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Table 1 Model variable definitions

From: Development of a predictive model for major adverse cardiac events in a coronary artery bypass and valve population

Variable Definition
Age Patient age at the time of surgery
Gender Male or Female
Body mass index Calculated in kilograms and centimeters.
Diabetes Any history of Diabetes Mellitus, regardless of duration
Pre-op Afib Any previously documented history of Atrial Fibrillation
COPD Any preivous documented history of Chronic Obstructive Pulmonary Disease
CVD Any Transient Ischemic Attack, Cerebrovascular Accident/Stroke, history of cerebrovascular surgery, or any carotid disease.
PVD Whether the patient has Peripheral Vascular Disease, as indicated by claudication; amputation for arterial insufficiency; aorto-iliac occlusive disease reconstruction; peripheral vascular bypass surgery, angioplasty, or stent; documented AAA.
Frailty Any deficiency in the Katz index of Activities of Daily Living (independence in feeding, bathing, dressing, transferring, toileting, and urinary continence), as well as independence in ambulation (no walking aid or assist required) or any clear evidence of a previous diagnosis of dementia by a physician.
EF<40 Ejection fraction measured less than 40% by any modality.
NYHA (I-IV) New York Heart Association Class. I = Patients with cardiac disease but without limitation of physical activity. II = Patients with cardiac disease resulting in slight limitation of physical activity (fatigue, palpitations, dyspnea, or anginal pain). III = Patients with cardiac disease resulting in marked limitation of physical activity. IV = Patients with cardiac disease resulting in inability to carry on any physical activity without discomfort. Symptoms of cardiac insufficiency or of the anginal syndrome may be present even at rest.
Hemoglobin Most recent hemoglobin level prior to day of surgery.
Pre-op creatinine Highest preop serum creatinine for this admission.
Redo sternotomy Any history of previous surgery that traversed the anterior mediastinum.
Surigical priority Elective [stable at home], in-house [requiring hospitalization until the time of surgery], urgent [requiring surgery within 24 hours to minimize further clinical deterioration], or emergent [no delay in surgery].
Procedure Any Coronary artery bypass grafting, aortic valve replacement or repair with/without CABG, or Mitral valve replacement or repair with/without CABG.