A 40 year old man was admitted to the hospital emergency with sudden onset of the symptoms and signs of severe left ventricular failure. Calculate the atrial rate of the patient.: (A) 100/min, (B) 150/min, (C) 200/min, (D) 300/min
Answer is D. Ventricular rate : 1500/10 = 150 ECG shows HR of 150/min with normal axis. Saw tooth waves are noted with 2:1 AV block. Ventricular rate is 150/min therefore the atrial rate would be 300/min.