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  • Title: Reversal of advanced digoxin intoxication with Fab fragments of digoxin-specific antibodies.
    Author: Smith TW, Haber E, Yeatman L, Butler VP.
    Journal: N Engl J Med; 1976 Apr 08; 294(15):797-800. PubMed ID: 943040.
    Abstract:
    Purified Fab fragments of ovine digoxin-specific antibodies reversed severe digoxin intoxication in a patient who had taken 22.5 mg of the drug with suicidal intent. Atrioventricular block with extreme bradycardia was temporarily managed by pacing, but progressive, intractable hyperkalemia (serum potassium of 8.7 meq per liter) with increasing pacing threshold and progressive intraventricular conduction delay was controlled only after infusion of 1100 mg of Fab. Sinus rhythm returned 10 minutes after completion of Fab infusion. Within five hours, the serum potassium concentration fell to 4.0 meq per liter. Free digoxin concentrations in serum fell sharply to undetectable levels, whereas total serum digoxin concentration concomitantly increased 12-fold. Renal excretion of digoxin bound to Fab was documented. Reversal of toxicity was not accompanied by hemodynamic instability, and antibodies to sheep Fab fragments were not detected in the patient's serum after treatment. Thus, purified digoxin-specific Fab fragments are capable of rapid reversal of advanced digoxin toxicity.
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