American Society of Anesthesiology Classification

(redirected from ASA IV)

American Society of Anesthesiology Classification

A system used by anesthesiologists to stratify severity of patients' underlying disease and potential for suffering complications from general anesthesia
American Society of Anesthesiology patient classification status
ASA I
Normal healthy Pt
ASA II
Pt with mild systemic disease; no functional limitation–eg, smoker with well-controlled HTN
ASA III
Pt with severe systemic disease; definite functional impairment–eg, DM and angina with relatively stable disease, but requiring therapy
ASA IV
Pt with severe systemic disease that is a constant threat to life–eg, DM + angina + CHF; Pts have dyspnea on mild exertion and chest pain
ASA V
Unstable moribund Pt who is not expected to survive 24 hours with or without the operation
ASA VI
Brain-dead Pt whose organs are removed for donation to another
E
Emergency operation of any type, which is added to any of the 6 above categories, as in ASA II E
References in periodicals archive ?
ASA IV patients were more likely to be admitted to HDU.
It was only amongst ASA IV patients that this difference was lost but, within this subset, patient numbers were too small to allow any significant conclusions to be drawn.
Although the numbers are small, this suggests that it was only the least physically fit ASA IV patients who benefited from HDU care, while the more physically fit seemed to do worse in HDU.
Thus it is plausible that the patients categorized as ASA I-III in this study, were not unstable enough to benefit from HDU care and recovery was slowed, whereas the ASA IV patients were unstable enough to benefit from the more aggressive care and this shortened their recovery and length of stay.