Long-term results of total abdominal colectomy for chronic idiopathic constipation. Value of preoperative assessment

Slow-transit constipation and criteria for colectomy: a cross-sectional study of 1568 patients

Background

Colectomy remains a treatment option for a minority of patients with slow-transit constipation (STC) refractory to conservative treatment. However careful patient selection is essential to maximize benefits and minimize risk of adverse outcome. This study determined the proportion of patients with chronic constipation that would meet criteria for colectomy based on recent European graded practice recommendations derived by expert consensus.

Methods

Retrospective application of graded practice recommendations was undertaken on a prospectively maintained data set of consecutive adult patients with chronic constipation who underwent whole-gut transit studies using radio-opaque markers. Primary analysis applied contraindications achieving high level of expert consensus (normal whole-gut transit as an absolute contraindication and faecal incontinence as a relative contraindication for colectomy). Secondary analysis applied contraindications with less certain consensus.

Results

Primary analysis of 1568 patients undergoing a whole-gut transit study between January 2004 and March 2016 found 208 (13.3 per cent) met published criteria to be selected for colectomy, with 974 excluded for normal whole-gut transit and 386 for faecal incontinence. Secondary analysis demonstrated high prevalence of other relative contraindications to colectomy: 165 concomitant upper gastrointestinal symptoms, 216 abdominal pain (including 126 irritable bowel syndrome), and 446 evacuation disorder. The majority of patients (416 of 594) had two or more relative contraindications. If these patients were excluded, only 26 (1.7 per cent) chronically constipated patients retrospectively met selection criteria for colectomy.

Conclusions

The retrospective application of selection criteria is a limitation. However, the data highlight the high prevalence of factors associated with poor postoperative outcome and provide further caution to surgeons undertaking colectomy for STC.

Refractory Constipation: What is the Clinician to Do?

Most clinicians will agree that chronic constipation is characterized by abnormal bowel movement consistency and/or frequency plus or minus evacuation symptoms, but patient perception of constipation varies widely and includes symptoms that may or may not meet official defining criteria. Although intermittent constipation is extremely common, only a small minority of patients seek care for their symptoms. Among these patients, dissatisfaction with the currently available laxative options is not uncommon, and many patients will require specialized care for severe or refractory symptoms-especially those with abdominal pain, irritable bowel syndrome overlap, bloating or distention, and psychological comorbidities. This review outlines a physiological assessment of the patient with refractory constipation, exploring treatment options among patients with slow transit, rectal evacuation disorders, and normal transit. In addition, we explore nonlaxative approaches to normal-transit patients bothered by ongoing symptoms, with an emphasis on the biopsychosocial model of functional gastrointestinal disease and treatment of visceral hypersensitivity using neuromodulators. Finally, we propose a comprehensive evaluation algorithm for the management of patients with refractory slow-transit constipation considering surgery and examine surgical options including colectomy and cecostomy using an antegrade continent enema.

Surgery for constipation: systematic review and practice recommendations: Results I: Colonic resection

AIM

To assess the outcomes of colectomy in adults with chronic constipation (CC).

METHOD

Standardised methods and reporting of benefits and harms were used for all CapaCiTY reviews that closely adhered to PRISMA 2016 guidance. Main conclusions were presented as summary evidence statements (SES) with a summative Oxford Centre for Evidence-Based Medicine (2009) level.

RESULTS

Forty articles were identified, providing data on outcomes in 2045 patients. Evidence was derived almost exclusively from observational studies, the majority of which concerned colectomy and ileorectal anastomosis (CIRA) rather than other procedural variations. Average length of stay (LOS) ranged between 7-15 days. Although inconsistent, laparoscopic surgery may be associated with longer mean operating times (210 vs 167 min) and modest decreases in LOS (10-8 days). Complications occurred in approximately 24% of patients. Six (0.4%) procedure-related deaths were observed. Recurrent episodes of small bowel obstruction occurred in about 15% (95%CI: 10-21%) of patients in the long-term, with significant burden of re-hospitalisation and frequent recourse to surgery. Most patients reported a satisfactory or good outcome after colectomy but negative long-term functional outcomes persist in a minority of patients. The influence of resection extent, anastomotic configuration and method of access on complication rates remains uncertain. Available evidence weakly supports selection of patients with an isolated slow-transit phenotype.

CONCLUSION

Colectomy for CC may benefit some patients but at the cost of substantial short- and long-term morbidity. Current evidence is insufficient to guide patient or procedural selection.

慢传输型便秘外科治疗进展

近年来, 慢性便秘呈缓慢上升趋势, 慢传输型便秘(slow transit constipation, STC)是慢性便秘最常见的一种类型, 外科治疗是STC治疗的重要手段. 由于目前对于STC的发病原因及发病机制尚未完全明确, 及术前缺乏精确定位病变结肠的检查方法, 导致治疗STC手术方法的多样性. 近三十年来, 随着医学技术的不断进步, STC的外科治疗不断发展, 手术方法不断创新; 手术方法经历了从简单到复杂再到个体化选择, 从单一手术方法到多种手术方法选择, 从经腹开放手术到腹腔镜微创手术. 本文从STC的术式产生和发展过程来阐述STC外科治疗疗效和进展.

Comparison of laparoscopic subtotal colectomy with posterior vaginal suspension and laparoscopic subtotal colectomy with transvaginal repair for patients with slow-transit constipation complicated with rectocele: a non-randomized comparative study in a single center

BACKGROUND

Slow-transit constipation complicated with rectocele is a mixed constipation difficult to treat by surgery. Different hospitals and surgeons may employ different surgical procedures. The present study aims to compare the efficacy of laparoscopic subtotal colectomy (LSC) with posterior vaginal suspension and LSC with transvaginal repair for patients having refractory slow-transit constipation complicated with rectocele.

METHODS

This paper is a retrospective study of 64 patients having refractory slow-transit constipation complicated with rectocele. Admitted from January 2002 to December 2012, the 64 patients were non-randomly divided into two groups: patients who underwent LSC with posterior vaginal suspension (Group A, 36 patients) and patients who underwent LSC with transvaginal repair (Group B, 28 patients).

RESULTS

There was no statistically significant difference (P > 0.05) in preoperative general characteristics and Wexner constipation score between Group A and Group B. There was no statistically significant difference (P > 0.05) in operative time and intraoperative blood loss between the two groups. One month after the surgery, there was no statistically significant difference (P > 0.05) in early postoperative complications, constipation recurrence rate, degree of improvement in constipation symptoms, and Wexner constipation score between the two groups. But 1-year follow-up results show that there was statistically significant difference (P < 0.05) in constipation recurrence rate, gastrointestinal quality of life index, the degree of improvement in constipation symptoms, and Wexner constipation score between the two groups.

CONCLUSION

Compared with the LSC with transvaginal repair, the LSC with posterior vaginal suspension demonstrated better efficacy in treating refractory slow-transit constipation complicated with rectocele.

Colectomy for slow transit constipation: effective for patients with coexistent obstructed defecation

BACKGROUND

Patient selection is a crucial step when considering total abdominal colectomy and ileorectal anastomosis (TAC/IRA) for refractory constipation.

PURPOSE

This study aimed to evaluate the results of short- and long-term outcomes for patients with pure slow transit constipation (STC) compared to those with slow transit and features of obstructive defecation (STC + OD).

METHODS

This study included all patients who underwent TAC/IRA for constipation from 1999-2010. Patients were divided into two groups: group A (STC) and group B (STC + OD) based on abnormal physiology or motility testing in addition to the surgeon's clinical impression of symptomatic obstructive defecation. Demographics, operative variables, and short-term outcomes were collected by retrospective chart review and were compared between groups. Long-term functional outcomes were assessed by telephone survey. This included: number of bowel movements, use of laxatives, antidiarrheal medications, and surgery satisfaction. Validated questionnaires were collected postoperatively.

RESULTS

One hundred forty-four patients (143 females; mean age, 40 (18-68) years old) underwent TAC/IRA by either laparoscopic (63 (44 %)) or open (81 (56 %)) techniques. One hundred three patients had pure STC and 41 had STC + OD. Four patients underwent TAC with end ileostomy at first procedure. Seven patients underwent surgery after a trial of diverting ileostomy. One patient died unexpectedly, 2 days after uneventful surgery. Median follow-up was 43 (IQR, 16-75) months. Five (5 %) patients in group A and two (5 %) in group B underwent subsequent ileostomy for poor functional outcomes. Eighty-eight (68 %) patients were available by telephone. Short- and long-term outcomes were equivalent in both groups as well as patient satisfaction (89 vs. 85 %, p = 0.7).

CONCLUSIONS

Total abdominal colectomy can be offered to selective patients with slow transit constipation and obstructive defecation with equivalent long-term results.

Consensus statement AIGO/SICCR diagnosis and treatment of chronic constipation and obstructed defecation (part II: treatment)

The second part of the Consensus Statement of the Italian Association of Hospital Gastroenterologists and Italian Society of Colo-Rectal Surgery reports on the treatment of chronic constipation and obstructed defecation. There is no evidence that increasing fluid intake and physical activity can relieve the symptoms of chronic constipation. Patients with normal-transit constipation should increase their fibre intake through their diet or with commercial fibre. Osmotic laxatives may be effective in patients who do not respond to fibre supplements. Stimulant laxatives should be reserved for patients who do not respond to osmotic laxatives. Controlled trials have shown that serotoninergic enterokinetic agents, such as prucalopride, and prosecretory agents, such as lubiprostone, are effective in the treatment of patients with chronic constipation. Surgery is sometimes necessary. Total colectomy with ileorectostomy may be considered in patients with slow-transit constipation and inertia coli who are resistant to medical therapy and who do not have defecatory disorders, generalised motility disorders or psychological disorders. Randomised controlled trials have established the efficacy of rehabilitative treatment in dys-synergic defecation. Many surgical procedures may be used to treat obstructed defecation in patients with acquired anatomical defects, but none is considered to be the gold standard. Surgery should be reserved for selected patients with an impaired quality of life. Obstructed defecation is often associated with pelvic organ prolapse. Surgery with the placement of prostheses is replacing fascial surgery in the treatment of pelvic organ prolapse, but the efficacy and safety of such procedures have not yet been established.

Consensus statement AIGO/SICCR diagnosis and treatment of chronic constipation and obstructed defecation (Part II: Treatment)

The second part of the Consensus Statement of the Italian Association of Hospital Gastroenterologists and Italian Society of Colo-Rectal Surgery reports on the treatment of chronic constipation and obstructed defecation. There is no evidence that increasing fluid intake and physical activity can relieve the symptoms of chronic constipation. Patients with normal-transit constipation should increase their fibre intake through their diet or with commercial fibre. Osmotic laxatives may be effective in patients who do not respond to fibre supplements. Stimulant laxatives should be reserved for patients who do not respond to osmotic laxatives. Controlled trials have shown that serotoninergic enterokinetic agents, such as prucalopride, and prosecretory agents, such as lubiprostone, are effective in the treatment of patients with chronic constipation. Surgery is sometimes necessary. Total colectomy with ileorectostomy may be considered in patients with slow-transit constipation and inertia coli who are resistant to medical therapy and who do not have defecatory disorders, generalised motility disorders or psychological disorders. Randomised controlled trials have established the efficacy of rehabilitative treatment in dys-synergic defecation. Many surgical procedures may be used to treat obstructed defecation in patients with acquired anatomical defects, but none is considered to be the gold standard. Surgery should be reserved for selected patients with an impaired quality of life. Obstructed defecation is often associated with pelvic organ prolapse. Surgery with the placement of prostheses is replacing fascial surgery in the treatment of pelvic organ prolapse, but the efficacy and safety of such procedures have not yet been established.

Consensus statement AIGO/SICCR diagnosis and treatment of chronic constipation and obstructed defecation (part II: treatment)

The second part of the Consensus Statement of the Italian Association of Hospital Gastroenterologists and Italian Society of Colo-Rectal Surgery reports on the treatment of chronic constipation and obstructed defecation. There is no evidence that increasing fluid intake and physical activity can relieve the symptoms of chronic constipation. Patients with normal-transit constipation should increase their fibre intake through their diet or with commercial fibre. Osmotic laxatives may be effective in patients who do not respond to fibre supplements. Stimulant laxatives should be reserved for patients who do not respond to osmotic laxatives. Controlled trials have shown that serotoninergic enterokinetic agents, such as prucalopride, and prosecretory agents, such as lubiprostone, are effective in the treatment of patients with chronic constipation. Surgery is sometimes necessary. Total colectomy with ileorectostomy may be considered in patients with slow-transit constipation and inertia coli who are resistant to medical therapy and who do not have defecatory disorders, generalised motility disorders or psychological disorders. Randomised controlled trials have established the efficacy of rehabilitative treatment in dys-synergic defecation. Many surgical procedures may be used to treat obstructed defecation in patients with acquired anatomical defects, but none is considered to be the gold standard. Surgery should be reserved for selected patients with an impaired quality of life. Obstructed defecation is often associated with pelvic organ prolapse. Surgery with the placement of prostheses is replacing fascial surgery in the treatment of pelvic organ prolapse, but the efficacy and safety of such procedures have not yet been established.

Prospective randomized double-blind study of temporary sacral nerve stimulation in patients with rectal evacuatory dysfunction and rectal hyposensitivity

OBJECTIVE

Prospective randomized double-blind placebo-controlled crossover trial of 14 female patients (median age 52 [30-69] years) with proctographically defined evacuatory dysfunction (ED) and demonstrable rectal hyposensitivity (elevated thresholds to balloon distension in comparison with age- and sex-matched controls).

BACKGROUND

Sacral nerve stimulation (SNS) is an evolving treatment for constipation. However, variable outcomes might be improved by better patient selection. Evidence that the effect of SNS may be mediated by modulation of afferent signaling promotes a role in patients with ED associated with rectal hyposensation.

METHODS

SNS was performed by the standard 2-stage technique (temporary then permanent implantation). During a 4-week period of temporary stimulation, patients were randomized ON-OFF/OFF-ON for two 2-week periods. Before insertion (PRE), and during each crossover period, primary (rectal sensory thresholds) and secondary (bowel diaries, constipation, and GIQoL [gastrointestinal quality of life] scores) outcome variables were blindly assessed.

RESULTS

Thirteen patients completed the trial. Following stimulation, defecatory desire volumes to rectal balloon distension were normalized in 10 of 13 patients (PRE: mean 277 mL [234-320] vs ON: 163 mL [133-193] vs OFF: 220 mL [183-257 mL]; P = 0.006) and maximum tolerable volume in 9 of 13 (PRE: mean 350 mL [323-377] vs ON: 262 mL [219-305] vs OFF: 298 mL [256-340 mL]; P = 0.012). There was a significant increase in the percentage of successful bowel movements (PRE: median 43% [0-100] vs ON: 89% [11-100] vs OFF: 83% [11-100]; P = 0.007) and Wexner constipation scores improved (PRE: median 19 [9-26] vs ON: 10 [6-27] vs OFF: 13 [5-29]; P = 0.01). There were no significant changes in disease-specific or generic quality of life measures. Eleven patients progressed to permanent stimulation (9/11 success at 19 months).

CONCLUSIONS

Most patients with chronic constipation secondary to ED with rectal hyposensitivity responded to temporary SNS. The physiological results presented support a mechanistic role for rectal afferent modulation.

Systematic review of abdominal surgery for chronic idiopathic constipation

AIM

Constipation is a common problem which increases in prevalence with age. Chronic constipation is complex and difficult to treat. Some patients will not respond to pharmacological therapy and therefore surgery may be considered. A systematic review of the literature was performed to determine the outcome of surgery.

METHOD

Published papers were identified by a search of The Cochrane Library, MEDLINE, CINAHL and EMBASE. They were reviewed and the data were extracted.

RESULTS

Forty-eight papers were identified, including 1443 patients. Eleven different procedures were described. There was inconsistency in reporting. In 65% of patients the mean frequency of defaecation increased from 1.1 to 19.7 evacuations per week. Where laxative usage was reported (971 patients), it was found that 88% of patients did not need them postoperatively. Early complications included ileus (0-16%), infection (0-13%) and anastomotic leakage (0-22%). Patient satisfaction and quality of life scores were high. Only 30% of studies included data on preoperative psychological assessment.

CONCLUSION

Surgery improves constipation and is associated with a higher degree of patient satisfaction, but the quality of studies was very variable. Future controlled trials should examine the ideal therapeutic approach for different patient groups.

Gastrointestinal neuromuscular pathology in chronic constipation

Some patients with chronic constipation may undergo colectomy yielding tissue appropriate to diagnosis of underlying neuromuscular pathology. The analysis of such tissue has, over the past 40 years, fueled research that has explored the presence of neuropathy, myopathy and more recently changes in interstitial cells of Cajal (ICC). In this chapter, the data from these studies have been critically reviewed in the context of the significant methodological and interpretative issues that beset the field of gastrointestinal neuromuscular pathology. On this basis, reductions in ICC appear to a consistent finding but one whose role as a primary cause of slow-transit constipation requires further evaluation. Findings indicative of significant neuropathy or myopathy are variable and in many studies subject to considerable methodological bias. Methods with practical diagnostic utility in the individual patient have rarely been employed and require further validation in respect of normative data.

Sexual abuse: a strong predictor of outcomes after colectomy for slow-transit constipation

PURPOSE

This study was designed to determine the impact of a history of sexual abuse on the outcomes of ileorectal anastomosis for slow-transit constipation.

METHODS

All patients undergoing subtotal colectomy and ileorectal anastomosis for slow-transit constipation by a single surgeon at a university hospital from 1991 to 2006 were identified. Age, time since surgery, psychiatric diagnoses, number of previous operations, and "functional" disorders were collected. Patients were questioned about a history of anal and vaginal sexual abuse. Use of alternative healthcare practitioners and remote postoperative physician visits for abdominal symptoms were elicited.

RESULTS

Fifteen patients met study criteria, and 13 came for assessment. All were women, all were highly satisfied with the results of their surgery, and all said they would request the procedure again. Median age was 38 (range, 29-58) years, and time to follow-up was 97 (range, 25-166) months. Eleven subjects (85%) reported a current psychiatric condition being treated with psychotropic medication. Eight (62%) reported a history of sexual abuse, and seven (88%) reported both anal and vaginal abuse. Patients with a history of sexual abuse had a total of 32 operations before colectomy and 30 functional diagnoses, compared with a total of 3 operations and 3 functional diagnoses in the nonabused group (P = 0.001 and P = 0.0002, respectively). Similarly, seven of eight abused patients (88%) sought additional medical care for abdominal complaints after this surgery, compared with none of five in the nonabused group (P = 0.005).

CONCLUSION

A history of sexual abuse should be sought in patients with slow-transit constipation, because it is a strong predictor of more functional diagnoses, more precolectomy operations, and more postcolectomy medical care for abdominal complaints.

Postoperative course and long term follow up after colectomy for slow transit constipation--is surgery an appropriate approach?

OBJECTIVE

Patients with slow transit constipation who do not respond satisfactorily to common medical treatment are considered candidates for colectomy. The present observational long term study was designed to assess outcome after surgery.

METHOD

Twenty consecutive patients were treated by colectomy for slow transit constipation between 1996 and 2004. Preoperative and postoperative data were reviewed by using our institutional database. A questionnaire including validated scoring systems and questions about complications and subsequent surgical interventions was sent to all available patients.

RESULTS

Three patients (15%) died perioperatively. Median long term follow up was 84 months. Ten patients (50%) needed further operations after colectomy: Three patients (15%) had surgery during the early postoperative period, seven patients (35%) during follow up. A total of 31 operations had to be performed in these patients. Twelve patients (86%) responded to the questionnaires. Their median Wexner constipation score was 11.5 (range 8-23). Six patients fulfilled the Rome II criteria for constipation. The median Vaizey incontinence score was 7.5 (range 0-22). The median GIQLI showed 80 points (range 32-129).

CONCLUSION

Morbidity and mortality rate after colectomy were inadmissibly high. Taking into account the poor functional results, we cannot recommend colectomy for slow transit constipation.

Subtotal colectomy with antiperistaltic cecoproctostomy for selected patients with slow transit constipation-from Chinese report

BACKGROUND AND AIMS

Total abdominal colectomy with ileorectal anastomosis (TAC-IRA) is recommended widely for the patients with severe, refractory slow transit constipation (STC). Subtotal colectomy with end-to-end antiperistaltic cecorectal anastomosis (Sarli procedure), an alternative for STC, has been paid particular attention. The purpose of this study was to retrospectively compare alterations of clinical functions and qualities of life between TAC-IRA and Sarli procedure.

METHODS

Seventeen patients with STC who underwent Sarli procedure and 20 patients with STC who underwent TAC-IRA were chosen for this study. Patient characteristics, operative data, postoperative data, alterations of clinical function, and quality of life were compared. The gastrointestinal quality of life index (GIQLI) survey was used to evaluate postoperative qualities of life.

RESULTS

At the mean 4-year follow-up (range 2-6 years), the frequency of daily bowel movement in the Sarli group was significantly less than that in the TAC-IRA group (2.4 +/- 0.9 vs. 3.4 +/- 0.8; P = 0.0014), and the Wexner continence scores were significantly lower in the Sarli group compared to the TAC-IRA group (4.3 +/- 1.8 vs. 5.8 +/- 1.9; P = 0.0223). However, the GIQLI score in Sarli group was higher than the TAC-IRA group (119.8 +/- 7.5 vs. 111.1 +/- 12.0, P = 0.0455). Post subtotal colectomy barium enema showed a sign of "reservoir" at the residual ascending colon and cecum.

CONCLUSIONS

Compared to the TAC-IRA, subtotal colectomy with end-to-end antiperistaltic cecoproctostomy for appropriately selected patients with STC resulted in relief of constipation, satisfactory functional outcome, and improved qualities of life.

Surgical treatment of patients with constipation and fecal incontinence

Patients with constipation and fecal incontinence usually come to the attention of the surgeon when conservative measures have failed to alleviate sufficiently severe symptoms. Following detailed clinical and physiologic assessment, the surgeon should tailor the procedure to specific underlying physiologic abnormalities to restore function. This article describes the rationale, indications (including patient selection), results, and current position controversies of surgical procedures for constipation and fecal incontinence, dividing these into those regarded as historical, contemporary, or evolving. Reported surgical outcome data must be interpreted with caution because for most studies the evidence is of low quality, making comparison of different procedures problematic and emphasizing the need for better designed and conducted clinical trials.

Anorectal physiologic evaluation of constipation

Chronic constipation is a widespread problem which affects approximately 63 million people in North America alone. Although the majority of patients respond to changes in dietary fiber and water intake, as well as the judicious use of laxatives, a small portion will not and as a result, will be evaluated by gastroenterologists and colorectal surgeons. These patients most frequently have slow transit constipation, pelvic floor dysfunction, or some combination of the two. The physiologic evaluation of these patients comprises colonic transit studies, anorectal manometry, cinedefecography, electromyography, and pudendal nerve terminal motor latency testing. In this article, the authors describe the physiologic basis for these studies and review the techniques used in diagnosing these conditions.

Slow transit constipation: a review of a colonic functional disorder

Constipation is a common gastrointestinal complaint that can cause significant physical and psychosocial problems. It has been categorized as slow transit constipation, normal transit constipation, and obstructed defecation. Both the definition and pathophysiology of constipation are unclear, but attempts to describe each of the three types have been made. Slow transit constipation, a functional colonic disorder represents approximately 15 to 30% of constipated patients. The theorized etiologies are disorders of the autonomic and enteric nervous system and/or a dysfunctional neuroendocrine system. Slow transit constipation can be diagnosed with a complete history, physical exam, and a battery of specific diagnostic studies. Once the diagnosis is affirmed and medical management has failed, there are several treatment options. Biofeedback, sacral nerve stimulation, segmental colectomy, and subtotal colectomy with various anastomoses have all been used. Of those treatment options, a subtotal colectomy with ileorectal anastomosis is the most efficacious with the data to support its use.

Anorectal manovolumetry in the decision making before surgery for slow transit constipation

BACKGROUND

Colectomy with ileorectal anastomosis for slow transit constipation (STC) is being challenged by other operations, such as segmental resections. The importance of preoperative anorectal physiology testing may therefore be increased. The aim of this study was to identify anorectal abnormalities in patients with STC, which may influence the surgical approach.

METHODS

Fifty consecutive patients with STC (43 women; median age, 49 years) and 28 controls (23 women; median age, 50 years) were examined with anorectal manovolumetry. Anal pressures and rectal volumes were recorded, at stepwise rectal distension.

RESULTS

Anal resting pressure was lower in patients (median, 54 cm H(2)O; range, 22-130) than in controls (median, 68 cm H(2)O; range, 35-100) (p<0.05). Squeeze pressure tended to be lower in patients (median, 147 cm H(2)O; range, 53-382) than in controls (median, 177 cm H(2)O; range, 65-423) (p=0.09). Rectal sensory thresholds did not differ significantly between patients and controls, although 10 patients had a threshold for filling above the 95(th) percentile of controls. Rectal compliance was increased in patients in the pressure interval 5-35 cm H(2)O (p<0.05-0.01). The threshold and amplitude of the recto-anal inhibitory reflex did not differ significantly, but the recovery of resting pressure after eliciting the reflex was lower in patients than in controls in the pressure interval 10-50 cm H(2)O (p<0.05-0.001).

CONCLUSIONS

More than half of the patients with STC deviated in some parameter. An impaired internal sphincter function and increased rectal compliance were seen. One fifth of the patients had impaired rectal sensation.

Slow-transit constipation: evaluation and treatment

Slow-transit constipation is characterized by delay in transit of stool through the colon, caused by either myopathy or neuropathy. The severity of constipation is highly variable, but may be severe enough to result in complete cessation of spontaneous bowel motions. Diagnostic tests to assess colonic transit include radiopaque marker or radioisotope studies, and intraluminal tests (colonic and small bowel manometry). Most patients with functional constipation respond to laxatives, but a small proportion are resistant to this treatment. In some patients biofeedback is helpful although the mechanism by which this works is still uncertain. Other patients are resistant to all conservative modes of therapy and require surgical intervention. Extensive clinical and physiological preoperative assessment of patients with slow colonic transit is essential before considering surgery, including an assessment of small bowel motility and identification of coexistent obstructed defecation. The psychological state of the patient should always be taken into account. When surgery is indicated, subtotal colectomy and ileorectal anastomosis is the operation of choice. Segmental colonic resection has been reported in a few patients, but methods of identifying the affected segment need to be developed further. Less invasive and reversible surgical options include laparoscopic ileostomy, antegrade colonic enema and sacral nerve stimulation.

Surgery for slow transit constipation: are we helping patients?

INTRODUCTION

Long-term outcome after surgery for slow transit constipation is conflicting. The aim of this study was to assess long-term quality of life after surgery.

METHODS

The medical records of all patients undergoing colectomy with ileorectal anastomosis between 1983 and 1998 were evaluated. Preoperative, operative, and postoperative details were recorded. A survey was conducted to evaluate current symptoms and health. Quality of life was assessed using the short-form (SF)-36 survey.

RESULTS

Sixty-nine (2 male) patients were identified. Five were deceased. Mean age at surgery was 38.6 years (range, 19.7-78.8 years). Median follow-up after surgery was 10.8 years (range, 5.1-18.6 years). Forty-one percent had a family history of constipation. Eleven (16%) had an ileus postoperatively, which responded to medical therapy. One patient had a leak that required temporary diversion. Long-term complications occurred in 32 (46%) patients, which included hernias (3 patients; 4%), pelvic abscess (1 patient; 1.5%), rectal pain (1 patient; 1.5%), small-bowel obstruction (14 patients; 20%, with eight requiring surgery), diarrhea (5 patients; 7%), incontinence (1 patient, 1.5%), and persistent constipation (6 patients; 9%). Fifty-five percent (35/64) responded to a questionnaire. Overall, 25 of 35 (77% of the respondents) stated that surgery was beneficial. Sixty-four percent of patients have semisolid stools, 35% have liquid stools, and 4% reported hard stool. Results of the SF-36 showed the physical component score was comparable with healthy individuals. However, the mental component score was low especially in the areas of vitality (median, 45) and social functioning (median, 37).

CONCLUSION

Surgery for constipation is not perfect, and preoperative symptoms may persist after surgery. When assessing long-term quality of life, the mental component of the SF-36 was low compared with the general population, and the physical component was similar. Moreover, because 77% report long-term improvement, surgery is beneficial for appropriate patients.

Surgery for constipation

Patients with intractable chronic constipation should be evaluated with physiologic tests after structural disorders and extracolonic causes have been excluded. Conservative treatment options should be tried excessively. If surgery is indicated subtotal colectomy with IRA is the treatment method of choice. However, segmental resection may be a good option for isolated megasigmoid, sigmoidocele or recurrent sigmoid volvulus. In general patients with GID should not be offered any surgical options because of their anticipated poor results. Moreover, patients with psychiatric disorders should be actively discouraged from resection as they tend to have poorer prognosis. Patients must be counseled that preoperative pain and/or bloating will likely persist even if surgery normalizes bowel frequency. Patients with associated problems may be better served by having a stoma without resection as both a therapeutic maneuver and a diagnostic trial. Colectomy is no option to treat pain and/or abdominal bloating.

Rectal hyposensitivity

Rectal hyposensitivity (RH) relates to a diminished perception of rectal distension that is diagnosed during anorectal physiologic investigation. There have been few direct studies of this physiologic abnormality, and its contribution to the development of functional bowel disorders has been relatively neglected. However, it appears to be common in patients with such disorders, being most prevalent in patients with functional constipation with or without fecal incontinence. Indeed, it may be important in the etiology of symptoms in certain patients, given that it is the only "apparent" identifiable abnormality on physiologic testing. Currently, it is usually diagnosed on the basis of elevated sensory threshold volumes during balloon distension in clinical practice, although such a diagnosis may be susceptible to misinterpretation in the presence of altered rectal wall properties, and thus it is uncertain whether a diagnosis of RH reflects true impairment of afferent nerve function. Furthermore, the etiology of RH is unclear, although there is limited evidence to support the role of pelvic nerve injury and abnormal toilet behavior. The optimum treatment of patients with RH is yet to be established. The majority are managed symptomatically, although "sensory-retraining biofeedback" appears to be the most effective treatment, at least in the short term, and is associated with objective improvement in the rectal sensory function. Currently, fundamental questions relating to the contribution of this physiologic abnormality to the development of functional bowel disorders remain unanswered. Acknowledgment of the potential importance of RH is thus required by clinicians and researchers to determine its relevance.

Outcome of segmental colonic resection for slow-transit constipation

BACKGROUND

The standard surgical treatment for slow-transit constipation (STC) is subtotal colectomy and ileorectal anastomosis. A segmental resection may serve the same purpose, but with a reduced risk of side-effects such as diarrhoea or incontinence. The aim of this study was to evaluate the functional results following segmental resection in a consecutive series of patients with STC.

METHODS

Selection criteria included prolonged segmental transit on oral 111In-labelled diethylene triamine penta-acetic acid scintigraphic transit study, and disabling symptoms resistant to medical therapy and treatment of outlet obstruction. Twenty-eight patients (26 women, median age 52 years) were treated with segmental resection and followed prospectively with a validated questionnaire.

RESULTS

After a median of 50 (range 16-78) months, 23 patients were pleased with the outcome. The median (range) stool frequency increased from 1 (0-7) to 7 (0-63) per week (P < 0.001). The number of patients passing hard stools and straining excessively decreased (P = 0.016 and P = 0.041, respectively). The median incontinence score was unchanged. Rectal sensory thresholds were higher in patients in whom the treatment failed (P < 0.001).

CONCLUSION

With a symptomatic relief comparable to that after ileorectal anastomosis and less severe side-effects, segmental colectomy may be a better alternative for selected patients with STC. Thorough preoperative evaluation is important and impaired rectal sensation may predict a poor outcome.

Long-term response to subtotal colectomy in colonic inertia

The purpose of this study was to determine the long-term outcome of patients who had previously undergone subtotal colectomy for severe idiopathic constipation at the University of Florida between 1983 and 1987. In addition, we aimed to determine whether preoperative motility abnormalities of the upper gastrointestinal tract are more common among those patients who have significant postoperative complications after subtotal colectomy. We evaluated 13 patients who underwent subtotal colectomy for refractory constipation between 1983 and 1987 at the University of Florida. Preoperatively, all patients exhibited a pattern consistent with colonic inertia as demonstrated by means of radiopaque markers. Each patient was asked to quantitate the pain intensity and frequency of their bowel movements before and after surgery. In seven patients an ileosigmoid anastomosis was performed, whereas in six patients an ileorectal anastomosis was used. Abdominal pain decreased after subtotal colectomy. Patients with abnormal upper gastrointestinal motility preoperatively experienced greater postoperative pain than those with normal motility regardless of the type of anastomosis. In addition, the number of postoperative surgeries was similar in those patients with abnormal upper motility compared to those with normal motility. Overall, the total number of bowel movements per week increased from 0.5 +/- 0.03 preoperatively to 15 +/- 4.5 (P < 0.007) postoperatively. The results of our study suggest that patients with isolated colonic inertia have a better long-term outcome from subtotal colectomy than patients with additional upper gastrointestinal motility abnormalities associated with their colonic inertia.

Slow Transit Constipation

The diagnosis of slow transit functional constipation is based upon diagnostic testing of patients with idiopathic constipation who responded poorly to conservative measures such as fiber supplements, fluids, and stimulant laxatives. These tests include barium enema or colonoscopy, colonic transit of radio-opaque markers, anorectal manometry, and expulsion of a water-filled balloon. Plain abdominal films can identify megacolon, which can be further characterized by barium or gastrografin studies. Colonic transit of radio-opaque markers identifies patients with slow transit with stasis of markers in the proximal colon. However, anorectal function should be characterized to exclude outlet dysfunction, which may coexist with colonic inertia. Because slow colonic transit is defined by studies during which patients consume a high-fiber diet, fiber supplements are generally not effective, nor are osmotic laxatives that consist of unabsorbed sugars. Stimulant laxatives are considered first-line therapy, although studies often show a diminished colonic motor response to such agents. There is no evidence to suggest that chronic use of such laxatives is harmful if they are used two to three times per week. Polyethylene glycol with or without electrolytes may be useful in a minority of patients, often combined with misoprostol. I prefer to start with misoprostol 200 mg every other morning and increase to tolerance or efficacy. I see no advantage in prescribing misoprostol on a TID or QID basis or even daily because it increases cramping unnecessarily. This drug is not acceptable in young women who wish to become pregnant. An alternative may be colchicine, which is reported to be effective when given as 0.6 mg TID. Long-term efficacy has not been studied. Finally, biofeedback is a risk-free approach that has been reported as effective in approximately 60% of patients with slow transit constipation in the absence of outlet dysfunction. Although difficult to understand conceptually, it is worth attempting and certainly so in patients with associated pelvic floor dyssynergia. Subtotal colectomy with ileorectal anastomosis is often effective in those patients with colonic inertia, normal anorectal function, and lack of evidence of generalized intestinal dysmotility. However, morbidity is significant both early and late in the disease process and must be balanced against current disability. Ileostomy is preferred in the presence of anorectal dysfunction or with associated impairment of continence mechanisms. Similar considerations apply to the patient with disabling functional megacolon. An alternative approach is ileostomy with disconnection of the colon, which is more acceptable to some patients who may hope for future reconnection if recovery occurs. An additional alternative approach for patients with colonic inertia or megacolon who are not good surgical risks is tube cecostomy (or in children, use of the appendix as a conduit to the cecum). This permits either decompression (in megacolon) or antegrade enemas (in colonic inertia). Our surgeons are not enthusiastic about this approach, and I have little experience with it. In general, the use of partial resections of the colon should be discouraged, because marker studies do not define pathophysiology in patients with slow transit constipation.

Effect of bowel cleansing on colonic transit in constipation due to slow transit or evacuation disorder

Colon transit time measurement with radio-opaque markers is a method of studying the passage of luminal contents throughout the colon. Overall colonic transit time (CTT), as well as segmental transit times [right (RTT), left (LTT) and rectosigmoid (RSTT)], can be calculated. We hypothesize that CTT is influenced by faecal impaction when the rectum is emptied infrequently. The aim of this study is to investigate the effect of bowel cleansing on colonic transit time in patients with chronic constipation. In 25 women (age 41 years; range 20-65 years) with constipation according to Thompson criteria, CTT measurement was performed in an unprepared situation and repeated after cleansing with 4 L of Klean-Prepreg. Ten healthy female volunteers (age 41 years; range 27-57 years) were used as controls. In constipated patients, CTT decreased from a median 70 h (range 10-130 h) to 48 h (5-94 h) in the cleansed state (P < 0.001). A shortening of transit time was found in all three segments. In 10 patients with slow transit (ST) (CTT > 86 h), CTT decreased from 110 h (range 94-130) to 86 (38-94) (P < 0.001). Five of the 10 patients with ST before bowel cleansing had a CTT below 86 h after cleansing. In female controls, uncleansed CTT and RSTT shortened from 39 h (23 to 62) and 17 h (8-29) to 29 h (17-48) and 10 h (0-20) after bowel cleansing (P=0.058 and P=0.046). Colonic intraluminal contents have a substantial effect on colonic transit. In female controls, bowel cleansing shortened rectosigmoid transit. Women with constipation had faster transit in the cleansed state, however, the distribution of markers was not altered. Despite the effect of bowel cleansing on CTT, it seems unnecessary to prepare the bowel in clinical practice because the differentiation of patients between slow transit constipation and outlet obstruction is not changed. However, because in an infrequent defecation pattern, the influence of faecal impaction is considerable, CTT should be applied with care for critical clinical decisions in the treatment of constipation.

Reproducibility of colonic transit study in patients with chronic constipation

PURPOSE

Major therapeutic decisions are rendered based on a single colonic transit study. Therefore, the aim of this study was to assess the reproducibility of colonic transit time in patients with chronic constipation.

MATERIALS AND METHODS

Fifty-one patients with chronic idiopathic constipation were randomly selected to undergo two separate colonic transit tests. All clinical conditions, methodology, and patients' instructions were identical on both occasions. The gamma rate (linear correlation analysis) was undertaken between the first and second colonic transit times. Groups were divided according to the diagnoses of colonic inertia (slow-transit constipation), paradoxical puborectalis contraction, and chronic idiopathic constipation (normal-transit constipation).

RESULTS

In 35 of 51 patients (69 percent), the results were identical between the two studies; however, in 16 patients (31 percent), the results were disparate (gamma correlation coefficient = 0.53; P < 0.01). The specific correlation coefficients for patients with colonic inertia, paradoxical puborectalis contraction, and chronic idiopathic constipation were 0.12, 0.21, and 0.60 (P < 0.01), respectively. Moreover, the success rate of colectomy for colonic inertia was significantly higher in patients who underwent a repeat transit study confirming inertia than in patients who underwent colectomy based on a single study.

CONCLUSIONS

Overall, colonic transit time is reproducible in patients with chronic constipation. The correlation coefficient is best for patients with idiopathic constipation and worst for patients with colonic inertia. This new finding suggests that suboptimal surgical outcome may be attributable to inaccurate diagnosis. Because of this poor correlation coefficient, in patients with colonic inertia, consideration should be given to repeating the colonic transit study before colectomy to help secure the diagnosis and improve outcome.

Rectal akinesia as a new cause of impaired defecation

PURPOSE

The aim of this prospective study was to point out a new concept of dyschezia using dynamic videoproctography.

METHODS

A total of 154 consecutive patients with impaired defecation prospectively underwent dynamic videoproctography from 1996 to 1998. Evacuation of thick barium of standardized consistency was fully videotaped under fluoroscopy in the sitting position. We measured the weight of barium injected into the rectum (Q1 in g), the weight of barium evacuated (Q2 in g) and the time for rectal evacuation (t in seconds). Flow rate and postdefecation residue were given by calculating Q2/t and (Q1 - Q2) X 100/Q1, respectively. We studied all patients whose flow rate and postdefecation residue were less than 5 g/second and more than 30 percent, respectively. These values were arbitrarily chosen, based on rectal evacuation in 25 controls (5 healthy volunteers together with 20 patients without dyschesia).

RESULTS

Nine of 154 patients with dyschesia fulfilled the criteria and had none of the usually known causes of dyschezia, such as anismus, megarectum, intussusception, rectal prolapse, rectocele, or enterocele. These nine patients had a normal rectal anatomic appearance and a wide-open short anus but despite exhausting straining efforts were unable to obtain total rectal emptying. Dynamic videoproctography brings strong arguments for an absence of rectal wall contraction, despite normal functioning pelvic floor.

CONCLUSIONS

Dynamic videoproctography allows identification of new features in patients with dyschesia: very slow defecation flow rate and high postdefecation residue. This new concept could be called rectal akinesia by analogy with bladder akinesia in some dysuric patients.

Approach to patients with refractory constipation

Constipation is a very frequent problem, particularly in elderly patients. Constipation is a common reason for patients to seek medical advice, and it accounts for a large number of different prescription and over-the-counter medications. In many cases, no definite cause can be found. Most patients respond to conservative therapy with increased fiber and fluid intake alone. Patients with constipation that is more difficult to control or with alarm symptoms (eg, blood in stool, sudden onset, weight loss, or decreasing stool caliber) warrant further investigation. A variety of medical, behavioral, and surgical therapies can be employed to help these more refractory patients.

Clinical and physiological heterogeneity in slow transit constipation: a review of 122 patients

OBJECTIVE

The outcome of surgery in patients with slow transit constipation (STC) is unpredictable. This may reflect clinical and physiological heterogeneity within this group of patients. This study attempts to identify subgroups of patients with STC according to clinical history, and compares the pathophysiological findings between the two largest: including patients with chronic idiopathic STC, and those with symptoms acquired after pelvic surgery or childbirth (post-pelvic intervention STC).

PATIENTS AND METHODS

Review of clinical and gastrointestinal pathophysiological findings of 122 consecutive patients with slow colonic transit.

RESULTS

Six subgroups of patients were defined according to the time and nature of onset of symptoms. Pathophysiological comparison of the two main groups: chronic idiopathic STC (n=65 (53%)) and post-pelvic intervention STC (n=22 (18%)), yielded three main conclusions: (i) the pattern of colonic transit is similar in both groups, i.e. predominantly (approximately 70%) generalized; (ii) the prevalence of a rectal evacuatory disorder is significantly higher in patients with post-pelvic intervention STC (77% vs 32%, P=0.004); and (iii) small bowel motility disturbances occur in both groups (overall 48%), and are therefore not limited to patients with chronic idiopathic STC.

CONCLUSION

There are pathophysiological similarities and differences between the main two subgroups of STC. Such findings may help our understanding of the pathogenesis and have implications in the future management of these patients.

Slow transit constipation: a model of human gut dysmotility. Review of possible aetiologies

Slow transit constipation is a severe condition of gut dysmotility that predominantly affects young women and may result in surgical intervention. Current medical treatments for STC are often ineffective, and the outcome of surgery is unpredictable. STC was first described almost a century ago. Since this time, progress in improving therapy for this condition has been complicated by a lack of understanding of the aetiology, and great variation in the methods and criteria used for the study of patients with this debilitating disorder. It is difficult to find unequivocal data, and harder still to give a definitive picture of the cause or causes of STC. Here we consider the evidence for various aetiologies of STC, in the light of the physiological and pathological findings.

Outcome of colectomy for slow transit constipation

OBJECTIVE

To review the outcome data for colectomy performed for patients with slow transit constipation (STC).

BACKGROUND

The outcome of surgical intervention in patients with STC is unpredictable. This may be a consequence of the lack of effectiveness of such interventions or may reflect heterogeneity within this group of patients.

METHODS

The authors reviewed the data of all series in the English language that document the outcome of colectomy in > or = 10 patients in the treatment of STC.

RESULTS

Thirty-two series fulfilled the entry criteria. There was widespread variability in patient satisfaction rates after colectomy (39% to 100%), reflecting large differences in the incidence of postoperative complications and in long-term functional results. Outcome was dependent on several clinical and pathophysiologic findings and on the type of study, the population studied, and the surgical procedure used.

CONCLUSIONS

It may be possible to predict outcome on the basis of preoperative clinical and pathophysiologic findings. This review suggests a rationale for the selection of patients for colectomy.

Constipation, diarrhea, and irritable bowel syndrome

Constipation, diarrhea, and irritable bowel syndrome are commonly encountered in the primary care practice. Most episodes of constipation and diarrhea are benign and self-limited. Patients with chronic constipation should undergo a screening evaluation to exclude organic disease, after which most can be managed successfully with dietary modification and fiber supplementation. The cause of chronic diarrhea usually can be discerned clinically, with irritable bowel syndrome, inflammatory bowel disease, and lactose intolerance being diagnosed most frequently. Irritable bowel syndrome is a functional gastrointestinal disorder characterized by abdominal pain and disordered defecation, which is successfully managed with a strong physician-patient relationship and periodic pharmacologic intervention.

Idiopathic Constipation and Fecal Incontinence

Patients with constipation or fecal incontinence have great potential for remediation. Both disorders warrant a thorough diagnostic evaluation to search for remediable causes, especially to identify defecation disorders. Constipation should be treated by relieving any impactions and then starting a course of fiber supplementation of at least 20 g per day. If not successful, other agents such as lactulose, polyethylene glycol solutions, or stimulants can be added. Biofeedback may be very helpful. If all else fails, several surgical procedures are available. Fecal incontinence should be treated by fiber supplements, encouragement of regularity, and enemas as needed. Kegel exercises and biofeedback are often helpful, but surgery may be needed and is most effective in recent onset or traumatically induced incontinence.