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Association of low birth weight and prematurity with clinical outcomes of childhood nephrotic syndrome: a prospective cohort study

  • Natalia Konstantelos
  • Tonny Banh
  • Viral Patel
  • Jovanka Vasilevska-Ristovska
  • Karlota Borges
  • Neesha Hussain-Shamsy
  • Damien Noone
  • Diane Hebert
  • Seetha Radhakrishnan
  • Christoph P.B. Licht
  • Valerie Langlois
  • Rachel J. Pearl
  • Rulan S. ParekhEmail author
Original Article

Abstract

Background

Low birth weight (LBW)/prematurity have been proposed as risk factors for the development of kidney disease in adulthood. Whether there is an association between LBW/prematurity and poor renal outcomes in childhood onset nephrotic syndrome remains unknown.

Methods

Children with nephrotic syndrome diagnosed between 1 and 18 years of age were followed prospectively from 1996 to 2016 at The Hospital for Sick Children (N = 377). LBW/prematurity was defined as birth weight < 2500 g or gestational age < 36 weeks. Normal birth weight (NBW) was defined as birth weight ≥ 2500 g. Measures evaluating clinical course of nephrotic syndrome include initial steroid-resistant nephrotic syndrome (SRNS), time to first relapse, and frequently relapsing nephrotic syndrome. Kaplan-Meier survival analysis, logistic regression, and Cox proportional hazards regression were used to determine the association of LBW/prematurity with clinical outcomes.

Results

Median birth weights in LBW/premature (n = 46) and NBW (n = 331) children were 2098 g (interquartile range [IQR] 1700–2325 g) and 3317 g (IQR 2977–3685 g), respectively. Odds of having SRNS were 3.78 (95% confidence interval [CI] 1.28–11.21) times higher among LBW/premature children than NBW children. An 8% decrease in odds of developing SRNS was observed for every 100 g increase in birth weight (adjusted odds ratio [OR] 0.92; 95% CI 0.86–0.98). Median time to first relapse did not differ (hazard ratio [HR] 0.89; 95% CI 0.53–1.16).

Conclusions

LBW/premature children were more likely to develop SRNS but did not have a difference in time to first relapse with NBW children. Understanding the impact and mechanism of birth weight and steroid-resistant disease needs further study.

Keywords

Nephrotic syndrome Low birth weight Prematurity Steroid resistant nephrotic syndrome Time to first relapse 

Notes

Acknowledgements

We thank the participants and their families for their time and effort, as well as the nurses and staff from the Nephrology Clinic at the Hospital for Sick Children and William Osler Health System—Brampton Civic Hospital and Peel Memorial Centre. We also thank Richard Child for his advice and insight into the electronic patient record.

Authors’ contributions

Research idea and study design: RP; CPBL DN, DH; SR; RJP; and VL; data acquisition: VP, TB, NHS, JVR, and KB; manuscript drafting: NK; statistical analysis: NK and TB; figure preparation: NK and TB; supervision: RP. Each author contributed important intellectual content during manuscript revision and accepts accountability for the overall work by ensuring that questions pertaining to the accuracy and integrity of any portion of the work are appropriately investigated and resolved.

Funding

This study was funded by the Hospital for Sick Children Research Institute and Physicians’ Services Incorporated.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.

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Copyright information

© IPNA 2019

Authors and Affiliations

  • Natalia Konstantelos
    • 1
    • 2
  • Tonny Banh
    • 1
  • Viral Patel
    • 2
  • Jovanka Vasilevska-Ristovska
    • 1
  • Karlota Borges
    • 1
  • Neesha Hussain-Shamsy
    • 2
  • Damien Noone
    • 2
    • 3
  • Diane Hebert
    • 2
    • 3
  • Seetha Radhakrishnan
    • 2
    • 3
  • Christoph P.B. Licht
    • 2
    • 3
  • Valerie Langlois
    • 2
    • 3
  • Rachel J. Pearl
    • 2
    • 3
    • 5
  • Rulan S. Parekh
    • 1
    • 2
    • 3
    • 4
    • 6
    Email author
  1. 1.Child Health Evaluative Sciences, Research InstituteHospital for Sick ChildrenTorontoCanada
  2. 2.University of TorontoTorontoCanada
  3. 3.Division of Nephrology, Hospital for Sick Children555 University AveTorontoCanada
  4. 4.University Health NetworkTorontoCanada
  5. 5.Department of PediatricsWilliam Osler Health SystemEtobicokeCanada
  6. 6.Dalla Lana School of Public HealthUniversity of TorontoTorontoCanada

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