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. 2023 Sep;64(5):501-509.
doi: 10.4111/icu.20220377.

First-morning urine osmolality and nocturnal enuresis in children: A single-center prospective cohort study

Gwon Kyeong Lee  1   2 , Jae Min Chung  1   3   4 , Sang Don Lee  1   3   5
Affiliations

First-morning urine osmolality and nocturnal enuresis in children: A single-center prospective cohort study

Gwon Kyeong Lee et al. Investig Clin Urol. 2023 Sep.

Abstract

Purpose: To investigate the treatment outcome of nocturnal enuresis (NE) according to first-morning urine osmolality (Uosm) before treatment.

Materials and methods: Ninety-nine children (mean age, 7.2±2.1 y) with NE were enrolled in this retrospective study and divided into two groups according to first-morning Uosm results, that is, into a low Uosm group (<800 mOsm/L; 38 cases, 38.4%) or a high Uosm group (≥800 mOsm/L; 61 cases, 61.6%). Baseline parameters were obtained from frequency volume charts of at least 2 days, uroflowmetry, post-void residual volume, and a questionnaire for the presence of frequency, urgency, and urinary incontinence. Standard urotherapy and pharmacological treatment were administered initially in all cases. Enuresis frequency and response rates were analyzed at around 1 month and 3 months after treatment initiation.

Results: The level of first-morning Uosm was 997.1±119.6 mOsm/L in high Uosm group and 600.9±155.9 mOsm/L in low Uosm group (p<0.001), and first-morning voided volume (p=0.021) and total voided volume (p=0.019) were significantly greater in the low Uosm group. Furthermore, a significantly higher percentage of children in the low Uosm group had a response rate of ≥50% (CR or PR) at 1 month (50.0% vs. 24.6%; p=0.010) and 3 months (63.2% vs. 36.1%; p=0.009).

Conclusions: Treatment response rates are higher for children with NE with a lower first-morning Uosm.

Keywords: Child; Nocturnal enuresis; Osmolar concentration; Urinalysis; Urinary bladder.

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Conflict of interest statement

The authors have nothing to disclose.

Figures

Fig. 1
Fig. 1. Treatment outcomes according to the frequency of enuresis. (A) All study subjects and children with (B) MSNE or (C) NMSNE. MSNE, monosymptomatic nocturnal enuresis; NMSNE, non-monosymptomatic nocturnal enuresis.
Fig. 2
Fig. 2. Treatment outcomes according to response rates. (A) All study subjects and children with (B) MSNE or (C) NMSNE. MSNE, monosymptomatic nocturnal enuresis; NMSNE, non-monosymptomatic nocturnal enuresis.
See this image and copyright information in PMC

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