Quantitation of defecation function using radionuclide artificial stool in children with chronic constipation

Area of Science:

• Pediatric Gastroenterology
• Nuclear Medicine
• Clinical Physiology

Background:

• Chronic constipation is a common pediatric issue.
• Objective assessment of treatment efficacy is crucial for managing pediatric constipation.
• Rectal emptying dynamics are not fully understood in this population.

Purpose of the Study:

• To assess the utility of scintigraphically determined evacuation fraction (EVF) as an objective follow-up measure in children with chronic constipation.
• To correlate patient symptoms with rectal emptying rates.
• To evaluate changes in EVF following conventional laxative therapy.

Main Methods:

• Thirty children with chronic constipation underwent baseline anal manometry and scintigraphic evacuation studies.
• Scintigraphic studies involved rectal instillation of artificial stool and pre/post-evacuation imaging to calculate EVF.
• 20 patients were reassessed after 3 months of conventional laxative treatment.

Main Results:

• Baseline EVF was low in chronically constipated children.
• In 70% of patients who improved with therapy, mean EVF increased significantly from 43.6% to 62.2% (p < 0.001).
• The volume required to elicit rectal evacuation decreased significantly after treatment.

Conclusions:

• Scintigraphic EVF is a valuable, objective tool for monitoring treatment response in pediatric chronic constipation.
• Conventional laxative treatment can improve rectal emptying efficiency.
• Radionuclide-based EVF determination provides a reliable method for follow-up in this patient group.