PMC8374168_01
The initial 12-lead electrocardiogram showed regular tachycardia with a heart rate of 210 bpm, a slightly wide QRS duration of 72 ms, a superior QRS axis of 223 , and a right bundle branch block (RBBB) pattern. Reverse P' waves (arrow) were identified in lead aVF, indicating the presence of 1:1 ventriculoatrial (VA) retrograde conduction.
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F1
A 12-lead electrocardiogram (ECG) demonstrated a regular tachycardia with a heart rate of 210 beats per minute (bpm), a slightly wide QRS duration of 72 ms, a superior QRS axis of 223 , and a right bundle branch block pattern (RBBB) (Figure 1).
The electrocardiogram following amiodarone infusion revealed atrioventricular (AV) dissociation (arrow), capture beats (C), and fusion beats (F).
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F2
During continuous amiodarone infusion, ECG revealed atrioventricular (AV) dissociation, occasional capture beats, and fusion beats (Figure 2).
The 12-lead electrocardiogram showed sinus rhythm with a normal QRS duration of 62 ms, and a QRS axis of 72 .
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F3
The sinus rhythm with normal AV conduction and narrow QRS duration of 62 ms was achieved 6 h later (Figure 3).