Detsky Cardiac Risk Index  
Risk Factor Points
MI<6 mo 10
MI>6 mo 5
Canadian Cardiovascular Society angina  
class III 10
class IV 20
Unstable Angina within past 6 mo 10
Alveolar pulmonary edema  
<1 week 10
Ever 5
Critical aortic stenosis 20
Rhythm other than sinus, or pulmonary artery catheters 5
>5 premature ventricular contractions/min 5
Poor medical status 5
Age > 70 yrs 5
Emergency  operation 10
Scoring & Interpretation: Likelihood Ratio of a Cardiac Complication*
Risk Class  
Class I (0-15 pts): 0.42
Class II (16-30 pts): 3.58
Class III (>30 pts): 14.93
*Cardiac complication defined as myocardial infarction, pulmonary edema, ventricular tachycardia, ventricular fibrillation, and cardiac death.  
Detsky AS, Abrams HB, McLaughlin JR, et al.  Predicting cardiac complications in patients undergoing noncardiac surgery. J. Gen Intern Med. 1986:1:211-9.