cardiovascular system symptom palpitation ICD9CM_2005:785.1 abnormal heart beats symptoms SYMP:0000530 UMLS_ICD9CM_2005_AUI:A0004066 UMLS_CUI:C0030252 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.