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Dan Shen and Lu-Shen-Wan, traditional Chinese medicines used as remedies for heart diseases, demonstrate digoxin-like immunoreactivity. The digoxin-like immunoreactive components of Lu-Shen-Wan show approximately 55% protein binding, while Dan Shen demonstrates concentration-dependent protein binding (68% bound at lower concentrations but only 25% bound at higher concentrations). Because Dan Shen and Lu-Shen-Wan can cause substantial toxic effects in patients, we studied the potential use of Digibind (Fab fragment of polyclonal antidigoxin antibody; Burroughs Wellcome, Research Triangle Park, NC) for neutralizing the pharmacologically active free fractions of Dan Shen and Lu-Shen-Wan. Drug-free serum pools were supplemented with Dan Shen or Lu-Shen-Wan to achieve apparent digoxin concentrations expected in severe overdoses. Aliquots of supplemented serum pools were supplemented further with aqueous Digibind solution to achieve final Digibind concentrations between 5 and 20 microg/mL (expected in vivo range in patients overdosed with digoxin and being treated with Digibind). We observed complete removal of the free apparent digoxin in the presence of Digibind for Dan Shen and Lu-Shen-Wan. Digibind binds free digoxin-like immunoreactive components of Dan Shen and Lu-Shen-Wan in vitro.

american journal of clinical pathology

Neutralization of Free Digoxin-like Immunoreactive Components of Oriental Medicines Dan Shen and Lu-Shen-Wan by the Fab Fragment of Antidigoxin Antibody (Digibind)