OBJECTIVETo investigate the mechanism of Compound Qidan Liquid (CQD) for intervening ventricular remodeling (VR) after acute myocardial infarction (AMI) in Chinese mini-pigs from hemodynamic and collagen metabolic views.

METHODSAMI model of Chinese mini-pigs was established by left anterior descending (LAD) coronary artery ligation. The model pigs were then randomly divided into the sham-operative group, the model group, the captopril group, the high and low dose of CQD (hCQD and lCQD) groups, the former two were treated with normal saline and the latter three treated with corresponding drugs by gastrogavage for 4 weeks after modeling. Blood pressure (BP), left ventricular pressure (LVP), maximum ascending velocity of left ventricular pressure (dp/dtmax), myocardial renin (MCR), angiotensin (Ang II), total collagen (TC), procollagen type III (PC III), collagen type IV (CIV), laminin (LM), serum hyaluronic acid (HyA) as well as pathologic changes in myocardium were observed.

RESULTSAs compared with in the model group, levels of BP, LVP and dp/dtmax were significantly higher, LM and Ang II were lower in the hCQD group (P < 0.05 or P < 0.01); LVP was higher in the lCQD group (P <0.05); LVP and dp/dtmax were higher, Ang II was lower in the captopril group (P <0.05). Besides, levels of HyA and TC were lower in all the three medicated groups (P <0.01), while the differences of PC III and CIV among groups were insignificant.

CONCLUSIONCQD has a beneficial effect in Chinese mini-pigs after AMI for increasing LVP and dp/dtmax, improving myocardial contractility and hemodynamic condition, decreasing myocardial Ang II contents, decreasing deposition of collagen so as to alleviate the pathological process of VR after AMI.