This is depicted below, followed by full 12-lead ECG examples of digoxin toxicity, atrial tachycardia with 2:1 block and bidirectional ventricular tachycardia.

Digoxin ECG changes; Premature supraventricular beat (1st complex on ECG) This ECG demonstrates the typical "reverse check" or "reverse tick" sign seen in the setting of digoxin therapy.

Auricular Standstill: An Unusual Effect of Digitalis on the Heart, with Especial Reference to the Electrocardiogram Author : Paul D. White , M.D. Author Info & Affiliations Published August 17, 1916 ...

The child received treatment with 40 mg of digoxin-specific antibody fragments (FAB; a digoxin overdose antidote), and ECG results and blood pressure normalized.