Sweat Sodium Levels in Congestive Heart Failure

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Abstract
Sweat Na+ concns. were measured in edematous congestive failure patients and in controls as an index of adrenal electrolyte hormone activity. Fluid and Na+ intake and environmental temp. were relatively constant. Sweat was collected from the back under a plastic jacket. The mean sweat Na+ concn. of 3 of the 4 groups of congestive failure patients did not differ significantly from that of the controls while that of the remaining group was significantly higher. Mercuhydrin did not affect sweat Na+ concn. The wide range of sweat Na+ levels suggests that numerous non-endocrine factors may affect the Na+ concn.