title: The expansion of tight coils in endocardial pacing electrodes.
mesh_terms: D000368:Aged; D004567:Electrodes, Implanted / Q000009:adverse effects*; D005260:Female; D006327:Heart Block / Q000000981:diagnostic imaging / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects* / Q000295:instrumentation / Q000379:methods; D010369:Pectoralis Muscles; D011183:Postoperative Complications / Q000000981:diagnostic imaging; D011859:Radiography