A 37-year-old woman presents with history of palpitations
lasting for over an hour. She is anxious and claims that she
has had similar palpitations several times in the past. Most
of the previous episodes has resolved promptly with Val-
salva maneuver. A 12-lead ECG is shown below.
What is the diagnosis?
A. AVRT
B. AVNRT
C. Atrial tachycardia
D. Atrial flutter with 1:1 conduction
