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Kaplan–Meier survival curves demonstrating postdischarge survival among hospital survivors (n=8662) as a function of the presence of hyponatremia (minimum sodium <135) or hypernatremia (maximum sodium ≥145) on (A) cardiac intensive care unit (CICU) admission or (B) during the CICU stay. P<0.001 by log‐rank for all groups compared with patients with normal sodium and P>0.1 for other groups compared with each other.
