〔Abstract〕 Objective To investigate the protective effects of Jiawei Danshen decoction (JDSH) pretreatment on myocardial ischemia reperfusion injury (IRI) in rats and its molecular mechanisms. Methods The models of left anterior descending coronary artery of ligatured rats for 30 mins and then I/R 30 (or I/R 60) mins were built, fifty-six male SD rats were randomly divided into 7 groups: sham operation group, ischemia reperfusion (I/R) injury for 30 min group (I/R 30),I/R for 60 mins (I/R 60) group, p38MAPK inhibitor SB203580 with I/R30 mins ...