A supraventricular tachycardia showing alternation of the QRS interval.
Department of Cardiology, Groene Hart Ziekenhuis, Bleulandweg 10, 2803 HH, Gouda, the Netherlands, r.j.van_bommel@lumc.nl.
R J
RJ
van Bommel
E G
EG
Weijers
H J
HJ
Wellens