ACE and pulmonary arterial hypertension: MI_timing (time between myocardial infraction and CABG procedure), use of ace inhibitors, family history of cardiovascular disease, diastolic BP, pulmonary artery hypertension, NYHA_class, and PCI_timing (time between incidence of angioplasty and current time) are more prominent factors explaining the LoS between 10–20 days.