Figure 1

Figure 1

Resting state manometry (control subject). Prect, rectal pressure; Pabd, abdominal (bladder) pressure; P*rect, differential rectal pressure = Prect−Pabd; Pana, anal pressure, EMG, electromyography. This subject had normal anal closure pressure >40 cm H2O and anal pressure increase on squeezing >50 cm H2O (Pana). On coughing and straining, his abdominal pressure increased significantly (Pabd).