Surgical management of achalasia in Zaria, Northern Nigeria.
Achalasia is not a common disease in sub-Saharan Africa, with only about 3 patients per year seen in our hospitals. (21-23) Many of these patients present with longstanding dysphagia for both liquids and solids, and symptoms of severe malnutrition. In elderly patients, the differentiation between primary and pseudo-achalasia becomes critical. In pseudoachalasia, oesophageal motor dysfunction is not caused by a primary denervation disorder but rather by neoplasm or postoperative obstruction of the oesophagogastric junction. In general, patients with pseudo-achalasia are older and have a shorter history of dysphagia and weight loss. There are very few reports evaluating the outcome of management of achalasia from the West African sub-region. (21,22) We present here our recent experience in the management of primary achalasia in a setting with limited diagnostic and therapeutic facilities. We also evaluate the outcome of treatment and preoperative factors that affect it.
Patients and methods
This retrospective study was carried out in the Department of Surgery of Ahmadu Bello University Hospital in Zaria, Northern Nigeria. All adult patients who were seen and treated for achalasia of the cardia between 1991 and 2006 were included. Diagnosis of achalasia was based on clinical symptom assessment and barium swallow examination. Dysphagia was defined as mild when occurring with solid food, moderate with semi-liquid food, and severe with liquid food. Preoperative evaluation included detailed history and physical examination, barium oesophagogram and transabdominal ultrasonography. Serum urea and electrolytes, full blood count and chest radiograph were also performed. During the postoperative period, patients were asked about their symptoms with emphasis on dysphagia, regurgitation and heartburn. A barium oesophagogram was requested 2 weeks after surgery or whenever the patient complained of recurrent dysphagia or regurgitation. Facilities for oesophageal manometry and pH testing were not available. Patients were divided into 3 stages based on oesophageal diameter determined by oesophagogram, as previously described. (13) Oesophageal diameter was measured at the site of maximum oesophageal dilatation. Stage 1 was defined as <40 mm, stage 2 as 40 - 70 mm, and stage 3 disease as >70 mm. The diameter of the narrowed oesophageal segment was measured at the gastro-oesophageal junction.
The patients were resuscitated with appropriate fluid and electrolytes. Nutritional rehabilitation and correction of anaemia ware also carried out. Chest infection was treated with antibiotics. Treatment was by modified Heller's operation, transabdominally without a complementary antireflux procedure. According to protocol, care was always taken to avoid excessive posterior dissection and not to extend the myotomy more than 1 cm on the gastric end. Treatment was considered a failure when there was no improvement in dysphagia or there was an increase in maximum oesophageal diameter postoperatively. Information was obtained from patients' case notes, ward admission records and operation registers. This information was analysed for age, sex, symptoms, treatment and outcomes.
Data were entered into SPSS statistical software (version 13.0, SPSS, Chicago, IL). Data were reported as proportions, means [+ or -] standard deviations (SD) or medians. Categorical variables and proportions were compared by Fisher's exact test. Wilcoxon's test was used to compare the preoperative and postoperative results of clinical (dysphagia, regurgitation and heartburn) and radiological evaluation. Logistic regression modelling was performed to identify independent preoperative factors significant for prediction of poor outcome. Factors included in the model were age, sex, severity of preoperative dysphagia, oesophageal dilatation and distal oesophageal narrowing. The level of significance was established at p<0.05.
There were 47 patients, 31(66.0%) males and 16 (34%) females. Their ages ranged from 16 - 58 years with a mean of 34.6[+ or -]9.8 years. Patients <40 years constituted 72.3%. All patients had dysphagia at presentation (Table I). In 44 (93.6%) patients, dysphagia was experienced at every attempt at feeding. The severity of dysphagia before and after treatment is shown in Fig. 1. The duration of symptoms ranged from 9 to 132 months with a mean of 37.6[+ or -]1.5 months. Twenty-one (44.7%) patients had had symptoms for more than 72 months.
Chest radiograph showed widened mediastinum and air-fluid levels in 38 (80.8%) patients. Barium swallow examination showed evidence of stasis and a dilated oesophageal body with a narrowed distal end in all patients. In 25 (53.2%) patients, aperistalsis of the oesophageal body was demonstrated on fluoroscopy. Two elderly patients underwent rigid oesophagoscopy and biopsy. Transabdominal ultrasonography did not reveal tumours in the oesophagogastric region in any patient. The maximum oesophageal diameter preoperatively was 34.0 - 89.0 mm with a mean of 67.4[+ or -]12.7 mm. Stage 3 disease was found in 30 (63.8%) patients, while stages 2 and 1 disease were found in 11 (23.4%) and 6 (12.8%) patients, respectively. Only 18 patients had a postoperative barium swallow examination (Fig. 2). Other patients refused to repeat the barium study because they were relieved of symptoms and saw no need to incur additional expenses in this investigation. Postoperatively, the maximum oesophageal diameter recorded in 18 patients was 28.0 - 72.0 mm with a mean of 37.5 [+ or -] 8.2mm --significantly lower than preoperative values (p=0.001). The preoperative diameter of the narrowed oesophageal segment was 1.0 - 11.0 mm with a mean of 4.6 [+ or -] 2.5 mm, compared with a mean of 11.6 [+ or -] 1.8 mm postoperatively (p=0.015).
The oesophageal incision, recorded in 42 (89.4%) patients, ranged between 50.0 mm and 100 mm, with a mean of 80.0 mm. There were 4 (8.5%) perforations of the oesophageal mucosa, which were repaired immediately. Postoperative morbidity occurred in 5 (10.6%) patients, including 4 (8.5%) wound infections and 1 (2.1%) case of pneumonia. One patient died postoperatively--a 56-year-old man who had had progressive dysphagia for 10 years. He was malnourished and had 2 previous admissions for bronchopneumonia, the last being 2 months before he presented at our hospital. His preoperative maximum oesophageal diameter was 82 mm. He had good relief of dysphagia postoperatively. He aspirated and died 1 week after surgery. In general, the duration of hospital stay was 7 - 18 days with a mean of 10 days.
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Follow-up ranged between 2 weeks and 42 months with a median of 6 months. On discharge from hospital, 41 patients (87.2%; p<0.001) had complete relief of dysphagia, regurgitation and heartburn. Three (6.4%) additional patients had significant improvement of dysphagia. In 4 patients, heartburn persisted after operation, and they are being treated with antacids. Twenty-seven (57.5%) patients were seen 3 - 9 months after operation. All of them maintained complete relief of dysphagia, regurgitation and heartburn as had been achieved at the time of discharge from hospital. Eight patients with preoperative weight loss had gained weight when seen 3 - 6 months after surgery.
Of the 6 patients with incomplete relief of dysphagia, 5 (83.0%) had severe preoperative dysphagia, while 26 (84.0%) of 31 patients with severe preoperative dysphagia had complete relief of symptoms postoperatively (likelihood ratio 4.5, p=0.07). The 6 patients with incomplete relief of dysphagia also had stage 3 (>70 mm) preoperative oesophageal dilatation, compared with 24 (80.0%) of 30 patients with stage 3 disease who had complete relief of symptoms (likelihood ratio 3.8, p=0.25). Using regression modelling, none of the selected variables attain statistical significance as a predictor of dysphagia after surgery. However, the likelihood of incomplete relief of symptoms was higher in patients with severe dysphagia, male patients and those with stage 3 preoperative oesophageal dilatation.
In developed countries, achalasia of the cardia is diagnosed manometrically by complete absence of primary peristalsis of the oesophageal body, failure of the LOS to relax, and elevated LOS pressure and pressurisation of the oesophagus, both in approximately 50% of cases. (2,3,24) In addition, barium swallow and 24-hour pH monitoring are always added to the diagnostic and therapeutic evaluations. (24) In our patients, diagnosis of achalasia was possible to a high degree of accuracy, given the symptom complex of longstanding dysphagia, regurgitation and weight loss together with barium swallow showing delayed emptying, dilatation of the oesophageal corpus and bird's beak-shape narrowed distal oesophagus.
Occasionally, difficulties are encountered in distinguishing primary from secondary achalasia, especially in elderly patients. In this as in another report, transabdominal ultrasonography was used to differentiate between normal oesophagogastric junction and functional or organic obstruction of the distal oesophagus, (25) as it provides information on oesophageal wall thickness and shows the contours of the distal oesophagus and its surroundings, which are important in determining organic obstruction of the oesophagogastric junction. The long duration of symptoms in our patients is probably attributable to the slow progression of the disease, some ability to push down the food by drinking a large amount of water, and absence of severe pain. In our patients as in others, parotid swelling indicated malnutrition. (22,23)
The most important outcome for the patient with achalasia is relief of dysphagia. Surgical myotomy is superior to pneumatic dilatation in providing long-term relief of dysphagia. (8,26-28) However, many physicians still favour pneumatic dilatation because laparotomy and thoracotomy are associated with more postoperative pain and morbidity and longer hospital stays. With the introduction of laparoscopic surgery, surgical myotomy has regained primacy in the treatment of achalasia. (2,8,27) In developing countries, facilities for laparoscopic surgery are limited, and access to reference centres and cost of treatment are still an issue. All our patients had open modified Heller's operation, as was the case in other reports from our sub-region. (21-23) We found the transabdominal approach quicker, simpler and less tasking to other supporting staff, especially during the early postoperative period. (21) This route also allows the assessment and treatment of any concurrent intra-abdominal disease. (29) It is established that relief of dysphagia and regurgitation is dependent on the degree of relief of outflow obstruction. In our patients, relief of the distal oesophageal obstruction was evidenced by a significant decrease in the maximum oesophageal diameter (p=0.001) and increased diameter of the most narrowed oesophageal segment (p=0.015). These changes resulted in significant relief of dysphagia and regurgitation. In this as in other reports, a few patients remained with some degree of oesophageal dilatation, despite complete relief of symptoms. (3,24)
The need for and choice of antireflux procedure remains controversial. Previous studies have shown that good relief of dysphagia with low incidence of reflux symptoms can be achieved without additional antireflux procedures by avoiding excessive posterior dissection and limiting the myotomy to 0.5 - 1 cm onto the stomach. (18,20,21) This was the finding in our patients. However, recent studies have indicated that a Heller myotomy and Dor procedure should be the treatment of choice for achalasia (14,17,27) because it is associated with good relief of dysphagia and a low rate of GOR as determined by 24-hour pH monitoring. Suturing the gastric wall to the edges of the myotomy, according to the Dor technique, also maintains the edges of the myotomy open, thus preventing the consequences of scar tissue repair, and covers any undetected perforation of the oesophageal mucosa thereby preventing any significant postoperative morbidity. (14,17) Preoperative heartburn may be due to food stagnation and bacterial growth in the distal oesophagus, or fermentation of retained food, (30) which improves with improved emptying of the oesophagus. None of our patients developed new-onset heartburn in the postoperative period. However, this does not exclude GOR, which may be asymptomatic in about a third of patients. (30)
Among the various preoperative factors, LOS pressure, severe dysphagia and oesophageal dilatation have been shown to have some correlation with treatment outcome. (2,21) In the present study, none of the evaluated factors have statistically significant correlations with treatment outcomes. This agrees with other reports following oesophagomyotomy. (2,27,30) Reports following laparoscopic cardiomyotomy have shown that only preoperative LOS pressure has significant correlation with outcome of treatment. (18,31) However, in our patients, the likelihood of poor outcome was higher in severe dysphagia, male patients and those with stage 3 oesophageal dilatation.
The retrospective nature of our data may be considered a limitation of this study. In addition, lack of long-term follow-up may preclude detection of long-term outcome measures including recurrence of dysphagia, regurgitation or heartburn. However, symptom relief obtained at 6 months was sustained during long-term follow-up in the majority of patients. (3,8,23) Lack of pH and manometric evaluations was also a limitation.
In conclusion, achalasia is rare in our environment, where diagnostic and therapeutic facilities are limited. However, it can be accurately diagnosed with a symptom complex of longstanding progressive dysphagia, regurgitation and weight loss, and a timed barium swallow examination. A modified Heller's operation will provide lasting relief of symptoms and improved oesophageal morphology in most patients. However, patients with severe preoperative dysphagia or stage 3 oesophageal dilatation may have a greater chance of incomplete relief of symptoms following myotomy.
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A. AHMED, F.W.A.C.S.
L. M. D. YUSUFU, F.M.C.S. (NIG.), F.W.A.C.S.
Y. A. UKWENYA, F.M.C.S. (NIG.), F.W.A.C.S.
L. KHALID, F.M.C.S. (NIG.), F.W.A.C.S.
E. S. GARBA, F.W.A.C.S.
Division of General Surgery, Ahmadu Bello University Hospital, Zaria, Nigeria
TABLE I. SYMPTOMS AND SIGNS IN 47 PATIENTS Preoperative Postoperative Symptoms No. % No. % Dysphagia 47 100.0 0 0.0 Regurgitation 33 70.2 0 0.0 Heartburn 12 25.5 4 8.5 Weight loss 10 21.3 2 4.2 Parotid swelling 5 10.6 2 4.2 Cough 4 8.5 0 0.0
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|Title Annotation:||General Surgery|
|Author:||Ahmed, A.; Yusufu, L.M.D.; Ukwenya, Y.A.; Khalid, L.; Garba, E.S.|
|Publication:||South African Journal of Surgery|
|Date:||May 1, 2008|
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