Perioperative MI, bleeding (2 – 5% require reopening), low cardiac output, atrial fibrillation – 40% of patients, restrictive lung defect, lower lobe collapse, just infection/pneumonia, other infection, late graft stenosis, non-union of sternum, vasoplegic syndrome (increased heart rate + cardiac output issues – severe vasodilatory shock), pericardial tamponade, pulmonary oedema/pleural effusion, pneumothorax/haemothorax, renal impairment/failure, wound infection, neurological – CVA 1-5%,