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Table 5 American Society of Anaesiologists' status classification: modified from Wolters and colleagues [10]

From: Clinical review: How is risk defined in high-risk surgical patient management?

Class Description Mortality (%)
I Healthy 0.1
II Mild systemic disease – no functional limitation 0.7
III Severe systemic disease – definite functional limitation 3.5
IV Severe systemic disease – constant threat to life 18.3
V Moribund patient unlikely to survive 24 hours with or without operation 93.3
E Emergency operation