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Estimating the Association Between Outdoor Temperature and Acute Kidney Injury Using Alternative Case Definitions.

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High ambient heat exposure is linked to acute kidney injury (AKI), even in undiagnosed cases. This study highlights the importance of recognizing heat

Keywords:
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Area of Science:

  • Environmental Health
  • Nephrology
  • Epidemiology

Background:

  • Acute kidney injury (AKI) is a significant clinical problem.
  • Ambient heat exposure is a potential environmental risk factor for AKI.
  • Accurate estimation of the association between heat and AKI is challenging due to diagnostic variability.

Purpose of the Study:

  • To refine estimates of the association between ambient heat exposure and community-acquired AKI.
  • To improve case ascertainment for AKI in relation to heat exposure.
  • To compare different case definitions for identifying AKI in heat-related studies.

Main Methods:

  • A case-crossover study design was employed.
  • Data from AKI-related emergency department visits in Atlanta were analyzed.
  • Meteorological data from Daymet were used to assess heat exposure.
  • Seven distinct AKI case definitions were compared.

Main Results:

  • A positive association between higher temperatures and AKI was observed across all case definitions.
  • The strongest association was found for cases with an ICD-coded AKI as a primary diagnosis (OR, 1.15; 95% CI, 1.01-1.31).
  • Significant heat associations were also identified for cases diagnosed using laboratory results but lacking an ICD-coded AKI diagnosis.

Conclusions:

  • A substantial number of AKI cases remain undiagnosed.
  • These undiagnosed AKI cases are significantly associated with ambient heat exposure.
  • Findings underscore the public health impact of heat on kidney health and the need for improved diagnostic strategies.