Medicine Ibutilide acts by A Blockade of Na+ current B Interference with the action of catecholamines at the b-adrenergic receptor C Delay of repolarization due to inhibition of K+ current D Interference with calcium conductance 💡 Explanation Ibutilide acts by ✓ Correct Answer: B. Interference with the action of catecholamines at the b-adrenergic receptor