circulatory
hypovolaemia
massive mediastinal bleeding
SIRS response to CPB
cardiac
myocardial ischaemia
myocardial dysfunction
Kinking of a venous graft
arrhythmias
cardiac tamponade
systolic anterior motion of the mitral valve
respiratory
tension pneumothorax
overventilation
pharmacological
propofol or glyceryl trinitrate (GTN)
inadvertent cessation of inotropes or vasopressors
technical error
incorrect calibration of arterial pressure transducer
malposition of arterial pressure transducer.