- This is an 82 year old man with diabetes and hyperlipidaemia who underwent an aortic valve replacement and CABG 1 week ago. His pre-operative left ventricular ejection fraction was 20% and he required an intra aortic balloon pump post operatively. His post operative course was complicated by a brief asystolic arrest and he remains ventilated 1 week post operatively. Candidates were asked to assess the patient for causes of slow respiratory wean. Ongoing issues included – persistent inotrope requirement, encephalopathy, search for sepsis, consideration of diuresis +/- tracheostomy.