Female preponderance in diuretic-associated hypokalemia: a retrospective study in seven long-term care facilities.

A retrospective review of the medical records of 161 geriatric nursing-home patients receiving diuretics alone or in combination with potassium supplements or potassium sparing-diuretics revealed a 13.7 per cent overall prevalence of hypokalemia. The prevalence of hypokalemia in patients receiving diuretics alone, diuretics with potassium supplements, and potassium-sparing diuretics with kaliuretic diuretics were similar. However, there was a significantly higher prevalence of hypokalemia in women (16.4 per cent) compared with men (3.0 per cent), P less than 0.05. In patients taking non-chloride salts of potassium, there was a significantly higher prevalence of hypokalemia than in those taking the chloride salt (3.6 per cent vs. 8 per cent, P less than 0.025). Seven per cent of patients taking diuretics with potassium supplements and 11.5 per cent of patients taking potassium-sparing diuretics had hyperkalemia. Thus, although many elderly women taking diuretics may have hypokalemia routine potassium supplementation for all non-digitalized geriatric patients receiving diuretics does not seem to be indicated.