the stoma,8 or urinary bladder disorder when other therapies have not been from a fresh urostomy pouch after stoma care.9 successful.2 The most commonly used cutaneous urinary diver- Urine sample collection by catheterization is regarded his- sion method is ileal conduit.3 Other widely used methods in- torically as the most reliable method for urine culture sam- clude ureterocutaneostomy.4 Patients with a urinary diversion ple collection.7,10 The other 2 methods, namely, dripping the require regular follow-up due to potential complications even urine directly from the stoma8 and collecting the urine from years after the diversion operation.1 Usually, this follow-up a fresh urostomy pouch after stoma care,9 were compared to this method with respect to uropathogen bacteria findings on Markku H. Vaarala, MD, PhD, Division of Operative Care and Medical urine culture. The purpose of this study was to compare bacte- Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, riological urinalysis findings using 3 urinary sample collection Finland. methods (clean stoma catheterization, urine dripping from the Conflict of interest: None declared. stoma, and urine collected from the clean urostomy pouch) Correspondence: Markku H. Vaarala, MD, PhD, Department of Surgery, Oulu in ileal conduit urinary diversion patients. The presence of University Hospital, PO Box 21, 90029 OYS, Finland ([email protected]). 104 or more uropathogen bacteria in urine culture was regard- DOI: 10.1097/WON.0000000000000397 ed as clinically significant finding.11 A secondary aim was to Copyright © 2018 by the Wound, Ostomy and Continence Nurses Society™ JWOCN ¿ January/February 2018 59 Copyright © 2018 Wound, Ostomy and Continence Nurses Society™. Unauthorized reproduction of this article is prohibited. 60 JWOCN ¿ January/February 2018 www.jwocnonline.com determine sensitivity and specificity for the different urine collection methods compared with clean stoma catheteriza- tion. As well, the presence or absence of uropathogen bacteria in urine culture between different urine collection methods among the same patients was evaluated. METHODS This study used a randomized controlled trial design. Eligi- ble patients followed up at Oulu University Hospital (Oulu, Finland) urology outpatient department were informed by a research nurse about the study, and written informed consent was obtained. Inclusion criteria were patients with an ileal con- duit urinary diversion, aged 18 years and older, and cognitive- ly intact. Exclusion criterion was patients with signs of symp- tomatic urinary tract infection (fewer, gross hematuria, and/or back pain). The research was approved by the Ethics Council of the Northern Osthrobothnia Hospital District, Oulu. After obtaining consent, patients were randomized 1:1 into 2 groups using a computer-generated block randomization meth- od with randomly varying block lengths of 2 and 4. Random- ization was performed in order to exclude an influence of the sequence of sample collection on outcome. The same patients were allowed to be randomized more than once to the trial with the requirement that the randomization was performed at dif- ferent prescheduled follow-up visits for the underlying disease. The minimum interval between consecutive randomizations of the same patients was 3 months. Randomized, sequentially numbered, opaque, sealed envelopes were generated. A research Figure. Study flowchart. nurse opened envelopes consecutively after each patient con- sented, and the patient was assigned to either of the groups. (self-made at Oulu University Hospital, Oulu, Finland). The Study procedures were performed during the same clinic visit. chromogenic plates were incubated a maximum of 72 hours A trained research nurse removed the urostomy pouch and in ambient air at 35°C, and chocolate agar plates were in- cleansed the stoma with sterile gauze moisturized with sterile cubated a maximum of 72 hours in a 5% CO2 atmosphere saline, using a circular motion from stoma opening outward. at 35°C. Identification of bacteria was performed using the Group A had the first urine sample collected by clean stoma MALDI-TOF (matrix-assisted laser desorption/ionization catheterization, followed by urine sample collection by drip- time-of-flight mass spectrometry) method (VitekMS, bio- ping urine from the stoma. Group B had the first urine sam- Merieux, France). For statistical analyses, urine cultures with ple collection by dripping urine from the stoma, followed by uropathogen bacteria (ie, gram-negative rod or gram-positive urine sample collected by clean stoma catheterization. Subse- cocci) showing 104 colony forming units (CFUs) or more/mL quently, all patients had a third urine sample collected from of urine were regarded as positive. Low polymicrobial bacteri- a factory-clean urostomy pouch. Urine sample was collected al count cultures were considered to be probable contamina- from the urostomy pouch immediately after there was approxi- tion.11 To describe detected bacteria, urine cultures showing mately 20 mL of urine present in the pouch. Sample collection more than 102 CFUs/mL of urine11 are separately shown in from the urostomy pouch was the last sample collection meth- Table 2. In Table 2, urine cultures with 102 or fewer CFUs/mL od for all study participants in order to minimize expenses to of urine were recorded as negative.11 the patients (ie, the cost of the urostomy pouch). The flowchart of the study is presented in the Figure. All urine samples were Data Analysis collected immediately after one another without further stoma Descriptive analyses were performed using mean, percentage, cleansing. Each urine sample was evaluated by urine culture. and frequency. The mean ages of patients in each group was Patient age and reason for diversion were recorded. Primary compared with the t test. Other between-group comparisons outcome measure was the incidence of uropathogen bacteria were performed using the Fisher exact test. A P value
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