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Correlation between Colon Transit Time Test Value and Initial Maintenance Dose of Laxative in Children with Chronic
Mock Ryeon Kim1, Hye Won Park1, Jae Sung Son1
1Department of Pediatrics, Konkuk University School of Medicine, Seoul, Korea.
Insights
The colon transit time (CTT) test does not reliably predict the starting dose of polyethylene glycol (PEG) 4000 or lactulose for children with chronic constipation. This finding suggests that clinical factors, not just CTT results, are crucial for determining initial laxative dosages.
Area of Science:
- Pediatric Gastroenterology
- Clinical Pharmacology
Background:
- Chronic functional constipation is a common pediatric condition requiring effective management.
- Accurate dosing of laxatives like polyethylene glycol (PEG) 4000 and lactulose is essential for treatment success.
- The colon transit time (CTT) test is used to assess gastrointestinal motility in constipated children.
Purpose of the Study:
- To investigate the relationship between colon transit time (CTT) test results and the initial maintenance dosage of polyethylene glycol (PEG) 4000 or lactulose in children.
- To determine if CTT values can predict the required laxative dose for managing chronic functional constipation.
Main Methods:
- A cohort of 190 children with chronic functional constipation, identified from 415 participants, underwent CTT testing after disimpaction.
- Initial maintenance doses of PEG 4000 or lactulose were determined based on defecation diaries and clinical assessments.
- Statistical analyses, including Shapiro-Wilk, Pearson's, and Spearman's correlations, were employed to evaluate the relationship between CTT values and laxative doses.
Main Results:
- The median CTT value across all participants was 43.8 hours.
- No significant linear correlation was found between CTT test values and the initial maintenance doses of PEG 4000 or lactulose, even within specific subgroups.
- Weak correlations (Pearson's R ≈ 0.26) were observed in the largest subgroups, indicating limited predictive value of CTT for initial laxative dosing.
Conclusions:
- Colon transit time (CTT) test results are not a reliable predictor of the initial maintenance dose required for polyethylene glycol (PEG) 4000 or lactulose in pediatric patients.
- Clinical judgment and patient-specific factors remain paramount in establishing appropriate initial laxative dosages for chronic functional constipation.
Purpose:
To evaluate the correlation between colon transit time (CTT) test value and initial maintenance dose of polyethylene glycol (PEG) 4000 or lactulose.
Methods:
Of 415 children with chronic functional constipation, 190 were enrolled based on exclusion criteria using the CTT test, defecation diary, and clinical chart. The CTT test was performed with prior disimpaction. The laxative dose for maintenance was determined on the basis of the defecation diary and clinical chart. The Shapiro-Wilk test and Pearson's and Spearman's correlations were used for statistical analysis.
Results:
The overall group median value and interquartile range of the CTT test was 43.8 (31.8) hours. The average PEG 4000 dose for maintenance in the overall group was 0.68±0.18 g/kg/d; according to age, the dose was 0.73±0.16 g/kg/d (<8 years), 0.53±0.12 g/kg/d (8 to <12 years), and 0.36±0.05 g/kg/d (12 to 15 years). The dose of lactulose was 1.99±0.43 mL/kg/d (<8 years) or 1.26±0.25 mL/kg/d (8 to <12 years). There was no significant correlation between CTT test value and initial dose of laxative, irrespective of the subgroup (encopresis, abnormal CTT test subtype) for either laxative. Even in the largest group (overall, n=109, younger than 8 years and on PEG 4000), the correlation was weak (Pearson's correlation coefficient [R]=0.268, p=0.005). Within the abnormal transit group, subgroup (n=73, younger than 8 years and on PEG 4000) correlation was weak (R=0.267, p=0.022).
Conclusion:
CTT test value cannot predict the initial maintenance dose of PEG 4000 or lactulose with linear correlation.
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