ACS	Acute coronary syndrome
CABG	Coronary artery bypass grafting
CAD	Coronary artery disease
COVID-19	The coronavirus disease 2019
CPB	Cardiopulmonary bypass
CSS	Classifications of Canadian Cardiovascular Society
DM	Diabetes mellitus
EUROSCORE II	The European System for Cardiac Operative Risk Evaluation
FREEDOM	Future Revascularisation Evaluation in Patients with Diabetes Mellitus: Optimal Management of Multivessel Disease
HA	Artery hypertension
ICU	Intensive care unit
KROK	The Polish National Registry of Cardiac Surgical Operations database
MIDCAB	Minimally invasive coronary artery bypass
NYHA	New York Heart Association
OPCAB	Off-pump coronary artery bypass
PCI	Percutaneous coronary intervention
SARS-CoV-2	Severe acute respiratory syndrome coronavirus 2
SYNTAX	Synergy between PCI with Taxus and Cardiac Surgery
TVCAD	Triple vessel coronary artery disease