Which arrhythmia is commonly caused by digoxin toxicity?

Which arrhythmia is commonly caused by digoxin toxicity?

• A. Atrial Tachycardia
• B. Atrial Fibrillation
• C. Junctional Tachycardia
• D. Accelerated Junctional Rhythm

Answer: (C)

Digoxin toxicity commonly triggers ectopic automaticity in the AV node region, so impulses originate from the AV junction rather than the atria. This produces a junctional tachycardia: a rapid, regular rhythm with narrow QRS complexes. On the ECG you’ll often see little or no visible P waves, or P waves that are inverted and appear after the QRS due to retrograde atrial activation. This pattern fits digoxin toxicity best because the toxic effect promotes AV-junction automaticity, making a tachycardia arise from that junction. Other rhythms like atrial tachycardia or an accelerated junctional rhythm can occur, but they’re not as characteristic of digoxin toxicity; junctional tachycardia is the classic association in this context.