Complications developed in four patients with heart block managed by permanent transvenous cardiac pacemaking; the complications were penetration and perforation of the right ventricle, fracture of the catheter electrode, and pacemaker-induced ventricular tachycardia-fibrillation. Analysis of these problems led to recommendations for improvement in this method of pacing.
Jensen NK, Schmidt WR, Garamella JJ, Lynch MF, Peterson CA. Intracavitary Cardiac Pacing. JAMA. 1966;195(11):916-918. doi:10.1001/jama.1966.03100110084022