cardiovascular system symptom palpitation true ICD9CM_2005:785.1 UMLS_ICD9CM_2005_AUI:A0004066 Palpitations Palpitation is a cardiovascykar system symptom characterized by an abnormal awareness of the beating of the heart,whether it is too slow, too fast, irregular, or at its normal frequency when excited by violent exertion, strong emotion, or disease. abnormal heart beats symptoms SYMP:0000530 SyOID:16497 UMLS_CUI:C0030252