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Evacuation disorders in constipation tied to rectal gas volume

06 Dec 2016

Rectal gas volume in patients with constipation may be greater among those with rectal evacuation disorders than among those without these disorders, a study finds.

The study included 1,552 patients with constipation who were evaluated over 20 years. Of these, 141 had pelvic CT examinations, including anorectal manometry, balloon expulsion tests and colon transit tests. Patients were then grouped according to their condition: rectal evacuation disorders, slow transit constipation and normal transit constipation.

There were two observers who measured areas of gas on each image using standard CT software. Rectal gas volume, maximal rectal gas transaxial area and area of rectal gas were compared among the three patient groups. 

The measurements of rectal gas volume by the two observers were positively correlated (inter-class correlation coefficient 0.99; p<0.001). Measurements of rectal gas volume and maximal rectal gas transaxial area differed among the groups (p<0.001 for both).

Patients with rectal evacuation disorders had higher median rectal gas volume compared with patients with slow transit or normal transit constipation (13.84 vs 2.51 and 1.33 cm3; p<0.05 for both).

Similarly, area of rectal gas, which was correlated with maximal rectal gas transaxial area (Spearman correlation coefficient, 0.7; p<0.001), differed among the three groups (p=0.033). Patients with rectal evacuation disorders showed greater areas of rectal gas on the abdominal scout film compared with patients with normal transit constipation.

The findings indicate that rectal gas volume may be used to identify evacuation disorders in patients with constipation.

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Most Read Articles
Roshini Claire Anthony, 11 Sep 2019

Beta-blockers could reduce mortality risk in patients with heart failure with reduced ejection fraction (HFrEF) and moderate or moderately-severe renal dysfunction without causing harm, according to the BB-META-HF* trial presented at ESC 2019.

Elvira Manzano, 2 days ago

The US Preventive Services Task Force (USPSTF), in an update of its 2013 recommendations, called on clinicians to offer risk-reducing medications to women who are at increased risk for breast cancer but at low risk for adverse effects.

Pearl Toh, 3 days ago
The use of SGLT-2* inhibitors was not associated with a higher risk of severe or nonsevere urinary tract infections (UTIs) in patients with type 2 diabetes (T2D) compared with DPP**-4 inhibitors or GLP-1*** receptor agonists, a population-based cohort study shows.
6 days ago
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