Preoperative patient factors associated with blood product use in cardiac surgery, a retrospective cohort study

Table 1 Preoperative factors

Patient related factors	Preoperative cardiac status
Body mass index (BMI m/kg²)	New York Heart Association (NYHA) class
Age (years)	Preoperative haemoglobin (g/L)
Diabetes mellitus (yes/no)	Anticoagulant use less than 24 h preoperatively (yes/no)^c
Renal dialysis at the time of operation (yes/no)	Non Valve/CABG procedure (yes/no)
History of smoking (yes/no)	Previous cardiothoracic intervention (yes/no)
Total body surface area^a (TBSA m²)	Presence of cardiogenic shock preoperatively
Presence of respiratory disease^b (yes/no)	Antiplatelet less than 24 h preoperatively^d
Gender (male/female)	Preoperative creatinine clearance

^aTBSA is calculated by 0.007184 × HTM^0.725 × WKG^0.42 where weight (WKG) and height (HTM) are available. Units in m²
^bEither mild: patient is on chronic inhaled or oral bronchodilator therapy moderate: patient is on chronic oral steroid therapy directed at lung disease. Severe: p02 on room air < 60 or pC02 on room air > 50 or mechanical ventilation for chronic lung disease
^cThe use of warfarin/heparin/LMWH/thrombin inhibitors and or factor Xa inhibitors within 24 h of surgery
^dThe use of Ticagrelor or Clopidogrel within 24 h of surgery

ISSN: 1749-8090