Demographic and comorbidity characteristics
Basic demographic data including age, gender, date of birth, height,
weight, body mass index (BMI) and American Society of Anaesthesiologists
(ASA) grade was documented. Specific pre-operative conditions were
grouped into comorbid groups and documented for each patient:
cardiovascular (ischemic heart disease, previous coronary artery bypass
grafting, previous percutaneous coronary intervention, pacemaker
insertion, defibrillator insertion, previous valve repair, heart
failure, cardiomyopathy, hypertension, pulmonary hypertension and atrial
fibrillation), respiratory (asthma, COPD, bronchiectasis, cystic
fibrosis and obstructive sleep apnoea), metabolic (type I diabetes, type
II diabetes and hyperlipidaemia), autoimmune (rheumatoid arthritis,
psoriasis, polymyalgia rheumatica, and systemic lupus erythematosus) and
renal disease.