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Vol. 70. Issue 5.
Pages 395 (May 2017)
Vol. 70. Issue 5.
Pages 395 (May 2017)
ECG Contest
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Response to ECG, April 2017
Respuesta al ECG de abril de 2017
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César Rainer Solórzano Guillén, Rafael Peinado Peinado
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rpeinado@secardiologia.es

Corresponding author:
Unidad de Arritmias, Servicio de Cardiología, Hospital Universitario La Paz, Madrid, Spain
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Rev Esp Cardiol. 2017;70:29510.1016/j.rec.2016.11.001
César Rainer Solórzano Guillén, Rafael Peinado Peinado
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The correct response is number 4. The ECG shows a slow rise of the initial upstroke of the QRS complex, with a Q wave>40 ms in lead aVR, a monophasic R wave in lead V1, and an rS pattern in lead V6; together with the patient's disease profile, these findings are strong indicators of monomorphic ventricular tachycardia due to myocardial reentry (response 1, Figure 1).1,2 Moreover, the ECG findings almost certainly exclude nodal reentrant tachycardia with right bundle branch block or monomorphic ventricular tachycardia due to bundle branch reentry (responses 2 and 3).

Figure 1
(0.15MB).

In the ECG, the polarity of the slow rise of the initial upstroke of the QRS complex was positive in leads V1 to V5 and the inferior leads and negative in lead I, a pattern compatible with a preexcited tachycardia via a left lateral accessory pathway (response 4). The sinus rhythm ECG (Figure 2) shows a heartbeat with no initial Q wave in V6 and no initial R wave in V1, indicating the presence of preexcitation.1

Figure 2
(0.14MB).

During electrophysiological analysis, stimulation from the distal coronary sinus reproduced the tachycardia morphology (Figure 3). A 1:1 conduction perimitral atrial flutter equivalent to the clinical tachycardia was induced via a left lateral accessory pathway. Both arrhythmias were successfully ablated.

Figure 3
(0.14MB).
References
[1]
Z. Issa, J. Miller, D. Zipes.
Approach to wide QRS complex tachycardias.
Clinical arrhythmology and electrophysiology, 2.aed., pp. 499-511
[2]
M. Jastrzebski, P. Kukla, D. Czarnecka, K. Kawecka-Jaszcz.
Comparison of five electrocardiographic methods for differentiation of wide QRS-complex tachycardias.
Europace., 14 (2012), pp. 1165-1171
Copyright © 2016. Sociedad Española de Cardiología
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