At the heart of cardiac codes.
D002318:Cardiovascular Diseases / Q000145:classification / Q000175:diagnosis*; D039702:Current Procedural Terminology; D003954:Diagnostic Services / Q000145:classification* / Q000191:economics; D004562:Electrocardiography / Q000145:classification; D005080:Exercise Test / Q000145:classification; D006801:Humans; D038801:International Classification of Diseases; D014481:United States