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 |