Female, 44 years, complains on feeling of palpitations and interruptions in the heart work. Several months ago patient suffered from acute myocarditis. Fragment of electrocardiogram (ECG) was recorded using 12 leads Holter monitor during sleep time, speed of the recording – 25 mm/s (Fig. 1).
The best way to describe these ECG changes is:
A) Supraventricular tachycardia
B) Sinus rhythm with first-degree atrioventricular block
C) Accelerated junctional rhythm
D) Atrial flutter with 2:1 conduction
Figure 1. A 12-lead Holter monitoring fragment.