2.8. Concomitant Treatments

All patients enrolled received concomitant standard therapy of PCI. Patients planning urgent PCI received loading dose clopidogrel (300mg)(Plavix, Sanofi-Aventis) and chew an aspirin (300mg) (Aspirin, Bayer) before operation; patients undergoing selective PCI started to take aspirin (100mg) and clopidogrel (75mg) orally three days prior to operation. All PCI operations enrolled in the investigation used drug-eluting stents. Dalteparin sodium (Pfizer, USA) (5000u, subcutaneous injection for 5-7 days) or GPIIb/IIIa receptor antagonist (Tirofiban, orally for 36-48 hours, Yuanda Pharmaceutical, Wuhan, China) was left to the discretion of investigator with consideration of patients' weight and state of illness. After PCI, clopidogrel (75mg) was administered continuously for 12 months, and aspirin (100mg) was recommended to taken as long-term medication. In addition, investigators were encouraged to follow the established guideline for CHD secondary prevention as to prescription of ACEI, β-receptor blockers, and statins.