Risk Factor

Points

Age > 70 years

5

MI < 6 months previously

10

S3 gallop or jugular venous distention

11

Clinically significant aortic stenosis

3

Rhythm other than sinus on EKG

7

> 5 Premature ventricular contractions/minute

7

PO2<60 or PCO2 > 50

Potassium < 3

HCO3 < 20

BUN > 50 or Creatinine > 3

Abnormal aspartate transaminase

Chronic liver disease

Bedridden from noncardiac causes

3

Peritoneal, thoracic, or aortic surgery

3

Emergency surgery

4

Class

Points

Risk

Class I

0-5

Low

Class II

6-12

Intermediate

Class III

13-25

High

Class IV

>26

Very high