<prompt> A 10-year old child with Valvular hea disease on hea failure treatment, has the following ECG tracing. What is the diagnosis?Tall tented T waveVentricular bigeminyNon paroxysmal atrial tachycardia with irregular AV blockNon paroxysmal atria tachycardia with regular AV block  <response>: Hea rate of the patient is 50bpm . ECG tracing shows normal sinus rhythm alternating with premature ventricular contraction. This is diagnostic of ventricular bigeminy which is the most common arrhythmia seen with digoxin toxicity. 