Abstract
Background
To develop a pediatric-specific hypertension algorithm using administrative data and use it to evaluate the association between acute kidney injury (AKI) in the intensive care unit (ICU) and hypertension diagnosis 5 years post-discharge.
Methods
Two-center retrospective cohort study of children (≤ 18 years old) admitted to the pediatric ICU in Montreal, Canada, between 2003 and 2005 and followed until 2010. Patients with a valid healthcare number and without end-stage renal disease were included. Patients who could not be merged with the provincial database, did not survive admission, underwent cardiac surgery, had pre-existing renal disease associated with hypertension or a prior diagnosis of hypertension were excluded. AKI defined using the Kidney Disease: Improving Global Outcomes (KDIGO) definition. Using diagnostic codes and medications from administrative data, novel pediatric-specific hypertension definitions were designed. Both the evaluation of the prevalence of hypertension diagnosis and the association between AKI and hypertension occurred.
Results
Nineteen hundred and seventy eight patients were included (median age at admission [interquartile range] 4.3 years [1.1–11.8], 44% female, 325 (16.4%) developed AKI). Of these patients, 130 (7%) had a hypertension diagnosis 5 years after discharge. Patients with AKI had a higher prevalence of hypertension diagnosis [non-AKI: 84/1653 (5.1%) vs. AKI: 46/325 (14.2%), p < .001]. Children with AKI had a higher adjusted risk of hypertension diagnosis (hazard ratio [95% confidence interval] 2.19 [1.47–3.26]).
Conclusions
Children admitted to the ICU have a high prevalence of hypertension post-discharge and children with AKI have over two times higher risk of hypertension compared to those with no AKI.
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Acknowledgments
We acknowledge the individuals who performed the data collection and helped with data management at Hospital Sainte Justine and the Montreal Children’s Hospital. We acknowledge Vedran Cockovski, for helping with manuscript preparation and submission. Michael Zappitelli received research support from Fonds de Recherche du Québec Santé, which allowed him to perform this work.
Funding
All phases of this study were supported by Fonds de Recherche du Québec—Santé (FRQS) (grant number 22888 [to MZ]). MZ was supported by a research salary award and EH by a graduate studies award from the FRQS.
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Approvals from institutional research ethics boards from both centres and the Commission d’accès à l’information du Québec (CAI, provincial ethics body) were obtained.
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The authors have no conflicts of interest to declare. Funding was given by a government grant agency that had no involvement in study design, collection, analysis, and interpretation of data, manuscript writing, or submission. EH wrote the initial draft of the manuscript and did not receive an honorarium, grant, or other form of payment to produce the manuscript.
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Hessey, E., Perreault, S., Roy, L. et al. Acute kidney injury in critically ill children and 5-year hypertension. Pediatr Nephrol 35, 1097–1107 (2020). https://doi.org/10.1007/s00467-020-04488-5
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DOI: https://doi.org/10.1007/s00467-020-04488-5