Clean Technique Self-catheterization Articles

Articles

  • Complications - Intermittent Catheters

    Urethral Adverse Events  |  Scrotal Complications  |  Bladder-related Complications  |  Pain  | Urinary Tract Infections  |  Causes of IC-related UTIs  |  Video Lecture  |  References

    Intermittent catheterization (IC) is the preferred procedure for individuals with incomplete bladder emptying from non-neurogenic or neurogenic lower urinary tract dysfunction (NLUTD). IC is now considered the gold standard for bladder emptying in individuals following spinal cord injury (SCI) who have sufficient manual dexterity (Groen et al., 2016; Wyndaele et al, 2012). Goals of bladder management in individuals with a SCI include prevention of infection, injuries or trauma, optimizing social continence and function, and preventing upper tract deterioration. Despite these recommendations, complications and adverse events can arise in both men and women but are seen especially in male patients performing intermittent self-catheterization (ISC) for long-term.

    Written by: Diane K. Newman, DNP, ANP-BC, FAAN
    References:

     

    1. Bailey, L. & Jaffe, W.I. (2017). Obstructuve uropathy. In: D.K. Newman, J.F. Wyman, V.W. Welch, (Eds). Core Curriculum for Urologic Nursing. (pp.405-421) Pitman, New Jersey: Society of Urologic Nurses and Associates, Inc.
    2. Casey, R.G., Cullen I.M., Crotty, T., & Quinlan, D.M.  (2009) Intermittent self-catheterization and the risk of squamous cell cancer of the bladder: An emerging clinical entity? Canadian Urological Association Journal, 3(5), E51-E54.
    3. Clarke, S.A., Samuel, M., & Boddy, S.A.  (2005). Are prophylactic antibiotics necessary with clean intermittent catheterization? A randomized controlled trial. Journal of Pediatric Surgery, 40, 568-571.
    4. Cornejo-Davila V, Duran-Ortiz S, Pacheco-Gahbler C. (2017). Incidence of urethral stricture in patients with spinal cord injury treated with clean intermittent self-catheterization. Urology. 99:260–4.
    5. Cortese YJ, Wagner VE, Tierney M, Scully D, Devine DM, Fogarty A. (2020). Pathogen displacement during intermittent catheter insertion: a novel in vitro urethra model. J Appl Microbiol. Apr;128(4):1191-1200. doi: 10.1111/jam.14533.
    6. Cox L, He C, Bevins J, Clemens JQ, Stoffel JT, Cameron AP. (2017). Gentamicin bladder instillations decrease symptomatic urinary tract infections in neurogenic bladder patients on intermittent catheterization. Can Urol Assoc J. Sep;11(9):E350-E354. doi: 10.5489/cuaj.4434
    7. de Avila MAG, Rabello T, de Araújo MPB, Amaro JL, Zornoff DCM, Ferreira ASSBS, de Oliveira AS. (2021). Development and Validation of an Age-Appropriate Website for Children Requiring Clean IntermittentCatheterization. Rehabil Nurs. 2021 Mar-Apr 01;46(2):65-72. doi: 10.1097/rnj.0000000000000253
    8. De Ridder, D. J. M. K., Everaert, K., Fernandez, L. G., et al. (2005). Intermittent catheterisation with hydrophilic-coated catheters (SpeediCath) reduces the risk of clinical urinary tract infection in spinal cord injured patients: A prospective randomized parallel comparative trial. European Urology, 48(6), 991–995
    9. Groen J, Pannek J, Castro Diaz D, Del Popolo G, Gross T, Hamid R, et al. (2016). Summary of European Association of Urology (EAU) Guidelines on Neuro-Urology. Eur Urol. 69:324–33.
    10. Kinnear, N., Barnett, D., O'Callaghan, M., Horsell, K., Gani, J, Hennessey, D. (2020). The impact of catheter-based bladder drainage method on urinary tract infection risk in spinal cord injury and neurogenic bladder: A systematic review. Neurourol Urodyn. 39(2):854-862. doi: 10.1002/nau.24253
    11. Marei MM, Jackson R, Keene DJB. (2021). Intravesical gentamicin instillation for the treatment and prevention of urinarytract infections in complex paediatric urology patients: evidence for safety and efficacy. J Pediatr Urol. 17(1):65.e1-65.e11. doi: 10.1016/j.jpurol.2020.08.007
    12. Mitchell BG, Prael G, Curryer C, Russo PL, Fasugba O, Lowthian J, Cheng AC, Archibold J, Robertson M, Kiernan M. (2021). The frequency of urinarytract infections and the value of antiseptics in community-dwelling people who undertake intermittent urinarycatheterization: A systematic review. Am J Infect Control. Jan 21:S0196-6553(21)00022-5. doi: 10.1016/j.ajic.2021.01.009
    13. Moussa M, Chakra MA, Papatsoris AG, Dellis A, Dabboucy B, Fares Y. (2021). Bladder irrigation with povidone-iodine prevent recurrent urinarytract infections in neurogenic bladder patients on clean intermittent catheterization. Neurourol Urodyn. Feb;40(2):672-679. doi: 10.1002/nau.24607. Epub 2021 Jan 21
    14. Newman, D.K., New, P.W., Heriseanu, R. Petronis, S., Håkansson, J., Håkansson, M.A., & Lee, B.B. (2020). Intermittent catheterization with single- or multiple-reuse catheters: clinical study on safety and impact on quality of life. Int Urol Nephrol. Aug;52(8):1443-1451. doi: 10.1007/s11255-020-02435-9. 
    15. Patel DP, Herrick JS, Stoffel JT, et al. (2020) Reasons for cessation of clean intermittent catheterization after spinal cord injury: Results from the Neurogenic Bladder Research Group spinal cord injury registry. Neurourology and Urodynamics. 39:211–https://doi.org/10.1002/nau.24172
    16. Stensballe, J., Loom, D., et al. (2005). Hydrophilic-coated catheters for intermittent catheterisation reduce urethral microtrauma: A prospective, randomised, participant blinded, crossover study of three different types of catheters. Eu Urol, 48, 978-983.
    17. Stillman MD, Hoffman JM, Barber JK, Williams SR, Burns SP. (2018). Urinary tract infections and bladder management over the first year after discharge from inpatient rehabilitation. Spinal Cord Ser Cases. Oct 19;4:92. doi: 10.1038/s41394-018-0125-0.
    18. Stohrer M, Blok B, Castro-Diaz D, Chartier-Kastler E, Del Popolo G, Kramer G, Pannek J, Radziszewski P, Wyndaele JJ. (2009). EAU guidelines on neurogenic lower urinary tract dysfunction. Eur Urol. 56:81--8. doi: 10.1016/j.eururo.2009.04.028.
    19. Vapnek, J.M., Maynard, F.M., & Kim, J.  (2003). A prospective randomized trial of the LoFric hydrophilic coated catheter versus conventional plastic catheter for clean intermittent catheterization. Journal of Urology.169, 994-998.
    20. Walter, M., Ruiz, I. Squair, JW., Rios, LAS., Averbeck, MA.,  Krassioukov, AV. (2020). Prevalence of self-reported complications associated with intermittent catheterization in wheelchair athletes with spinal cord injury. Spinal Cord. Oct 13. doi: 10.1038/s41393-020-00565-6. 
    21. Wyndaele JJ, Brauner A, Geerlings SE, Bela K, Peter T, Bjerklund-Johanson TE. (2012). Clean intermittent catheterization and urinary tract infection: review and guide for future research. BJU Int. 110:E910–7.
    22. Wyndaele, J.J.  (2002). Complications of intermittent catheterization: Their prevention and treatment. Spinal Cord, 40(10), 536-541.
    Published March 30, 2021
  • Definition - Intermittent Catheters

    What is an intermittent urinary catheter?

    Intermittent catheterization (IC) is the insertion and removal of a catheter several times a day to empty the bladder. The purpose of catheterization is to drain urine from a bladder that is not emptying adequately or from a surgically created channel that connects the bladder with the abdominal surface (such as Mitrofanoff continent urinary diversion).

    catheter

    Intermittent catheterization is widely advocated as an effective bladder management strategy for patients with incomplete bladder emptying due to idiopathic or neurogenic detrusor (bladder) dysfunction (NDO).

    Written by: Diane K. Newman, DNP, ANP-BC, FAAN
    References:
    1. Averbeck MA, Krassioukov A, Thiruchelvam N, Madersbacher H, Bogelund M, Igawa Y. The impact of different scenarios for intermittent bladder catheterization on health state utilities: results from an internet-based time trade-off survey. J Med Econ. 2018:1-8.
    2. Avery M, Prieto J, Okamoto I, et al. Reuse of intermittent catheters: a qualitative study of IC users' perspectives. BMJ open. 2018;8(8):e021554
    3. Beauchemin L, Newman DK, Le Danseur M, Jackson A, Ritmiller M. Best practices for clean intermittent catheterization. Nursing. 2018;48(9):49-54.
    4. DeFoor W, Reddy P, Reed M, et al. Results of a prospective randomized control trial comparing hydrophilic to uncoated catheters in children with neurogenic bladder. J Pediatr Urol. 2017;13(4):373.e371–373.e375.
    5. Goetz LL, Droste L, Klausner AP, Newman DK. Catheters Used for Intermittent Catheterization. Clinical Application of Urologic Catheters, Devices and Products. Cham: Springer International Publishing; 2018:47-77.
    6. Heard, L. & Buhrer, R. How do we prevent UTI in people who perform intermittent catheterization? Rehabilitation Nursing, 2005: (30): p 44–45. 
      Krassioukov A, Cragg JJ, West C, Voss C, Krassioukov-Enns D. The good, the bad and the ugly of catheterization practices among elite athletes with spinal cord injury: a global perspective. Spinal Cord. 2015;53(1):78-82.
    7. Lapides, J., Diokno, A.C., Silber, S.J., & Lowe, B.S., Clean, intermittent self-catheterization in the treatment of urinary disease. 1972. Urology:107;  p458.
    8. Lapides, J., Diokno, A.C., Silber, S.M., & Lowe, B.S. Clean, intermittent self-catheterization in the treatment of urinary tract disease. 1972. Journal of Urology: 167; p1584–1586.
    9. Newman DK. (2017). Devices, products, catheters, and catheter-associated urinary tract infections. In: Newman DK, Wyman JF, Welch VW, editors. Core Curriculum for Urologic Nursing. 1st ed. Pitman (NJ): Society of Urologic Nurses and Associates, Inc; 439-66.
    10. Newman DK, Willson MM. Review of intermittent catheterization and current best practices. Urol Nurs. 2011 Jan-Feb;31(1):12-28, 48; quiz 29. PubMed PMID: 21542441
      11. Vahr S, Cobussen-Boekhorst H, Eikenboom J, et al. Evidence-based guideline for best practice in urological health care. Catheterization. Urethral intermittent in adults. Dilatation, urethral intermittent in adults. . EAUN guideline. 2013.
    Published March 30, 2021
  • Indication of Catheterization for Intermittent Catheters (IC)

    Intermittent catheterization (IC) is the “gold standard” for individuals with bladder dysfunction caused by neurologic or non-neurologic causes, a significant and growing population in the United States.  Intermittent catheterization is the recommended method for individuals who are unable to void or completely empty the bladder.  According to the 6th International Consultation on Incontinence, IC has replaced long-term indwelling urinary catheterization for patients with neurogenic lower urinary tract dysfunction (NLUTD) resulting in incomplete bladder emptying as it is associated with less urologic and non-urologic complications.
    Written by: Diane K. Newman, DNP, ANP-BC, FAAN
    References:
    1. Apostolidis, A., Drake, M., Emmanuel, A., Gajewski, J., Heesakkers, J., Kessler, T., …..Wyndaele, J.J. (2017) Neurologic urinary and fecal urinary incontinence. In: P. Abrams P CL, L.Cardozo, A. Wagg, A.Wein (Eds). International Consultation on Incontinence 6th edition. (pp. 1093-1308).  Plymouth, UK: Health Publications Ltd.
    2. Averch, T.D., Stoffel, J., Goldman, H.B., Griebling, T., Lerner, L., Newman, D.K., Peterson, A.C. (2014) AUA White Paper on Catheter-Associated Urinary Tract Infections: Definitions and Significance in the Urologic Patient Workgroup, Retrieved from  https://www.sciencedirect.com/science/article/pii/S2352077915000308
    3. Blok B, J. P-F, Pannek J, Castro-Diaz D, Del Popolo G, Groen J, Hamid R, Karsenty G, Kessler TM (2018) Guidelines on Neuro-Urology. EAU European Association of Urology, Retrieved from  https://uroweb.org/wp-content/uploads/EAU-Guidelines-on-Neuro-Urology-2018-large-text.pdf
    4. Bladder management following spinal cord injury. Spinal cord injury rehabilitation evidence. 2014.  https://msktc.org/lib/docs/Factsheets/SCI_Bladder_Health.pdf Accessed March 18, 2021
    5. Cottenden, A., Fader, M., Beeckman, D., Buckley, B., Kitson-Reynolds, E., Moore, K…..Wilde, M. (2017) Management using continence products. In: P. Abrams P CL, L.Cardozo, A. Wagg, A.Wein (Eds). International Consultation on Incontinence 6th edition. (pp. 2303-2426). Plymouth, UK: Health Publications Ltd
    6. Gajewski, J.B., Schurch B, Hamid R, Averbeck, A., Sakakibara, R., Agro, E.F.,…Haylen, B.T. (2018). An International Continence Society (ICS) report on the terminology for adult neurogenic lower urinary tract dysfunction (ANLUTD). Neurourology and Urodynamics, 37:1152–1161.  https://doi.org/10.1002/nau.23397
    7. Gamé X, Phé V, Castel-Lacanal E, Forin V, de Sèze M, Lam O, Chartier-Kastler E, Keppenne V, Corcos J, Denys P, Caremel R, Loche CM, Scheiber-Nogueira MC, Karsenty G, Even A. (2020). Intermittent catheterization: Clinical practice guidelines from Association Française d'Urologie (AFU), Groupe de Neuro-urologie de Langue Française (GENULF), Société Française de Médecine Physique et de Réadaptation (SOFMER) and Société Interdisciplinaire Francophone d'UroDynamique et de Pelvi-Périnéologie (SIFUD-PP). Prog Urol. Mar 24. pii: S1166-7087(20)30054-3. doi: 10.1016/j.purol.2020.02.009
    8. Ginsberg D. (2013). The epidemiology and pathophysiology of neurogenic bladder. Am J Manag Care. 2013;19(10 suppl):s191-6. http://www.ncbi.nlm. nih.gov/pubmed/24495240
    9. Groen J, Pannek J, Castro Diaz D, Del Popolo G, Gross T, Hamid R, Karsenty G, Kessler TM, Schneider M, Hoen L, Blok B. (2016) Summary of European Association of Urology(EAU) Guidelines on Neuro-Urology. Eur Urol. 69(2):324-33. doi: 10.1016/j.eururo.2015.07.071
    10. Goetz, L.L., Droste, L., Klausner, A.P., & Newman, D.K. (2018). Intermittent catheterization. In: D.K. Newman, E.S. Rovner, A.J. Wein, (Eds). Clinical Application of Urologic Catheters and Products. (pp. 47-77) Switzerland: Springer International Publishing.
    11. Gould, C., Umscheid, C., Agarwal, R., et al.; Healthcare Infection Control Practices Advisory Committee (HICPAC). (2009). In Guideline for prevention of catheter-associated urinary tract infections. Atlanta, GA: Centers for Disease Control and Prevention (CDC). Retrieved from http://www.cdc.gov/hicpac/pdf/cauti/cautiguideline2009final.pdf
    12. Gould CV, Umscheid CA, Agarwal RK, Kuntz G, Pegues DA (2010) Guideline for prevention of catheter-associated urinary tract infections 2009. Infection control and hospital epidemiology : the official journal of the Society of Hospital Epidemiologists of America. 31(4):319-326. doi:10.1086/651091
    13. Kennelly M, Thiruchelvam N, Averbeck MA, Konstatinidis C, Chartier-Kastler E, Trøjgaard P, Vaabengaard R, Krassioukov A, Jakobsen BP. AdultNeurogenic LowerUrinary Tract Dysfunction and Intermittent Catheterisation in a Community Setting: Risk Factors Model for Urinary Tract Adv Urol. 2019 Apr 2;2019:2757862. doi: 10.1155/2019/2757862.
    14. Kinnear, N., Barnett, D., O'Callaghan, M., Horsell, K., Gani, J, Hennessey, D. (2020). The impact of catheter-based bladder drainage method on urinary tract infection risk in spinal cord injury and neurogenic bladder: A systematic review. Neurourol Urodyn. 39(2):854-862. doi: 10.1002/nau.24253
    15. Klausner, A.P., & Steers, W.D. (2011). The neurogenic bladder: an update with management strategies for primary care physicians. Med Clin North Am. 95(1):111-20. https://DOI: 10.1016/j.mcna.2010.08.027.
    16. Lavis T, Goetz LL. (2019) Comprehensive care for persons with spinal cord injury. Phys Med Rehabil Clin N Am. 30(1):55-72. doi:10.1016/j.pmr.2018.08.010
    17. Management of the neurogenic bladder for adults with spinal cord injuries. https://www.aci.health.nsw. gov.au/__data/assets/pdf_file/0010/155179/ Management-Neurogenic-Bladder.pdf Accessed March 20, 2021
    18. Milligan J, Goetz LL, Kennelly MJ. (2020). A Primary Care Provider's Guide to Management of Neurogenic Lower UrinaryTractDysfunction and Urinary Tract Infection After Spinal Cord Injury. Top Spinal Cord Inj Rehabil. Spring;26(2):108-115. doi: 10.46292/sci2602-108
    19. Newman, D.K. (2017). Devices, products, catheters, and catheter-associated urinary tract infections. In: D.K. Newman, J.F. Wyman, V.W. Welch (Eds). Core Curriculum for Urologic Nursing (pp. 429-466). Pitman, New Jersey: Society of Urologic Nurses and Associates, Inc.
    20. Newman, D.K., & Wein, A.J. (2009). Managing and treating urinary incontinence (2nd ed). Baltimore: Health Professions Press.
    21. Panicker JN. (2020) NeurogenicBladder: Epidemiology, Diagnosis, and Management. Semin Neurol. Oct;40(5):569-579. doi: 10.1055/s-0040-1713876.
    22. Tate DG, Wheeler T, Lane GI, Forchheimer M, Anderson KD, Biering-Sorensen F, Cameron AP, Santacruz BG, Jakeman LB, Kennelly MJ, Kirshblum S, Krassioukov A, Krogh K, Mulcahey MJ, Noonan VK, Rodriguez GM, Spungen AM, Tulsky D, Post MW. Recommendations for evaluation of neurogenicbladderand bowel dysfunction after spinal cord injury and/or disease. J Spinal Cord Med. 2020 Mar;43(2):141-164. doi: 10.1080/10790268.2019.1706033
    Published March 30, 2021
  • Prevention Strategies - Intermittent Catheters

    Adherence to basic daily prevention habits may help avoid UTIs in the higher-risk intermittent catheterization population.  The table below summarizes this information.

    The most important prevention measures in preventing a UTI are: 

    • adequate education
    • patient compliance
    • the use of appropriate catheter type and material
    • consistent catheterization technique 

    Less frequent catheterization results in higher catheterized urine volumes and places the patient at increased risk for developing a UTI.  More frequent catheterization and the avoidance of bladder overfilling is an extremely important prevention measure.

    Catheterization between four and six times a day is recommended for most individuals. More frequent catheterization, however, increases the risk of introducing harmful bacteria.

    Another measure that may reduce infection is the acidification of urine with cranberry juice or capsules, foods containing lactobacillus, and vitamin C capsules.

    Cranberries inhibit bacterial adherence to the uroepithelial wall and have been primarily studied with Escherichia coli (E. coli). In a community-based survey of patients with a spinal cord injury on intermittent catheterization, it was found that those who ingested cranberry or vitamin C agents decreased their incidence of UTI.

    Suggestions for Prevention of UTIs Associated with Intermittent Catheterization

     

    Maintenance of hygiene, particularly of the hands and perineum

    1. Hands should be thoroughly washed before attempting catheterization
    2. The genitalia should be washed daily with soap and water and always cleansed from front to back
    3. Preferable to perform catheterization before bowel program to minimize E. coli bacteria contamination of the urethra
    4. Immediate perineal hygiene is recommended after vaginal intercourse  
    5. Avoidance of spermicidal lubricants in sexually active females because these products may lower urethral flora

      2.   Teach male patients the correct positioning of the male urethra during insertion of the catheter to minimize trauma 

      3.   Be careful to avoid touching the tip of the catheter and/or letting it touch other surfaces

      4.   If a postmenopausal female patient has hypoestrogenized perineal tissue, consider transvaginal estrogen medication

      5.   Use a generous amount of lubricant along the length of the catheter, since dry catheters may cause excoriations in the
            urethra, leading to an entry point for bacteria contamination

      6.   Keep the bladder as empty as possible by having patients catheterize at least four to six times a day 
            Keeping the bladder as empty as possible will prevent over-distension of the bladder 

      7.   Encourage use of a new catheter each time performing intermittent catheterization  
            Most catheters are manufactured and packaged for single sterile use

      8.   Acidification of the bladder may prevent bacterial growth 
            In non-catheterizing populations, cranberry capsules and juice have been shown to help prevent the growth of bowel
            bacteria in the urethra and the bladder
            Cranberry ingestion may be contra-indicated in some patients (patients prone to oxalate or uric acid calculi) 
            Cranberry is contraindicated in patients on anticoagulation therapy and should not be recommended to this group
            Lactobacillus in the diet (yogurt) has been shown to prevent E. coli from growing in the urethra
            Hiprex® 1000 mg combined with vitamin C 1000 mg capsules twice daily is thought to acidify urine enough to prevent
            bacterial growth in the bladder and is recommended in patients with recurrent UTIs

    References

    Hess, M.J., Hess, P.E., Sullivan, M.R., Nee, M., & Yalla, S.V.Evaluation of cranberry tablets for the prevention of urinary tract infections in spinal cord injured patients with neurogenic bladder. Spinal Cord, 2008; 46(9), 622-626. 
    Igawa, Y., Wyndaele, J.J., & Nishizawa, O.  Catheterization: Possible complications and their prevention and treatment. International Journal of Urology, 2008; 15(6), 481-485.
    Jepson, R.G., & Craig, J.C.  Cranberries for preventing urinary tract infections. Cochrane Database System Review, 2, 2008 CD001321.
    Newman, D.K., Fader, M., & Bliss, D.Z. (2004). Managing incontinence using technology, devices and products. Nursing Research, 53(6, Suppl.), S42- S48.
    Newman, D.K., & Wein, A.J.  Managing and treating urinary incontinence (2nd ed). 2009 Baltimore: Health Professions Press.
    Woodbury M.G., Hayes K.C., & Askes H.K. Intermittent catheterization practices following spinal cord injury: A national survey. Canadian Journal Urology, 2008; 15(3), 4065-4071.
    Wyndaele, J.J. Complications of intermittent catheterization: Their prevention and treatment. Spinal Cord, 2002; 40(10), 536-541.
    Published February 1, 2013
  • Techniques and Procedures for Use - Intermittent Catheters

    Intermittent catheterization is the method of bladder management in patients with urinary retention caused by a neurogenic bladder.  Neurogenic bladder can be caused by 1) upper motor neuron disease (for example, central nervous system lesions, including stroke, Parkinson’s disease, and multiple sclerosis [MS]); 2) spinal cord injury, including MS of the cord, and cervical and thoracic disc disease; and 3) lower motor neuron disease (for example, pelvic nerve injury, peripheral neuropathy, diabetes mellitus). These conditions can cause bladder dysfunction necessitating the use of intermittent catheterization.
    Written by: Diane K. Newman, DNP, ANP-BC, FAAN
    References:
    1. Beauchemin, L. , Newman, D.K., Le Danseur, M., Jackson,A., &Ritmiller, M. (2018). Best practices for clean intermittent catheterization.  48(9): 49-54
    2. Bhatt, N. R., Davis, N. F., Thorman, H., Brierly, R., & Scopes, J. (2021). Knowledge, skills, and confidence among healthcare staff in urinary catheterization. Canadian Urological Association Journal15(9). https://doi.org/10.5489/cuaj.6986
    3. Goetz, L.L., Droste, L., Klausner, A.P., & Newman, D.K. (2018). Intermittent catheterization. In: D.K. Newman, E.S. Rovner, A.J. Wein, (Eds). Clinical Application of Urologic Catheters and Products. (pp. 47-77) Switzerland: Springer International Publishing. Moore, KN., Fader, M. & Getliffe, K. Long‐term bladder management by intermittent catheterisation in adults and children. Cochrane Database of Systematic Reviews4 (2007).
    4. Hakansson MA. (2014). Reuse versus single-use catheters for intermittent catheterization: what is safe and preferred? Review of current status. Spinal Cord. 52:511–6.
    5. Sun AJ, Comiter CV, Elliott CS. (2018). The cost of a catheter: an environ- mental perspective on single use clean intermittent catheterization. Neurourol Urodyn. 37:2204–8.
    6. van Doorn, T.Bertil F M Blok, BFM. (2020). Multiuse Catheters for Clean Intermittent Catheterization in Urinary Retention: Is There Evidence of Inferiority? Eur Urol Focus. 15;6(5):809-810. doi: 10.1016/j.euf.2019.09.018. 
    7. Walter, M, & Krassioukov, A.V. (2020). Single-use Versus Multi-use Catheters: Pro Single-use Catheters. Eur Urol Focus. 6(5):807-808. doi: 10.1016/j.euf.2019.10.001. 
    Published March 30, 2021