Evaluation of C13 Breath Test for Upper Gastrointestinal Bleeding in Patients Who Need Double Antiplatelet After PCI

Inclusion Criteria: * The diagnosis of patients with coronary heart disease is based on the diagnostic criteria of ACA/AHA,the diagnostic criteria for upper gastrointestinal bleeding refer to the guidelines for the diagnosis and treatment of acute non-variceal upper gastrointestinal bleeding. * In the hospital, all patientsI were treated with clopidogrel 300 mg or ticagrelor 180 mg before surgery, and C13 breath test was performed after surgery. * All patients were treated with dual- antiplatelet. * The clinical data of the included subjects were complete. Exclusion Criteria: * Patients with previous liver and kidney disease, Cr greater than 150 μmol / L, AST or ALT increased more than 2 times the normal value of patients. * Patient with history of cerebrovascular disease. * Patients with active gastrointestinal bleeding disease due to cirrhosis or other reasons before PCI. * Patients with abnormal coagulation. * Diabetic patients, diagnostic criteria for anemia: 8th edition of internal medicine, adult males with Hb less than 120g / L or RBC less than 4 × 10\^12 / L, adult women with Hb less than 105g / L or RBC than 3.5 × 10\^12 / L. * Patients with incomplete medical records;7.Patient with pregnant. * Patients with malignant tumors