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American Society of Anesthesiologists (ASA) Physical Status Scale
Class I
Minimal Risk
Normal healthy animal, no underlying disease
Class II Slight risk, minor disease present
Animal with slight to mild systemic disturbance, animal able to compensate
Neonate or geriatric animals, obese
Class III
Moderate risk, obvious disease present
Animal with moderate systemic disease or disturbances, mild clinical signs
Anemia, moderate dehydration, fever, low-grade heart murmur or cardiac disease
Class IV
High risk, significantly compromised by disease
Animals with preexisting systemic disease or disturbances or a severe nature
Severe dehydration, shock, uremia, or toxemia, high fever, uncompensated heart disease, uncompensated diabetes, pulmonary disease, emaciation
Class V
Extreme risk, moribund
Surgery often performed in desperation on animal with life threatening systemic disease
Advance cases of heart, kidney, liver or endocrine disease, profound shock, sever trauma, pulmonary embolus, terminal malignancy
"E" denotes emergency
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