Hyponatremia and long-term mortality in survivors of acute ST-elevation myocardial infarction

Alexander Goldberg, Haim Hammerman, Sirouch Petcherski, Mithal Nassar, Alexander Zdorovyak, Sergey Yalonetsky, Michael Kapeliovich, Yoram Agmon, Rafael Beyar, Walter Markiewicz, Doron Aronson

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Hyponatremia, a marker of neurohormonal activation, is a common electrolyte disorder among patients with acute ST-elevation myocardial infarction. The long-term prognostic value of hyponatremia during the acute phase of infarction is not known. Methods: We studied 978 patients with acute ST-elevation myocardial infarction and without a history of heart failure who survived the index event. During the hospital stay, sodium levels were obtained on admission and at 24, 48, and 72 hours. The median duration of follow-up after hospital discharge was 31 months (range, 9-61 months). Results: Hyponatremia, defined as a mean serum sodium level less than 136 mEq/L, was present during admission in 108 patients (11.0%). In a multivariable Cox proportional hazards model adjusting for other potential clinical predictors of mortality and for left ventricular ejection fraction, hyponatremia during admission remained an independent predictor of postdischarge death (hazard ratio [HR], 2.0; 95% confidence interval [CI], 1.3-3.2; P=.002). Hyponatremia during admission was also independently associated with postdischarge readmission for heart failure (HR, 1.6; 95% CI, 1.1-2.6; P=.04). When serum sodium level was used as a continuous variable, the adjusted HR for death or heart failure was 1.12 for every 1-mEq/L decrease (95% CI, 1.07-1.18; P

Original languageEnglish (US)
Pages (from-to)781-786
Number of pages6
JournalArchives of Internal Medicine
Volume166
Issue number7
DOIs
StatePublished - Apr 10 2006
Externally publishedYes

ASJC Scopus subject areas

  • Internal Medicine

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