Studies of Application of Combined General Anesthesia and Bilateral TPVB in OPCABG

Inclusion Criteria: * Heart function grade II - III (Using the cardiac function classification method formulated by American Heart Disease Institute) * The in - hospital was treated with off pump coronary artery bypass grafting（CABG) operation and general anesthesia. * Had a good cognition, and signed the informed consent. * Aged between 35 and 80. * The age, clinical examination and other generally situation of the two groups of patients had no statistical significance. no merger of valvular disease left ventricular ejection fraction \> 40%, do not need intraaortic balloon counterpulsation support, without spinal deformity, no vertebral side clearance space-occupying lesions Exclusion Criteria: * Combined with other blood coagulation dysfunction, serious brain, liver and kidney dysfunction, endocrine system diseases and serious infectious disease. * Patients with severe mental disorders cannot cooperate with the treatment. * Emergency operation * Have taboo of Echocardiography and pulmonary catheterization by echocardiography. * Allergic to Local anesthetics drug. * Suspected or had alcohol, drug abuse history. * Spinal or paravertebral lesions.