title: Underlying rhythm in patients with implanted pacemakers by chest wall stimulation.
mesh_terms: D000328:Adult; D000368:Aged; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D010812:Physical Stimulation; D013909:Thorax