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Table 1 ASA physical status classification system

From: A comparison of three induction regimens using succinylcholine, vecuronium, or no muscle relaxant: impact on the intraoperative monitoring of the lateral spread response in hemifacial spasm surgery: study protocol for a randomised controlled trial

Classification Physical status
1 A normal healthy patient.
2 A patient with mild systemic disease.
3 A patient with severe systemic disease.
4 A patient with severe systemic disease that is a constant threat to life.
5 A moribund patient who is not expected to survive without the operation.
6 A patient declared brain-dead whose organs  are being removed for donor purposes.