For expounding the function of coronary collateral circulation during treating coronary heart diseases with acupuncture, the dogs were anaest- hetized with sodium pentobarbital (30Mg/Kg), the left anterior descen- ding branch of coronary artery (LAD) was supplied with blood from ca- rotid, through a three-way tube. When the three-way tube was turned off the myocardial infarction was occured by the blocking blood flow. The coronary return flow (RF), coronary pressure in the infarcted area, left ventricular p...