Dyssynergic Defecation: A Common Culprit of Chronic Constipation and Abdominal Pain
Updated: Jan 10
Constipation, an often under reported health issue, affects about 30% of Americans. ¹ The diagnosis of chronic constipation may seem like a simple concept, however the etiology of chronic constipation presents itself in many different forms. Dyssynergic defecation is one of many factors that can lead to a presentation of chronic constipation in a patient. Dyssynergic defecation or “paradoxical contraction” occurs when the muscles of the abdominals, puborectalis sling, and external anal sphincter function inappropriately while attempting a bowel movement. ² The lack of coordination of these muscles results in a contraction versus a lengthening of the pelvic floor muscles with baring down. Dyssynergic defecation is different than a structural issue such as a rectocele or hemorrhoids causing the inability to pass stool effectively or constipation due to slow colon transit time or pathological disease. Making the diagnosis of dyssynergic defecation by symptoms alone is often not reliable secondary to overlap of similar symptoms with chronic constipation due to factors such as a structural issue, irritable bowel syndrome (IBS), or irritable bowel disease (IBD). The diagnosis of dyssynergic defecation can be difficult and is often made through physiologic testing such as balloon expulsion testing or MRI with defecography. ² However, physical therapists can often manually feel that a paradoxical contraction is happening when asking a patient to bare down on evaluation.
Patients with dyssynergic defecation may present to pelvic floor physical therapy with complaints of: ¹ ²
Abdominal symptoms such as bloating, pain, and cramping
Poor response to laxatives and fiber supplementation that does not fully resolve their issue
Have had testing for anatomical or neurological abnormalities with no significant findings
Complaints of concomitant pelvic pain due to over activity of the pelvic floor muscles
Physical Therapists specializing in pelvic floor rehab can be a valuable part of the medical team with treating these patients. Biofeedback training by physical therapists has been shown to decrease anorectal related constipation symptoms and abdominal symptoms in patients with dyssynergic defecation. In a sample of 77 patients with dyssynergic defecation, physical therapists provided biofeedback training for 6-8 weeks that included manual and verbal feedback, surface EMG, exercises using a rectal catheter, rectal ballooning to improve rectal sensory abnormalities, ultrasound, pelvic floor and abdominal massage, electrical stimulation if needed, and core strengthening and stretching to improve the patients’ maladaptive habits while attempting to pass a bowel movement. Significant decreases were seen on all three domains (abdominal, rectal, and stool) on the PAC-SYM (Patient Assessment of Constipation) questionnaire post biofeedback training. ² It is noteworthy that 74% of these patients presented to the clinic with complaints of abdominal symptoms such as bloating, pain, discomfort, and cramping.
Knowing how to effectively treat these patients and ask the right questions is valuable in the scheme of pelvic floor rehab secondary to overlapping symptoms of different causes of chronic constipation. Physical therapists are able to provide these patients with conservative treatment that can effectively improve or eliminate their problem, recognize dyssynergic defecation as a possible differential diagnosis, and refer to the appropriate medical professional for further testing. Recognizing and treating dyssynergic defecation is something physical therapists will learn how to become effective at in the upcoming Herman and Wallace Course: Bowel Pathology, Function, Dysfunction & the Pelvic Floor April 2-3 in Tampa, FL and October 8-9 in Fairfield, CA.
1. Sahin M, Dogan I, Cengiz M et al. (2015). The impact of anorectal biofeedback therapy on quality of life of patients with dyssynergic defecation. Turk J Gastroenterol. 26(2):140-144.
2. Baker J, Eswaran S, Saad R, et al. (2015). Abdominal symptoms are common and benefit from biofeedback therapy in patients with dyssynergic defecation. Clin Transl Gastroenterol. 30(6)e105. doi: 10.1038/ctg.2015.3