title: Cases from the aerospace medicine residents' teaching file. Case #18. Secondary R' waves on initial electrocardiogram in a commissioned officer.
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D002037:Bundle-Branch Block / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008889:Military Personnel; D014481:United States