Rectal Cooling Test
The rectal cooling test is suggested to differentiate between rectal inertia and impaired relaxation/paradoxical contraction
Other techniques include manometry, balloon expulsion test, evacuation proctography (see defecating proctogram), and MRI defecography. Diagnostic criteria are: fulfillment of criteria for functional constipation, manometric and/or EMG and/or radiological evidence (2 out of 3), evidence of adequate expulsion force, and evidence of incomplete evacuation. Recent dynamic imaging studies have shown that in persons diagnosed with anismus the anorectal angle during attempted defecation is abnormal, and this is due to abnormal (paradoxical) movement of the puborectalis muscle.
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