Interrater reliability of bladder ultrasound measurements in children

Effect of bladder volume and compliance on ultrasonographic measurement of bladder wall thickness in children with neurogenic bladder dysfunction

BACKGROUND

Spina bifida is the most common cause of neurogenic bladder dysfunction in children. Measurement of bladder wall thickness (BWT) is non-invasive, low-cost, and may be complementary to urodynamics in demonstrating bladder condition. It is still unknown the wall thickness response to volume change in bladders with different compliance states.

OBJECTIVE

To determine the most appropriate measurement technique by revealing the differences in measurements performed in different compliance and volume conditions in children with neurogenic bladder.

STUDY DESIGN

In the prospective study in 2022, patients with spina bifida who continued their urological follow-up in our spina bifida center were included. Patients with a diagnosis of the neurogenic bladder who performed clean intermittent catheterization at least 4-6 times a day and had a recent urodynamic result in the last 6 months were included in the study. According to urodynamic results, patients were divided into two groups normocompliant (NC) and low-compliant (LC) bladders. BWT measurements were made from the anterior, posterior, right lateral, and left lateral walls of the bladder 3 times as full, half-volume, and an empty bladder.

RESULTS

The study included 50 patients (NC group n:21, LC group n:29). The mean age of 24 female and 26 male patients was 6.45 ± 4.07 years. In all BWT measurements, a significant increase in wall thickness was observed with decreasing bladder volume. The best correlation between bladder volume and BWT was found in the anterior wall with a weak negative correlation (p = 0.049, r = -0.280). However, lateral wall measurements were significantly higher in low compliant patients compared to normocompliant patients when the bladder was full. The mean right lateral wall thickness was 1.58 ± 0.68 mm in the NC group and 2.18 ± 1.35 mm in the LC group (p = 0.044). Left lateral wall thickness was 1.45 ± 0.44 mm in the NC group and 2.02 ± 1.4 mm in the LC group (p = 0.033).

DISCUSSION

Although standardization has been tried to be achieved in BWT measurements, we understand from the studies in the literature that there is no unity in practice.

CONCLUSION

Lateral wall measurements were found to be significantly higher in LC patients compared to normocompliants in full bladder suggesting that more accurate BWT follow-up can be performed with lateral wall measurements in neurogenic bladder patients if bladder compliance is low. The present study seems to be the first study in the literature in which bladder compliance and ultrasonographic bladder wall thickness measurements were evaluated together in children with neurogenic bladder dysfunction.

From Clinical Scenarios to the Management of Lower Urinary Tract Symptoms in Children: A Focus for the General Pediatrician

Lower urinary tract symptoms (LUTS) are a relevant problem in the pediatric population, having a very high prevalence. Diurnal incontinence and nocturnal enuresis are surely the most frequent symptoms, presenting, respectively, in up to 30% of school-age children and up to 10% of children between 6 and 7 years. Stypsis is the most common comorbidity, and it must be considered in the management of LUTS; indeed, the treatment of constipation is curative in most cases for both incontinence and enuresis. The presence or absence of diurnal symptoms in nocturnal enuresis and urgency in diurnal incontinence helps in the differential diagnosis. Urotherapy is always the first-line treatment, while oxybutynin and desmopressin (where appropriate) may help if the first-line treatment is unsuccessful. It is essential to identify conditions that are potentially dangerous for kidney and urinary tract well-being, for which LUTS can be the first manifestation. Starting from a series of clinical scenarios, we will underline the diagnostic clues behind LUTS in children and we will summarize clinical and surgical approaches for the proper management of these conditions.

Combination therapy (desmopressin plus oxybutynin) improves the response rate compared with desmopressin alone in patients with monosymptomatic nocturnal enuresis and nocturnal polyuria and absence of constipation predict the response to this treatment

Combination therapy (CT) (desmopressin plus oxybutynin) has been considered for the treatment of monosymptomatic nocturnal enuresis (MNE). We designed our study with the aim to evaluate the response rate to CT compared with desmopressin alone (primary outcome) and to identify factors associated with the response to CT (secondary outcome). We prospectively enrolled children with MNE with absent/partial response after 3 months of evening treatment with 240 mcg of desmopressin. We defined the response rate to CT compared with desmopressin alone according to the standardization of terminology document of the International Children's Continence Society: no-response, < 50% reduction; partial response, 50 to 99% reduction; and complete response, 100% reduction of wet nights. Both partial response and complete response to CT were clustered for the analyses of this manuscript. The enrolled children treated with 240 mcg/evening of desmopressin had also an additional evening administration of 0.3 mg/kg oxybutynin. A follow-up was scheduled at 3 and 6 months after the beginning of CT. At 3 months, oxybutynin dose was augmented to 0.5 mg/kg in case of absent/partial response to CT. Nocturnal diuresis was measured in 5 wet nights prior the beginning of therapy with desmopressin. Nocturnal polyuria (NP) was defined as nocturnal urine production > 130% of the expected bladder capacity. All patients with constipation were treated with macrogol. We enrolled 81 children (35.8% females) with a mean age of 8.4 ± 2.3 years. Seventy-eight patients completed the follow-up. After the CT, 59/78 (75.6%) patients showed an improvement of the response with CT compared with desmopressin alone. At multivariate analysis, both NP in more than 1 night (OR = 8.5; 95% CI, 1.4-51.6; p = 0.02) and absence of constipation (OR = 7.1; 95% CI, 1.6-31.0; p = 0.009) resulted significant after Bonferroni correction.

CONCLUSIONS

CT determines an improvement of response compared to therapy with desmopressin alone in 75.6% of patients. Significant predictive factors of response to CT were presence of NP and absence of constipation.

WHAT IS KNOWN

• Combination therapy (CT) (desmopressin plus anticholinergic drug) has been described as a therapeutic option for patients with monosymptomatic nocturnal enuresis (MNE) not responding to desmopressin alone as first-line treatment. • Variable protocols and variable combination of drugs have been described with a response rate ranging from 44 to 76%.

WHAT IS NEW

• We found that 59 patients (75.6%) treated with evening administration of 240 mcg of sublingual desmopressin plus 0.3-0.5 mg/kg of oxybutynin had an improvement of response compared to treatment with desmopressin alone. • We add evidence that presence of frequently recurring nocturnal polyuria and absence of constipation are predictors of response to CT.

Catheter test: A reliable alternative to assess adequacy of bladder management in patients of PUV in developing countries

INTRODUCTION

Following posterior urethral valve ablation, persisting bladder dysfunction can lead to lack of improvement or worsening of hydronephrosis and as well, to lack of improvement or even worsening renal function. On the other hand, managing bladder dysfunction offers the possibility of lessening both the degree of hydronephrosis and the level of serum creatinine. As we have no available urodynamics we feel impelled to find other means of diagnosing and managing abnormal bladder dynamics in these boys. We wanted to determine if a short course of continuous bladder drainage would be an effective means of lowering abnormal serum creatinine levels. Based on an assumption that most bladders following valve ablation, especially in those boys with a persistently elevated serum creatinine post valve ablation, have some form of dysfunction, we wanted to determine if a short course of continuous catheter drainage could improve these abnormal serum creatinine levels.

METHODS

The study was conducted over a 3year period and included all children up to 3 years of age who had higher age-appropriate nadir serum creatinine, 3 months post valve ablation. Patients were followed up at 1 week, 2 month and 3-month post valve ablation. On third follow-up visit patients with an elevated serum creatinine level were subjected to continuous bladder drainage (catheter test) for 5 days and serum creatinine level was recorded at the end of 5th day. Enforced bladder management which included dose titration of anti-muscaranic drugs and clean intermittent catheterization (CIC) with or without nocturnal catheter drainage (NOC) was instituted for next 3 months. Serum creatinine was determined at the end of the 3 month period and compared with prior values.

RESULTS

A total of 21 patients were included in the study. The mean age of the children at the time of valve ablation was 6.97 ± 4.38 months. There was a significant fall in serum creatinine from 0.64 ± 0.12 mg/dl pre 5 days of drainage to 0.48 ± 0.10 at the end of the 5 day period (p = 0.024) along with a significant rise in GFR (p = 0.001). Following 3 months of enforced bladder management, there was a very mild rise in creatinine to 0.51, a normal age adjusted value.

DISCUSSION

The study demonstrates the importance of early diagnosis of bladder dysfunction in boys with an elevated serum creatinine levels post valve ablation. Elevated nadir serum creatinine 3 months post ablation seems to be a useful indicator of possible bladder dysfunction; lowering of serum creatinine following a 5 day trial of continuous bladder drainage confirms this diagnosis. However, the lack of availability of urodynamic testing leaves the specific type of bladder dysfunction undiagnosed.

CONCLUSION

Lowering of serum creatinine following a 5-day trial of continuous bladder drainage can be used as a rough indicator of existing bladder dysfunction in boys with a history of PUV and should be used in countries without urodynamic equipment as an indicator for at least a 3 month trial of enforced bladder management.

Evaluation of non-invasive tests as diagnostic tools in assessment of bladder outlet obstruction severity in men with anterior urethral stricture

Introduction

The aim of this article was to evaluate non-invasive tests, which were typically used in preoperative diagnosis of male patients with anterior urethral strictures in the assessment of the urethral resistance caused by urethral occlusion.

Material and methods

A total of 63 adult males with confirmed urethral stricture and aged below 55 years old were enrolled in the study. Data obtained from non-invasive tests such as uroflowmetry (UF), ultrasound examination (USG), and questionnaires such as from The International Prostatic Symptom Score (IPSS), and The Patient-Reported Outcome Measure for Urethral Stricture Surgery (USS-PROM) were analyzed.

Results

Among all analyzed non-invasive tests, bladder wall thickness (BWT) showed the highest correlation with the degree of urethral occlusion described as percentage of preserved urethral lumen (r = -0.70; p <0.0001). UF variables presented medium degree of correlation, with maximum flow rate (Qmax) as the best parameter (p = 0.45; p = 0.0005). Results from both questionnaires did not show any correlation with the severity of the urethral stricture. Multiple linear regression analysis showed that only BWT was an independent predictor in detection degree of urethral occlusion.

Conclusions

UF and USG seem to be useful additional diagnostic tools in assessment severity of urethral occlusion in men suffering from anterior urethral stricture. Among them, USG had the highest correlation with degree of urethral occlusion.