Influence of urodynamic conditions on bladder sensations and detrusor activity in patients with multiple sclerosis.

AIMS: The study aimed to assess the impact of bladder filling rate and fluid temperature during urodynamics on bladder sensations and volume of apparition of detrusor overactivity in patients with multiple sclerosis (PwMS). METHODS: Consecutive PwMS assessed with a standardized urodynamic test including three consecutive cystometries (20 ml/min, 100 ml/min, and 100 ml/min with 4°C fluid (Ice water test [IWT]) between June 2020 and March 2022 were included in this retrospective study. Data collected were bladder sensation with first desire to void (FDV) and strong desire to void (SDV). The presence of detrusor overactivity (DO) and the volume of the first uninhibited detrusor contraction were recorded. RESULTS: One hundred and fifty-seven patients (mean age 47.4 ± 11.8 years, median EDSS 3 IQR[2-5], 73.9% of women) were included. Increased filling rate induced delayed bladder sensations (FDV 219 ± 109 ml vs. 194 ± 100 ml; SDV 349 ± 113 ml vs. 322 ± 124 ml for 100 ml/min and 20 ml/min filling rate, respectively, p < 0.001). Ice water increased bladder sensations with earlier reports of needs to void (FDV 163 ± 99 ml vs. 218 ± 117 ml; SDV 263 ± 104 ml vs. 351 ± 112 ml respectively; p < 0.001). Thirty-four patients had DO during both 20 ml/min and 100 ml/min fillings, without difference in the volume of apparition (p = 0.78). Forty-four patients had DO during both 100 ml/min and IWT. Detrusor overactivity appeared for a reduced volume during IWT compared with room temperature fluid perfusion (-68 ml [-95 to -41]; p < 0.001). CONCLUSION: Filling rate and fluid temperature impact bladder sensations during cystometry in PwMS. Ice water decreased the volume of the first uninhibited detrusor contraction.

Ice water test in multiple sclerosis: A pilot trial.

OBJECTIVES: To investigate the significance of the ice water test in patients with multiple sclerosis and to evaluate a novel ice water test nomogram in a large patient cohort. METHODS: A total of 201 ice water tests of patients with multiple sclerosis were retrospectively evaluated. Incontinence episodes in 24 h and sex were correlated with the ice water test. Furthermore, an ice water test nomogram was developed in order to categorize the detrusor overactivity in severity degrees. Descriptive statistics were carried out for population characteristics. Correlations of categorical variables were calculated by the χ2 -test. The independent t-test was carried out for correlations of continuous variables. Furthermore, the data were evaluated in the novel ice water test nomogram. RESULTS: The patient population consisted of 141 (70.1%) women and 60 (39.9%) men. A clinically positive ice water test (maximum detrusor pressure >15 cmH2 O) was identified in 75 patients (37.3%). Significantly more men presented a clinically positive ice water test (P = 0.006). In 16.5%, the ice water test unmasked an involuntary detrusor contraction, although routine cystometry did not show any detrusor overactivity. The ice water test nomogram could be successfully applied. The incontinence episodes and maximum detrusor pressure correlated positively with a higher categorization in the nomogram. Therapeutic interventions and follow-up controls could be successfully illustrated by the nomogram. CONCLUSIONS: The ice water test is a simple tool for unmasking non-identified detrusor overactivity in neurogenic bladder dysfunction. A severity categorization of the detrusor overactivity can be facilitated by the use of the ice water test nomogram. After further validation, the ice water test could be ultimately used in future as objective assessment for bladder dysfunction.

[Menthol in the control of bladder activity: A review]. / Le menthol dans le contrôle de l'activité de la vessie : revue de littérature.

INTRODUCTION: Menthol is a natural compound, of which the known effects on human physiology are manifold (a feeling of freshness, decongestant, bowel antispasmodic). Its implication in vesico-sphincteral physiopathology has been studied since the nineties. METHOD: Literature review of the previous studies having implied menthol in pelvi-perineal physiology through the articles indexed on the Pubmed database, with keywords menthol, menthol and bladder, menthol and toxicity, and TRPM8. Only articles in English were selected. RESULTS: Of the 30 articles that were included, most demonstrated the existence of a micturition reflex to menthol and cold, mediated by the C-type nerve to the spine through activation of TRPM8 urothelial receptors. More recent experiments paradoxically showed an inhibitory effect of menthol on detrusor contractility, independently of TRPM8, when muscle tissue is directly exposed to the compound. However, similar effects of targeted cutaneous exposure or urothelial exposure on detrusorian function have also been demonstrated through TRPM8. This receptor also appears to be involved in interstitial cystitis and idiopathic detrusor overactivity. Lastly, the potential toxicity of menthol appears negligible. Most of the referenced studies are related to animal experiments. Of the three studies that implied humans, only one elucidates some therapeutic applications. CONCLUSION: It seems that menthol and its receptors are involved in vesico-sphincteral physiopathology and could provide therapeutic potential in detrusorian overactivity and interstitial cystitis with reduced toxicity.

A Nomogram to Characterize the Severity of Detrusor Overactivity during the Ice Water Test: Description of the Method and Proof of Concept.

AIMS: To develop a nomogram with severity categories for detrusor overactivity (DO). METHODS: By conducting ice water tests (IWT) in 55 patients with Parkinson's disease, we identified criteria to describe characteristics of the detrusor pressure curves: (1) a gradient of Δpdet over Δt at the maximum detrusor pressure and (2) the area under the curve. In a nomogram, 10 severity categories of DO were established: 1 and 2 were assigned to group A (mild), 3 and 4 to group B (moderate) and 5-10 to group C (severe). RESULTS: In the nomogram, negative IWT (20) appeared in category 1. Positive IWT (35) spread over the categories 1-8, 17 in group A, 11 in group B and 7 in categories 5-10. A relationship of incontinence episodes and nomogram category was observed. The nomogram category was reproducible in repeated IWT. Therapeutic interventions to treat DO lowered the nomogram category. CONCLUSION: From the relationship of detrusor pressure and time in the IWT, a nomogram with 10 severity categories of DO was developed. First observations show a relationship of nomogram category and the number of incontinence episodes, reproducibility in repeated tests and the representation of effects of therapeutic interventions to treat DO.

Usefulness of ice water test to unmask detrusor overactivity.

PURPOSE: Ice Water Test (IWT) is not frequently used today. IWT triggers a non-inhibited involuntary detrusor contraction (NIDC) when the bladder is being filled with cold saline solution. NIDC is unmasked via a segmental reflex loop different from the physiological micturition reflex. Our purpose was to search for usefulness of IWT to expose detrusor overactivity (DO). METHODS: One hundred and seventy-nine IWT performed in patients with overactive bladder syndrome (OAB) and conventional cystometry (CC) non-contributive to diagnosis were retrospectively analyzed. An increase of detrusor pressure of 15cm H2O allowed defining positive IWT (with leakage) or intermediate (without leakage). RESULTS: The population comprised of 131 women (58.2±17.3 years) and 48 men (56.1±15.3 years). Main complaints were mixed or urge incontinence (76/179). Hundred and twenty-four patients had a history of neurological disease. From CC, detrusor behavior was founded uncategorized for 106, normal for 53 patients and underactive for 20. These results did not contribute to diagnose a DO. IWT was positive for 22 patients and intermediate for 20. DO was unmasked by IWT for 42 patients (23.4%) of whom 34 had neurological disease. The positive predictive value was 80.9%, the negative predictive value was 34.3%. CONCLUSION: In patients with OAB syndrome, IWT is contributory to unmask DO when CC is not contributive. Our study underlines the interest to perform IWT when urodynamic diagnosis is unclear.

The Place of the Ice Water Test (IWT) in the Evaluation of the Patients with Traumatic Spinal Cord Injury.

In the last decades, functional Urology developed itself as a subspecialty, and, although is strongly linked to Urology, it has its own language, devices and dedicated people. The ice water test (IWT) was first described in 1957 and gained its place in the armamentarium of functional urologists for the coming years. Now, when urodynamic devices are more and more complex and sensitive, when neuromodulation and neurostimulation are gaining popularity and with the terminology changes of the last decade, one can wonder if a 50 years old test may still be of some use. We performed a prospective study using the ice water test in 150 consecutive patients referred to us for urodynamics in order to identify if there is any improvement in the diagnostic process. The patients were referred for varied indications, but a large number of them were neurogenic, given the special profile of our unit. We classified the patients in four different groups and analyzed the data for each group. The results showed that, while there is no use of the IWT as a routine procedure, the test might prove extremely useful in selected cases.

Ice Water Urodynamic Study in Neurogenic Bladder of Spinal Cord Injured Patients

OBJECTIVE: To determine the clinical utility of ice water test for the urodynamic study in neurogenic bladder of spinal cord injured patients. METHOD: Warm water (20~30oC) urodynamic studies were performed on 66 spinal cord injured patients. Subsequently, ice water (4~8oC) urodynamic studies were performed. We determined the ice water test to be positive if the reflex volume of ice water urodynamic study is lower than the volume of the warm water urodynamic study. RESULTS: Ice water test was positive in 24 (55.8%) and negative in 19 (44.2%) of the 43 patients showing hyperreflexic detrusor activity in warm water urodynamic study. Ice water test was negative in all 23 cases showing areflexic detrusor activity. No significant difference was found between positive and negative ice water test groups for the level of injury, sex, age, extent of injury and duration since injury. If water was cool enough, positivity of ice water test was not affected by infusion rate. There was no difference between the two urodynamic studies of maximal bladder pressure and compliance. CONCLUSION: This study suggests that ice water urodynamic study is a useful method for the evaluation of hyperreflexic neurogenic bladder activated by cold specific receptors via C afferent fibers in spinal cord injured patients.

The Study of Factors in Cystometry and Ice Water Test / 대한비뇨기과학회지

PURPOSE: The goal of cystometry is the reproduction of the patient's clinical status to improve diagnosis and therapy. However practitioner should know that various factors such as temperature and speed of saline infusion can change the cystometry finding. The ice water test(IWT) is known as a simple method that it discriminate between upper and lower motor neuron lesion. The aim of this study is to clarify the relationship of factors occurred during cystometry and the usefulness of IWT. Materials and Methods: On the first study(Apr 1997 to Jun 1997), cystometry was performed in 60 patients with voiding difficulty. In this study we determined cystometry finding according to alteration of temperature(1 degrees C, 37 degrees C) and speed (20ml/min, 50ml/min) of saline infusion during consecutive cystometry. On the second study(Jun 1997 to Aug 1997), IWT was performed in 68 patients with voiding difficulty. The IWT was performed after cystometry with the patient in the supine position. The bladder was completely emptied, and 100ml of sterile 1 degrees C saline was infused within 250-300ml/min. In patient with a maximal cystometry capacity below 200ml, a volume of about half the capacity was infused. The test was considered positive if a sustained bladder contraction above 20cmH2O was registered or some of the cold saline was expelled within 1 minute. RESULTS: There was no relation between speed and temperature of infused saline about maximal bladder capacity, detrusor pressure and compliance during cystometry. Positive result of IWT was found in 31 (54.4%) among 57 patients with neurologic lesion and in 29(63.0%) among 46 patients with upper motor neuron lesion. In contrast, 10(90.9%) among 11 patients with non-neurological lesion and 8(72.7%) among 11 patients with lower motor neuron lesion was negative. Specificity for discrimination of upper motor neuron lesion and lower motor neuron lesion was 72.7%. CONCLUSIONS: It is concluded that cystometry finding was no relation between speed and temperature of infused saline about maximal bladder capacity, detrusor pressure and compliance during consecutive cystometry. The IWT is a simple supplementary urodynamic test that increases the precision of the diagnosis of upper motor neuron lesion. Thus, it was close enough to be used as a available procedure for subclinical upper motor neuron lesion.