case_images: PMC8374168_01
case_images: 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.
case_images: fped-09-691146-g0001.jpg
case_images: PMC8374168_01_fped-09-691146-g0001.jpg
case_images: F1
case_images: 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).
case_images: The electrocardiogram following amiodarone infusion revealed atrioventricular (AV) dissociation (arrow), capture beats (C), and fusion beats (F).
case_images: fped-09-691146-g0002.jpg
case_images: PMC8374168_01_fped-09-691146-g0002.jpg
case_images: F2
case_images: During continuous amiodarone infusion, ECG revealed atrioventricular (AV) dissociation, occasional capture beats, and fusion beats (Figure 2).
case_images: The 12-lead electrocardiogram showed sinus rhythm with a normal QRS duration of 62 ms, and a QRS axis of 72 .
case_images: fped-09-691146-g0003.jpg
case_images: PMC8374168_01_fped-09-691146-g0003.jpg
case_images: F3
case_images: The sinus rhythm with normal AV conduction and narrow QRS duration of 62 ms was achieved 6 h later (Figure 3).