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Serum digoxin and empiric methods in identification of digitoxicity

A prospective study of consecutive patients admitted to a medical service was undertaken to evaluate the prevalence of cardiac digitalis toxicity and the relative diagnostic values of serum digoxin versus an empiric method, based on calculations of digoxin dose in relation to kidney function and body weight. Of 711 patients admitted, 109 were treated with digitalis on admission. Sixteen of the patients developed cardiac arrhythmias consistent with digitalis intoxication. Five of these, none with serum digoxin above 1.6 ng/ml, were not toxic. The remaining eleven patients, all with serum digoxin levels above 1.6 ng/ml, were either definitely or possibly toxic. A similar borderline between intoxicated and nonintoxicated patients could not be established on the basis of calculations based on body weight and renal function. In all eases in which suspicion of digitalis intoxication was raised, serum digoxin measurements could discriminate between the toxic and the nontoxic patients.