Colorectal transport during defecation in patients with lesions of the sacral spinal cord

Diagnosis of colonic dysmotility associated with autonomic dysfunction in patients with chronic refractory constipation

We report the first study assessing human colon manometric features and their correlations with changes in autonomic functioning in patients with refractory chronic constipation prior to consideration of surgical intervention. High-resolution colonic manometry (HRCM) with simultaneous heart rate variability (HRV) was performed in 14 patients, and the resulting features were compared to healthy subjects. Patients were categorized into three groups that had normal, weak, or no high amplitude propagating pressure waves (HAPWs) to any intervention. We found mild vagal pathway impairment presented as lower HAPW amplitude in the proximal colon in response to proximal colon balloon distention. Left colon dysmotility was observed in 71% of patients, with features of (1) less left colon HAPWs, (2) lower left colon HAPW amplitudes (69.8 vs 102.3 mmHg), (3) impaired coloanal coordination, (4) left colon hypertonicity in patients with coccyx injury. Patients showed the following autonomic dysfunction: (1) high sympathetic tone at baseline, (2) high sympathetic reactivity to active standing and meal, (3) correlation of low parasympathetic reactivity to the meal with absence of the coloanal reflex, (4) lower parasympathetic and higher sympathetic activity during occurrence of HAPWs. In conclusion, left colon dysmotility and high sympathetic tone and reactivity, more so than vagal pathway impairment, play important roles in refractory chronic constipation and suggests sacral neuromodulation as a possible treatment.

Neurogenic Bowel and Management after Spinal Cord Injury: A Narrative Review

People with spinal cord injury (SCI) suffer from the sequela of neurogenic bowel and its disabling complications primarily constipation, fecal incontinence, and gastrointestinal (GI) symptoms. Neurogenic bowel is a functional bowel disorder with a spectrum of defecatory disorders as well as colonic and gastrointestinal motility dysfunction. This manuscript will review the anatomy and physiology of gastrointestinal innervation, as well as the pathophysiology associated with SCI. It will provide essential information on the recent guidelines for neurogenic bowel assessment and medical management. This will allow medical providers to partner with their patients to develop an individualized bowel plan utilizing a combination of various pharmacological, mechanical and surgical interventions that prevent complications and ensure successful management and compliance. For people with SCI and neurogenic bowel dysfunction, the fundamental goal is to maintain health and well-being, promote a good quality of life and support active, fulfilled lives in their homes and communities.

The Malone antegrade continence enema adapting a transanal irrigation system in patients with neurogenic bowel dysfunction

INTRODUCTION

Patients with severe neurogenic bowel dysfunction (NBD) may undergo the Malone antegrade continence enema (MACE) surgery to perform antegrade bowel irrigation (ABI). The standard approach may be prevented by a previous appendectomy or complicated by appendicular stenoses and/or stomal leakages. We present the experience by our tertiary referral center for NBD, adopting a modified surgical technique, based on a neoappendix with the terminal ileum to preserve the natural anti-reflux mechanism of the ileocecal valve and avoid stool leakage, and a largely available transanal irrigation (TAI) system to catheterize the neoappendix and perform ABI.

CASE PRESENTATION

Three individuals with NBD successfully underwent our modified MACE program. Case 1 had cauda equina syndrome. He underwent surgery at 40. Case 2 was a man who suffered from spinal cord dysfunction due to acute disseminated encephalomyelitis, functionally T12 AIS B, at 57. Case 3 was a man with traumatic L1 AIS B paraplegia. At 60 he underwent surgery after 29 years since the injury. He needed a surgical revision due to a postoperative subcutaneous infection. After 121, 84 and 14 months from surgery, the three individuals performed ABI every 2 days, presented functional stomas, had no fecal incontinence, and reported an NBD score of 6, compared to 40, 33 and 35 pre-operatively.

DISCUSSION

To our knowledge, this is the first report of MACE combining a tapered terminal ileum conduit and an adapted TAI system. Our approach proved to be a safe and effective strategy for severe NBD avoiding a colostomy.

The Monitoring Efficacy of Neurogenic Bowel Dysfunction Treatment on Response (MENTOR) in a Non-Hospital Setting

BACKGROUND

Most patients with a spinal cord injury (SCI) suffer from neurogenic bowel dysfunction (NBD). In spite of well-established treatment algorithms, NBD is often insufficiently managed. The Monitoring Efficacy of Neurogenic bowel dysfunction Treatment On Response (MENTOR) has been validated in a hospital setting as a tool to support clinical decision making in individual patients. The objective of the present study was to describe clinical decisions recommended by the MENTOR (either "monitor", "discuss" or "act") and the use of the tool to monitor NBD in a non-hospital setting.

METHODS

A questionnaire describing background data, the MENTOR, ability to work and participation in various social activities was sent by mail to all members of The Danish Paraplegic Association.

RESULTS

Among 1316 members, 716 (54%) responded, 429 men (61%) and 278 women (39%), aged 18 to 92 (median 61) years. Based on MENTOR, the recommended clinical decision is to monitor treatment of NBD in 281 (44%), discuss change in treatment in 175 (27%) and act/change treatment in 181 (28%). A recommendation to discuss or change treatment was associated with increasing age of the respondent (p = 0.016) and with impaired ability to work or participate in social activities (p < 0.0001).

CONCLUSION

A surprisingly high proportion of persons with SCI have an unmet need for improved bowel care. The MENTOR holds promise as a tool for evaluation of treatment of NBD in a non-hospital setting.

International standards to document remaining autonomic Function in persons with SCI and neurogenic bowel dysfunction: Illustrative cases

INTRODUCTION

Neurogenic bowel dysfunction (NBD) is a highly prevalent problem after spinal cord injury, with potential for significant impact on health and quality of life. The international standards to document remaining autonomic function after SCI were developed to standardize communication between professionals regarding neurogenic bowel and other autonomic function after SCI. To improve understanding of the bowel subsection, illustrative cases are presented.

CASE PRESENTATION

Three cases are presented which illustrate differences in presentation and scoring of the elements in the data set based upon varying injury severity and location.

DISCUSSION

Determination of neurologic level of injury is insufficient for assessment of autonomic function and there is no direct method of assessment. Hence, surrogate makers are needed. The bowel subsection of the International standards to document remaining autonomic function in persons with SCI is an easy-to-use tool for this purpose.

Neurogenic bowel dysfunction: Clinical management recommendations of the Neurologic Incontinence Committee of the Fifth International Consultation on Incontinence 2013

BACKGROUND

Evidence-based guidelines for the management of neurological disease and lower bowel dysfunction have been produced by the International Consultations on Incontinence (ICI). These are comprehensive guidelines, and were developed to have world-wide relevance.

AIMS

To update clinical management of neurogenic bowel dysfunction from the recommendations of the 4th ICI, 2009.

MATERIALS AND METHODS

A series of evidence reviews and updates were performed by members of the working group. The resulting guidelines were presented at the 2012 meeting of the European Association of Urology for consultation, and modifications applied to deliver evidence based conclusions and recommendations for the scientific report of the 5th edition of the ICI in 2013.

RESULTS

The current review is a synthesis of the conclusions and recommendations, including the algorithms for initial and specialized management of neurogenic bowel dysfunction. The pathophysiology is described in terms of spinal cord injury, multiple sclerosis, and Parkinson's disease. Assessment requires detailed history and clinical assessment, general investigations, and specialized testing, if required. Treatment primarily focuses on optimizing stool consistency and regulating bowel evacuation to improve quality of life. Symptom management covers conservative and interventional measures to promote good habits and assist stool evacuation, along with prevention of incontinence. Education is essential to achieving optimal bowel management.

DISCUSSION

The review offers a pragmatic approach to management in the context of complex pathophysiology and varied evidence base.

Ageing with neurogenic bowel dysfunction

STUDY DESIGN

Longitudinal study with postal survey.

OBJECTIVES

To describe changes in the patterns of neurogenic bowel dysfunction and bowel management in a population of people with spinal cord injury (SCI) followed for two decades.

SETTING

Members of the Danish SCI Association.

METHODS

In 1996, a validated questionnaire on bowel function was sent to the members of the Danish SCI Association (n=589). The same questionnaire was sent to all the surviving members in 2006 (n=284) and in 2015 (n=178). A total of 109 responded to both the 1996 and 2015 questionnaires.

RESULTS

Comparing data from 2015 with those from the exact same participants in 1996, the proportion of respondents needing more than 30 min for each defaecation increased from 21 to 39% (P<0.01), the use of laxatives increased (P<0.05) and the proportion considering themselves very constipated increased from 19 to 31% (P<0.01). In contrast, the proportion suffering from faecal incontinence remained stable at 18% in 1996 and 19% in 2015. During the 19-year period, there had been no significant change in the methods for bowel care, but 22 (20%) had undergone surgery for bowel dysfunction, including 11 (10%) who had some form of stoma.

CONCLUSION

Self-assessed severity of constipation increased but quality of life remained stable in a cohort of people with SCI followed prospectively for 19 years. Methods for bowel care remained surprisingly stable but a large proportion had undergone stoma surgery.

Constipation in parkinson's disease: Subjective symptoms, objective markers, and new perspectives

Constipation is among the first nonmotor symptoms to develop in the prodromal phase of PD. Pathological alpha-synuclein deposition is present throughout the gastrointestinal tract up to 20 years preceding diagnosis. Nevertheless, constipation in the context of PD remains ill defined and poorly understood. In this review, we summarize current knowledge of subjective symptoms and objective measures of constipation in PD. More than 10 different definitions of constipation have been used in the PD literature, making generalizations difficult. When pooling results from the most homogeneous studies in PD, a median constipation prevalence of 40% to 50% emerges, but with large variation across individual studies. Also, constipation prevalence tends to increase with disease progression. A similar prevalence is observed among patients with idiopathic rapid eye movement sleep behavior disorder. Interestingly, we detected a correlation between constipation prevalence in PD patients and healthy control groups in individual studies, raising concerns about how various constipation questionnaires are implemented across study populations. More than 80% of PD patients exhibit prolonged colonic transit time, and the same is probably true for de novo PD patients. Thus, the prevalence of objective colonic dysfunction exceeds the prevalence of subjective constipation. Colonic transit time measures are simple, widely available, and hold promise as a useful biomarker in manifest PD. More research is needed to elucidate the role of gastrointestinal dysfunction in disease progression of PD. Moreover, colonic transit measures may have utility as a more accurate risk factor for predicting PD in the prodromal phase. © 2016 International Parkinson and Movement Disorder Society.

Management of chronic constipation in adults

Chronic constipation (CC) is an extremely common condition with an estimated prevalence of up to 24%. Most patients with CC should be treated in primary care. Changes in lifestyle, including increased intake of dietary fibre, fluid, and exercise, should be attempted in most patients. Osmotic or stimulant laxatives are indicated if there are insufficient effects of lifestyle changes. Prokinetics and secretagogues should be restricted to those not responding to basic treatment. Anorectal physiology tests and assessment of colorectal transit time are indicated if medical treatment fails or if symptoms indicate severely obstructed defecation. If symptoms indicate an underlying structural disorder, barium or magnetic resonance evacuation proctography is indicated. Biofeedback therapy is effective in patients with dyssynergic defecation. In patients with other evacuation disorders, rectally administered laxatives or transanal irrigation should be attempted. Surgery is restricted to the minority of CC patients with very severe symptoms not responding to conservative treatment.

Quantification and variability in colonic volume with a novel magnetic resonance imaging method

BACKGROUND

Segmental distribution of colorectal volume is relevant in a number of diseases, but clinical and experimental use demands robust reliability and validity. Using a novel semi-automatic magnetic resonance imaging-based technique, the aims of this study were to describe: (i) inter-individual and intra-individual variability of segmental colorectal volumes between two observations in healthy subjects and (ii) the change in segmental colorectal volume distribution before and after defecation.

METHODS

The inter-individual and intra-individual variability of four colorectal volumes (cecum/ascending colon, transverse, descending, and rectosigmoid colon) between two observations (separated by 52 ± 10) days was assessed in 25 healthy males and the effect of defecation on segmental colorectal volumes was studied in another seven healthy males.

KEY RESULTS

No significant differences between the two observations were detected for any segments (All p > 0.05). Inter-individual variability varied across segments from low correlation in cecum/ascending colon (intra-class correlation coefficient [ICC] = 0.44) to moderate correlation in the descending colon (ICC = 0.61) and high correlation in the transverse (ICC = 0.78), rectosigmoid (ICC = 0.82), and total volume (ICC = 0.85). Overall intra-individual variability was low (coefficient of variance = 9%). After defecation the volume of the rectosigmoid decreased by 44% (p = 0.003). The change in rectosigmoid volume was associated with the true fecal volume (p = 0.02).

CONCLUSIONS & INFERENCES

Imaging of segmental colorectal volume, morphology, and fecal accumulation is advantageous to conventional methods in its low variability, high spatial resolution, and its absence of contrast-enhancing agents and irradiation. Hence, the method is suitable for future clinical and interventional studies and for characterization of defecation physiology.

Bowel dysfunction in spinal cord injury: current perspectives

Permanent disruptions of gastrointestinal function are very common sequel of spinal cord injury (SCI). When motor and sensory nervous integrity are severely affected, neurogenic gastrointestinal dysfunction is an inevitable consequence. Autonomic nervous system miss function has significantly diminished or lost sensory sensations followed with incomplete evacuation of stool from the rectal vault, immobility, and reduced anal sphincter tone all of those predisposing to increased risk of fecal incontinence (FI). The FI is, beside paralysis of extremities, one of the symptoms most profoundly affecting quality of life (QOL) in patients with SCI. We are reviewing current perspectives in management of SCI, discussing some pathophysiology mechanisms which could be addressed and pointing toward actual practical concepts in use for evaluation and improvements necessary to sustain SCI patients QOL.

A prospective trial of temporary sacral nerve stimulation for constipation associated with neurological disease

AIM

This study assessed the effectiveness of temporary sacral nerve stimulation (SNS) in patients with constipation associated with neurological disease using an off-on-off design, and evaluated the long-term response in patients undergoing permanent SNS.

METHOD

Patients with chronic constipation associated with neurological disease receiving specialist clinic care at the University Hospital North Durham over a 2-year period were recruited to a trial of SNS. Recordings of bowel function were made for 6 weeks (baseline) and a temporary electrode was then inserted and recordings were made for the next 3 weeks (stimulation). The electrodes were then removed and assessment was continued for a further 3 weeks (posttreatment). Patient-completed questionnaires were used to determine the severity of constipation (Global Assessment of Symptoms, Constipation, GA Constipation), symptoms (Patient Assessment of Constipation Symptoms score, PAC-SYM) and quality-of-life (Patient Assessment of Constipation-Quality Of Life score, PAC-QOL; European Quality of Life-Five-Domain score; European Quality of Life-Visual Analogue Score). Information was obtained on bowel function and medication. Physiological data were also available for transit and laser Doppler flow cytometry to measure mucosal blood flow.

RESULTS

Twenty-two patients were recruited, of whom 18 completed the trial. GA Constipation reduced significantly during temporary SNS: -1.09 (95% CI -1.59 to -0.59; P = 0.0003). PAC-SYM and PAC-QOL scores showed similar improvements. There was also a significant fall in the time spent in the toilet (P = 0.04) and a decrease in laxative use (P = 0.03). Twelve (67%) patients responded to temporary SNS and received a permanent implant with long-term success in 50%.

CONCLUSION

Sacral nerve stimulation can be effective in treating some patients with refractory severe neuroconstipation. A response to temporary SNS may predict long-term benefit in only half the patients undergoing permanent SNS.

Colorectal transport during defecation in subjects with supraconal spinal cord injury

STUDY DESIGN

Clinical study.

OBJECTIVES

To explore how supraconal spinal cord injury (SCI) affects colorectal emptying at defecation. Further, to relate findings to subject symptomatology expressed by bowel function scores and gastrointestinal transit time (GITT).

SETTING

Aarhus University Hospital, Denmark.

METHODS

Colorectal contents were marked by oral intake of (111)In-coated resin pellets. Movement of stools at defecation was assessed by comparing scintigrams performed before and just after defecation. Results from 15 subjects with SCI (14 males, median age=47 years (range: 22-74 years), SCI level: C5-Th9) were compared with those from 16 healthy volunteers (12 males, median age=31 years (range: 24-42 years)). Bowel symptoms were described from standard symptom scores, and GITT was assessed by radiopaque markers.

RESULTS

Median emptying at defecation was 31% of the rectosigmoid (range: 0% to complete emptying of the rectosigmoid and 49% of the descending colon) in subjects with SCI and 89% of the rectosigmoid (range: 53% to complete emptying of the rectosigmoid and the descending colon, and 3% of the transverse colon) in the control group (P<0.01). Colorectal emptying at defecation was associated with the St Mark's fecal incontinence score (P=0.02) but not with the Cleveland constipation score (P=0.17), the neurogenic bowel dysfunction score (P=0.12) or GITT (P=0.99).

CONCLUSION

Supraconal SCI results in significantly reduced emptying of stools at defecation. This is independent of changes in GITT.

[Transanal irrigation for bowel and anorectal management in spinal cord-injured patients]

OBJECTIVE

Bowel dysfunction and disordered defecation are very common after spinal cord injury (SCI) and can have a major impact on patients' social life and quality of life. The aim of this study was to assess the safety and efficacy of transanal irrigations (TAI) in the management of Bowel dysfunction in SCI patients.

METHODS

Forty-five consecutive SCI patients using TAI were retrospectively included. TAI efficacy was assessed through Neurogenic Bowel Dysfunction (NBD) score recorded before and after 8 weeks of regular use. Possible side effects were assessed with a semi-structured questionnaire. Patients who started TAI use at least 6 months previously were contacted to assess long-term compliance, efficacy and safety of TAI.

RESULTS

After 8 weeks of regular use of TAI, the average NBD scores decreased by four points (P<0.0001) with a specific improvement in the items related to stool frequency (P: 0.036), occurrence of malaise, headache, or sweating during defecation (P: 0.043), use of drugs against constipation (P: 0.007) and frequency of fecal incontinence (P: 0.001). The main side effects were bleeding (10%) and abdominal pain (8%). At 6 months, 80% of the assessed patients had continued regular use of TAI with no particular problem.

CONCLUSION

This study showed good medium and long-term efficacy and safety of TAI in the management of bowel dysfunction and defecation disorders in spinal cord-injured patients.

[Spinal cord injury and bowel function]

BACKGROUND

Spinal cord injury (SCI) often causes permanent disruptions of gastrointestinal function, which exacerbates functional disablement.

MATERIAL AND METHOD

The article is based on the authors' own clinical experience at tertiary level in the specialist health service and literature searches in PubMed.

RESULTS

Neurogenic gastrointestinal dysfunction is a common sequela of injury to the spinal cord. Obstipation and faecal incontinence entail treatment that is often time- and resource-consuming. It is not yet possible to treat the cause of the condition. New treatment methods with retrograde and antegrade irrigation of the rectocolon, transanally or by means of appendicostomy, result in a greater degree of self-sufficiency and faster evacuation procedures.

INTERPRETATION

Neurogenic gastrointestinal dysfunction following a spinal cord injury should be assessed and treated in a tertiary level rehabilitation department. The function loss is permanent, and the treatment must be systematically tested and regularly evaluated. The decision as to which treatment is appropriate has to be taken by the patient and the healthcare system. Individual and personal factors must be taken into account. The newly established international consensus, with standardised data sets for evaluating function loss due to spinal cord injuries, paves the way for new and greater possibilities for multi-centre cooperation on quality assurance and research.

Gastric and small intestinal dysfunction in spinal cord injury patients

BACKGROUND

Many patients with spinal cord injury (SCI) suffer from constipation, abdominal pain, nausea, or bloating, and colonic transit times are prolonged in most. Gastric and small intestinal dysfunction could contribute to symptoms but remain to be described in detail. Also, it is obscure whether the level of SCI affects gastric and small intestinal function.

AIM

To study orocecal transit time and gastric emptying (GE) in patients with SCI.

METHODS

Nineteen patients with SCI (7 ♀, median age 54 years) and 15 healthy volunteers (9 ♀, median age 32 years) were included. All were referred because of neurogenic bowel problems. Eleven patients had low SCI (located at conus medullaris or cauda equina) affecting only the parasympathetic nerves to the left colon and eight had high SCI (above Th6) affecting parasympathetic and sympathetic innervation. Subjects ingested a small magnetic pill that subsequently was tracked by the Motility Tracking System - MTS-1 (Motilis, Lausanne, Switzerland).

RESULTS

Orocecal transit time was longer than normal both in individuals with high lesions (P < 0.01) and in individuals with low lesions (P < 0.01). Individuals with high lesions had slower GE than those with conal/cauda equina lesions (P < 0.05). Basic contractile frequencies of the stomach and small intestine were unaffected by SCI.

CONCLUSION

Surprisingly, upper gastrointestinal transit is prolonged in subjects with SCI suffering from bowel problems, not only in subjects with cervical or high thoracic lesions but also in subjects with conal/cauda equina lesions. We speculate that this is secondary to colonic dysfunction and constipation.

Clinical concomitant benefits on pelvic floor dysfunctions after sacral neuromodulation in patients with incomplete spinal cord injury

OBJECTIVES

To assess the concomitant clinical improvement in incomplete spinal cord injury patients (SCIPs) suffering from neurogenic bowel symptoms (NBSs), neurogenic lower urinary tract symptoms (NLUTSs) and neurogenic erectile dysfunction (NED) using sacral neuromodulation (SNM) for NBSs and NLUTSs.

METHODS

Seventy-five SCIPs were selected. Before and during the follow-ups post-SNM, NLUTSs and NBSs were detected mainly through specific diaries. Erectile function was assessed using the International Index of Erectile Function composed of 5 questions (IIEF5). Quality of life (QoL) was measured with the Short Form 36 Health Survey questionnaire (SF-36). During the first stage, in which a permanent electrode was inserted percutaneously into the third sacral foramina and stimulated using an external generator, patients with NBSs or NLUTSs were required to improve their symptoms by at least 50% compared with baseline before proceeding to the second stage in which the generator was placed in the patient's buttock. NED patients needed to increase their IIEF5 score by at least 25% compared with baseline (evaluated initially 3 months after the second stage) in order to continue follow-up.

RESULTS

Fourteen out of 37 subjects who manifested two functional pelvic dysfunctions at baseline maintained notable clinical improvement in two pelvic functions (median follow-up >3 years). Six had non-obstructive retention (NOR) and NED, six double incontinence, and two constipation with NOR. In the general and mental health domains of the SF-36, all patients improved their scores by at least 20% compared with baseline.

CONCLUSIONS

SNM may be beneficial to selected incomplete SCIP with concomitant pelvic functional disturbances.

Poor outcome of sphincter repair: an evacuation problem?

INTRODUCTION

Colorectal transport in idiopathic fecal incontinence has scarcely been studied, and it remains to be investigated in patients with fecal incontinence and anal sphincter lesion. The aim of the present study was to compare colorectal transport during defecation in patients with idiopathic fecal incontinence and patients with fecal incontinence due to anal sphincter lesions with transport in healthy volunteers.

METHOD

Five women with idiopathic fecal incontinence (median age 72 years, range: 58-78 years) and five women with an obstetric sphincter lesion (median age 42 years, range: 28-63 years), four of whom had had previous anal sphincter repair, were compared with nine healthy female volunteers (median age 53 years, range 32-57 years). Colorectal scintigraphy was performed to assess colorectal emptying at defecation as well as segmental antegrade and retrograde transport during defecation. Segmental colorectal transit times were determined using radio-opaque markers.

RESULTS

Median colorectal emptying time at defecation was significantly lower in the sphincter lesion group compared with the healthy volunteers (P = 0.009). At defecation, median antegrade transport time from the ascending colon was significantly lower in the sphincter lesion group than in the healthy group (P = 0.02). The median segmental transit time from the rectosigmoid colon was higher in the group with a sphincter lesion than in the healthy group (P = 0.05). There were no statistically significant differences between the group with idiopathic fecal incontinence and the healthy volunteers.

CONCLUSION

Patients with fecal incontinence due to sphincter lesions, but not those with idiopathic fecal incontinence, have reduced transport from the cecum/ascending colon and from the rectosigmoid colon at defecation.

Transanal irrigation for disordered defecation: a systematic review

Transanal irrigation for treatment of disordered defecation has been widely used among caregivers. Unique in its simplicity, reversible and minimally invasive, transanal irrigation has begun to find its place in the treatment hierarchy. Scheduled transanal irrigation aims to ensure emptying of the left colon and rectum. This prevents faecal leakage between washouts, providing a state of pseudocontinence, and re-establishes control over the time and place of defecation. Furthermore, regular evacuation of the rectosigmoid prevents constipation. The studies presented in this review represent the continuum of increasing evidence and knowledge of transanal irrigation for disordered defecation: from proof in principle through better knowledge of the physiology, towards establishing the indications and ensuring the safety of the treatment. Evidence of the superiority of transanal irrigation in spinal cord injury patients with neurogenic bowel dysfunction is provided, also from a health-economic perspective. Finally, a proposal is presented for an algorithm for the introduction of transanal irrigation for disordered defecation before irreversible surgery is considered.

Transanal irrigation for the treatment of neuropathic bowel dysfunction

INTRODUCTION

Children with spinal cord lesions very often experience bowel dysfunction, with a significant impact on their social activities and quality of life. Our aim was to evaluate the efficacy of the Peristeen transanal irrigation (TI) system in patients with neuropathic bowel dysfunction (NBD).

MATERIAL AND METHODS

We prospectively reviewed 40 children with spina bifida and NBD who did not respond satisfactorily to conventional bowel management and were treated with the Peristeen TI system. Dysfunctional bowel symptoms, patient opinion and level of satisfaction were analysed before and during TI treatment using a specific questionnaire.

RESULTS

Thirty-five children completed the study. Mean patient age and follow up were 12.5 years (6-25) and 12 months (4-18), respectively. Average irrigation frequency and instillation volume were once every 3 days and 616ml (200-1000), respectively. Bowel dysfunction symptoms including faecal incontinence improved significantly in all children. Patient opinion of intestinal functionality improved from 2.3±1.4 to 8.2±1.5 (P<0.0001) and mean grade of satisfaction with the Peristeen system was 7.3. Patient independence also improved from 28 to 46% and no adverse events were recorded.

CONCLUSIONS

TI should be used as a first therapeutic approach in those children with NBD who do not respond to conservative or medical bowel management before other more invasive treatment modalities are considered. The Peristeen system is as effective as other TI methods, but it is easy to learn, safe and increases the patient's independence.

Review of the efficacy and safety of transanal irrigation for neurogenic bowel dysfunction

STUDY DESIGN

Neurogenic bowel dysfunction (NBD) is a common occurrence after spinal cord injury (SCI) and in patients with spina bifida or multiple sclerosis. The impact of NBD on well-being is considerable, affecting both physical and psychological aspects of quality of life. Transanal irrigation (TAI) of the colon promotes the evacuation of faeces by introducing water into the colon and rectum through a catheter inserted into the anus. Regular and controlled evacuation in this manner aims at preventing both constipation and faecal soiling.

OBJECTIVES

The aim of this study was to review current evidence for the efficacy and safety of TAI in patients with NBD.

MATERIALS AND METHODS

A literature search was conducted in PubMed. All identified papers were assessed for relevance based on the title and abstract; this yielded 23 studies that were considered to be of direct relevance to the topic of the review.

RESULTS

A multicentre, randomized, controlled trial has supported observational reports in demonstrating that TAI offers significant benefits over conservative bowel management in patients with SCI, in terms of managing constipation and faecal incontinence, reducing NBD symptoms and improving quality of life. Among other populations with NBD, TAI shows the greatest promise in children with spina bifida; however, further investigation is required. The overall safety profile of TAI is good, with few, and rare, adverse effects.

CONCLUSIONS

Building on the positive data reported for patients with SCI, continued evaluation in the clinical trial setting is required to further define the utility of TAI in other populations with NBD.

Rectal evacuation and antegrade colonic luminal transport by sacral anterior root stimulation in pigs

PURPOSE

Electrical sacral anterior root stimulation with a selective anodal block may relieve difficulties with bowel evacuation by selective colorectal activation and anal sphincter suppression. This study compares rectal evacuation induced by anodal block with that induced by unselective stimulation.

METHODS

The sacral anterior roots were stimulated with cuff electrodes in seven chloralose-anesthetized minipigs. Anodal block and unselective stimulation were applied in random order and compared by anorectal manometry and by the obtained colorectal evacuation. Evacuation was quantified scintigraphically after retrograde radioactive paste installation.

RESULTS

Unselective stimulation evoked sphincter activation which obstructed rectal evacuation during the 30-second stimulation period, after which poststimulation evacuation occurred (mean, 13%; P < 0.05). Anodal block reduced the anal canal pressure by median 83% compared with unselective stimulation. With unrestrained evacuation, a different evacuation pattern (mean, 18%; P < 0.05) occurred within the first ten seconds of the stimulation period and evacuated volume was higher (P = 0.08). Colonic evacuation reached a mean of 17% with unselective stimulation and 11% with anodal block.

CONCLUSION

Anodal block and unselective sacral root stimulation induce rectal evacuation and colonic luminal transport in pigs. However, anodal block may improve stimulation-induced defecation by enabling a near-physiologic defecation pattern.

Clinical outcome of sacral neuromodulation in incomplete spinal cord-injured patients suffering from neurogenic bowel dysfunctions

STUDY DESIGN

Retrospective study.

OBJECTIVES

Efficacy and safety of sacral neuromodulation (SNM) in incomplete spinal cord-injured patients (SCIPs) affected by chronic neurogenic bowel symptoms (NBSs).

SETTING

Neurourology Department. Primary to tertiary care.

METHODS

Retrospective non-blinded study without controls. Thirty-nine SCIPs were submitted to temporary stimulation for NBS. Permanent implantation was carried out if both their NBSs improved and the Wexner questionnaire scores were reduced by at least 50% during the first stage compared with that at baseline. Outcome measures included episodes of fecal incontinence and number of evacuations per week, as well as the Wexner score and the Short Form 36 (SF-36) Health Survey questionnaire.

RESULTS

Twenty-three SCIPs were submitted to definitive SNM, maintaining their clinical benefits after permanent implantation with a median follow-up of 38 months. The length of time since neurological diagnosis to SNM therapy represents the only factor related to the success of the implantation, P<0.05. In subjects with constipation (12), the median number of evacuations shifted from 1.65 to 4.98 per week, whereas the Wexner score changed from 19.91 to 6.82 in the final checkup with P<0.05. In subjects with fecal incontinence (11), the median number of episodes per week in the final follow-up was 1.32 compared with 4.55 pre-SNM. The general and mental health of both groups was measured with the SF-36 questionnaire and consistently showed statistical improvement (P<0.05).Anorectal manometry showed no important variation compared with baseline. There were no major complications.

CONCLUSIONS

SNM therapy should be considered for the treatment of NBS for select patients with incomplete spinal cord injury when conservative treatments fail.

Neurogenic bowel dysfunction: pathophysiology, clinical manifestations and treatment

Bowel dysfunction (e.g., fecal incontinence, infrequent or difficult defecation) are both frequent and severely troubling problems for patients with spinal cord injury, multiple sclerosis and Parkinson's disease. The etiology of these symptoms is complex; there may be autonomic and pelvic nerve dysfunction (with attenuation of voluntary motor function and impaired anorectal sensation and anorectal reflexes), or generalized systemic factors (e.g., altered diet and behavior, impaired mobility, psychological disturbances or drug adverse effects). The mainstay of current treatment is adapting a conservative approach towards reversing the systemic effects and optimizing the mechanics of defecation through the use of laxatives and irrigation approaches. When successful, this approach improves both evacuation and incontinence symptoms, with associated improvements in quality of life and independence. Future therapies may be directed at modulating pelvic innervation through electrical stimulation. Stoma formation remains an option for patients refractory to other approaches.

Neurogenic colorectal and pelvic floor dysfunction

Constipation and faecal incontinence are common symptoms among patients with spinal cord injury (SCI), myelomeningocoele (MMC), multiple sclerosis (MS), Parkinson's disease (PD) and stroke. Faecal incontinence in SCI, MMC and MS is mainly due to abnormal rectosigmoid compliance and rectoanal reflexes, loss of rectoanal sensibility and loss of voluntary control of the external anal sphincter. Constipation in SCI, MMC and MS is probably due to immobilisation, abnormal colonic contractility, tone and rectoanal reflexes or side effects from medication. In PD, dystonia of the external anal sphincter causes difficult rectal evacuation and the loss of dopaminergic neurons in the enteric nervous system probably causes slow-transit constipation. Changes after stroke remain to be studied. Though dietary adjustments, oral laxatives, suppositories and other conservative treatment modalities are commonly used, evidence for their use in patients with central neurological disorders is scarce. For patients with severe symptoms trans-anal irrigation, the Malone appendicostomy or a colostomy can be recommended.

Colorectal responses to distension and feeding in patients with spinal cord injury

The role of the central nervous system in enteroenteric motor reflexes remains controversial. Our aims were as follows: 1) to evaluate colorectal, rectocolic, gastrocolonic, and gastrorectal reflex responses in patients with cervical spinal cord injury (SCI) and 2) to compare these responses with those in healthy subjects. In six patients with SCI (5 male, 42 +/- 4 yr) and six healthy control subjects (5 male, 36 +/- 5 yr), 2-min phasic distensions were performed randomly via dual-barostat balloons in the colon and rectum. Continuous colonic and rectal balloon volumes were recorded during distensions and after a 1,000-kcal liquid meal. Mean balloon volumes were recorded before, during, and after phasic distensions and over 60 min postprandially. The colorectal response was similar in control subjects and SCI patients (rectal volume reduction = 28 +/- 11% and 15 +/- 5% in SCI patients and healthy subjects, respectively); the rectocolic response was variable. The gastrocolonic response was present in all subjects (colonic volume reduction = 49 +/- 4% and 44 +/- 3% in SCI patients and healthy subjects, respectively), with a time effect in the first 30 min (P < 0.0001) and a group effect in the second 30 min (P < 0.004). The gastrorectal response was present in four SCI patients and five healthy subjects (rectal volume reduction = 38 +/- 4% and 41 +/- 3% in SCI patients and healthy subjects, respectively), with a time effect in the first 30 min (P < 0.0001) but no group effect in the second 30 min. Intact neural transmission between the spinal cord and higher centers is not essential for normal colorectal motor responses to feeding and distension; however, a degree of central nervous system and neurohormonal modulation of these responses is likely.

Reproducibility and validity of radiographically determined gastrointestinal and segmental colonic transit times in spinal cord-injured patients

BACKGROUND

Total gastrointestinal transit times (GITT) and segmental colonic transit times (CTT) are commonly used to describe bowel function in individuals with spinal cord injury (SCI).

STUDY DESIGN

Reproducibility study.

OBJECTIVES

To describe inter- and intrasubjective as well as interobserver variations in GITT and segmental CTT in patients with SCI. Furthermore, to study associations between GITT or segmental CTT and colorectal symptoms.

SETTING

Spinal Cord Unit, Viborg Hospital, Denmark.

METHODS

Thirty SCI patients took 10 radio-opaque markers on 6 consecutive days and an abdominal X-ray was taken on day 7. The same procedure was repeated after 3 months. GITT and CTT were computed from the number of markers in the entire colorectum and in the left and the right colon. Intra- and interobserver variations were described as dispersion (numerical difference/mean).

RESULTS

Intersubjective variation was large for GITT (range: 0.6-6.3 days), right CTT (range: 0.1-5.5 days) and left CTT (range: 0-4.9 days). Intrasubjective variation was acceptable for GITT (dispersion: 0.28) but less good for right (dispersion: 0.63) and left CTT (dispersion: 0.68). Interobserver variation was very small. No correlations were found between GITT, right or left CTT and colorectal symptoms.

CONCLUSION

GITT and right and left CTT are of limited value for clinical decision-making in individual patients but may be useful for comparison of groups of patients with SCI.

Sacral nerve stimulation for faecal incontinence alters colorectal transport

Background

Sacral nerve stimulation reduces the frequency of defaecation in patients with faecal incontinence. The aim of this study was to examine the mechanism behind the reduced number of bowel movements in incontinent patients treated with sacral nerve stimulation.

Methods

The study included 20 patients with faecal incontinence and a positive percutaneous nerve evaluation test: 19 women and one man, with a median age of 63 (range 28–78) years. Colorectal scintigraphy was performed to assess colorectal emptying at defaecation before and after implantation. Segmental colorectal transit times were determined using radio-opaque markers.

Results

The median frequency of defaecation per 3 weeks decreased from 56 (range 19–136) to 26 (range 12–78) (P &lt; 0·002). At defaecation, antegrade transport from the ascending colon decreased from a median score of 8 (range 0–23) to 0 (range 0–11) per cent (P = 0·001), while retrograde transport from the descending colon increased from a median score of 0 (range 0–14) to 2 (range 0–30) per cent (P = 0·039). The median defaecation score was unchanged. There was a non-significant increase in median total gastrointestinal transit time from 2·5 (range 0·9–6·2) to 3·3 (range 0·8–6·2) days (P = 0·079).

Conclusion

Sacral nerve stimulation reduces antegrade transport from the ascending colon and increases retrograde transport from the descending colon at defaecation. This may prolong colonic transit time and increase the storage capacity of the colon.

A randomized, controlled trial of transanal irrigation versus conservative bowel management in spinal cord-injured patients

BACKGROUND & AIMS

Bowel dysfunction in patients with spinal cord injury often causes constipation, fecal incontinence, or a combination of both with a significant impact on quality of life. Transanal irrigation improves bowel function in selected patients. However, controlled trials of different bowel management regimens are lacking. The aim of the present study was to compare transanal irrigation with conservative bowel management (best supportive bowel care without irrigation).

METHODS

In a prospective, randomized, controlled, multicenter trial involving 5 specialized European spinal cord injury centers, 87 patients with spinal cord injury with neurogenic bowel dysfunction were randomly assigned to either transanal irrigation (42 patients) or conservative bowel management (45 patients) for a 10-week trial period.

RESULTS

Comparing transanal irrigation with conservative bowel management at termination of the study, the mean (SD) scores were as follows: Cleveland Clinic constipation scoring system (range, 0-30, 30 = severe symptoms) was 10.3 (4.4) versus 13.2 (3.4) (P = .0016), St. Mark's fecal incontinence grading system (range, 0-24, 24 = severe symptoms) was 5.0 (4.6) versus 7.3 (4.0) (P = .015), and the Neurogenic Bowel Dysfunction Score (range, 0-47, 47 = severe symptoms) was 10.4 (6.8) versus 13.3 (6.4) (P = .048). The modified American Society of Colorectal Surgeon fecal incontinence scores (for each subscale, range is 0-4, 4 = high quality of life) were: lifestyle 3.0 (0.7) versus 2.8 (0.8) (P = .13), coping/behavior 2.8 (0.8) versus 2.4 (0.7) (P = .013), depression/self perception 3.0 (0.8) versus 2.7 (0.8) (P = .055), and embarrassment 3.2 (0.8) versus 2.8 (0.9) (P = .024).

CONCLUSIONS

Compared with conservative bowel management, transanal irrigation improves constipation, fecal incontinence, and symptom-related quality of life.

Mechanisms controlling normal defecation and the potential effects of spinal cord injury

Spinal cord injury frequently leads to bowel dysfunction with the result that emptying the bowel can occupy a significant part of the day and reduce the quality of life. This chapter contains an overview of the function and morphology of the normal distal gut in the human, and of gut behaviour in normal defecation. In humans, this can be monitored and is described, but knowledge of the mechanisms controlling it is limited. Work on animals has shown that the intrinsic activity of the smooth muscles and their interactions with the enteric nervous system can program the activity that is necessary to expel waste material, but the external anal sphincter is controlled through somatic nerves. The gut however also receives input from the central nervous system through autonomic nerves, and a spinal reflex centre exists. Voluntary effort to induce defecation can influence all the control mechanisms, but the precise importance of each is not understood. The behaviour and properties of the individual muscles in the normal human rectum and anal canal are described, including their responses to intrinsic nerve stimulation and adrenergic and cholinergic agonists. The effects of established spinal cord injury are then considered. For convenience, supraconal and conal/cauda equina lesions are considered as two categories. Prolongation of transit times and disordered defecation are common problems. Supraconal lesions result in reduced resting anal pressures and increased risk of fecal incontinence. The acute effects of spinal cord injury are described, with injury causing ileus (prolonged total gastrointestinal transit times), constipation (prolonged colonic transit times) and fecal incontinence (passive leakage).

Neurogenic bowel dysfunction score

STUDY DESIGN

Cross-sectional questionnaire study.

OBJECTIVES

To develop and validate a symptom-based score for neurogenic bowel dysfunction (NBD): NBD score.

SETTING

University Hospital of Aarhus, Denmark.

METHODS

A questionnaire including questions about background parameters (n=8), faecal incontinence (n=10), constipation (n=10), obstructed defecation (n=8), and impact on quality of life (QOL) (n=3) was sent to 589 Danish spinal cord injured (SCI) patients. The reproducibility and validity of each item was tested in 20 and 18 patients, respectively. Associations between items and impact on QOL were determined by logistic regression analysis. The NBD score was constructed from items with acceptable reproducibility and validity that were significantly associated with impact on QOL. Based on odds ratios for associations between items and impact on QOL, each item was given a corresponding number of points in the NBD score.

RESULTS

A total of 424 SCI patients responded. The following 10 items met the criteria above: frequency of bowel movements (0-6 points), headache, perspiration or discomfort before or during defecation (0-2 points), tablets and drops against constipation (0-2 points each), time used for each defecation (0-7 points), frequency of digital stimulation or evacuation (0-6 points), frequency of faecal incontinence (0-13 points), medication against faecal incontinence (0-4 points), flatus incontinence (0-2 points) and perianal skin problems (0-3 points). Differences in NBD score among patients reporting no, little, some or major impact on QOL were statistically significant (all P<0.001).

CONCLUSION

Based on valid and reproducible questions, we have constructed a score for NBD that is correlated to impact on QOL.