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Class 1

movement of fingers only

Class 2

movement of fingers and wrist

Class 3

movement of fingers, wrist, elbows

Class 4

use of entire arm/shoulder

Class 5

use of entire upper torso 

Stage 1

analgesia (relaxed and euphoric)

stage 2

excitement (nausea and vomiting may occur)

stage 3

general anesthesia (painless and unconscious)

stage 4

respiratory failure/cardiac arrest