In this study, investigators enrolled patients with coronary heart disease who were scheduled to undergo percutaneous coronary intervention (PCI) and had high-risk plaques according to computed tomography angiography (CTA). During the PCI procedure, patients will be randomly assigned to receive either bivalirudin or standard heparin anticoagulation therapy. Investigators will compare the post-PCI coronary angiography-derived index of microcirculatory resistance (CaIMR), thrombolysis in myocardial infarction (TIMI) blood flow grade, CTFC (corrected TIMI frame count), TIMI myocardial perfusion grading(TMPG), levels of troponin, and major adverse cardiac events (MACE) during a follow-up period of 6 months between the two groups. Investigators aim to explore the potential benefits of bivalirudin perioperative anticoagulation therapy in improving coronary microvascular dysfunction (CMD) after PCI for high-risk plaques in coronary artery lesions.
aged 18 years or older;
diagnosed with non-ST-segment elevation myocardial infarction or unstable angina pectoris;
scheduled to undergo elective coronary angiography and intervention;
coronary computed tomography angiography showing high-risk plaque features within 3 months prior to the procedure;
prior PCI of the target vessel within 3 months;
cardiogenic shock, active bleeding, bleeding disorders, irreversible coagulation dysfunction, severe liver dysfunction (Child-Pugh class C), severe renal dysfunction (eGFR < 30 ml/min/1.73m2), and dependence on dialysis;
life expectancy less than 1 year;
chronic total occlusion of the target vessel;