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Techniques, measurements (Panel A), and the anal catheter (Panel B). Representative examples of balloon pressure-diameter curves and corresponding fitted curves are shown in healthy women (C and E) and constipated patients (D and F). In all four examples, the opening pressure during distention is lower than anal resting pressure. The opening pressure was lower in panels C and D (resting pressure was 85 and 57 mmHg) than panels E and F (resting pressure was 167 and 114 mmHg).
