(A) Delayed afterdepolarization(DAD): elevated cytosolic calcium concentrations, classically seen with digoxin toxicity (B) 正確 : Early afterdepolarization(EAD)主要之原因為動作電位間期(action potential duration)過長 (C) Torsades des pointes 之主要原因為 Early afterdepolarization (D) 細胞外鉀離子過低(hypokalemia),易引起 early afterdepolarization