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A: effect of pancuronium bromide (PB) alone and in combination with sodium nitroprusside (SNP) on the anal canal resting pressure is shown in the tracings with a 9-mm anal probe. B: effect of probe size on EAS active, internal anal sphincter (IAS) active, and anal canal passive tensions. *Statistically significant increase (P < 0.05) in passive tension with increase in probe size (6 and 9 mm compared with 3 mm, n = 4).
