Bowel Management
The pediatric spinal cord-related dysfunction literature does not abound in manuscripts documenting prospective studies of neurogenic bowel management. In fact, a systematic review of the recent literature showed just 5 papers relevant to the subject. Briefly, the clinical management of the neurogenic bowel dysfunction associated with SCI involves utilization of mechanical, pharmacologic, and interventional methods. Mechanical methods include rectal stimulation and rectal evacuation (digital or enema); the pharmacologic agents utilized are either administered orally or rectally and can be classified as softeners or laxatives. The most common procedures helping with bowel evacuation in pediatric SCI include anterograde continent enema and colostomy.
Discussion
Only one paper described methods of bowel management in children with SCI (Goetz et al. 1998). Goetz et al. (1998) surveyed 33 individuals under age 19 with a diagnosis of SCI who received care in one medical center between 1985-1998. The average age at injury was 8.1 years and the average follow-up period was 3.9 years; 55% had tetraplegia and 77% had a complete injury (American Spinal Injury Association Class A). 81 % of them required performance of a bowel management program consisting of medications or manual manipulation, and only two were independent in their bowel management. Over half of the subjects performed their bowel care in the evening and over half performed it daily. Pharmacologic agents, either oral, rectal, or both, were used by 88% and mechanical methods (i.e., digital stimulation) tended to be used more commonly by younger children. A total of 60% of subjects reported they were completely or very satisfied with their bowel management. Among dissatisfying factors, limited freedom was reported in about 50% of participants and 68% reported occasional or frequent interference with school activities. 84% reported some accidents, but no correlation was found between bowel accidents and satisfaction with bowel management.
Vogel et al. (2002b) and Hwang et al. (2017) reported on long-term outcomes and longitudinal changes of neurogenic bowel management in adults with pediatric-onset SCI. Both studies examined the medical and psychosocial consequences of neurogenic bowel in individuals that suffered their SCI while they were children. Vogel et al. (2002b) surveyed 216 adult individuals who suffered their injury before 18 years treated at Shriner’s hospital. Bowel accidents were experienced by 135 subjects, with 19 having incontinence more frequently than once a month; the subjects who experienced bowel incontinence were older at interview and exhibited significantly lower American Spinal Injury Association Motor, Functional Independence Measure total, and motor scores. In total, 55 individuals complained of constipation, 37 experienced diarrhea and 73 complained of hemorrhoids or rectal bleeding. Individuals with bowel programs >60 min were significantly older at follow-up and had a longer duration of injury. Prolonged bowel programs were experienced by 42% of those with tetraplegia compared with 18% of those with paraplegia; those with prolonged bowel programs also had a lower mean American Spinal Injury Association Motor score and prolonged bowel programs were associated with significantly lower motor and total Functional Independence Measure scores. Hwang et al. (2017) performed a longitudinal cohort survey with an annual follow-up of 131 individuals who had sustained an SCI before the age of 19 years. They collected 466 interviews, with 75% of the participants contributing to at least 3 consecutive interviews. At first interview, rectal suppository/enema use was most common (51%). Over time, the likelihood of using manual evacuation, oral laxatives, and colostomy increased, whereas the odds of rectal suppository use decreased. Bowel evacuation times were likely to decrease over time in participants using manual evacuation and digital rectal stimulation but increase for rectal suppository/enema use. When the level of injury was controlled for, participants using manual evacuation and digital rectal stimulation were more likely to have increases in community participation scores.
The literature search identified two interventional studies, one describing the effectiveness of an implanted FES system on bladder and bowel function (Johnston et al. 2005) and the other looking at the use of the Peristeen transanal irrigation for 3 months (Midrio et al. 2016).
Johnston et al. (2005) studied three adolescents/young adult males with thoracic level complete (AIS A) paraplegia who underwent implantation of a 22-channel Praxis stimulator with 18 leads destined to stimulate muscles in the lower limbs and 4 leads meant to stimulate the bilateral S2-4 roots in order to modulate the bladder and bowel function. Electrical current parameters were: 0.2-8 mA amplitude, 25-600 μs pulse duration, and 2-500 Hz pulse frequency. Acute testing demonstrated that low-frequency electrical stimulation (20 Hz, 350 ms, 8 mA) of S3 bilaterally in one subject caused a significant increase in both rectal pressure and anal sphincter pressure. High-frequency stimulation alone (500 Hz, 350 ms, 8 mA) appeared to have no effect on rectal pressure and produced a reduced pressure in the anal sphincter as compared to low-frequency stimulation alone. A combination of low- and high-frequency (500 Hz, 350 ms, 8 mA) stimulation appeared to increase rectal and anal sphincter pressures, but to a level less than that caused by low-frequency stimulation alone. The investigators tested the daily use of electrical stimulation (about 18 hr/day) which appeared to cause a reduction in the time to complete defecation by 40% when only using low-frequency stimulation 30 seconds on and 30 seconds off for 5-10 min cycles and by 60% when 5-10 min of low-frequency stimulation was followed by 5 minutes of low/high-frequency stimulation. When compared to usual, routine bowel management without stimulation, there was a reduction in the proportion of days the subject failed to defecate and greater satisfaction with bowel management overall when using the electrical stimulation.
Midrio et al. (2016) studied 37 children with SCI age 6-11 (n=15) and 12-17 (n=22) who were trained to use the Peristeen transanal irrigation for 3 mo. The volume of water used was 10/20 ml/kg every day for the first week and then three times a week, increasing the amount of water as needed to a maximum of 1L. Outcome Measures were the Bristol Stool Scale, a questionnaire assessing bowel function, and 2 questionnaires assessing quality of life (one for each age group). Stool consistency was improved after 3 months of treatment with Peristeen transanal irrigation: before treatment, 77.5% of individuals with SCI presented with hard lumpy stools (types 1 and 2), and 2.5% presented with soft stools (type 4 and 5). After treatment, hard stools were recorded in 2.5% of individuals and soft stools in 82 %. The most common form of bowel dysfunction before treatment was constipation in 92.7% and fecal incontinence in 39% of individuals. After treatment, constipation was reduced to 41.5%, fecal incontinence to 9.8%, and flatus to 10 % (from 31.7%).
