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Figure 13a. Biventricular pacemaker. Posteroanterior (a) and lateral (b) radiographs of the chest show a biventricular pacemaker placed via the right subclavian vein with one electrode in the right ventricle (arrow) and a second electrode in the coronary sinus–draining vein from the left ventricle (arrowhead). The device paces both cardiac ventricles simultaneously.
