Nonreentrant atrioventricular nodal tachycardia due to triple nodal pathways manifested by radiofrequency ablation at coronary sinus ostium |
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Authors: | Yokoshiki Hisashi Sasaki Koji Shimokawa Junichi Sakurai Masayuki Tsutsui Hiroyuki |
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Affiliation: | aDepartment of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan;bDepartment of Cardiovascular Medicine, Hokko Memorial Hospital, Sapporo 065-0027, Japan |
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Abstract: | We report a case of complex supraventricular tachycardia manifested by radiofrequency delivery. Initially, the patient presented with orthodromic atrioventricular reentrant tachycardia via a left-sided accessory pathway that was successfully eliminated. Atrial tachycardia originating from coronary sinus ostium was also induced. Radiofrequency delivery at the coronary sinus ostium induced a narrow QRS tachycardia with irregular R-R intervals. A detailed analysis explained that the tachycardia could be a nonreentrant mechanism due to triple atrioventricular nodal pathways: an atrial excitation evokes double ventricular response due to simultaneous activation of the fast and slow pathways, and the next one activates ventricle through the intermediate pathway. |
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Keywords: | Triple nodal pathways Nonreentrant atrioventricular nodal tachycardia Double ventricular response Coronary sinus ostium Radiofrequency ablation |
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