Colonic transit time in mentally retarded persons

The relationship between the severity of intellectual and developmental disabilities (IDDs) in adults with IDDs and eating and drinking problems and nutritional status

BACKGROUND

Adults with intellectual and developmental disabilities (IDDs) experience eating, drinking and swallowing problems, such as chewing problems, choking, gagging, coughing during eating, aspiration and rumination syndrome, which may lead to poor nutritional status. This study aimed to determine the relationship between IDD levels, eating, drinking and swallowing problems and nutritional status in adults with IDDs.

METHODS

The sample consisted of 71 participants (37 men and 34 women) with a mean age of 22.5 ± 7 years (range 18-60 years). Professionals classified intellectual disability as mild, moderate or severe. The Screening Tool of Feeding Problems scale was applied to the caregivers of adults with IDDs to identify eating, drinking and swallowing problems. Dietary intake was assessed using a 24-h dietary recall and a food and nutrition photograph catalogue. The researchers measured body weight, height and middle upper arm circumference. Body mass index was calculated. Four body mass index categories were determined: underweight (<18.5 kg/m2 ), normal weight (18.5-24.9 kg/m2 ), overweight (25.0-29.9 kg/m2 ) and obese (≥30 kg/m2 ). Chi-squared tests were used to detect the relationship between IDD levels and eating and drinking problems, and analysis of variance tests were conducted to detect the relationship between IDD levels with anthropometric measurements and dietary intake.

RESULTS

Participants had mild (42.3%; n = 30), moderate (29.6%; n = 21) or severe IDD (28.2%; n = 20). They were underweight (12.7%; n = 9), normal weight (59.2%; n = 42) or overweight and/or obese (28.2%; n = 20). Participants with severe IDD had significantly higher Screening Tool of Feeding Problems 'nutrition-related behaviour' and 'eating and drinking skill deficit problem' sub-scale scores than those with mild IDD. However, the groups had no significant difference in 'food refusal and selectivity' sub-scale scores. Participants with severe IDD also had anorexia prevalence similar to those with mild IDD. The groups did not significantly differ in anthropometric measurements, daily energy intake and macronutrient and micronutrient intake.

CONCLUSIONS

While adults with severe IDD had more eating and drinking skill deficits (e.g. chewing problems and independent eating difficulties) and nutrition-related behaviour problems than those with mild IDD, the eating, drinking and swallowing problems, which may critically affect their food intake, were similar to adults with mild IDD. The anthropometric measurements and energy and nutrient intakes of adults with severe IDD were not significantly different from those with mild IDD consistently. Findings indicate that nutritional deficiencies and nutritional behaviour problems may be avoidable in adults with IDDs.

Definitions, signs, and symptoms of constipation in people with severe or profound intellectual disabilities: A systematic review

Background

It is difficult to diagnose constipation for people with severe or profound intellectual disabilities. Definitions for this are ambiguous, and the symptoms and signs are often unnoticed. The aim of this study is to identify clear definitions of constipation for people with different levels of intellectual disabilities and to identify signs and symptoms.

Method

Guided by the PRISMA statement, a systematic review of the literature was conducted within electronic databases MEDLINE, Embase, CINAHL, Cochrane, and PsycINFO. Definitions, signs, and symptoms were extracted and the quality of definitions was assessed.

Results

In total, 24 studies were included. Quality of definitions ranged from poor to good quality. Standard and referenced definitions were used in ten studies, a self-composed definition was employed in eleven studies; and three studies did not refer to a source of the definition. The self-composed definitions had not been evaluated after being used for the target group, and no scientific substantiation was available. A broad range of signs and symptoms were described.

Conclusions

No substantiated definition has been ascertained for constipation for people with severe or profound intellectual disabilities. Further research will be necessary to identify which signs and symptoms are important for defining constipation in this target group.

Laxative use among older adults with intellectual disability: a cross-sectional observational study

BACKGROUND

Chronic constipation is a prevalent issue in older people with intellectual disabilities and may have a significant negative impact on quality of life. The use of laxatives have not been adequately studied in this population.

OBJECTIVE

To examine laxatives in relation to prevalence, pattern, dosage, reported indication and correlates.

SETTING

Older people with intellectual disabilities who live independently, in community group homes or residential care in Ireland.

METHOD

Data was extracted from wave 2 (2013/2014) of the Intellectual Disability Supplement to the Irish Longitudinal Study on Ageing (IDS-TILDA). Descriptive statistics, bivariate analyses and multiple logistic regression were carried out. Laxative use was analysed using two indicators for chronic constipation, reported doctor's diagnosis of constipation and Rome III criteria.

MAIN OUTCOME MEASURE

Laxative use.

RESULTS

Among the cohort n = 677, chronic constipation was reported by 38.5% (n = 257). In total 41.5% (n = 281) reported 431 laxatives (mean ± 1.53 ± 0.74), with 74.3% (n = 209) of those with laxative use reporting chronic constipation. There were 40% (n = 113) who took 2 + laxatives, within which, 60% (n = 67) were using a combination from same laxative class. Reporting chronic constipation, living in residential care, exposure to anticholinergics and receiving soft/liquidized food were significantly associated with laxative use.

CONCLUSION

Chronic constipation and laxative use were highly prevalent in this study of older adults with intellectual disabilities. The treatment of constipation appeared to be unsystematic. Intra-class laxative use was frequent. There is a need for evidence-based treatment guidelines developed especially for people with intellectual disabilities to provide effective, quality care.

A method for identifying associations between seizures and possible trigger events in adults with intellectual disability

OBJECTIVES

Precipitants of seizures are often reported by patients and carers, but the accuracy of these claims remains unknown. Focusing on epilepsy in people with intellectual disability (ID), the aims of this work were to (1) identify a set of methods for assessing the validity of reported seizure triggers in individual patients; and (2) undertake an initial assessment of the ease of implementation and acceptability of the method by applying it to a series of cases.

METHODS

Data collection materials (developed with carer involvement) consisted primarily of carer diaries of seizure and trigger occurrences. Statistical analysis of diary data was using the self-controlled case series method. Unlike previously used methods, the analysis method included a means of choosing the time window, following trigger exposure, during which changes in seizure likelihood are to be assessed.

RESULTS

The method developed was trialed in five adults with ID and epilepsy, who had a range of ID severities and living circumstances. Examples of the application of the method in two of the five cases are presented for illustrative purposes. The method was acceptable to participants and most aspects successfully implemented.

SIGNIFICANCE

This method may be useful for clinicians and researchers wishing to investigate possible triggers in individual patients with epilepsy and ID. It also supports the identification of a statistically defined time window following exposure to a precipitant, during which the risk of developing a seizure is increased. The identification of such a window has value not just in contributing to clinical management, but also in guiding future work into the mechanisms of seizure precipitation.

A descriptive study of colorectal function in adults with Prader-Willi Syndrome: high prevalence of constipation

BACKGROUND

Some patients with Prader-Willi Syndrome (PWS) have symptoms of constipation, but bowel function in PWS has never been systematically evaluated. The aim of the present study was to describe colorectal function in PWS by means of validated techniques.

METHODS

Twenty-one patients with PWS (14 women, age 17-47 (median = 32)) were evaluated with the Rome III constipation criteria, stool diary, digital rectal examination, rectal diameter assessed from transabdominal ultrasound, and total gastrointestinal transit time (GITT) determined with radio-opaque markers. Results were compared with those of healthy controls.

RESULTS

Among PWS patients able to provide information for Rome III criteria, 8/20 (40%) fulfilled the criteria for constipation. Most commonly reported symptoms were a feeling of obstructed defecation (8/19, 42%), <3 defecations per week (8/17, 47%), straining during defecation (7/19, 37%) and lumpy or hard stools (6/19, 32%). Rectal diameter did not differ between PWS (median 3.56 centimeters, range 2.24-5.36) and healthy controls (median 3.42 centimeters, range 2.67-4.72) (p = 0.96), but more PWS patients (13/20; 65%) than healthy controls (3/25; 12%) (p < 0.001) had fecal mass in the rectum. Median GITT was 2.0 days (range 0.5-4.4) in PWS versus 1.6 (range 0.7-2.5) in the control group (p = 0.26). However, GITT was >3 days in 5/21 (24%) of PWS and none of the controls (p = 0.047).

CONCLUSION

Constipation is very common in PWS. Patients with PWS have an increased prevalence of prolonged GITT and palpable stools in the rectum at digital rectal examination.

Colon transit time in healthy children and adolescents

PURPOSE

The aims of this study are to describe normal colon transit time (CTT) in healthy children, correlate results with age, the Bristol stool scale, and stool frequency, and to evaluate intra- and interobserver variability.

METHODS

Inclusion criteria were as follows: healthy children between 3 and 18 years old with a normal defecation pattern, no history of abdominal surgery, and no medication use. Total and segmental CTT is measured by taking ten polythene radiopaque markers during six consecutive days followed by a single abdominal X-ray on day 7. Total and segmental CTT are calculated by multiplying the number of markers by 2.4 (Abrahamsson et al. Scand J Gastroenterol 32:72-80, 1988).

RESULTS

Fifty-four children and adolescents have participated: 30 boys and 24 girls (median age 10 years (3-18 years)). Median total CTT is 36 h (<2.4-86.4 h). There is no significant difference for age category (toddlers 31.2 h (<2.4-74.4 h), elementary school 36 h (2.4-79.2 h), and adolescents 43.2 h (14.4-86.4 h)). Segmental CTT reveals a median right colon CTT of 4.8 h (0-28.8 h); a median left colon CTT of 2.4 h (0-31.2 h); and a median rectosigmoidal CTT of 24 h (0-64.8 h). The Bristol stool scale correlates with total CTT (p = 0.031). The intra- and interobserver variability displays an ICC of 0.999 for the total CTT.

CONCLUSION

The CTT of normal healthy children is not sex- or age-related (above the age of 3 years). The Abrahamson method for CTT measurement by using bony landmarks for the determination of colon segments is easy to perform and well tolerated with a virtual inexistent rating difference between different observers.

Genome-wide copy number analysis uncovers a new HSCR gene: NRG3

Hirschsprung disease (HSCR) is a congenital disorder characterized by aganglionosis of the distal intestine. To assess the contribution of copy number variants (CNVs) to HSCR, we analysed the data generated from our previous genome-wide association study on HSCR patients, whereby we identified NRG1 as a new HSCR susceptibility locus. Analysis of 129 Chinese patients and 331 ethnically matched controls showed that HSCR patients have a greater burden of rare CNVs (p = 1.50×10⁻⁵), particularly for those encompassing genes (p = 5.00×10⁻⁶). Our study identified 246 rare-genic CNVs exclusive to patients. Among those, we detected a NRG3 deletion (p = 1.64×10⁻³). Subsequent follow-up (96 additional patients and 220 controls) on NRG3 revealed 9 deletions (combined p = 3.36×10⁻⁵) and 2 de novo duplications among patients and two deletions among controls. Importantly, NRG3 is a paralog of NRG1. Stratification of patients by presence/absence of HSCR–associated syndromes showed that while syndromic–HSCR patients carried significantly longer CNVs than the non-syndromic or controls (p = 1.50×10⁻⁵), non-syndromic patients were enriched in CNV number when compared to controls (p = 4.00×10⁻⁶) or the syndromic counterpart. Our results suggest a role for NRG3 in HSCR etiology and provide insights into the relative contribution of structural variants in both syndromic and non-syndromic HSCR. This would be the first genome-wide catalog of copy number variants identified in HSCR.

Copy number variations (CNVs) are significant genetic risk factors in disease pathogenesis and represent an important portion of missing heritability for some human diseases, making their discovery essential for the identification of genes and risk factors for a wide range of diseases, including Hirschsprung disease (HSCR, congenital colon aganglionosis). Since the discovery of the major HSCR gene, RET, a number of rare mutations have been reported in RET and other genes involved in the development of the enteric nervous system. However, these mutations contribute to only a small proportion of the disease susceptibility. Taking advantage of the recent technical and methodological advances, we have examined the contribution of CNVs to the disease. We have found that HSCR patients are enriched with CNVs encompassing genes. In particular, we found that deletions of NRG3, a paralog of the previously identified HSCR–susceptibility gene NRG1, were associated with the HSCR phenotype.