Biomarkers in Urine for Children With Monosymptomatic Nocturnal Enuresis and Nocturnal Polyuria

Study Overview
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Brief Summary
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The aim of the study is to identify protein markers in relation to the enuresis related nocturnal polyuria by using mass spectrometry on nocturnal urine samples. A biomarker for nocturnal polyuria would simplify an important part of the clinical characterization of enuresis patients.

Detailed Description
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Involuntary voiding during sleep, nocturnal enuresis (NE), affects 7-10 % of all 7-year-olds, and 0.5-2 % of young adults. Night-time polyuria is one of the main pathogenic mechanisms. Today, the only method to diagnose nocturnal polyuria is home recordings involving diaper weight and registrations of first morning voids, which is very time-consuming. By using mass spectrometry (proteomics and metabolomics) on nocturnal urine samples from children with NE, the investigators aim to identify protein markers in relation to nocturnal polyuria. The perspective is to simplify an important part of the clinical characterization of NE patients. This hypothesis-generating pilot project will be performed on 10 boys with NE. The children will have to collect: Urine at bedtime on a wet and a dry night. Urine during a wet night through a collecting device (non-invasive). First morning voided volume following both a wet and a dry night. Furthermore, we will include 10 children without NE, who will collect urine during a dry night (first morning voided volume). Endpoints are any biomarkers in urine found to be associated with nocturnal polyuria. The proteomics and metabolomics methodologies are available at the proteomics core facility of Research Unit for Molecular Medicine, Dept. of Clinical Medicine, Aarhus University Hospital. Based on the analytical uncertainty of the protein analysis methods, 10 samples are sufficient for detecting down to two-fold alterations in protein levels (p<0.05). By using state of the art mass spectrometry, the difference in any protein level between 1) the total urine amount on a wet and a dry night, and 2) first morning voided volume on a wet and a dry night, will be evaluated. Furthermore, difference in urine composition between children with NE and healthy children will be evaluated. Student's t-test with significance level at p<0.05 will be used.The amount of proteins in each urine sample will be correlated to the total amount of proteins in the respective sample.

Official Title
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Biomarkers in Urine for Children With Monosymptomatic Nocturnal Enuresis and Nocturnal Polyuria

Conditions
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Nocturnal Enuresis

Intervention / Treatment
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* Diagnostic Test: Urine collection through a collecting device (Uridome®) for maximum 1 week
* Diagnostic Test: Urine collection


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Monosymptomatic nocturnal enuresis with at least one dry night per week. Nocturnal polyuria defined as nocturnal urine production on wet nights greater than 130 % of expected bladder capacity for age. Normal bladder capacity defined as maximum voided volume excluding first morning voided volume bigger than expected bladder capacity for age. Exclusion Criteria: Recurrent urinary tract infections. Anamnestic, clinical or laboratory findings that can be related to diseases or conditions that might affect the parameters investigated. Neurological and/or known clinically significant anatomical abnormalities of the urinary tract. Former operations in the urinary tract. Ongoing medication that may interfere with the parameters tested. If the child is receiving treatment for nocturnal enuresis (desmopressin, alarm or anticholinergics), the treatment has to be paused 1 week before urine collection. Furthermore, we will include 10 children without nocturnal enuresis and otherwise healthy.

Ages Eligible for Study
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Minimum Age: 6 Years
Maximum Age: 14 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Interventional Model Description: 10 boys with nocturnal enuresis and 10 healthy boys will be included for urine collection.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Urine collection, children with nocturnal enuresis<br>The child ́s weight and height will be registered. The children's urine will be tested for infection with a dipstick urinalysis. The child will be asked to perform home recordings for seven days consisting of measurements of diaper weight and first morning voided volume and a two-day frequency-volume chart. | Diagnostic Test: Urine collection through a collecting device (Uridome®) for maximum 1 week<br>* The child will collect: Urine at bedtime before a wet and a dry night. Urine during a wet night through a collecting device. First morning voided volume following both a wet and a dry night.<br>|
| Active Comparator: Urine collection, healthy children<br>The child ́s weight and height will be registered. The children's urine will be tested for infection with a dipstick urinalysis. | Diagnostic Test: Urine collection<br>* The child will collect: Urine at bedtime. First morning voided volume<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Proteins. | By using mass spectrometry (proteomics). For all children, any proteins related to nocturnal polyuria will be detected. | Up to 1 week. | 
| Metabolites. | By targeted mass spectrometry. | Up to 1 week. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total urine volume in each sample. | A urine volume for the dry night (first morning voided volume) and wet night (nighttime urine production + first morning voided volume) will be calculated. | Up to 1 week. | 
| Concentration of creatinine in the urine samples. | A level for the dry night and wet night will be calculated. | Up to 1 week. | 
| Osmolality in the urine samples. | By freezing-point depression. A level for the dry night and wet night will be calculated. | Up to 1 week. |