Summary: Take Home Points: In the context of poisoning, a “wide QRS” is anything greater than 100 milliseconds. A newly “wide QRS”, especially with hemodynamic instability, should prompt consideration of sodium channel blockade and not ventricular tachycardia. Treatment is guided by administration of sodium-bicarbonate. Recall that the resultant alkalemia driven by sodium-bicarbonate will shift potassium intracellularly. ... Read more
