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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Lack of age-related differences in the clinical presentation of digoxin toxicity.
Archives of Internal Medicine 1992 November
BACKGROUND: Digoxin toxicity occurs most commonly among the elderly. While the clinical syndrome of digoxin toxicity is well understood, how toxic manifestations change with age is not known.
METHODS: We performed secondary analysis of data from a postmarketing surveillance study of patients with life-threatening digoxin toxicity treated with digoxin antibody therapy. Patients receiving long-term maintenance digoxin therapy and aged 55 years or older were divided into four age groups: 55 to 64, 65 to 74, 75 to 84, and 85 years and older (n = 45, 167, 183, and 83, respectively) and compared with regard to presenting manifestations, digoxin dosing, serum potassium and digoxin levels, and renal function.
RESULTS: The prevalence of high-degree atrioventricular block showed an increasing but nonsignificant trend with age (40%, 40%, 42%, and 47%, respectively). Age-related trends in high-degree atrioventricular block were stronger among men than women and even stronger among men with underlying cardiac ischemia. The proportion of subjects with nausea/vomiting as a toxic manifestation did not consistently change with age (42%, 48%, 48%, and 46%, respectively). There were no age-related differences in degree of renal impairment or maintenance dose, but maintenance dose decreased with increasing renal impairment.
CONCLUSIONS: Among patients with life-threatening digoxin toxicity, there is no age-related difference in clinical presentation.
METHODS: We performed secondary analysis of data from a postmarketing surveillance study of patients with life-threatening digoxin toxicity treated with digoxin antibody therapy. Patients receiving long-term maintenance digoxin therapy and aged 55 years or older were divided into four age groups: 55 to 64, 65 to 74, 75 to 84, and 85 years and older (n = 45, 167, 183, and 83, respectively) and compared with regard to presenting manifestations, digoxin dosing, serum potassium and digoxin levels, and renal function.
RESULTS: The prevalence of high-degree atrioventricular block showed an increasing but nonsignificant trend with age (40%, 40%, 42%, and 47%, respectively). Age-related trends in high-degree atrioventricular block were stronger among men than women and even stronger among men with underlying cardiac ischemia. The proportion of subjects with nausea/vomiting as a toxic manifestation did not consistently change with age (42%, 48%, 48%, and 46%, respectively). There were no age-related differences in degree of renal impairment or maintenance dose, but maintenance dose decreased with increasing renal impairment.
CONCLUSIONS: Among patients with life-threatening digoxin toxicity, there is no age-related difference in clinical presentation.
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