Heart Failure Drugs — and Why Potassium Rules Digoxin

A failing ventricle can be helped in only four ways: drain the preload, drop the afterload, slow the rate, or squeeze harder. Every heart failure drug is one of those four moves. Tap a class to see which move it makes — then switch to Digoxin & potassium and drag the sliders, because the same drug at the same dose becomes poison when the potassium falls.