A new urethral catheterisation device (UCD) to manage difficult urethral catheterisation

Microbial Colonization and Associated Factors in Indwelling Urinary Catheters: A Cross-Sectional Study

This study aimed to determine microbial colonization in indwelling urinary catheters (UCs) and identify patient-specific risk factors associated with this colonization. This cross-sectional study involved 61 hospitalized intensive care unit patients with indwelling UCs. Bacterial colonization and susceptibility were assessed in the indwelling UCs from the second day onwards following urinary catheterization. The average duration of catheterization was 13.62 ± 13.72 days. Colonization of 10⁵ CFU/mL and above was determined in all indwelling UCs from the second day of catheterization onwards. The catheter was colonized by the following microorganism species: Pseudomonas aeruginosa, Acinetobacter baumannii, Proteus mirabilis, and Staphylococcus aureus. 47.9% of clinical isolates showed multi-drug resistance (MDR). Clinical isolates did not show significant differences based on patient variables such as age, Body Mass Index, and duration of urinary catheterization (p > 0.05). There was a weak correlation (rs:≤ 0.206; p > 0.05) between the species of clinical isolates and patient laboratory variables. Colonization was determined in all indwelling UCs, with nearly half of isolates exhibiting MDR. These findings highlight the urgent need for improved strategies to manage and prevent catheter-associated infections, particularly in high-risk patient populations.

Optimised Protocol for Managing Failed Catheterisation: Leveraging Bedside Retrograde Urethrography and Cystourethroscopy

Introduction Urethral catheterization is a routine procedure often required for many hospitalized patients. Various conditions, such as meatal stenosis, stricture urethra, false passage, benign prostatic hyperplasia, bladder neck contractures, and impacted urethral stones, can contribute to difficulty in catheterisation. In the setting of failed attempts at per urethral catheter placement, the subsequent intervention is suprapubic catheter (SPC) insertion. SPC placement has its associated complications and causes inconvenience to the patients. We framed an algorithm to minimise the need for SPC insertion in cases of difficult per urethral catheterisation in a non-trauma setting. This study aimed to evaluate the common causes of difficult per urethral catheterisation and establish the efficacy of our algorithm in managing difficult catheterisation with bedside retrograde urethrography (RGU) and cystoscopy while avoiding SPC placement. Materials and methods This prospective observational study was conducted from September 2022 to June 2024. Patients admitted with urinary retention or requiring routine catheterisation, with one failed attempt at catheterisation, were included in the study. Our algorithm for the management of difficult catheterisation in a non-trauma setting, to avoid SPC, integrates a bedside RGU and retrograde urethroscopy using either a 15.5 Fr cystoscope sheath or a 6 Fr ureteroscope to identify the urethral pathology, followed by dilatation and per urethral catheterisation. Results Among 55 patients (aged 34-82 years), 48 (87.27%) were male and seven (12.73%) were female. The most common indication for catheterisation was routine catheterisation for output monitoring (n = 30; 54.54%), followed by acute retention (n = 25; 45.45%). Bulbar urethral stricture (n = 28; 50.9%) was the most common cause of difficult catheterisation, followed by meatal/sub-meatal narrowing (n = 13; 23.63%), enlarged prostate or high bladder neck (n = 4; 7.27%), and impacted stones (n = 3; 5.45%). Successful catheterisation was achieved in 48 male patients following urethroscopy with a 6 Fr ureteroscope or 15.5 Fr cystoscope. In females, reducing the pelvic organ prolapse enabled catheterisation in two cases, while five required serial dilatation and catheterisation. Successful per-urethral catheterisation was achieved in all 55 (100%) patients, thus avoiding SPC. Conclusions Conventional blind catheterisation techniques have limited success in the setting of failed initial catheterisation. This approach, which employs bedside fluoroscopy and direct visualisation of the urethra using a cystoscope or ureteroscope, helped achieve higher success rates (n = 55; 100%) for difficult per-urethral catheterisation and avoided the need for SPC. Proper implementation of this protocol for dealing with difficult per-urethral catheterisation will reduce the unnecessary burden on the healthcare system by minimising the potential iatrogenic urethral injuries and reducing the need for SPC.

Safety and efficacy of fluoroscopy-guided urethral catheterization in case of failed blind or cystoscopy-assisted urethral catheterization

This retrospective study evaluated the safety and efficacy of fluoroscopy-guided urethral catheterization in patients who failed blind or cystoscopy-assisted urethral catheterization. We utilized our institutional database between January 2011 and March 2023, and patients with failed blind or cystoscopy-assisted urethral catheterization and subsequent fluoroscopy-guided urethral catheterization were included. A 5-Fr catheter was inserted into the urethral orifice, and the retrograde urethrography (RGU) was acquired. Subsequently, the operator attempted to pass a hydrophilic guidewire to the urethra. If the guidewire and guiding catheter could be successfully passed into the bladder, but the urethral catheter failed pass due to urethral stricture, the operator determined either attempted again with a reduced catheter diameter or performed balloon dilation according to their preference. Finally, an appropriately sized urethral catheter was selected, and an endhole was created using an 18-gauge needle. The catheter was then inserted over the wire to position the tip in the bladder lumen and ballooned to secure it. We reviewed patients' medical histories, the presence of hematuria, and RGU to determine urethral abnormalities. Procedure-related data were assessed. Study enrolled a total of 179 fluoroscopy-guided urethral catheterizations from 149 patients (all males; mean age, 73.3 ± 13.3 years). A total of 225 urethral strictures were confirmed in 141 patients, while eight patients had no strictures. Urethral rupture was confirmed in 62 patients, and hematuria occurred in 34 patients after blind or cystoscopy-assisted urethral catheterization failed. Technical and clinical success rates were 100%, and procedure-related complications were observed in four patients (2.2%). The mean time from request to urethral catheter insertion was 129.7 ± 127.8 min. The mean total fluoroscopy time was 3.5 ± 2.5 min and the mean total DAP was 25.4 ± 25.1 Gy cm2. Balloon dilation was performed in 77 patients. Total procedure time was 9.2 ± 7.6 min, and the mean procedure time without balloon dilation was 7.1 ± 5.7 min. Fluoroscopy-guided urethral catheterization is a safe and efficient alternative in patients where blind or cystoscopy-assisted urethral catheterization has failed or when cystoscopy-urethral catheterization cannot be performed.

Value and Limitations of Urethrotech Catheterisation Device to Manage Difficult Urethral Catheterisation in Male Spinal Cord Injury Patients

Methods

We used a Urethrotech catheterisation device in 57 male patients with spinal cord injury, in whom urethral catheterisation was unsuccessful or previous catheterisation was difficult.

Results

Urethrotech catheter could be inserted in 51 patients. No patient developed urinary tract infection. In one patient, the guidewire could not be introduced into the bladder, and a coude Foley catheter was inserted. In two patients, the guidewire was inserted into the bladder, but a 16 CH catheter could not be advanced over the guidewire. Emergency suprapubic cystostomy was performed in one case; in the other, urethral stricture was dilated; a size 12 CH catheter was inserted. In three patients, the guidewire curled back into the urethra because of severe spasm of the urethral sphincter. Catheterisation with a Tiemann catheter was successful after administration of diazepam and/or stretching of the anal sphincter by another health professional, which caused reflex relaxation of the urethral sphincter. Complications of Urethrotech catheterisation included urethral bleeding, haematuria, pain, doubling back of the guidewire due to spasm of the urethral sphincter or from an empty bladder. We adopted variations in technique, eg filling the bladder with saline prior to catheterisation when feasible, insertion of the guidewire by the side of the old catheter, use of Tiemann tip catheters, administration of antibiotics, diazepam to control spasms, nifedipine to control autonomic dysreflexia, analgesics, stretching of the anal sphincter to induce reflex relaxation of the urethral sphincter, urgent imaging studies to confirm correct positioning of the catheter, omitting anticoagulants and monitoring patients, who developed bleeding.

Conclusion

Use of Urethrotech in spinal injury patients warranted adaptations to the technique, which required expertise, experience, and backup facilities. To ensure patient safety, Urethrotech catheter should be used in a hospital setting, and by medical personnel with experience in the management of spinal cord injury patients.

Tackling catheter-associated urinary tract infections with next-generation antimicrobial technologies

Urinary catheters and other medical devices associated with the urinary tract such as stents are major contributors to nosocomial urinary tract infections (UTIs) as they provide an access path for pathogens to enter the bladder. Considering that catheter-associated urinary tract infections (CAUTIs) account for approximately 75% of UTIs and that UTIs represent the most common type of healthcare-associated infections, novel anti-infective device technologies are urgently required. The rapid rise of antimicrobial resistance in the context of CAUTIs further highlights the importance of such preventative strategies. In this review, the risk factors for pathogen colonization in the urinary tract are dissected, taking into account the nature and mechanistics of this unique environment. Moreover, the most promising next-generation preventative strategies are critically assessed, focusing in particular on anti-infective surface coatings. Finally, emerging approaches in this field and their likely clinical impact are examined.

A Prospective Multi-Institutional Evaluation of Iatrogenic Urethral Catheterization Injuries

OBJECTIVES

To perform a multi-institutional investigation of incidence and outcomes of urethral trauma sustained during attempted catheterization.

PATIENTS & METHODS

A prospective, multi-center study was conducted over a designated 3-4 month period, incorporating seven academic hospitals across the UK and Ireland. Cases of urethral trauma arising from attempted catheterization were recorded. Variables included sites of injury, management strategies and short-term clinical outcomes. The catheterization injury rate was calculated based on the estimated total number of catheterizations occurring in each center per month. Anonymised data were collated, evaluated and described.

RESULTS

Sixty-six urethral catheterization injuries were identified (7 centers; mean 3.43 months). The mean injury rate was 6.2 ± 3.8 per 1000 catheterizations (3.18-14.42/1000). All injured patients were male, mean age 76.1 ± 13.1 years. Urethral catheterization injuries occurred in multiple hospital/community settings, most commonly Emergency Departments (36%) and medical/surgical wards (30%). Urological intervention was required in 94.7% (54/57), with suprapubic catheterization required in 12.3% (n = 7). More than half of patients (55.56%) were discharged with an urethral catheter, fully or partially attributable to the urethral catheter injury. At least one further healthcare encounter on account of the injury was required for 90% of patients post-discharge.

CONCLUSIONS

This is the largest study of its kind and confirms that iatrogenic urethral trauma is a recurring medical error seen universally across institutions, healthcare systems and countries. In addition, urethral catheter injury results in significant patient morbidity with a substantial financial burden to healthcare services. Future innovation to improve the safety of urinary catheterization is warranted.

Clinical efficacy of retrograde urethrography-assisted urethral catheterization after failed conventional urethral catheterization

Background

Several approaches for urethral catheterization after the failure of initial urethral catheterization have been introduced. However, standard procedures regarding what should be done after failed conventional urethral catheterization have been not established. Therefore, we investigated the clinical efficacy of retrograde urethrography (RGU)-assisted urethral catheterization after failed conventional urethral catheterization.

Methods

Between July 2015 and July 2018, 136 patients who underwent RGU-assisted urethral catheterization after failed conventional urethral catheterization were included in this retrospective study. Patients’ clinical data, such as age, catheterization site, and previous history of urologic operations, were collected and assessed via chart review. Univariate and multivariate logistic regression analyses were performed to identify predictive factors for the failure of this procedure.

Results

Of the 136 patients, 94 (69.1%) experienced successful RGU-assisted urethral catheterization. Having a previous history of urologic operations, such as urethrotomy and transurethral prostatectomy, was identified as an independent predictive factor for the failure of RGU-assisted urethral catheterization (odds ratio = 9.453, 95% confidence interval = 2.703–33.063, p < 0.001).

Conclusions

RGU-assisted urethral catheterization can be one of the modalities for providing successful catheterization after failed conventional urethral catheterization. We believe that RGU-assisted urethral catheterization can be an effective procedure if patients have no previous history of urologic operations, such as urethrotomy and transurethral prostatectomy. Trial registration Soonchunhyang university institutional review board approval (No. 2018-08-021).

From indwelling Foley to fail-safe voiding: Proposed changes in design and thinking

The Foley indwelling urethral catheter (IDC) has been an effective part of the clinician’s armoury for more than 80 years. It meets wide clinical needs, such as overcoming urinary retention for men and perioperative management, but its use risks the major iatrogenic conditions of catheter-associated urinary tract infection and urethral injury (CAUI) – the latter mainly in men. This article focuses on CAUI, examines some factors contributing to these risks, makes suggestions for design solutions which may help tackle them and invites collaboration to develop more effective and fail-safe IDC or voiding solutions.

Innovations in indwelling urethral catheterisation

The indwelling urethral catheter remains an integral part of contemporary medical care, despite its significant design shortcomings. Urethral catheterisation is responsible for well-recognised complications including catheter-associated urinary tract infection (CAUTI), catheter-associated urethral injury (CAUI), catheter blockage, and bladder mucosal irritation. In this narrative review, we provide an update on current innovations in urethral catheter design, aimed at safeguarding against these complications. There is an obvious need to improve catheter technology and urologists should support the translation of innovations into clinical practice.

Long-term outcomes of urethral catheterisation injuries: a prospective multi-institutional study

PURPOSE

There are no prospective data describing the incidence and spectrum of long-term complications associated with traumatic urethral catheterisation (UC). We prospectively monitored the long-term clinical outcomes and complications of patients with traumatic UC injuries.

METHODS

A prospective study at two tertiary university hospitals was performed to record all referrals for iatrogenic urethral injuries caused by UC. Long-term follow-up was prospectively maintained by regular outpatient department visits and by monitoring all urological interventions and their outcomes from urinary catheter-related injuries.

RESULTS

The incidence of traumatic UC was 13.4 per 1000 catheters inserted in male patients and 37 iatrogenic urethral injuries were recorded. The mean age was 74 ± 12 years and the mean length of follow-up was 37 ± 3.7 months. Urethral injuries were caused by inflating the catheter anchoring balloon in the urethra (n = 26) or by creating a false passage with the catheter tip (n = 11). In total, 29 patients (78%) developed urethral stricture disease during their follow-up; of which 11 have required at least one urethral dilation and two have required one urethrotomy. Three patients required long-term indwelling suprapubic catheter placement and seven patients opted for a long-term indwelling urethral catheter. There were eight patient mortalities; one of which was due to severe urosepsis resulting from catheter balloon inflation in the urethra.

CONCLUSION

Catheter-related injuries are associated with significant long-term complications in this vulnerable patient cohort. In future, such injuries may be preventable if the safety profile of the urinary catheter is modified.