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Figure 1 | Journal of Cardiothoracic Surgery

Figure 1

From: Double left ventricular pacing following accidental malpositioning of the right ventricular electrode during implantation of a cardiac resynchronization therapy device

Figure 1

ECC recordings before CRT implantation showed a wide QRS due to LBBB (1 a- b); after CRT implantation simultaneous stimulation of the presumed RV electrode misplaced in the left ventricle and the CS electrode resulted in a narrow QRS and positive R- waves in V1 (1 c- d); after revision of the RV lead simultaneous stimulation in the RV and the CS (1 e- f). Although the ECGs before and after revision show differences, the principle finding of a narrow QRS and a positive R-Wave in V1 is present in both recordings.

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