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Diagnosing the pathophysiologic mechanisms of nocturnal polyuria.
Eur Urol. 2015 Feb; 67(2):283-8.EU

Abstract

BACKGROUND

Diagnosis of nocturnal polyuria (NP) is based on a bladder diary. Addition of a renal function profile (RFP) for analysis of concentrating and solute-conserving capacity allows differentiation of NP pathophysiology and could facilitate individualized treatment.

OBJECTIVE

To map circadian rhythms of water and solute diuresis by comparing participants with and without NP.

DESIGN, SETTING, AND PARTICIPANTS

This prospective observational study was carried out in Ghent University Hospital between 2011 and 2013. Participants with and without NP completed a 72-h bladder dairy. RFP, free water clearance (FWC), and creatinine, solute, sodium, and urea clearance were measured for all participants.

RESULTS

The study participants were divided into those with (n=77) and those without (n=35) NP. The mean age was 57 yr (SD 16 yr) and 41% of the participants were female. Compared to participants without NP, the NP group exhibited a higher diuresis rate throughout the night (p=0.015); higher FWC (p=0.013) and lower osmolality (p=0.030) at the start of the night; and persistently higher sodium clearance during the night (p<0.001). The pathophysiologic mechanism of NP was identified as water diuresis alone in 22%, sodium diuresis alone in 19%, and a combination of water and sodium diuresis in 47% of the NP group.

CONCLUSION

RFP measurement in first-line NP screening to discriminate between water and solute diuresis as pathophysiologic mechanisms complements the bladder diary and could facilitate optimal individualized treatment of patients with NP.

PATIENT SUMMARY

We evaluated eight urine samples collected over 24h to detect the underlying problem in NP. We found that NP can be attributed to water or sodium diuresis or a combination of both. This urinalysis can be used to adapt treatment according to the underlying mechanism in patients with bothersome consequences of NP, such as nocturia and urinary incontinence.

Authors+Show Affiliations

Urology Department, Ghent University Hospital, Ghent, Belgium. Electronic address: an-sofie.goessaert@uzgent.be.Faculty of Medicine, Ghent University, Ghent, Belgium.Urology Department, Ghent University Hospital, Ghent, Belgium.Pediatric Nephrology Department, Ghent University Hospital, Ghent, Belgium.Urology Department, Ghent University Hospital, Ghent, Belgium.

Pub Type(s)

Journal Article
Observational Study

Language

eng

PubMed ID

25240972

Citation

Goessaert, An-Sofie, et al. "Diagnosing the Pathophysiologic Mechanisms of Nocturnal Polyuria." European Urology, vol. 67, no. 2, 2015, pp. 283-8.
Goessaert AS, Krott L, Hoebeke P, et al. Diagnosing the pathophysiologic mechanisms of nocturnal polyuria. Eur Urol. 2015;67(2):283-8.
Goessaert, A. S., Krott, L., Hoebeke, P., Vande Walle, J., & Everaert, K. (2015). Diagnosing the pathophysiologic mechanisms of nocturnal polyuria. European Urology, 67(2), 283-8. https://doi.org/10.1016/j.eururo.2014.09.003
Goessaert AS, et al. Diagnosing the Pathophysiologic Mechanisms of Nocturnal Polyuria. Eur Urol. 2015;67(2):283-8. PubMed PMID: 25240972.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Diagnosing the pathophysiologic mechanisms of nocturnal polyuria. AU - Goessaert,An-Sofie, AU - Krott,Louise, AU - Hoebeke,Piet, AU - Vande Walle,Johan, AU - Everaert,Karel, Y1 - 2014/09/18/ PY - 2014/06/12/received PY - 2014/09/02/accepted PY - 2014/9/22/entrez PY - 2014/9/23/pubmed PY - 2015/12/19/medline KW - Circadian rhythms KW - Nocturnal polyuria KW - Renal function profile KW - Sodium diuresis KW - Water diuresis SP - 283 EP - 8 JF - European urology JO - Eur. Urol. VL - 67 IS - 2 N2 - BACKGROUND: Diagnosis of nocturnal polyuria (NP) is based on a bladder diary. Addition of a renal function profile (RFP) for analysis of concentrating and solute-conserving capacity allows differentiation of NP pathophysiology and could facilitate individualized treatment. OBJECTIVE: To map circadian rhythms of water and solute diuresis by comparing participants with and without NP. DESIGN, SETTING, AND PARTICIPANTS: This prospective observational study was carried out in Ghent University Hospital between 2011 and 2013. Participants with and without NP completed a 72-h bladder dairy. RFP, free water clearance (FWC), and creatinine, solute, sodium, and urea clearance were measured for all participants. RESULTS: The study participants were divided into those with (n=77) and those without (n=35) NP. The mean age was 57 yr (SD 16 yr) and 41% of the participants were female. Compared to participants without NP, the NP group exhibited a higher diuresis rate throughout the night (p=0.015); higher FWC (p=0.013) and lower osmolality (p=0.030) at the start of the night; and persistently higher sodium clearance during the night (p<0.001). The pathophysiologic mechanism of NP was identified as water diuresis alone in 22%, sodium diuresis alone in 19%, and a combination of water and sodium diuresis in 47% of the NP group. CONCLUSION: RFP measurement in first-line NP screening to discriminate between water and solute diuresis as pathophysiologic mechanisms complements the bladder diary and could facilitate optimal individualized treatment of patients with NP. PATIENT SUMMARY: We evaluated eight urine samples collected over 24h to detect the underlying problem in NP. We found that NP can be attributed to water or sodium diuresis or a combination of both. This urinalysis can be used to adapt treatment according to the underlying mechanism in patients with bothersome consequences of NP, such as nocturia and urinary incontinence. SN - 1873-7560 UR - https://www.unboundmedicine.com/medline/citation/25240972/Diagnosing_the_pathophysiologic_mechanisms_of_nocturnal_polyuria_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0302-2838(14)00888-4 DB - PRIME DP - Unbound Medicine ER -