Table 1

Definition of risk factors

Risk factorDefinition
Smoking historyAny history of tobacco use
DiabetesAny history of diabetes regardless of duration
Renal failureBlood creatinine > 140 μmol/l or on dialysis
HypertensionBlood pressure > 140/90 mm Hg or on antihypertensive drugs
Cerebrovascular accidentCentral neurological deficit persisting > 24 hours or previous  cerebrovascular surgery
Chronic obstructive pulmonary diseasePharmacological therapy for COPD or FEV1 < 75% predicted
Unstable anginaMyocardial ischaemia requiring hospitalisation and use of iv  medication for control
Urgent surgerySurgery within 24 hours of referral
Emergency surgeryNo delay in providing operative intervention
SalvageCardiopulmonary resuscitation on route to operating theatre or  during anaesthesia
  • Definitions as given in the Society of Thoracic Surgeons National Cardiac Surgery database manual for data managers.13