title: Long-term evaluation in large dogs and sheep of a series of new fixed-rate and ventricular synchronous pacemakers.
mesh_terms: D000818:Animals; D006328:Cardiac Catheterization; D004285:Dogs; D004562:Electrocardiography; D004567:Electrodes, Implanted; D005069:Evaluation Studies as Topic; D010138:Pacemaker, Artificial / Q000009:adverse effects; D012756:Sheep; D013927:Thrombosis / Q000209:etiology; D013997:Time Factors; D014680:Veins