Table 3.

Summary of features used in clinical prediction models. US, United States. STS, Society of Thoracic Surgeons. CHF, Congestive Heart Failure. LV, Left Ventricle. EF, Ejection Fraction. IABP, Intra-aortic balloon pump. COPD, Chronic obstructive pulmonary disease. DM, GFR, Glomerular Filtration Rate. NYHA, New York Heart Association.

Cleveland Clinic Score		Mehta Score		Simplified Renal Index
Derivation Cohort: 15,838 cardiac surgery patients, Single US Center, 1993–2002		Derivation Cohort: 449,524 cardiac surgery patients, Database of > 600 centers, 2002–2004		Derivation Cohort Details: 10,751 cardiac surgery patients, Single Canadian Center, 1999–2004
Validation Cohort: 17,379 cardiac surgery patients from the same center and time period		Validation Cohort: 86,009 cardiac surgery patients from the same database, 2005		Validation Cohort: 9,380 cardiac surgery patients, Two Canadian Centers, 1999–2003
Variable	Points	Variable	Points	Variable	Points
Female Gender	1	Age ≥ 55	0–10	Pre-operative GFR	1–2
CHF	1	Nonwhite race	2	Diabetes requiring medications	1
LV EF < 35%	1	Pre-operative Serum Creatinine	5–40	LV EF ≤ 40%	1
Pre-operative IABP	2	NYHA Class IV Heart Failure	3	Previous cardiac surgery	1
COPD	1	Diabetes treated with oral medications	2	Pre-operative IABP	1
Insulin-dependent Diabetes	1	Insulin-dependent Diabetes	5	Non-elective surgery	1
Previous cardiac surgery	1	COPD	3	Type of Surgery	0–1
Emergency surgery	2	Recent Myocardial Infarction	3
Type of Surgery	0–2	Previous cardiac surgery	3
Pre-operative Serum Creatinine	0–5	Cardiogenic shock	7
		Type of Surgery	0–7
Score Range	0–17	Score Range	0–85	Score Range	0–8