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European Journal of Epidemiology

, Volume 25, Issue 7, pp 517–524 | Cite as

The 2003 heat wave in France: hydratation status changes in older inpatients

  • Adrien Kettaneh
  • Laurence Fardet
  • Nathalie Mario
  • Aurelia Retbi
  • Namik Taright
  • Kiet Tiev
  • Ingrid Reinhard
  • Bertrand Guidet
  • Jean Cabane
GERIATRICS

Abstract

Little is known about the impact of behavioral changes after the 2003 heat wave on hydration status of elderly citizens in France. We used an administrative data file provided information about 23,022 inpatients aged ≥70 years admitted between 2000 and 2006, including vital status at discharge and Charlson comorbidity index and matched it with the result of five blood tests (sodium, potassium, glucose, urea nitrogen, creatinine) within the first 24 h after admission and with daily temperatures before admission. We then measured the prevalence of plasma tonicity (PT) <275 mOsm/l or >300 mOsm/l, blood urea nitrogen/creatinine ratio (BUNC) >100 and inhospital mortality. In 2000–2002, 2003, 2004–2006, prevalence (%) was, respectively 7.5, 8.0, 9.5 (P < 0.0001) for PT < 275 mMol/l, 8.4, 10.4, 7.2 (P < 0.0001) for PT > 300 mOsm/l, and 35.4, 30.7, 26.7 (P < 0.0001) for BUNC > 100. Inhospital mortality rate was 10.8, 10.8 and 9.0%, respectively (P < 0.0001). After adjustment for covariates, OR (95% CI) in 2004–2006 with reference to 2000–2002 was 1.26 (1.13–1.39) for PT < 275 mMol/l, 0.85 (0.76–0.94) for PT > 300 mOsm/l, and 0.65 (0.61–0.69) for BUNC > 100. Inhospital mortality risk associated with hydration disorders did not vary significantly over periods for PT < 275 mMol/l (HR 1.06 to 1.40) and PT > 300 mOsm/l (HR 1.76 to 1.96) but was lower for BUNC > 100 in 2003 (HR 1.27) than in 2000–2002 (HR 1.64) or 2004–2006 (HR 1.77) (P = 0.04). So, since the 2003 heat wave, significant shifts in prevalence of intracellular hydration disorders indicate behavioral changes with positive impact on hydration status.

Keywords

Heat wave Hydration status 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Adrien Kettaneh
    • 1
    • 6
  • Laurence Fardet
    • 1
    • 6
  • Nathalie Mario
    • 2
    • 6
  • Aurelia Retbi
    • 3
    • 6
  • Namik Taright
    • 3
    • 6
  • Kiet Tiev
    • 1
    • 6
  • Ingrid Reinhard
    • 4
    • 6
  • Bertrand Guidet
    • 5
    • 6
  • Jean Cabane
    • 1
  1. 1.Department of Internal MedicineHôpital Saint-Antoine, Assistance Publique/Hôpitaux de ParisParis cedex 12France
  2. 2.Department of BiochemistryHôpital Saint-Antoine, Assistance Publique/Hôpitaux de ParisParis cedex 12France
  3. 3.Department of Medical InformationHôpital Saint-Antoine, Assistance Publique/Hôpitaux de ParisParis cedex 12France
  4. 4.Department of EmergenciesHôpital Saint-Antoine, Assistance Publique/Hôpitaux de ParisParis cedex 12France
  5. 5.Department of Intensive CareHôpital Saint-Antoine, Assistance Publique/Hôpitaux de ParisParis cedex 12France
  6. 6.Université Pierre et Marie CurieParis 6France

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