Digoxin helps symptoms but does not improve survival, has a narrow therapeutic index, and its toxicity (yellow-green halos, nausea, bradycardia, arrhythmia) is made worse by electrolyte disturbances. Digoxin immune Fab reverses it. What these do and do not ask. Indications, adverse effects, contraindications and patient education are in, weighted above mechanism. Doses are out, and so is the digoxin target level, which is why the sets run shorter than the usual 30. Every option carries its own reason, correct and incorrect alike.
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