shock symptoms UMLS_ICD9CM_2005_AUI:A0284197 A cardiovascular system symptom that is characterized as a state of profound depression of the vital processes of the body that is characterized by pallor, rapid but weak pulse, rapid and shallow respiration, reduced total blood volume, and low blood pressure and that is caused usually by severe especially crushing injuries, hemorrhage, burns, or major surgery. UMLS_CUI:C0159051 ICD9CM_2005:785.5 SYMP:0000450 cardiovascular system symptom