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Vol. 72. Issue 9.
Pages 778 (September 2019)
ECG Contest
DOI: 10.1016/j.rec.2018.08.017
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Response to ECG, August 2019
Respuesta al ECG de agosto de 2019
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Sofía Calero-Núñez
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sofia.caleron@gmail.com

Corresponding author:
, Víctor M. Hidalgo-Olivares, Jesús Fernando García-Sacristán Fernández
Unidad de Electrofisiología y Estimulación Cardiaca, Servicio de Cardiología, Complejo Hospitalario Universitario de Albacete, Albacete, Spain
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Rev Esp Cardiol. 2019;72:67510.1016/j.rec.2018.08.016
Sofía Calero-Núñez, Víctor M. Hidalgo-Olivares, Jesús Fernando García-Sacristán Fernández
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The ECG shows a tachycardia with a long RP interval (RP >PR) and negative P waves in the inferior leads and positive P waves in leads I and aVL. The differential diagnosis of long RP tachycardias includes orthodromic tachycardia with an accessory pathway, atrial tachycardia (AT), and atypical atrioventricular nodal reentry tachycardia (aAVNRT), but not typical AVNRT, characterized by short RP interval (RP< PR), and so option 2 is incorrect.1 Sinus tachycardia (option 4) can be ruled out because a positive P wave would be present in the inferior leads. AT is a possibility, but when this originates in the superior pulmonary vein, a positive P wave is usually present in leads II, III, and avF (option 1, incorrect).

The correct response is option 3. An electrophysiological study confirmed the participation of a left posterolateral AP with decremental conduction in the tachycardia mechanism, given that the tachycardia terminated with ventricular extrasystole and the His bundle was refractory and without atrial activation (Figure 1).2 The tachycardia resolved with radiofrequency application at the AP site.

Figure 1
(0.31MB).
References
[1]
M.E. Josephson.
Patient with long RP tachycardia.
Card Electrophysiol Clin., 2 (2010), pp. 187-190
[2]
J. Jiménez-Díaz, M.A. González-Marín, J.J. González-Ferrer, F. Higuera-Sobrino, R.P. Long.
interval tachycardia. What is the mechanism?.
J Arrhythm., 33 (2017), pp. 242-244
Copyright © 2018. Sociedad Española de Cardiología
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