Abstract
Various anorectal physiology testing and imaging methods can be utilized in evaluating, diagnosing, and managing pelvic floor disorders. Anorectal manometry systems include
perfusion systems, microtransducer systems, balloon systems, and high-resolution manometry systems, each of them confer clinical advantages and disadvantages in evaluating fecal incontinence, constipation, and anal pain. These systems provide objective measures of the sphincter complex, including resting and squeeze pressures, anal canal length, anal motility, rectal sensation and compliance, pressures during simulation of evacuation, and anorectal reflexes. Colonic transit studies may also be utilized in evaluating patients with intestinal constipation due to slow-transit or colonic inertia. Neurophysiologic examinations, including EMG and pudendal nerve terminal motor latency, may provide utility in mapping anal sphincter defects and neurogenic sphincter injuries. Additional methods, including endoanal ultrasound, cindefecography, and magnetic resonance imaging, may provide initial anatomic evaluation of the anal sphincter complex, morphologic visualization of defecatory function, and dynamic evaluation of the pelvic floor. Guidelines for utilizing these modalities in evaluating fecal incontinence and constipation are provided by the American Society of Colon and Rectal Surgeons.
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Lei, J., Nofi, C., Rivadeneira, D.E. (2020). Introduction to Methods of Anorectal Physiology Evaluation. In: Oliveira, L. (eds) Anorectal Physiology. Springer, Cham. https://doi.org/10.1007/978-3-030-43811-1_5
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