title: Narrow QRS Tachycardia in a Patient with Tachycardiomyopathy: What Is the Mechanism?
abstract: A 50-year-old female presented with incessant palpitation of 2 weeks duration. She was hemodynamically stable and there was no evidence of heart failure. A transthoracic echocardiogram showed mild left ventricular (LV) dysfunction with LV ejection fraction of 45%. Electrocardiogram (12 lead and rhythm strip) was taken during the palpitation. What is the mechanism?
authors.affiliation: Department of Cardiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
authors.forename: Krishna Kumar
authors.initials: KK
authors.lastname: Mohanan Nair
authors.affiliation: Department of Cardiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
authors.forename: Narayanan
authors.initials: N
authors.lastname: Namboodiri
authors.affiliation: Division of Cardiology, Electrophysiology and Pacing, Arrhythmia Services, Hamilton Health Sciences, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Syamkumar
authors.initials: S
authors.lastname: Divakaramenon
authors.affiliation: Department of Cardiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
authors.forename: Bharatraj
authors.initials: B
authors.lastname: Banavalikar
authors.affiliation: Department of Cardiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
authors.forename: Sreevilasam Pushpangadhan
authors.initials: SP
authors.lastname: Abhilash
authors.affiliation: Department of Cardiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
authors.forename: Anees
authors.initials: A
authors.lastname: Thajudeen
authors.affiliation: Department of Cardiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
authors.forename: Ajitkumar
authors.initials: A
authors.lastname: Valaparambil
mesh_terms: D058606:Accessory Atrioventricular Bundle / Q000150:complications* / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000150:complications* / Q000175:diagnosis*
keywords: AVRT; atrial ectopic; dual-AV node physiology; left-sided accessory pathway; narrow QRS tachycardia