Volume 126, Pages S90-S98 (January 2004) Outcome measures for fecal incontinence: anorectal structure and function  Adil E Bharucha  Gastroenterology  Volume 126, Pages S90-S98 (January 2004) DOI: 10.1053/j.gastro.2003.10.014

Figure 1 Anal sphincter pressures assessed on 3 separate occasions by 4 circumferentially oriented transducers stationed at 1 cm from the anal verge; transducers were located in separate quadrants, labeled as right or left, anterior or posterior. The maximum squeeze pressure is the highest pressure recorded by all 4 transducers during 1 of 3 maneuvers; the average squeeze pressure is calculated by averaging pressures across all 3 maneuvers. In this example, resting and squeeze pressures were comparable in all 4 quadrants. Gastroenterology 2004 126, S90-S98DOI: (10.1053/j.gastro.2003.10.014)

Figure 2 A rectal barostat assembly. A highly compliant polyethylene balloon is inflated by a barostat, which monitors intraballoon pressure and volume. Gastroenterology 2004 126, S90-S98DOI: (10.1053/j.gastro.2003.10.014)

Figure 3 (A ) Paradigm for rectal conditioning distention and pressure-volume relationship (compliance curve). During the compliance curve, the balloon is inflated from 0 to 32 mm Hg in 4-mm steps at 1-minute intervals. (B) Rectal pressure-volume curves approximate to a power exponential function. Note the close approximation between actual data and the fitted curve. Prhalf = pressure at half-maximum volume. Gastroenterology 2004 126, S90-S98DOI: (10.1053/j.gastro.2003.10.014)