Etiopathological aspects of achalasia: lessons learned with Hirschsprung's disease

The etiology of primary esophageal achalasia is largely unknown. There is increasing evidence that genetic alterations might play an important but underestimated role. Current knowledge of the genetic base of Hirschsprung's disease in contrast is far more detailed. The two enteric neuropathies have several clinical features in common. This association may also exist on a cellular and molecular level. The aim of this review is to enlighten those etiopathogenetic concepts of Hirschsprung's disease that seem to be useful in uncovering the pathological processes causing achalasia. Three aspects are looked at: (i) the genetic base of Hirschsprung's disease, particularly its major susceptibility gene rearranged during transfection and its potential reference to achalasia; (ii) the altered motor functions in both conditions with loss of inhibitory innervation and interstitial cell pathology; and (iii) the involvement of these motility disorders in genetic syndromes.

Clinical and manometric course of nonspecific esophageal motility disorders

BACKGROUND AND AIMS

The evolution of nonspecific esophageal motility disorders remains unclear. The aim of this study was to investigate whether nonspecific esophageal motility disorders progress into specific motility disorders and whether such progression is predictable.

METHODS

Seventy-six symptomatic patients (49 males, 27 females, mean age 57 ± 16 years) with newly diagnosed nonspecific esophageal motility disorders were prospectively registered and followed-up. Follow-up visits, with structured interviews and manometric re-evaluation, were recommended biannually and whenever symptoms exacerbated.

RESULTS

Forty-three patients were followed for up to 4 years, symptoms worsened in 30% of patients, resolved in 26%, improved in 14% and were unchanged in 30%. Twenty-eight patients agreed to undergo manometric re-evaluation. Fifteen (53.6%) of these patients showed a progression to achalasia. The remaining patients continued to display features of nonspecific esophageal motility disorders (32%) or had normal motility (11%). The only significant association could be determined between age and progression to achalasia reaching nearly 100% in patients' ≤46 years of age. In contrast, none of the patients' ≥68 years progressed.

CONCLUSION

More than half of the patients in our cohort with nonspecific esophageal motility disorders showed a transition into achalasia. Neither manometric nor clinical findings predicted the progression of nonspecific esophageal motility disorders. However, young patients were more likely to progress to achalasia.

Is the schatzki ring a unique esophageal entity?

AIM: To study, whether the association of Schatzki rings with other esophageal disorders support one of the theories about its etiology.

METHODS: From 1987 until 2007, all patients with newly diagnosed symptomatic Schatzki rings (SRs) were prospectively registered and followed. All of them underwent structured interviews with regards to clinical symptoms, as well as endoscopic and/or radiographic examinations. Endoscopic and radiographic studies determined the presence of an SR and additional morphological abnormalities.

RESULTS: One hundred and sixty-seven patients (125 male, 42 female) with a mean age of 57.1 ± 14.6 years were studied. All patients complained of intermittent dysphagia for solid food and 113 (79.6%) patients had a history of food impaction. Patients experienced symptoms for a mean of 4.7 ± 5.2 years before diagnosis. Only in 23.4% of the 64 patients who had endoscopic and/or radiological examinations before their first presentation to our clinic, was the SR previously diagnosed. At presentation, the mean ring diameter was 13.9 ± 4.97 mm. One hundred and sixty-two (97%) patients showed a sliding hiatal hernia. Erosive reflux esophagitis was found in 47 (28.1%) patients. Twenty-six (15.6%) of 167 patients showed single or multiple esophageal webs; five (3.0%) patients exhibited eosinophilic esophagitis; and four (2.4%) had esophageal diverticula. Four (7%) of 57 patients undergoing esophageal manometry had non-specific esophageal motility disorders.

CONCLUSION: Schatzki rings are frequently associated with additional esophageal disorders, which support the assumption of a multifactorial etiology. Despite typical symptoms, SRs might be overlooked.

Treatment and surveillance strategies in achalasia: an update

Controversy exists with regard to the optimal treatment for achalasia and whether surveillance for early recognition of late complications is indicated. Currently, surgical myotomy and pneumatic dilation are the most effective treatments for patients with idiopathic achalasia, and a multicenter, randomized, international trial has confirmed similar efficacy of these treatments, at least in the short term. Clinical predictors of outcome, patient preferences and local expertise should be considered when making a decision on the most appropriate treatment option. Owing to a lack of long-term benefit, endoscopic botulinum toxin injection and medical therapies are reserved for patients of advanced age and those with clinically significant comorbidites. The value of new endoscopic, radiologic or surgical treatments, such as peroral endoscopic myotomy, esophageal stenting and robotic-assisted myotomy has not been fully established. Finally, long-term follow-up data in patients with achalasia support the notion that surveillance strategies might be beneficial after a disease duration of more than 10-15 years.

Electron microscopic studies of esophageal wall structures in patients with achalasia: casting more light on unresolved aspects of pathogenesis

BACKGROUND/AIMS

Previous investigations of esophageal tissue and serum probes failed to identify a common etiologic agent predisposing to, triggering or causing achalasia. In order to further examine the detailed pathologic processes resulting in achalasia we performed electron-microscopic studies of muscle biopsies taken from the LES high pressure zone in patients undergoing surgery--either Heller myotomy or esophageal resection.

METHODOLOGY

Smooth muscle biopsies with a 20 x 15-mm longitudinal segment of the myenteric plexus from the distal esophagus (lower border of the esophageal incision) in patients undergoing Heller myotomy for achalasia were taken. In patients with end-stage achalasia and mega-esophagus with esophageal resection, the complete esophageal body was available. For electron microscopy, ultrathin sections were contrasted with uranyl-acetate and plumbic citrate. The photographs were taken by a digitalized electron-microscope (ZEISS, Leo 905).

RESULTS

A striking finding was the large number of mast cells in the region of the smooth muscle layers as well as in the surrounding connective tissue and also in close vicinity to the nerve cells and to the nerve fibres. The smooth muscle cells in these regions were very often stained less intensively, and they showed signs of an acute degenerative process.

CONCLUSION

Our electron microscopic studies suggest that mast cells may play an important role in the secondary pathogenesis of achalasia. Esophageal retention and bacterial overgrowth with stasis esophagitis causing mucosal injury may be a mechanism of increased antigen exposure.

Current clinical approach to achalasia

Idiopathic achalasia is a rare primary motility disorder of the esophagus. The classical features are incomplete relaxation of a frequently hypertensive lower esophageal sphincter (LES) and a lack of peristalsis in the tubular esophagus. These motor abnormalities lead to dysphagia, stasis, regurgitation, weight loss, or secondary respiratory complications. Although major strides have been made in understanding the pathogenesis of this rare disorder, including a probable autoimmune mediated destruction of inhibitory neurons in response to an unknown insult in genetically susceptible individuals, a definite trigger has not been identified. The diagnosis of achalasia is suggested by clinical features and confirmed by further diagnostic tests, such as esophagogastroduodenoscopy (EGD), manometry or barium swallow. These studies are not only used to exclude pseudoachalasia, but also might help to categorize the disease by severity or clinical subtype. Recent advances in diagnostic methods, including high resolution manometry (HRM), might allow prediction of treatment responses. The primary treatments for achieving long-term symptom relief are surgery and endoscopic methods. Although limited high-quality data exist, it appears that laparoscopic Heller myotomy with partial fundoplication is superior to endoscopic methods in achieving long-term relief of symptoms in the majority of patients. However, the current clinical approach to achalasia will depend not only on patients’ characteristics and clinical subtypes of the disease, but also on local expertise and patient preferences.

Appropriateness of colonoscopy in Europe (EPAGE II). Screening for colorectal cancer

BACKGROUND AND STUDY AIMS

To summarize the published literature on assessment of appropriateness of colonoscopy for screening for colorectal cancer (CRC) in asymptomatic individuals without personal history of CRC or polyps, and report appropriateness criteria developed by an expert panel, the 2008 European Panel on the Appropriateness of Gastrointestinal Endoscopy, EPAGE II.

METHODS

A systematic search of guidelines, systematic reviews, and primary studies regarding colonoscopy for screening for colorectal cancer was performed. The RAND/UCLA Appropriateness Method was applied to develop appropriateness criteria for colonoscopy in these circumstances.

RESULTS

Available evidence for CRC screening comes from small case-controlled studies, with heterogeneous results, and from indirect evidence from randomized controlled trials (RCTs) on fecal occult blood test (FOBT) screening and studies on flexible sigmoidoscopy screening. Most guidelines recommend screening colonoscopy every 10 years starting at age 50 in average-risk individuals. In individuals with a higher risk of CRC due to family history, there is a consensus that it is appropriate to offer screening colonoscopy at < 50 years. EPAGE II considered screening colonoscopy appropriate above 50 years in average-risk individuals. Panelists deemed screening colonoscopy appropriate for younger patients, with shorter surveillance intervals, where family or personal risk of colorectal cancer is higher. A positive FOBT or the discovery of adenomas at sigmoidoscopy are considered appropriate indications.

CONCLUSIONS

Despite the lack of evidence based on randomized controlled trials (RCTs), colonoscopy is recommended by most published guidelines and EPAGE II criteria available online (http://www.epage.ch), as a screening option for CRC in individuals at average risk of CRC, and undisputedly as the main screening tool for CRC in individuals at moderate and high risk of CRC.

Reduction of interstitial cells of Cajal (ICC) associated with neuronal nitric oxide synthase (n-NOS) in patients with achalasia

BACKGROUND

The etiology of achalasia is still unknown. The current theories of chronic inflammation leading to autoimmune response with destruction and loss of the inhibitory myenteric ganglion cells enlighten its pathogenesis in a limited way only. Interstitial cells of Cajal (ICC) have been shown to be involved in nitrergic neurotransmission of the lower esophageal sphincter (LES).

AIM

To investigate the significance of ICC and neuronal nitric oxide synthase (n-NOS) in esophageal wall tissue of patients undergoing surgery for achalasia.

METHODS

In 53 patients with a median age of 45 (6-78) yr undergoing surgery for achalasia, the immunoreactivity of ICC (CD117/c-kit) and n-NOS was assessed. In 42 patients, biopsies were taken from the LES high-pressure zone during Heller myotomy, whereas in 11 patients with end-stage achalasia and a decompensated megaesophagus, the complete esophagus was resected. A semiquantitative analysis was carried out and ICC and n-NOS impairments were classified into four grades. Staining intensity was correlated with preoperative clinical, radiologic, and manometric findings and with long-term postoperative Eckardt score.

RESULTS

Grade III/IV ICC reduction (severe reduction to complete loss) was seen in 59.5% of all biopsy specimens of the LES high-pressure zone. Patients with grade III/IV ICC reduction had a significantly longer duration of achalasia symptoms (3 [0-43] yr) than patients with minor to marked (grade I/II) impairment (1 [0-16] yr, P= 0.028). A majority (72.5%) of tissue samples revealed severe reduction to complete loss of n-NOS immunoreactivity. The preoperative Eckardt score was statistically significantly different between patients with grade I/II and those with grade III/IV n-NOS reductions (P= 0.031). CD117 (c-kit) positivity was statistically significantly correlated with n-NOS staining intensity (correlation coefficient r= 0.781, P < 0.0001).

CONCLUSION

The present results suggest that in the pathogenesis of achalasia, especially in the development of the LES high-pressure zone, depletion of ICC networks and potential changes in the electrical activity of smooth muscle cells may play a crucial role. The reduction in CD117-positive ICC in a few patients also seemed to be of relevance, even if the cells of Auerbach's plexus were unscathed. The associated reduced NOS release might underlie the profound ICC impairment and could possibly be responsible for the lack of LES relaxation, because of missing inhibitory neurotransmission. It is unclear, however, whether the ICC loss is primarily caused by the accelerated attrition of mature cells or their impaired regeneration.

[Achalasia or pseudoachalasia? Problems of diagnostic and treatment decisions in two cases]

HISTORY

Patient 1 (female, aged 55 years) had for some time complained of morning nausea. She reported symptoms of reflux with regurgitation of food for two-and-a-half years and also dysphagia with retrosternal bolus obstruction for the last eighteen months. Patient 2 (male, aged 84 years) complained of restrosternal dysphagia with each intake of food for one year, weight loss of 12 kg and occasional regurgitation of food.

INVESTIGATIONS

The general condition of patient 1 was only slightly impaired but that of patient 2 markedly reduced. Routine laboratory tests were unremarkable in both. Barium meal in patient 1 revealed fixed narrowing in the region of the esophageal hiatus. The inferior esophageal sphincter was closed but opened under pressure during esophagogastroscopy. At computed tomography (CT) of the thorax and abdomen an esophageal fistula was detected and bronchoscopy confirmed its opening into the esophagus. Barium meal in patient 2 (done at another hospital) demonstrated a spastic esophagus. Manometry of the esophagus revealed at rest an abnormal increase in the inferior esophageal sphincter without relaxation.

DIAGNOSIS, TREATMENT AND COURSE

Patient 1 had an achalasia and an esophagogastric fistula with recurrent aspiration pneumonia, bronchial carcinoma being excluded. The fistula was closed by suture, followed by cardiomyotomy and anterior partial gastric fundectomy. In patient 2 an isolated achalasia had at first been suspected and botulinum toxin injected into the inferior esophageal sphincter. This caused a progressively worse dysphagia. CT of the thorax and abdomen established the diagnosis of a pseudoachalasia due to an adenoma of the cardia, proven by biopsy at an exploratory laparotomy. A stent was implanted in the esophagus: the postoperative course was without complication.

CONCLUSION

Patient 2 with the pseudoachalasia had a relatively short history of dysphagia, marked weight loss and was elderly. This compares with the history in patient 1: shorter period of dysphagia, no weight loss and a younger age. The differential diagnosis between the two conditions may be difficult with routine methods and other imaging modalities: exploratory surgery may be necessary for a definitive diagnosis.

Long-term results of conventional myotomy in patients with achalasia: a prospective 20-year analysis

Myotomy has proved to be an efficient primary therapy in patients with achalasia, especially in younger patients (<40 years of age). The results of laparoscopic myotomy cannot be finally assessed, on account of the shorter postoperative follow-up. Thus, there are considerable data regarding intermediate-term outcomes after laparoscopic myotomy. The aim of our study was a 20-year analysis of the conventional cardiomyotomy as the underlying basis assessing the results of minimal-invasive surgery. Within 20 years (September 1985 through September 2005), 161 operations for achalasia were performed in our clinic. Enrolled in this study were 108 patients with a conventional, transabdominal myotomy in combination with an anterior semifundoplication (Dor procedure) and a minimal follow-up of 6 months. All patients were prospectively followed and, in addition to radiologic and manometric examinations of the esophagus, the patients were asked for their clinical symptoms by structured interviews in 2-year intervals. The median age at the time of surgery was 44.5 (range, 14-78) years, and 72.2% of the patients were males. The median length of the preoperative symptoms was 3 years (3 months to 50 years), and the postoperative follow-up was 55 (range, 6-206) months. In 70 (64.8%) patients, a pneumatic dilation had been performed. The preoperative Eckardt score of 6 (range, 2-12) could be reduced to 1 (range, 0-4) after myotomy (P<0.0001). Consequently, with 97.2% of all patients, a good-to-excellent result was achieved in the long-term follow-up, corresponding to a clinical stage I-II. Postoperatively, 69 patients (63.9%) gained weight. The radiologically measured maximum diameter of the esophagus decreased from preoperatively 45 (range, 20-75) mm to postoperatively 30 (range, 20-60) mm, while the minimum diameter of the cardia increased from 3.4 (range, 1-10) mm to 10 (range, 5-15) mm. The resting pressure of the lower esophageal sphincter could be reduced from 28.4 (range, 9.4-56.0) mm Hg to 8.6 (range, 3.0-22.5) mm Hg. Conventional myotomy leads in the long run with high efficiency to an improvement of the symptoms evident in achalasia. These results may be regarded as the basis for assessment of the minimal-invasive procedure.

Achalasie bei zirkumskripter Sklerodermie

HISTORY

A 38-year-old man had been suffering from circumscribed scleroderma for 12 years. Dysphagia had been diagnosed 5 years ago and for the last 2 years he had retrosternal dysphagia for solid and liquid food. His symptoms had increased markedly 6 months before presenting at our hospital and the patient had lost 15 kg of weight. 2 months ago, a percutaneous endoscopic gastrostomy (PEG) had been inserted at another hospital.

INVESTIGATIONS

The patient presented in a reduced general and nutritional state. The routine laboratory tests and tumor markers were within normal range. Endoscopy showed a moderately dilated esophagus with food remnants. It was not possible to pass the cardia without exerting pressure. Esophageal manometry and barium upper gastrointestinal series revealed the classical findings of achalasia.

THERAPY AND COURSE

An extramucosal Heller myotomy with anterior semifundoplication (Dor's procedure) was performed. The postoperative course was uneventful and the patient was able to take solid and liquid food without any dysphagia.

CONCLUSION

The association of achalasia and circumscribed scleroderma has not been described in medical publications yet. The entity could possibly be based on common autoimmune mechanisms and an analogous pathogenesis with resulting fibrosis.

Spectrum of histopathologic findings in patients with achalasia reflects different etiologies

BACKGROUND

The etiology of achalasia is still unknown. The aim of the present study was to elucidate its underlying pathologies and their chronology by investigation of esophageal specimens in patients undergoing surgery (esophageal resection or myotomy) for achalasia.

METHODS

In 17 patients with achalasia, histopathologic examinations of the esophageal wall focussing on the myenteric plexus were performed. Preoperative diagnosis was based on clinical evaluation, esophagogastroscopy, barium esophagogram in all, and esophageal manometry in eight patients. The median age at the time of surgery was 54 years (range: 14-78 years). In eight cases, the complete esophageal, body and in nine cases a smooth muscle biopsy including parts of the myenteric plexus from the distal part of the esophagus (high pressure zone) was available. The tissue specimens were fixed in formalin and embedded in paraffin. The staining procedures were hematoxylin and eosin (HE), Elastica van Gieson (EvG), and periodic acid-Schiff (PAS) reaction. Immunohistochemical examinations were performed with antibodies against B and T lymphocytes, neurofilament, protein gene-related product (PGP 9.5), S-100 protein, myosin, desmin, smooth muscle actin and substance P.

RESULTS

In 13 of 17 patients, a significant reduction of the number of intramural ganglion cells was present. Common findings were a severe fibrosis of the smooth muscle layer (10/17) and obvious myopathic changes of the smooth muscle cells (5/17). Staining for B and T lymphocytes found signs of inflammation in mucosal and muscular areas. Three patients exhibited a marked invasion of eosinophilic granulocytes of the muscularis propria (eosinophilia). Esophageal carcinoma had developed in three patients (squamous cell carcinoma in two and carcinoma in situ in another patient with Barrett's esophagus and high-grade dysplasia). Severe inflammatory reactions (neural, eosinophilic and mucosal) dominated in patients with a longstanding history of achalasia (>10 years) as well as a marked endomysial fibrosis.

CONCLUSIONS

The histopathological investigations of the esophageal wall in 17 patients undergoing esophageal resection or myotomy for achalasia suggest that the reduction of intramural ganglion cells might be a secondary change, probably due to inflammation triggered by autoimmune mechanisms or a chronic degenerative process of the central and/or peripheral part of the vagal nerve. The primary lesion could also be a severe myopathy of the smooth muscle cells.

[Esophageal resection for non-specific esophageal motility disorder]

A 47-year-old patient presented with a history of dysphagia for solid food for almost 10 years and weight loss of more than 50 kg. Non-resecting surgical as well as endoscopic procedures (laparoscopic cardiomyotomy with secondary antireflux operations, balloon dilation, Botulinum-toxin injection) were without success. A barium esophagogram showed a confinement of the distal esophagus with a filiform passage of the contrast medium and undigested food in the prestenotic dilated esophageal corpus. Manometry displayed a hypertensive lower esophageal sphincter with a resting pressure of 43.8 mmHg - although completely relaxing. The tubular esophagus was aperistaltic with 100 % simultaneous and repetitive contractions. As all attempts of previous therapy had failed, a transhiatal esophagectomy with gastric pull-up and cervical esophagogastrostomy ensued. Neuropathological examination of the esophagus showed that degeneration of the myenteric plexus was not severely involved, whereas inflammatory and fibrotic changes were obvious. Esophageal resection provided the only chance of a long-term benefit for our patient with relief of dysphagia.

Pseudoachalasia: a case series and analysis of the literature

OBJECTIVE

Pseudoachalasia frequently cannot be distinguished from idiopathic achalasia by manometry, radiologic examination or endoscopy. Mechanisms proposed to explain the clinical features of pseudoachalasia include a circumferential mechanical obstruction of the distal esophagus or a malignant infiltration of inhibitory neurons within the myenteric plexus.

MATERIAL AND METHODS

Between January 1980 and December 2002, the clinical features of 5 patients with pseudoachalasia and 174 patients with primary achalasia, diagnosed in a single center, were compared. A literature analysis of the etiology of pseudoachalasia for the time period 1968 to December 2002 was performed. The search concentrated on the databases and online catalogues PubMed, Web of Science, Cochrane Library and Current Contents Connect.

RESULTS

In our case series, patients with pseudoachalasia reported a shorter duration of symptoms and tended to be older than patients with primary achalasia. Conventional manometry, endoscopy and radiologic examination of the esophagus proved to be of little value in distinguishing between the diseases. In the majority of cases only surgical exploration revealed the underlying cause. A coincidence of primary achalasia and disorders of the gastroesophageal junction was excluded by showing return of peristalsis following treatment. The analysis of the literature showed a total of 264 cases of pseudoachalasia in 122 publications. Most cases of were due to malignant disease (53.9% primary and 14.9% secondary malignancy), followed by benign lesions (12.6%) and sequelae of surgical procedures at the distal esophagus or proximal stomach (11.9%). In rare instances, the disease was an expression of a paraneoplastic process due to distant neuronal involvement rather than to local invasion with destruction of the myenteric plexus (2.6%).

CONCLUSIONS

The diagnosis of pseudoachalasia is difficult to establish by conventional diagnostic measures. The main distinguishing feature of secondary versus primary achalasia is the complete reversal of pathologic motor phenomena following successful therapy of the underlying disorder.

[Epiphrenic diverticulum: possible causes and surgical therapy]

INTRODUCTION

In the majority of patients suffering from epiphrenic diverticula, functional disorders of the esophagus are evident. The significance of surgical therapy is unclear, especially in case of nonspecific esophageal motility disorders. Besides "triple therapy" with diverticulectomy, myotomy, and semifundoplication, myotomy alone is also applied. Based on our own long-term results, we intended to prove if a treatment concept modeled on the motility disorder is justified.

PATIENTS AND METHODS

Between July 1989 and December 2002, 12 patients with symptomatic epiphrenic diverticula underwent surgery at our clinic. Myotomy was carried out with diverticulectomy (and semifundoplication) only if achalasia had been proven, and an antireflux procedure was done only in case of gastroesophageal reflux. Surgery was performed openly in ten patients, and laparoscopically in two.

RESULTS

After a median follow-up of 46 months (range 9-169), all patients regarded the operative results as good to very good (11 follow-up investigations).

CONCLUSION

To alleviate symptoms in patients with epiphrenic diverticula, myotomy is only rarely indicated. As with diverticulectomy, it is only necessary, if achalasia has been proven. Our long-term results do not suggest performing myotomy as a rule for underlying unspecific motility disorders of the esophagus.

Effects of Pneumatic Dilation and Myotomy on Esophageal Function and Morphology in Patients with Achalasia

Only two treatment modalities–pneumatic dilation and Heller myotomy–promise long-term relief from dysphagia and regurgitation in patients with achalasia. The objective of this study was to determine whether both options differ in their effects on esophageal function, morphology, and improvement in symptoms. Eighty-nine patients diagnosed with achalasia between January 1980 and December 2002 at a single center were enrolled in this study. Sixty-four patients underwent pneumatic dilation and 25 Heller myotomy in combination with an anterior semifundoplication (Dor procedure). Clinical evaluation (Eckardt-Score), esophageal manometry, and barium swallow were performed before and within 6 months after treatment. Our data shows that Heller myotomy reduces the LES resting pressure more markedly (7.9 [3.7–16.9] mm Hg) than pneumatic dilation (14.5 [2.7–36.0] mm Hg) ( P < 0.0001) with similar pressures at diagnosis in both groups. Morphologic changes, assessed by the diameter of the esophageal corpus, were also more pronounced after surgical therapy ( P > 0.05). Both options will lead to an immediate and significant improvement in symptoms, although the two treatment modalities did not differ in their subjective results. As only objective findings, such as those obtained by manometry and the timed barium swallow, have proven relevance for the assessment of long-term results, surgical therapy is the superior and more effective treatment option in patients with achalasia.

Effects of pneumatic dilation and myotomy on esophageal function and morphology in patients with achalasia

Only two treatment modalities-pneumatic dilation and Heller myotomy-promise long-term relief from dysphagia and regurgitation in patients with achalasia. The objective of this study was to determine whether both options differ in their effects on esophageal function, morphology, and improvement in symptoms. Eighty-nine patients diagnosed with achalasia between January 1980 and December 2002 at a single center were enrolled in this study. Sixty-four patients underwent pneumatic dilation and 25 Heller myotomy in combination with an anterior semifundoplication (Dor procedure). Clinical evaluation (Eckardt-Score), esophageal manometry, and barium swallow were performed before and within 6 months after treatment. Our data shows that Heller myotomy reduces the LES resting pressure more markedly (7.9 [3.7-16.9] mm Hg) than pneumatic dilation (14.5 [2.7-36.0] mm Hg) (P < 0.0001) with similar pressures at diagnosis in both groups. Morphologic changes, assessed by the diameter of the esophageal corpus, were also more pronounced after surgical therapy (P > 0.05). Both options will lead to an immediate and significant improvement in symptoms, although the two treatment modalities did not differ in their subjective results. As only objective findings, such as those obtained by manometry and the timed barium swallow, have proven relevance for the assessment of long-term results, surgical therapy is the superior and more effective treatment option in patients with achalasia.

[Long-term results for Heller-myotomy with anterior semifundoplication in achalasia]

INTRODUCTION

The positive success rate of cardiomyotomy in the treatment of achalasia has recently - especially in young patients - resulted in a primary operative treatment concept. Few studies of long-term effects of myotomy concerning the removal of dysphagia and the development of gastroesophageal reflux have been submitted.

PATIENTS AND METHODS

In the period between September 1985 and March 2003, an open, transabdominal Heller-myotomy combined with a Dor-semifundoplication was carried out in 93 patients with achalasia. 77 patients were followed for more than 6 months postoperatively (median follow-up: 70 months). The procedure was prospectively observed, and patients were questioned concerning their clinical symptoms by means of structured interviews. X-ray examinations of the esophagus were pre- and postoperatively available of 47 patients, manometrical findings before and after myotomy of 26 patients.

RESULTS

The pre-operatively existing symptoms dysphagia, regurgitation, retrosternal pain and weight-loss could be improved by myotomy in 97 % of the patients with good to excellent long-term results. Post-operatively, a significant reduction of the median maximum diameter of the esophagus of 50 mm to 30 mm was evident (p < 0.001), whereas the diameter of the cardia increased from 3 mm to 10 mm (p < 0.001). The pre-operative resting pressure of the lower esophageal sphincter (LES) of 29.3 mmHg was reduced to 7.9 mmHg (p < 0.001). Patients suffering from reflux esophagitis showed a significant lower resting pressure of the LES (4 mmHg) in comparison with patients without reflux esophagitis (8.5 mmHg) after myotomy (p=0.045). The clinical long-term results of patients with preceding pneumatic dilation did not differ significantly from those with primary myotomy.

CONCLUSION

Conventional Heller-myotomy with anterior semifundoplication can in the long run remove the symptoms existent in achalasia with high efficiency. If the decrease of the post-operative resting pressure of the LES is too intense (< 5 mmHg), a possible gastroesophageal reflux has to be taken into account. The results of open cardiomyotomy have to be regarded as standard for assessing the minimal-invasive procedure.

Transabdominal ultrasonography in achalasia

BACKGROUND

The aim of this study was to investigate whether transabdominal ultrasonography can differentiate between achalasia and neoplasms involving the oesophagogastric junction.

METHODS

Ultrasonography was performed in 28 patients with achalasia, 28 sex- and age-matched controls and 13 patients with neoplasms. All studies were done with a 3.5 MHz real time curved array scanner and using an electronic caliper to measure oesophageal wall thickness and the maximum oesophageal diameter. Specificity and sensitivity in making a diagnosis of achalasia and tumours were determined by having unmarked images interpreted by a blinded observer.

RESULTS

Patients with achalasia were identified by recognition of a dilated oesophagus without the presence of a neoplastic lesion (maximum oesophageal diameter (median)=achalasia: 20.0 (14; 25)mm; controls 10.1 (9; 11) mm; P < 0.001). Oesophageal wall thickness was similar in the two groups (achalasia: 3.2 (2.5; 3.4) mm; controls: 2.9 (2.5; 3.4)). In patients with neoplasms, a hypoechoic lesion was identified at the level of the gastric cardia. The sensitivity of making a tumour diagnosis was 100% and the specificity 82%.

CONCLUSION

Transabdominal ultrasonography is a useful, non-invasive diagnostic aid in differentiating patients with primary achalasia from those with neoplastic lesions at the gastric cardia.

Heller myotomy for failed pneumatic dilation in achalasia: how effective is it?

OBJECTIVES

This long-term prospective study describes the effect of myotomy in patients who fail to respond to repeated pneumatic dilations and compares their clinical course with that of patients responding to dilation therapy.

METHODS

Nineteen consecutive patients who had never reached a clinical remission after repeated pneumatic dilation underwent myotomy. Their clinical course was compared with that of patients who had reached a clinical remission after a single (n = 34) or multiple (n = 14) pneumatic dilation(s). Symptoms were graded with a previously described symptom score ranging from 0 to 12. Remission was defined as a score of 3 or less persisting for at least 6 months. Duration of remission was summarized using Kaplan Meier survival curves. Association between baseline factors and the need for surgery was evaluated using logistic regression.

RESULTS

Complete follow-up was obtained for 98.5% of the patients. The median duration of follow-up was similar in patients treated by myotomy (10.0 years), in patients reaching a clinical remission after a single dilation (10.6 years), but differed in patients undergoing repeated dilations (6.9 years). The 10-year remission rate was 77% (95% CI 53-100%) in patients undergoing myotomy, 72% (95% CI: 56-87%) in patients "successfully" treated with a single pneumatic dilation and 45% (95% CI: 16-73%) in patients undergoing several dilations. Among all baseline factors investigated, young age was associated with an increased need of surgery.

CONCLUSIONS

Myotomy is an effective treatment modality in patients with achalasia who have failed to respond to pneumatic dilation. Young patients may benefit from primary surgical therapy.

Pneumatic dilation for achalasia: late results of a prospective follow up investigation

BACKGROUND

and aims: In this prospective study, we determined the long term clinical course of patients with achalasia who were treated by pneumatic dilation using the Browne-McHardy dilator, and determined whether previously described predictors of outcome remain significant after prolonged follow up.

METHODS

Between 1981 and 1991, 54 consecutive patients were treated by pneumatic dilation and followed up at regular intervals for a median of 13.8 years. Remission was determined with the use of a structured interview and a previously described symptom score. Duration of remission was evaluated by Kaplan-Meier estimates of time to recurrence. Predictors of outcome were determined using the log rank test.

RESULTS

Complete follow up until 2002 was obtained in 98% of all patients. Seven patients had died and were censored. A single pneumatic dilation resulted in a five year remission rate of 40% and a 10 year remission rate of 36%. Repeated dilations only mildly improved the clinical response. Patients who were older than 40 years had a significantly better outcome than younger patients (log rank test, p = 0.0014). However, the most significant predictive factor for a favourable long term outcome was a post-dilation lower oesophageal sphincter pressure of less than 10 mm Hg (log rank test, p = 0.0001).

CONCLUSIONS

Long term results of pneumatic dilation are less favourable than previously thought. Young patients and those not responding to a single pneumatic dilation should be offered alternative therapy. Patients who remain in remission for five years are likely to benefit from the longlasting treatment effect of pneumatic dilation.

Dolichomegaösophagus bei Achalasie

HISTORY AND CLINICAL FINDINGS

A 78-year-old woman suffered from achalasia since 63 years with a progressive decompensation over the last year. 53 years ago, treatment with the Stark Dilator and 24 years ago, pneumatic dilation had been carried out. Currently, the patient presented with dysphagia for liquid and solid food, with permanent retrosternal pain and regurgitation for every meal, leading to a weight loss of 10 kg.

INVESTIGATIONS

The barium esophagogram showed a marked dilation of the esophagus with retinated secretions and food. The cardia had a maximum width of 15 mm. On endoscopy, reflux esophagitis and an insufficient lower esophageal sphincter were evident.

TREATMENT AND COURSE

Transhiatal esophageal resection with gastric pull-up and cervical esophagogastrostomy was performed. The postoperative course was without complications and normal alimentation could be restored with a marked improvement of preoperative symptoms.

CONCLUSION

Esophageal resection and gastric pull up is the more favourable treatment option in elderly patients with decompensated achalasia and dolichomegaesophagus compared to a gastric tube for alimentation--adjusted to the individual surgical risk.

Subtotal esophageal resection in motility disorders of the esophagus

BACKGROUND

Esophagectomy for motility disorders is performed infrequently. It is indicated after failed medical therapy, pneumatic dilation, non-resecting surgical and redo procedures. Patient selection in this group is challenging and the operative risk has to be weighted carefully against the poor quality of life with persistent or recurrent dysphagia.

PATIENTS AND METHODS

Between September 1985 and April 2004, subtotal esophageal resections for advanced esophageal motility disorders of the esophagus not responding to previous therapy were carried out in 8 patients (6 females, 2 males). The median age of these patients was 59.5 (43-78) years. Six patients had a megaesophagus secondary to achalasia; 1 patient had a non-specific esophageal motility disorder with a stenosis of the distal esophagus, and a further patient displayed a recurrent huge epiphrenic diverticulum, which occurred in the context of a collagen disease. A transhiatal esophageal resection was performed in 6, a transthoracic procedure in 2 patients.

RESULTS

Outcome assessment was done after a follow-up of 43.5 (3-92) months in median. The resection and reconstruction of the esophagus in advanced and decompensated esophageal motility disorders led to a marked functional improvement with disappearance of dysphagia. Despite previous therapeutic failures, alimentation could be restored in all patients.

CONCLUSION

Favourable long-term results with significant improvement of symptoms can be achieved by esophageal resection even if endoscopic therapy or non-resecting surgical measures are unsuccessful. Transhiatal esophagectomy with gastric pull-up should be the preferred procedure and can be performed with low morbidity.

[Long-term outcome of myotomy and semi-fundoplication in achalasia]

The basic principle behind the treatment of achalasia consists of alleviating swallowing disorders by reducing resistance in the lower esophageal sphincter without inducing gastroesophageal reflux. Only a few studies are available on long-term results after operative treatment. Fifty-one patients were studied with regard to long-term results after open transabdominal extramucosal myotomy of the distal esophagus along with partial anterior fundoplication (Dor procedure). Clinical data were collected by standardized interviews, and symptoms were assigned a score ranging from 0 to 3 according to severity and frequency. The pre- and postoperative symptoms were comparable in 50 patients. The median duration of follow-up was 88 months (range: 12-160 months). Operative time was a median of 80 min. Two esophageal mucosal tears were recognized intraoperatively and promptly repaired. Postoperative morbidity occurred in two patients (3.9%). Very good or good long-term results after surgical therapy were achieved in 49 patients (96.1%). Forty-seven patients (92.2%) have no or rare dysphagia. The frequency of regurgitation as well as chest pain was also significantly reduced after surgery. Forty-nine patients (96.1%) either maintained or gained weight. Preoperative duration of symptoms, follow-up, age, and gender had no influence on the results (p > 0.05). Two patients (3.9%) mentioned occasional heartburn. Five patients (9.8%) took or still take proton pump inhibitors postoperatively. Severe stage IV symptoms due to peptic stricture and dolichomegaesophagus required reoperation in one patient (2%). The results show that myotomy and the antireflux procedure (semifundoplication) lead to long-term relief of dysphagia without inducing reflux at a low operative risk. Since long-term results are as yet not available for minimally invasive surgery, it remains to be seen if this operative technique will become the primary surgical procedure for this disease.

Does scant hematochezia necessitate the performance of total colonoscopy?

BACKGROUND AND STUDY AIMS

Controversy exists as to whether all patients with lower intestinal bleeding need to undergo total colonoscopy. This study compares the prevalence of colonic neoplasms in patients reporting scant hematochezia with the prevalence in controls.

PATIENTS AND METHODS

Structured interviews were carried out with 4265 consecutive patients referred for colonoscopy. Of these, 468 patients had scant hematochezia, 299 had occult rectal bleeding and 57 reported dark rectal bleeding. Patients with scant hematochezia were matched for age and sex with those having no risk factors for colorectal neoplasms. For all groups, we determined the prevalence of adenomas and cancers below and above 50 cm.

RESULTS

Colonic neoplasms were found in 18 % of patients with scant hematochezia and in 7.5 % of controls. However, most of these tumors were located within the reach of a sigmoidoscope. Compared with controls, patients with scant hematochezia had no increased risk for proximal neoplasms (odds ratio [OR] = 1.2), while this risk was significantly increased in patients with occult rectal bleeding (OR = 3.1) and patients who had observed maroon-colored blood in their stool (OR = 4.8).

CONCLUSIONS

Flexible sigmoidoscopy appears to be a sufficient work-up for young patients who have observed trace amounts of bright red blood on the surface of their stool.

Complement components and terminal complement complex in oesophageal smooth muscle of patients with achalasia

This study investigates whether patients with achalasia exhibit autoimmune reactions with subsequent complement activation within oesophageal smooth muscle, vessels and neurones. Oesophageal muscular biopsies from 8 patients undergoing surgery for achalasia and from 6 patients operated for oesophageal cancer were investigated by immunofluorescence for the presence of the complement components C1q, C4, C3c, C3d, C9 and the C9 neoantigen of the terminal C5b-C9 complement complex. Tissues were also investigated for the expression of immunoglobulins (G,A,M) and of the antigens of rubella and varicella zoster viruses. In addition, sera of both patient groups were tested for the presence of autoantibodies against Auerbach's plexus. The terminal complement complex C5b-C9 was found within muscle cells from all patients with achalasia but in only one specimen from a patient with cancer. Two patients with achalasia also exhibited the terminal complement complex as well as IgM within ganglion cells. Muscle cells stained positive for the complement component C9 in all five patients with achalasia in whom this test was performed but in none of the control tissues. In addition, sera from four patients with achalasia contained antibodies against Auerbach's plexus. Studies for the complement components C1q, C4, C3c and for antigens of rubella and varicella zoster viruses revealed negative results in all patients and controls. The results of this study suggest that a complement activation is involved in the autoimmune pathogenesis of achalasia. However, the triggering mechanism of this phenomenon remains to be determined.

[Esophageal resection in treatment of achalasia. 4 case reports and review of the literature]

In the time period between 1985 and June 2001, four of 81 patients diagnosed with achalasia were surgically treated by means of transhiatal esophageal resection. Replacement with stomach and cervical anastomosis was performed in three patients aged 8, 19, and 27 years, respectively, after initial myotomy. In one case, the esophagus resection was the primary surgical measure and the colon was used as the replacement. The preoperative symptoms of the four patients showed improvement 51, 34, 15, and 8 months after the operation, respectively. Dysphagia and regurgitation no longer occurred. One patient died 4.5 years after esophageal resection due to ulcerous bleeding of the distal redundant colon interposition. In accordance with other studies investigating serious swallowing disorders, it could be shown that transhiatal resection with esophagus-replacement through stomach pull-up can lead to symptom-relief as well as an improvement in the quality of living.

Life expectancy and cancer risk in patients with Barrett's esophagus: a prospective controlled investigation

BACKGROUND

It has been suggested that patients with Barrett's esophagus have a substantially increased risk of esophageal and possibly extra-esophageal cancers. We compared the incidence of cancer and the survival rates of patients with Barrett's esophagus with those observed in patients with achalasia, with Schatzki's ring, and in the general population.

PATIENTS AND METHODS

From 1980 through 1994, 60 consecutive patients with newly diagnosed long-segment Barrett's esophagus without dysplasia were seen in a single gastroenterology consultation office and followed until the Fall of 1999. Cancer incidence and survival rates were compared with age- and sex-matched patients with symptomatic Schatzki's ring (n = 60) and achalasia (n = 60). Survival data were also compared with those of the German population.

RESULTS

During a mean (+/-SD) observation period of 10 +/- 5 years, 2 patients with Barrett's esophagus (3%; 95% confidence interval [CI]: 0% to 11%) developed esophageal cancer, and 9 (15%; 95% CI: 7% to 27%) developed extra-esophageal cancers. These data differed only slightly from those of patients with Schatzki's ring (esophageal cancer: n = 1, 2%; 95% CI: 0% to 9%; extra-esophageal cancers: n = 9, 15%; 95% CI: 7%-27%) and achalasia (no esophageal cancers, extra-esophageal cancers: n = 3, 5%; 95% CI: 1% to 4%). Estimated 10-year survival was similar in patients with Barrett's esophagus (83%), patients with symptomatic Schatzki's ring (80%), patients with achalasia (87%), and in the general population (82%).

CONCLUSIONS

The cancer risk in patients with Barrett's esophagus has been overestimated. If patients with nondysplastic epithelium are followed, the risk of esophageal cancer is about 1 per 300 patient-years.

[Are screening programs in Barrett esophagus meaningful?]

This review analyses whether the assumption is justified that endoscopic screening in patients with Barrett's syndrome facilitates early recognition of cancer and leads to prolongation of life. It is shown that no reliable data exist that would support the latter conclusion. Although there is scant information that some patients may benefit from close surveillance, it appears unlikely that an all too ambitious surveillance program will either be cost effective or acceptable for patients and/or endoscopy centers.

Complimentary journeys to the World Congress of Gastroenterology--an inquiry of potential sponsors and beneficiaries

One of the most effective tools of pharmaceutical marketing is the distribution of gifts to physicians whose magnitude remains ill defined. This anonymous survey determines the frequency with which physicians receive travel awards from drug companies to attend International Medical Conventions and attempts to obtain the recipients' opinion on ethical and legal issues related to such sponsorships.

METHODS

A questionnaire was mailed to all members of the German Gastroenterological Association who had attended the most recent World Congress of Gastroenterology and to 30 pharmaceutical companies. Questions concerned the physician's role at the congress, the mode of payment for travel, lodging and convention fees as well as the attendees' opinion on ethical and legal issues related to sponsoring by pharmaceutical companies.

RESULTS

78% of the contacted physicians returned the questionnaire. 67% (95% CI [55, 80]) of them received compensation for their travel expenses by industry, and the majority of them stated that they would not have attended the congress if such sponsoring had not occurred. More than two thirds believed that sponsoring by drug companies neither interferes with ethical and legal issues nor affects prescribing behavior. Such opinions were more frequently expressed by sponsored than nonsponsored attendees (p = 0.003). 20% of the contacted drug companies returned the questionnaire, one of whom expressed concerns regarding the ethics of sponsorships.

CONCLUSIONS

International conventions would suffer from a significant deprivation of attendance if the attendees' expenses were not subsidized by industry. Recognition of ethical and legal issues related to such sponsoring appears to be limited and requires further discussion within the medical community.

Correlation of endoanal sonography with cross-sectional anatomy of the anal sphincter

BACKGROUND

Anal endosonography has become an important imaging method in the diagnosis of anorectal disorders. However, little information exists as to whether anal endosonography reliably defines pelvic floor structures. The aim of this study was to correlate endoanal sonography with cross-sectional anatomy and histology.

METHODS

Endosonographic tomograms were obtained from 9 human cadavers before fixation and cross-sectioning at identical levels. Muscular layers were defined by visual inspection, histology, immunohistology, and morphometry using three-dimensional sphincter reconstructions.

RESULTS

Endosonography visualized only two muscular layers, whereas anatomic sections always revealed three. Comparisons revealed identical findings with regard to internal sphincter volumes and asymmetries. However, due to its failure to identify the longitudinal muscle, endosonography largely overestimated external sphincter volumes. In contrast to current beliefs, anatomic studies failed to detect striated muscle fibers within the longitudinal muscle and did not show an intersphincteric space. However, anatomic cross sections demonstrated "anterior bands" as newly described anchoring mechanisms for the anal sphincters.

CONCLUSIONS

Anal endosonography supplies accurate information with regard to internal anal sphincter dimensions, but does not reliably outline deeper muscular layers. However, despite these drawbacks, comparisons of modern imaging techniques with cross-sectional anatomy may enhance our understanding of pelvic floor anatomy.

Diagnostic significance of nuclear p53 expression in the surveillance of Barrett's esophagus--a longitudinal study

The efficacy of currently performed surveillance in patients with Barrett's esophagus (BE) is substantially compromised by shortcomings of dysplastic lesions as diagnostic markers. The aim of this study was to evaluate the possible role of p53 protein expression as complementary method in the diagnosis of neoplastic transformation in BE. A longitudinal study was performed. 41 patients were enrolled. The median time of surveillance was 46 months. 234 archival paraffin blocks containing a total of 627 biopsies were retrieved. p53 protein immunostaining by application of the monoclonal antibody DO-1 was performed. The results of immunohistochemistry were compared with the exact histopathological diagnosis and grading of dysplasia (no dysplasia, indefinite for dysplasia, low-grade dysplasia, high-grade dysplasia, carcinoma). In merely four of 206 nondysplastic mucosal sites p53 expression was found. However, p53 expression was detected with increasing frequency in sites indefinite for dysplasia (2/9), specimens with low-grade dysplasia (9/15), high-grade dysplasia (3/3) and the one with a carcinoma. This study shows a close association of nuclear p53 protein expression to the process of neoplastic transformation in Barrett's epithelium. However, it apparently does not precede the appearance of dysplasia significantly. Thus, nuclear p53 expression as detected by immunohistochemistry may serve to confirm a suspected diagnosis of dysplasia in BE.

Chest pain in achalasia: patient characteristics and clinical course

BACKGROUND & AIMS

In this prospective study, the prevalence of episodic pain in patients with achalasia was investigated, risk factors for its occurrence were determined, and its long-term clinical course was evaluated.

METHODS

Over an 18-year period, patients with newly diagnosed achalasia were followed up at 2-year intervals. At the first visit and after each treatment, all patients underwent manometric, endoscopic, and radiographic examinations. In addition, structured interviews were performed during each patient visit and at 2-year intervals. Potential risk factors for the presence or absence of chest pain were evaluated with the use of a logistic model. To determine the evolution of this symptom, Kaplan-Meier life-table analyses were performed.

RESULTS

Among 101 patients with achalasia, 64 reported chest pain and 37 had never had this symptom. Neither manometric nor radiographic findings predicted the occurrence of retrosternal pain. However, patients with chest pain were significantly younger than those without, and they had a shorter duration of symptoms. Treatment with pneumatic dilatation or myotomy effectively diminished dysphagia but had little effect on the occurrence of retrosternal pain. However, over a course of several years, chest pain diminished in most patients and disappeared in a minority of them.

CONCLUSIONS

Chest pain is a common symptom of achalasia and predominantly affects younger patients. Its cause remains unknown, and no treatment exists to effectively relieve this symptom. However, with advancing age, the frequency of chest pain will spontaneously diminish in most patients.

Complications and adverse effects of colonoscopy with selective sedation

BACKGROUND

Cardiopulmonary adverse effects are commonly observed in patients undergoing colonoscopy with sedation. This study determines the incidence of such events when sedation is given only when required.

METHODS

In 2500 consecutive patients, colonoscopies were started without premedication but sedation was offered if significant discomfort occurred. Parameters of blood pressure, heart rate, oxygen saturation and patient appearance were continuously recorded by a nurse assistant. Additional adverse effects occurring during or after the procedure were noted in the patients' protocol. Risk factors for the development of complications were evaluated with the use of a logistic regression model and the odds ratio.

RESULTS

Ninety-five percent of all patients required neither sedation nor analgesia. Adverse effects occurred in 59 patients (2. 4%). Twenty-six of these patients (1.0%) had short-lasting episodes of oxygen desaturation and 22 patients (0.9%) experienced vasovagal reactions. Mechanical complications occurred in a total of 8 patients (0.3%) and consisted of 2 perforations and 6 episodes of hemorrhage. In the logistic regression model, impaired physical status was the single most important risk factor for the development of cardiopulmonary complications (odds ratio 4.7; 95% confidence interval [2.0, 11.4]).

CONCLUSIONS

In experienced hands, patients undergoing colonoscopy rarely require sedation. If selective sedation is used, cardiopulmonary adverse effects occur in approximately 2% of all patients, most of whom require no medical intervention.

The impact of open access 24-h pH-metry on the diagnosis and management of esophageal reflux disease

OBJECTIVE

This study investigates whether the results of 24-h pH-metry can be predicted from clinical information and whether they affect patient management.

METHODS

A total of 200 consecutive patients referred for 24-h pH-metry underwent structured interviews as well as endoscopic and manometric investigations. The most recent 53 patients were prospectively followed to determine the impact of pH monitoring on long term management.

RESULTS

Among a variety of risk factors, the presence of lower esophageal sphincter hypotension (OR = 3.3) and erosive esophagitis (OR = 2.3) were highly predictive of a pathological pH test result. If both abnormalities were present, the risk for an abnormal 24-h pH study increased by a factor of seven. Twenty-four-hour pH monitoring led to an immediate change in management in 42% of all investigated patients. However, such alterations in therapy were maintained for prolonged periods in less than half of them and only 6% of all patients associated changes in management with an improvement of symptoms.

CONCLUSIONS

The results of "open access" 24-h pH-metry are often predictable, and only a minority of patients benefit from this procedure in terms of a change in therapy and an improvement of symptoms.

Anal ultra slow waves: a smooth muscle phenomenon associated with dyschezia

Anal ultra slow waves (USWs) have been described in a variety of anorectal disorders, all of which may be associated with constipation. We investigated whether they represent a marker for dyschezia and whether their occurrence can be modified. Manometric and endosonographic studies were performed in 25 patients with dyschezia, in 25 age- and sex-matched controls, and in an equal number of patients with hemorrhoids. Patients exhibiting ultra slow waves were repeatedly studied with and without local administration of isosorbide dinitrate. In addition, we determined whether stimulatory maneuvers modify the occurrence of USWs. Anal USWs were persistently found in 56% of patients with dyschezia, in 8% of patients with hemorrhoids, and in none of the healthy controls. They were stimulated by anal squeeze and completely abolished by local administration of isosorbide dinitrate. Ultra slow waves always occurred in conjunction with an increase in anal resting pressure and were tightly associated with a fluctuation in slow wave amplitude. Anal sphincter morphology was similar in patients with dyschezia and in controls. We conclude that anal USWs occur most frequently in patients with dyschezia and indicate smooth muscle dysfunction. Treatment directed at abolishing this motor phenomenon may represent a novel approach to the management of patients with dyschezia.

Complications and their impact after pneumatic dilation for achalasia: prospective long-term follow-up study

BACKGROUND

With the exception of esophageal perforations, complications of pneumatic dilation are incompletely defined. This study analyzes the incidence of all complications of this procedure and their impact on the patients' clinical course.

METHODS

Sixty-seven consecutive patients with achalasia underwent pneumatic dilation with a Browne-McHardy dilator. Patients were observed for 24 hours after treatment and evaluated 4 weeks later as well as at 2-year intervals for a mean follow-up period of 4.9 +/- 3.8 years. In patients with and without complications, the length of remission was evaluated by Kaplan-Meter life table analysis.

RESULTS

Twelve patients (18%) developed morphologic complications consisting in one perforation, two intramural hematomas, and nine diverticula at the gastric cardia. Ten patients (15%) complained of prolonged postdilation chest pain. The 5-year remission rate in the latter patients was 51% compared to 42% for patients without complications and 11% for patients developing traumatic diverticula. Surgery was ultimately performed in one third of all patients, a rate that remained unaffected by the type of complication.

CONCLUSIONS

Complications of pneumatic dilation are underestimated and underreported. More than 30% of all patients develop either prolonged pain or morphologic lesions. Although prolonged pain does not indicate an unfavorable prognosis, the appearance of diverticula may be associated with a shorter clinical remission.

Risk factors for diagnostic delay in achalasia

This study investigates whether the frequently delayed diagnosis of achalasia is attributable to atypical symptoms, misleading diagnostic features, or the number of physicians consulted. Eighty-seven consecutive patients with newly diagnosed achalasia were prospectively investigated with the use of structured interviews as well as manometric, endoscopic, and radiographic studies. The mean duration of symptoms was 4.7 +/- 6.4 years. Quality and intensity of symptoms had no effect on early diagnosis. Among different radiographic and manometric features, only the width of the gastric cardia showed a significant correlation with a delay in diagnosis (P < 0.01). However, the most significant association was found between the duration of symptoms prior to considering the diagnosis of achalasia and the number of unsuccessful physician consultations (P = 0.001). We conclude that the frequent delay in the diagnosis of achalasia is not due to an atypical clinical presentation of this disease but rather to misinterpretation of typical findings by the physician consulted.

Colonoscopy without premedication versus barium enema: a comparison of patient discomfort

BACKGROUND

Colonoscopy is considered a painful procedure requiring routine intravenous sedation. We investigated whether unsedated colonoscopy causes more discomfort than barium enema.

METHODS

Procedure-related discomfort was determined in 100 consecutive patients undergoing colonoscopy without premedication and in an equal number of patients referred for sigmoidoscopy and barium enema. All patients underwent such examinations for the first time and had no history of previous bowel surgery. During colonoscopy, sedation was offered if significant pain or discomfort occurred.

RESULTS

In patients without stenosis and with satisfactory preparation, the completion rate of colonoscopy was 95%. Five percent of all patients undergoing endoscopy required sedation. On an analog scale ranging from 1 to 9, patients undergoing colonoscopy and barium enema reported similar ratings for procedure related discomfort (3.2 +/- 1.7 and 3.1 +/- 1.9) and for discomfort caused by bowel preparation (3.2 +/- 2.1 and 3.1 +/- 1.8). Eighty-seven percent of all patients undergoing colonoscopy stated that they would prefer no premedication in the event of repeated examinations.

CONCLUSIONS

Colonoscopy with sedation on demand does not cause more discomfort than barium enema and will be accepted by the vast majority of patients undergoing this procedure.

Anorectal function and morphology in patients with sporadic proctalgia fugax

PURPOSE

The pathophysiology of sporadic proctalgia fugax remains unknown. This study investigates whether patients with this syndrome exhibit alterations in anal function and morphology.

METHODS

Eighteen patients with sporadic proctalgia fugax and 18 sex-matched and age-matched healthy controls were studied. Manometric studies investigated anal resting and squeeze pressures, the rectoanal inhibitory reflex, rectal compliance, and smooth muscle response to edrophonium chloride administration. External and internal sphincter thickness was measured endosonographically.

RESULTS

Patients had slightly higher (P = 0.0291) anal resting pressures (65.5 +/- 11.4 mmHg) than controls (56 +/- 9.9 mmHg). However, anal squeeze pressure, sphincter relaxation during rectal distention, and rectal compliance were similar in both groups, and no alterations were detected in external and internal anal sphincter thickness. Edrophonium chloride administration was followed by sharp postrelaxation contractions in two patients, whereas anal function remained unaltered in controls. Acute episodes of proctalgia, which occurred in two patients while under study, were associated with a rise in anal resting tone and an increase in slow wave amplitude.

CONCLUSIONS

In the resting state, patients with proctalgia fugax have normal anorectal function and morphology. However, they may exhibit a motor abnormality of the anal smooth muscle during an acute attack.