Study Endpoints and definitions
Short‐term outcomes included: 30-day mortality, 30-day Major Adverse Cardiac and Cerebral Events(MACCE), reoperation for bleeding and deep sternal wound infection(DSWI). MACCE was defined as composite of mortality, myocardial infarction and stroke. MI was defined according to the fourth international definition of MI14. Stroke was defined as the development of a new permanent neurologic deficit as confirmed by stroke team member assessment of the patient and computed tomography of the central nervous system, magnetic resonance imaging, or at autopsy examination. DSWI was defined by the Center for Disease Control and Prevention15. Incomplete revascularization(IR) was defined according to anatomic definition where at least one vessel with a stenosis(>50%) and a size of >1.5mm was not revascularized16.
The long‐term outcome was all‐cause mortality, which is considered as an objective and unbiased endpoint for comparative studies17. Information about death at follow-up was retrieved from the National Health Care registry of the Ministry of Health of the Republic of Poland, that stores and analyses all health‐related data. Data regarding postoperative outcomes were available for all patients in the study.