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A correctable complication of advanced congestive heart failure.

Hyponatremia is a common complication of chronic advanced CHF unresponsive to the usual therapeutic measures. Thus low levels of serum sodium are a significant marker for severe CHF refractory to the more conventional measures. The combined use of ACE inhibitors and diuretics is generally very effective in correcting the hyponatremic state and often helpful in reversing CHF.