A 27-year-old patient with episodes of syncope and short episodes of documented tachycardia.
What is the possible cause of syncope?
1. Scar-related ventricular tachycardia
2. Atrial flutter with 1:1 conduction
3. Pre-excited atrial fibrillation
4. Antidromic AVRT
Figure 1. Electrocardiogram tracings
Ayan Abdrakhmanov, Zhandos Esilbayev
Department of Interventional Arrhythmology
National Research Cardiac Surgery Center
Authorship: A.A. and Z.E. equally contrıbuted to preparation of quiz
Conflict of interest: None to declare
Acknowledgement and funding: None to declare