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Vol. 71. Issue 11.
Pages 975 (November 2018)
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Vol. 71. Issue 11.
Pages 975 (November 2018)
ECG Contest
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Response to ECG, October 2018
Respuesta al ECG de octubre de 2018
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Moisés Rodríguez-Mañero
Corresponding author
moirmanero@gmail.com

Corresponding author:
, Laila González-Melchor, Xesús Alberte Fernández López
Unidad de Arritmias, Servizo de Cardioloxía, Complexo Hospitalario Universitario de Santiago de Compostela (CHUS), Santiago de Compostela, A Coruña, Spain
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Rev Esp Cardiol. 2018;71:85910.1016/j.rec.2018.02.018
Moisés Rodríguez-Mañero, Laila González-Melchor, Xesús Alberte Fernández López
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The electrocardiogram of the tachycardia (Figure 1A) shows left bundle branch block morphology and an inferior axis, with a QRS width > 160 ms. It also shows a Q wave in the aVR lead > 40 ms. These observations point to ventricular tachycardia (VT). The RS interval of 95 ms is at the limit of normal. Figure 1B shows an intraventricular conduction disorder (IVCD) in sinus rhythm.

Figure 1
(0.35MB).

As can be seen in Figure 2A, the morphology of tachycardia is reproduced with change in the QRS morphology during an atrial pacing train, indicating aberrantly conducted supraventricular tachycardia (response 2, correct). With the extrastimuli test, nodular re-entry tachycardia was induced (simultaneous VA, indicated with an asterisk in Figure 2B), with a return cycle from the apex to the right ventricle of 177ms (Figure 2C).

Figure 2
(0.11MB).

Datino et al.1 showed by atrial pacing that the specificity of classic VT criteria decreases considerably in the case of IVCD (consequently answers 1 and 3 are incorrect). In these cases, the R wave peak time in lead II ≥ 50 ms (45 ms in this case; Figure 2D) and the absence of RS complexes in precordial leads have high specificity and sensitivity for diagnosis of VT (0.97 and 0.88, respectively).

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Reference
[1]
T. Datino, J. Almendral, P. Avila, et al.
Specificity of electrocardiographic criteria for the differential diagnosis of wide QRS complex tachycardia in patients with intraventricular conduction defect.
Heart Rhythm., 10 (2013), pp. 1393-1401
Copyright © 2018. Sociedad Española de Cardiología
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