High resolution manometry images showing patterns of defecation

High resolution manometry images showing (A) normal pattern of defecation in a healthy subject and (B) an incoordinated or dyssynergic pattern of defecation in a subject with constipation and dyssynergic defecation. In the normal subject the anal pressure decreases (Green color: Pressure = 20 mmHg), whereas in the dyssynergic subject there is paradoxical increase in anal sphincter pressure (Red color: Pressure = 100 mmHg). The rectal pressure increases in both subjects.