Colonic transit in patients after anterior resection: prospective, comparative study using single-photon emission...

Area of Science:

• Gastroenterology
• Colorectal Surgery
• Medical Imaging

Background:

• Bowel dysfunction is common after anterior resection surgery.
• The underlying pathophysiology, particularly colonic transit, is not well understood.
• Previous studies have not linked colonic transit variations to postoperative bowel symptoms.

Purpose of the Study:

• To investigate the relationship between colonic transit and bowel dysfunction after anterior resection.
• To determine if altered colonic transit contributes to low anterior resection syndrome (LARS).
• To stratify patients based on LARS score and assess their colonic transit profiles.

Main Methods:

• Colonic transit was measured using planar scintigraphy and SPECT/CT in 50 patients post-anterior resection.
• Low Anterior Resection Syndrome (LARS) scores were used to assess symptoms.
• Transit parameters including geometric center (GC), percentage retained isotope, GC velocity index, and half-clearance time (T½) were analyzed.
• Receiver operating characteristic (ROC) curve analyses compared transit parameters between LARS subgroups.

Main Results:

• Significant differences in colonic transit were observed between patients with major LARS and those without.
• Patients with major LARS showed greater GC, lower percentage retained isotope, greater GC velocity index, and shorter T½ at 32 hours.
• Percentage tracer retained at 32 hours demonstrated the highest area under the curve (AUC) of 0.828 for discriminating major LARS from no LARS.

Conclusions:

• Accelerated colonic transit is associated with major LARS after anterior resection.
• Altered colonic transit may be a key factor in the development of postoperative bowel dysfunction.
• Percentage tracer retained at 32 hours is a valuable metric for identifying patients with major LARS.