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Vol. 69. Issue 5.
Pages 518 (May 2016)
Vol. 69. Issue 5.
Pages 518 (May 2016)
ECG Contest
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ECG, May 2016
ECG de mayo de 2016
Víctor Bazán
Unidad de Arritmias, Servicio de Cardiología, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
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Rev Esp Cardiol. 2016;69:61010.1016/j.rec.2015.12.019
Víctor Bazán
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A 52-year-old woman with hypertension and no underlying structural heart disease. Past medical history of repeated presyncope associated with emotional stress and one sudden syncope. The first ECG (Figure 1) shows blocked sinus P waves alternating with conducted P waves with a narrow QRS and others with a long PR interval and wide QRS. In the second ECG, performed a few minutes later (Figure 2), in association with increased sinus tachycardia, atrioventricular conduction becomes consistently 1:1 with a long PR and wide QRS. What is causing these changes? (Clinical case courtesy of Dr. Enrique Rodríguez-Font.)

Figure 1
Figure 2

Suggest a solution to this ECG Contest at (only Spanish). The answer will be published in the next issue (June 2016). #RetoECG.

Copyright © 2016. Sociedad Española de Cardiología
Revista Española de Cardiología (English Edition)

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