No abstract available.
Tachycardia*

No abstract available.
Tachycardia*

No abstract available.
Tachycardia, Supraventricular* ; Tachycardia, Ventricular*

The P wave during orthodromic atrioventricular reentry tachycardial were analysed in 19 patients to evaluate the usefulness in identifying the location of accessory pathways. The results were as follows; 1) Definitely inverted and upright P waves in lead I represented the left-sided and right-sided pathways respectively, but the converse is not necessarily true. 2) Dome and Dart appearance in lead VI(4 cases), upright P wave in inferior leads(3 cases), and negative P wave in aVL(3 cases) suggested the left-sided pathway and deeply inverted P waves in inferior leads suggested the posteroseptal or right-sided one. 3) In 17 cases(79%), inverted P wave appeared on more than one lead among the inferior leads, which were helpful to identify the position on P wave and mechanism of supraventricular tachycardia. Although the number of cases especially with right-sided pathway was small to conclude, P wave was useful for determining the location of accessory pathway noninvasively.
Humans ; Tachycardia* ; Tachycardia, Supraventricular

BACKGROUND AND OBJECTIVES: Identifying the critical isthmus of slow conduction is crucial for successful treatment of scar-related ventricular tachycardia. Current 3D mapping is not designed for tracking the critical isthmus and may lead to a risk of extensive ablation. We edited the algorithm to track the delayed potential in order to visualize the isthmus and compared the edited map with a conventional map. SUBJECTS AND METHODS: We marked every point that showed delayed potential with blue color. After substrate mapping, we edited to reset the annotation from true ventricular potential to delayed potential and then changed the window of interest from the conventional zone (early, 50-60%; late, 40-50% from peak of QRS) to the edited zone (early, 80-90%; late, 10-20%) for every blue point. Finally, we compared the propagation maps before and after editing. RESULTS: We analyzed five scar-related ventricular tachycardia cases. In the propagation maps, the resetting map showed the critical isthmus and entrance and exit sites of tachycardia that showed figure 8 reentry. However, conventional maps only showed the earliest ventricular activation sites and searched for focal tachycardia. All of the tachycardia cases were terminated by ablating the area around the isthmus. CONCLUSION: Identifying the channel and direction of the critical isthmus by a new editing method to track delayed potential is essential in scar-related tachycardia.
Tachycardia ; Tachycardia, Ventricular*

The delivery of single His-refractory ventricular extra-stimulus during supraventricular tachycardia is useful to identify the mechanism of the tachycardia. We present the different responses based on the ventricular extra-stimulus site. Our findings demonstrate that the atrial activation via an accessory pathway was not advanced based on the ventricular pacing site. Therefore, atrioventricular tachycardia could masquerade as atrioventricular nodal reentrant tachycardia.
Tachycardia ; Tachycardia, Atrioventricular Nodal Reentry ; Tachycardia, Supraventricular*

No abstract available.
Tachycardia, Supraventricular*

No abstract available.
Tachycardia, Supraventricular*

No abstract available.
Diagnosis, Differential* ; Tachycardia* ; Tachycardia, Supraventricular*

Study 62 patients (mean age 47.2 years) who had paroxysmal supraventricular tachycardia. Risk factors was exert (46.7%), 49.9% of patients had mitral and aorta valve diseases. Most severe symptoms were syncope, hypotension, and seizure (46.6%). Mean rhythm was 18512 cycle/minute, with common disorders were atrial fibrillation and sinus rhythm (62.9%).
Tachycardia, Supraventricular ; Tachycardia ; Risk Factors