Comparison of Anorectal Manometry, Rectal Balloon Expulsion Test, and Defecography for Diagnosing Defecatory Disorders

A reduced rectoanal gradient, compared with age- and sex-matched asymptomatic individuals, was the most important parameter on anorectal manometry to predict impaired evacuation by balloon expulsion test or defecography and should be considered probable evidence of a defecatory disorder.