A 30-year-old man presents with recurrent attacks of feeling dizzy. ECG was done. What is the diagnosis?: (A) Atrial fibrillation, (B) PSVT, (C) Mobitz I hea block, (D) Complete hea block
Answer is C. HR is regularly irregular due to change in rhythm. Axis is normal. Progressive lengthening of PR interval followed by dropped beat is seen. PR interval before the dropped beat is more than PR interval in subsequent beats. Dx: Mobitz I hea block.