exploration on the relationship between pathogenesis for yindeficiency of acute myocardial infarction and immediate prognosis as well as its mechanism objective to study the relationship between pathogenesis for yindeficiency of acute myocardial infarction ami and immediate prognosis as well as its neuroendocrine mechanismmethods according to the tcm standard of syndrome differentiation of deficiency syndrome 194 patients with ami were classified into the typical yindeficiency group n 26 the nontypical yindeficiency group n 61 and the nonyindeficiency group n 107 their venous blood samples were collected in the morning while lying on their backs to detect plasma levels of adrenaline noradrenaline aldosterone atrial natriuretic peptide anp corticoid and myocardial enzymes as well as their hospitalization days and mortality in hospitalized period were calculated and compared in the three groups with the 30 healthy persons as controlresults levels of serum creatine phosphokinase creatine phosphokinase isozyme plasma adrenaline noradrenaline aldosterone hospitalization days and mortality were higher in the yindeficiency groups than in the nonyindeficiency group p 005 p 001 as compared the indexes between the typical and the nontypical yindeficiency groups significant difference only showed in plasma aldosterone and anp which was significantly higher in the former p 005 p 001 plasma corticoid level was insignificantly different between the yindeficieny groupsconclusion patients with ami of yindeficiency type was severer in myocardial damage with longer hospitalization period and higher mortality it is probably due to the hyperactivated sympatheticadrenaline system and strengthened activity of aldosterone in them