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. Author manuscript; available in PMC: 2012 Feb 1.

Published in final edited form as: Best Pract Res Clin Gastroenterol. 2011 Feb;25(1):127–140. doi: 10.1016/j.bpg.2010.11.001

High Resolution Manometry images showing normal pattern of defecation in a healthy subject (3 a) and an incoordinated or dyssynergic pattern of defecation in a subject with constipation and dyssynergic defecation(3 b). In the normal subject the anal pressure decreases (Green color-Pressure=20 mm Hg), whereas in the dyssynergic subject there is paradoxical increase in anal sphincter pressure (Red color-Pressure=100mm Hg). The rectal pressure increases in both subjects.

High Resolution Manometry images showing normal pattern of defecation in a healthy subject (3 a) and an incoordinated or dyssynergic pattern of defecation in a subject with constipation and dyssynergic defecation(3 b). In the normal subject the anal pressure decreases (Green color-Pressure=20 mm Hg), whereas in the dyssynergic subject there is paradoxical increase in anal sphincter pressure (Red color-Pressure=100mm Hg). The rectal pressure increases in both subjects.