|Year : 2012 | Volume
| Issue : 2 | Page : 156-158
Bladder stones in catheterized spinal cord-injured patients in Nigeria
AA Kawu1, A Olawepo2, OOA Salami3, SA Kuranga4, H Shamsi5, EA Jeje6
1 Department of Orthopaedics, University of Abuja Teaching Hospital Gwagwalada, Abuja FCT, Nigeria
2 Department of Anatomy, University of Ilorin, Ilorin, Nigeria
3 Department of Surgery, National Orthopaedic Hospital, Yaba, Lagos, Nigeria
4 Department of Surgery, University of Ilorin Teaching Hospital, Nigeria
5 Department of Orthopaedics, KMC Manipal, Mangalore, India
6 Department of Surgery, Lagos Univesity Teaching Hospital, Lagos, Nigeria
|Date of Acceptance||26-Apr-2011|
|Date of Web Publication||16-Jun-2012|
A A Kawu
Spine Unit, Department of Orthopaedics, University of Abuja Teaching Hospital, Gwagwalada, PMB 228, Abuja FCT
| Abstract|| |
Objective: The objective was to determine the incidence of bladder stones in patients with spinal cord injury (SCI) and to assess if catheter encrustation or positive urinary culture of Proteus mirabilis is predictive of bladder stones. Background: Bladder stones are common urological complication in those with SCI managed with indwelling urinary catheter. Detection and removal of bladder stones are important to prevent possible further complications.
Design : This was a prospective cohort study.
Materials and Methods: Ultrasound scan was performed in persons with SCI seen from 1st January to 31st December 2009 who had indwelling urethral catheter for at least 3-month post-injury. Indwelling urethral catheters were examined for encrustation at the time of removal, urine culture taken specifically for P. mirabilis and ultrasound scan done to detect bladder stones.
Results: There were 89 patients with spinal cord injury and 68 (76.4%) patients were evaluated during the review period. Twenty-nine (42.6%) patients had bladder stones and 22 (32.3%) patients had catheter encrustation. Of the 22 patients with catheter encrustation, 19 (86.3%) also had bladder stones. Forty-six (67.6%) patients had no catheter encrustation. Of these, 7 (14.7%) were found to have bladder stones. Thirty-seven (38.2%) urine cultures were positive for P. mirabilis. Of these 37 (54.4%) patients, 27 also had bladder stones. Catheter encrustation (P = 0.004) and a positive urine culture of P. mirabilis (P = 0.007) in patients with indwelling urinary catheter is highly predictive of the presence of bladder stone.
Conclusions : This study shows that a large number of SCI patients have an indwelling urethral catheter and suggests that ultrasound scan for the presence of stone should be schedule in a catheterized SCI patient if catheter encrustation or a positive urine culture of P. mirabilis is noted.
Keywords: Bladder stones, spinal cord injuries, ultrasound scan, urethral catheter
|How to cite this article:|
Kawu A A, Olawepo A, Salami O, Kuranga S A, Shamsi H, Jeje E A. Bladder stones in catheterized spinal cord-injured patients in Nigeria. Niger J Clin Pract 2012;15:156-8
|How to cite this URL:|
Kawu A A, Olawepo A, Salami O, Kuranga S A, Shamsi H, Jeje E A. Bladder stones in catheterized spinal cord-injured patients in Nigeria. Niger J Clin Pract [serial online] 2012 [cited 2013 May 18];15:156-8. Available from: http://www.njcponline.com/text.asp?2012/15/2/156/97294
| Introduction|| |
Spinal cord injury (SCI) in Nigeria is an age old problem. ,,,, There is an increase use of the indwelling urinary catheter in SCI patients because of the increase number of patients with cervical injury, also in women with a high-level injury with adductor spasticity and in order to shorten hospital stay patients are discharged early to rehabilitation with indwelling urinary catheter. , With this increase in indwelling catheter use, there is an attendant increase in complications resulting from its use.
Linsenmeyer et al, noted the important role of indwelling catheters at increasing the risk of bladder stones in spinal cord-injured patients. The indwelling catheter has been implicated in bladder stones formation that are a common urological complication in SCI. ,, In tandem with the indwelling catheter, Proteus mirabilis a urease-producing bacterium, alkanizes urine promoting crystallization of struvite and calcium phosphate leading to stone formation.≠  Bladder stones can cause blockage of the catheter leading to bladder distension and consequent autonomic dysreflexia in those with thoracic injuries at T6 level. ,
The objective of this study is to determine the incidence of bladder stone in patients with SCI with an indwelling urethral catheter and to assess if catheter encrustation or a positive urinary culture of P. mirabilis is predictive of bladder stone in Nigerian subjects.
| Materials and Methods|| |
The records of patients admitted at the University of Abuja Teaching Hospital, Gwagwalada from 1st January 2009 to 31st December 2009 were prospectively reviewed. All patients with a SCI who were admitted in our institution had an indwelling urethra catheter for at a least duration of 3 months since the injury and gave an informed consent were included in this study. Ethical approval was obtained before the commencement of this study.
All patients in this study had their catheters personally change by the first author. Catheters were examined for crust and catheter tips send for microscopy, culture, and sensitivity. Data extracted include catheter tip culture for P. mirabilis, presence or absence of stone crust on the catheter and presence or absence of bladder stone on ultrasound scan.
Bladder stone recorded following a least duration of 3 months of the indwelling urethral catheter were designated as dependent variables to identify potential risk associations. Data were analyzed using the chi-square analysis or Fisher's exact test. The predictive measures were determined by crude odds ratios (ORs) and adjusted odds ratios (adjusted ORs). The ORs were adjusted using multivariate logistic regression; 95% confidence intervals (CI) were used and P-value of <0.05 was significant. Statistical Package for Social Sciences (SPSS) 17.0 was employed for this analysis.
| Results|| |
Sixty-eight SCI patients with indwelling urethral catheter were enrolled and evaluated in this study after 3 months of catheter use. There are 29 (42.6%) patients with bladder stones. Catheter encrustation was noted in 22 (32.4%) patients. Of these 22 patients, 19 (86.3%) also had bladder stones. In other words, a positive result for catheter encrustation had a positive result for bladder stones 86.3% of the time. Thirty-six individuals had no catheter encrustation; 3 (8.3%) of these patients were found to have bladder stones. This is depicted in [Figure 1].
|Figure 1 : Catheter encrustation and the presence of bladder stone (the figure on the y-axis is the actual number of patients)|
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[Figure 2] shows the relationship between positive culture of P. mirabilis and the presence of bladder stone. Proteus mirabilis was cultured in 37 (22.1%) patients. Of these 37 patients, 27 (73.0%) also had bladder stones. A positive result (73.0%) for culture of P. mirabilis had a positive result for bladder stones. Thirty-one individuals had no positive culture for P. mirabilis, 2 (5.9%) of these patients were found to have bladder stones. [Table 1] shows the statistical analysis of the positive predictive value of catheter encrustation and a positive culture of P. mirabilis. The association between bladder stone, catheter encrustation, and positive culture of P. mirabilis is shown in [Table 2].
|Figure 2 : Proteus mirabilis culture and the presence of bladder stone (the figure on the y-axis is the actual number of patients)|
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|Table 1: Predictive value of catheter encrustation and a positive culture of Proteus mirabilis|
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| Discussion|| |
Indwelling catheter is an adjunct in the management of SCI in Nigeria. ,,,, This study showed that majority of the SCI patients in our study have an indwelling urethral catheter. This agree with findings by other workers ,,,, who noted a higher use of indwelling urethral catheter in SCI. The catheter stones result from synergism of bacteria such as P. mirabilis that alkalinizes the urine and promotes crystallization of struvite and calcium phosphate facilitated by foreign body like the catheter leading to catheter encrustation. ,,,,,, Formation of this small stones set up a cascade leading to more stone formation despite a change in catheter. This stone may block the catheter lumen obstructing urinary flow causing bladder distension. ,
The "gold standard" to detect bladder stones is through the use of cystoscopy.  Ultrasound scanning was however used in this study to detect bladder stone because it is noninvasive, easily available, reproducible, and cheap. This is considering that majority of our patients live on less than a dollar a day in Nigeria.  Complications  like were not recorded in this study.
This study shows a strong correlation between bladder stone, positive culture for P. mirabilis, and catheter encrustation. In the study by Linsenmeyer et al., they noted an 85% chance that bladder stones are present if there is catheter encrustation. In our study we also noted 86.3% chance despite different modality used to detect the stone. Also a positive culture for P. mirabilis provides an excellent correlation with the presence of bladder stones. In this study, if there is a positive culture for P. mirabilis, there is a 73.0% chance that bladder stones are also present. Therefore, if at any time a catheter is noted to be encrusted or there is a positive culture for P. mirabilis, a patient should be scheduled for ultrasonography to detect stone.
A small number of patients who had bladder stone had neither positive culture for P. mirabilis nor catheter encrustation; therefore to avoid missing bladder stones in such patients, ultrasonogram should be scheduled yearly for all patients to detect bladder stone.
| Conclusion|| |
This study shows that a large number of SCI patients have an indwelling urethral catheter. There is also a high association between bladder stones and the presence of catheter encrustation or positive culture of P. mirabilis. It therefore suggests that ultrasound scan for the presence of stone should be schedule in a catheterized SCI patient if catheter encrustation or a positive urine culture of P. mirabilis is noted.
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[Figure 1], [Figure 2]
[Table 1], [Table 2]