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Table 1 Characteristics of patient’s anorectal function

From: An anatomic anal sphincter-saving procedure for rectal cancers located at anorectal junction

Characteristic Pre-operative Post-operative Normal values (males)
Mean maximum anal resting pressure (mmHg) 68 50 59–74
Instant maximum squeeze anal pressure (mmHg) 175 110 60–220
Prolonged maximum squeeze anal pressure (mmHg) 120 45 40–200
Anal sphincter length (cm) 3.8 2.4 2.5–5
Minimum rectal volume for sustained anal relaxation (ml) 40 20 30–60
Rectal volume for first sensation (ml) 30 30 20–110
Rectal volume for permanent urge to defecate (ml) 150 60 60–170
Maximum tolerable rectal volume (ml) 220 100 110–320
Wexner score 0 7 0, perfect continence
20, major incontinence