Abstract:Cinnamomum migao oil (CV-3) 0.2ml·kg-1 was intraduodenum given to anesthetized open-chest cats-Ninety minutes after treatment with the oil, the SAP and DAP were slowly reduced to 15.2% and 14.2%, respec-tively. At the sametime, the HR was slowed down and CO decreased. The left ventricular pressure (LVP), the leftventricular end diastolic pressure (LVEIDP), dp/dtmax and Vmax were remarkably reduced respectively. The LVP-(dp/dtmax)P-1 loop was narrowed. Isosorbide dinitrate showed similar effects to CV-3.