Following a myocardial infarction a patient may be impaired by the level of exertion that he or she is able to tolerate. This may restrict the amount of work that the person is able to perform.
percent impairment following infarction =
= ((MET level prior to ischemic event) - (MET level after ischemic event)) / (MET level prior to ischemic event) * 100
where:
• The resting maximum oxygen consumption in mL per minute per kilogram is defined as 1 MET = 3.5 mL/min/kg.
Impairment Rating based on Maximum Oxygen Consumption
maximum oxygen consumption in mL/kg/min
Impairment Rating
> 25
none
20 - 25
mild to moderate
15 - 20
severe
< 15
total
Haskell Work Classification in Ischemic Heart Disease
Work Classification
Peak METS
Activity
heavy
> 6
climbing stairs
medium
4 - 6
carrying 50 lbs.
light
2 - 4
carrying 20 lbs.
sedentary
< 2
sitting or carrying 10 lbs
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