Malignant oesophageal strictures: a review of
Transcription
Malignant oesophageal strictures: a review of
Br. J. Surg. Vol. 69 (1982) 61-68 Printed in Great Britain Proffered review Malignant oesophageal strictures: a review of techniques for palliative intubation RICHARD EARLAM AND J. R.CUNHA-MELO The London Hospital, Whitechapel, London El IBB. A review of the different designs for palliative oesophageal intubation tubes confirms Souttar's original suggestion that they should be flexible, incompressible, non-traumatic, compact, have an adequate lumen and stay in place. The internal diameter should be at least 10mm. The thickness of the wall should be about 1 mm. The length will vary according to the stricture and should be as short as possible, provided that the proximal rim prevents future longitudinal growth occluding the lumen. Various methods of achieving the ability to stay in place are described, which comprise either a large proximal rim or a roughened barrel. No details about results are given because the original patient populations vary so much. Success probably depends more on the technical expertise and experience of the surgeon than specific variations in design. Dysphagia is the leading symptom in oesophageal cancer and its relief must be the main aim of treatment. Approximately 60 per cent of all patients with squamous cell carcinoma of the oesophagus have extensive tumours that cannot be resected (1,2). In one large series, 45 per cent had intubation because they were unsuitable for surgery (3), but even after surgical resection about 20 per cent will have further dysphagia either due to recurrence or a stricture at the site of the anastomosis (4, 5). Similarly, radiotherapy is followed by dysphagia in over 25 per cent, usually caused by a fibrotic cicatricial narrowing rather than local recurrence (6). The treatment of dysphagia by oesophageal dilatation is essentially similar to that for a benign stricture but with additional complications due to the nature of the malignant process. The minimal requirement is for the patient to swallow his own saliva and since this is often thick he will easily swallow clear liquids through such a lumen. Patients can survive on modern clear fluids such as Vivonex, Amicalorin, Aminutrin or Clinifeed for months. Any large lumen will enable more solid food to be taken. There is a mistaken idea that normality is the perfection that should always be achieved. The average length of time with symptoms prior to diagnosis is over 6 months (1,7) and perhaps some patients are not really worried by some trouble swallowing food. Each patient has his threshold for what suits him and many are happy if they can settle down with their spouse to the same food, provided it is minced or mashed and they can eat slowly in their own time. A recent study has confirmed that over 50 per cent of patients with oesophageal cancer die in hospital (8). If treatment cannot achieve a radical cure then surely it should enable the patient to die at home if he and the relatives so wish under the care of his family doctor who can treat all his other difficulties symptomatically but relies on the surgeon to deal with the mechanical problems of stenosis or fistula. In the past 25 years there has been more interest in the subject of palliative intubation. Numerous tubes have been described and their sizes, materials and special properties are listed in Table I. Presently available ones may be suitable or new tubes require invention, but what may be lacking is the experience in using them. This paper is concerned primarily with the technology of intubation. Indications for palliation, which are closely connected with non-resectability, are not discussed; nor are the results included, because they vary so much with the patient population and details are given in the individual papers ciled in Ihe text. Optimal diameter of the oesophageal lumen Every individual has a different optimal diameter for an oesophageal stricture because it depends on the actual nature of the obstruction, its degree of elasticity, length, the power of the muscle pushing the bolus through as well as the patient's threshold for tolerating discomfort on swallowing. It is not possible to be dogmatic, therefore, about the minimal diameter to be achieved by dilatation, but it is the authors' aim with malignant strictures to achieve dilatation to at least 10mm diameter or 30 FG. Using modern techniques, this can almost always be achieved with repeated dilatations so there is no reason to accept a smaller diameter. The internal diameter of most palliative tubes lies between 10 and 12mm, with only a few being 14 or 15mm. Larger tubes are not used because a stricture which can be dilated to more than 15 mm diameter or 45 FG does not need an indwelling tube. The only justification for inserting a tube with a large lumen is to block off a fistula unaccompanied by narrowing of the oesophagus. A tube will maintain a given lumen but there are several methods other than simple dilatation to achieve this. They are all based on the fact that most oesophageal tumours are proliferative and the tumour itself encroaches on the lumen to narrow it, frequently leaving the muscle walls themselves widely separated. Radiotherapy gradually causes necrosis of the tumour and then the act of swallowing removes the dead tissue. Occasionally, radiotherapy gives no relief because patients have had a complete oesophageal block prior to the start of the course. In such a case, dilatation or reaming out the lumen will enable the scouring process to begin. Barlow's borer (9) or reamer (see Fig. 1) is the only instrument specially designed for this. Heat provided by diathermy (10) and extreme cold from cryosurgical probes have also been used (11). None of these particular methods changes the natural history of the disease but does achieve symptomatic relief. Historical aspects The great advances of the past century in palliative intubation were made in the 1880s. There were several case reports of catheters being passed enabling a patient to obtain nutrition and survive for a few months (12-16). Sir Charles Symonds is usually cited as the first to use an indwelling tube rather than a catheter in 1885 (17,18). This relied for its fixation on strings emerging through the nostrils and tied behind the ears but in another method it was attached to the moustache, if available. In 1845 a French surgeon Leroy d'Etoilles had used a short R. Earlam and J. R. Cunha-Melo 62 ATKINSON Keymed MOUSSEAU-BARBIN CELESTIN simple PALMER CELESTIN flange COLLIS PROCTER-LIVINGSTONE COYAS SACHS DIDCOTT SOUTTAR STIRNEMANN HOLINGER MACKLER TYTGAT (a) TYTGAT (b) Malignant oesophageal strictures 63 BARLOW'S BORER GUISEZ GOTTSTEIN NOTTINGHAM INTRODUCER Fig. 1. Various designs for palliative oesophageal intubation tubes. tube of decalcified ivory (19). Symond's tube was made of boxwood and ivory. Although oesophagoscopy had already been developed, by Kussmaul (20) and Mikulicz (21), tubes were placed blindly at this time. In 1901 Gottstein (22) developed a short rubber tube with an inverted funnel top and a rim distally which did not require strings for fixation (see Fig. 1). This was developed later by Guisez (22,23), who used a tube with a de Pezzer catheter type of end (see Fig. 1). In his article there is an illustration of a small tube of earlier design held in place by strings. The Mosher plug was another method (24). The honour for developing an indwelling palliative tube with no external fixation must go to Gottstein in 1901; previous attempts had succeeded in isolated cases but his tubes were of more practical use. In 1924 the next progress was made by Sir Henry Souttar who developed a tube based on the design of a spring and held in place by the roughness of its exterior and a proximal lip (25). Souttar was an engineering student at Oxford before becoming a surgeon at the London Hospital so his knowledge of the accurate measurement needed helped him in producing this tube. It was originally made of German silver covered with gold plating. The secondary spiral in the spring appeared later (26,27) and, in the Souttar tube modified by Professor Leigh Collis, was lost (28). These tubes were all smaller than the lumen of the rigid oesophagascopes available and were inserted under direct vision through the oesophagoscope and not blindly. For the next 30 years there was no great interest in palliative intubation. It was, however, apparent that there was a demand for a tube that could be pulled downwards through an obstruction in the oesophagus, cardia or upper stomach, whereas the Souttar tube was only suitable for pushing from above. The Mousseau-Barbin tube was the first of this type to be designed in 1956 with a long leading catheter end (29). In 1959 this was developed by Celestin and later manufactured in latex rubber rather than plastic (30-32). In an article dated 1974 (33), detailing the methods and attempting to assess the best tube available, there were only 2459 patients described in the literature between 1960 and 1971, which is not many considering that the need for palliation is so high. Exceptions to this were two large series described by O'Connor (34) and Mounler-Kuhn (35). Recently, there has been a change of emphasis and Procter has described his own personal experience in over 2000 patients (36). Although most tubes can be divided into either push or pull types, there has recently been a solution to the problem of how to 'push a piece of string'. The Celestin tube, which was originally designed for the pull method, was first actually pushed in 1974 (37) and now a commercially available method has been developed by Atkinson (38-40) and called the Nottingham introducer (see Fig. 1). Throughout the years, attempts have been made to excise a portion of the oesophagus and bridge the gap with a prosthesis. Experimentally, this was achieved in dogs (41) and then the same technique was applied to one patient (42). Replacement of a segment of the thoracic oesophagus has been attempted but is not accepted as a practical procedure because of the danger of mediastinal leaks (43). Replacement of portions of the cervical oesophagus, after pharyngolaryngectomy, is more successful (44-46). The majority of indwelling tubes that had an opening to the exterior were brought out through the nostril but attempts have been made to ease the patient's discomfort by bringing them out through the cervical oesophagus below the cricopharyngeal sphincter (47-51) or above through the pyriform fossa (52). Technical aspects Material: The different materials and their properties are summarized in Table II. The majority of the new tubes are plastic. The essential properties of flexibility and incompressibility which can be provided by the old materials of reinforced rubber or a stainless steel spring have not been improved by the modern ones. Even with plastic there is a certain thickness below which the tube is too easily compressed. Internal diameter: The majority of the tubes have an internal diameter between 10 and 12 mm. Those with the figure 12-5 mm merely reflect a conversion of the imperial measurement of half an inch to metric size. American plastic tubing comes in such measurements (53,54). Historically, Chevalier Jackson considered that half an inch (12-5 mm or 39 FG) was sufficient diameter for dilatation of a stricture to enable swallowing to be improved. Wall: The thickness depends on the material used. Technically, it is difficult to obtain a thickness ofless than 1 mm. The thicker the wall, the greater the outside diameter becomes and obviously this should be minimized. Outside diameter: From Table I it will be seen that the majority have an external diameter of between 14 and 17 mm. Some have a measurement of 18mm, which is 54 FG. This is probably an unacceptably large size because dilatation to such a diameter relieves dysphagia in the majority of patients. A size of 15mm or 45 FG seems to be the maximum acceptable. For any given outside diameter the largest lumen is provided by those with the thinnest walls such as the Goni, Mousseau-Barbin, Sachs and Souttar tubes. Proximal end: The majority of tubes depend on the size of the proximal end (Fig. 2) to prevent them slipping downwards into the stomach. Some have a thin collar, 1-2 mm wider in diameter than the barrel, but this is too small a limit for safety because it loosens due to movement and pressure necrosis. A proximal end that is much wider serves the two purposes of (a) preventing distal displacement and (h) directing the bolus into a narrowing. The shapes can be subdivided as follows: collar (Souttar), funnel (Palmer), cup (Mousseau-Barbin and Palmer) and tulip (Celestin). The tulip shape was developed to prevent the rim intussuscepting if floppy or causing pressure necrosis if it were more firm. If the soft end, when compressed, is still too rigid, R. Earlam and J. R. Cunha-Melo Table I: PALLIATIVE TUBES Year Reference Atkinson 1978 (38-40) Push Celestin 1959 (30-32) Laparotomy Pull Push Author Method ID (mm) OD (mm) Silastic rubber 11 15 2 14 12 15 1-5 34 11 13 1 7 2 13 Material Wall (mm) Length (cm) Collis 1971 (28) Push Originally polyethylene then latex rubber with nylon reinforced spiral Stainless steel Coyas 1955 (61,84) Push Polyvinyl 10 14 Didcott 1973 (82-84) Push Stainless steel wire embedded in rubber 1 6 ? ? Polyvinyl Polyethylene 10 15 14 17 2 1 40 40 Fell Goni 1966 1964 (85) (86, 87) Pull Pull 9 11 15 19 Gourevitch 1959 (88) Pull Armoured latex rubber ? ? ? 16 Haring 1964 (58, 89) Pull 13 17 2 9,12,18 Holinger 1955 (59) Push Latex rubber reinforced with stainless steel Polyvinyl 7-10 ? ? 7-12 Mackler 1954 (90) Thoracotomy Polyvinyl ? 9-12 ? ? MousseauBarbin 1956 (29,91) Pull Neoplex 10 14 12 16 1 30 + 70 Palmer 1970 (53,55, 92-94) Push Tygon R8420 12-5 15-7 1-6 Any Latex rubber armoured with monofilament nylon Nylon 12 18 3 10,15,19 8 10 1 ? Gold plated German silver A 8 BIO 10 12 1 5-20 C12 14 1968 Sachs 1959 Souttar 1924 (36,95-98) Push (66) Push (7,25-27) Push Funnel top (29 mm) with non-return flange Proximal end tulipshaped (28 mm) distal end tapered but can be cut or trimmed, later distal flange } ^ ProcterLivingstone Comments Stirnemann 1965 (99,100) Pull Porflex 11 14 1-5 ? Tytgat 1976 (54,65) Push Tygon R3693 Tygon R8420 12-5 15-7 1-6 8-35 Weisel 1959 (101,102) Push Polyethylene 10 13 1-5 10-25 Similar to Souttar but stainless steel and no spiral in the body Proximal collar projecting 1-5 mm with metallic ring for radiology, body has multiple rings Self expanding, when compressed it elongates and narrows for ease of insertion Proximal end 3 mm rim (23mmOD), distal end duckbilled Proximal end funnelshaped distal end bevelled Proximal end soft funnel Both ends mushroomshaped de Pezzer catheter shape Proximal end funnelshaped, inserted after opening oesophagus through a thoracotomy Proximal end floppy funnel (24mm OD), distal end can be trimmed Heated plastic moulded to funnel shape Proximal end fishmouthed 3-0x2-5 cm, distal end also fishmouthed Format of a hollow screw that is actually screwed into place, proximal end two notches Held in place by proximal lip, rough exterior and spiral body Proximal end funnelshaped and distal end reversed funnel Transparent plastic with two radio opaque rings, can be pushed in place over flexible fibrescope proximal end diameter 25 mm. One type has a spiral ring barrel. Flanged proximal end with bevelled distal end - 65 Malignant oesophageal strictures DISTAL ENDS PROXIMAL ENDS collar funnel cup tulip Fig. 2. Proximal ends of tubes. the rim will form angles at both sides which may perforate the oesophageal wall. For this reason Procter (36) developed the fish-mouthed end to avoid this (see Fig. 1). When a tube is made of polyethylene or polyvinyl chloride the end. can be heated and formed as a funnel, or indeed any shape which is then maintained at body temperature (55,56). A floppy proximal end such as the Celestin tube can be compressed to a smaller size during insertion. The cricopharyngeal sphincter limits the size of the proximal end. Although it presents as a transverse slit, it can be dilated up to 75 FG, but it will not usually take instruments of one inch diameter (23-9 mm diameter is equivalent to 75 FG). One inch diameter is equivalent to 24-5 mm or 78 FG, if the conversion uses n as 3-142 rather than 3-0. At smaller diameters this difference for the value of re does not matter for all practical purposes, but it is essential for a surgeon to know whether his tubes and dilators are measured accurately and with what conversion factor. In the past much trouble occurred because dilatation was measured in inches and their fractions but tubes were inserted in metric sizes or vice versa. Too large a proximal end is cumbersome during insertion and may cause pressure necrosis in situ. It must be remembered that the oesophagus is normally collapsed with a negative intraluminal pressure. These problems are exacerbated with intubation of the cervical oesophagus. Here, there is very little space between vertebrae and the trachea and it is essential also for the length of the proximal end to be so short that it does not impinge on the cricopharyngeal sphincter. Tubes of a smaller Table II: MATERIALS Material Boxwood and ivory German silver, an alloy of brass and nickel Ivory Latex rubber Ncoplcx Nylon Polyethylene PE 410 Polyvinyl chloride (PVC) Portex Resinyl Silicon rubber Solid silver Stainless steel Tygon R8420 3693 Author Symonds (17,18) Souttar (25-27) Etoilles(19) Celestin (32) Procter-Livingstone (36,95) Mousseau (29) Sachs (66) Carter (56) Clauss (103) Coyas (81) Dubois(104) Fell (85) Greening (105) Grewe (106) Heimlich (50) Holinger (59) Mackler (90) O'Connor (34) Weisel (101) Zaslavsky (107) Hayes (108) Stirnemann (100) Kropff(109) Atkinson (40) Brown (110) Amman and Collis (28) Farlam (7) Palmer (53) Jager(65) Tytgat (54) flush bevel fishmouth flap valve Fig. 3. Distal ends of tubes. size with a narrow collar are to be preferred in this anatomical situation. Distal end: Most tubes have the distal end cut off at right angles to the long axis (Fig. 3). Some have suggested an oblique end to enlarge the lumen at the exit. Another advantage proposed for this is that compression of the end will not occur. The former idea ignores the fact that the internal diameter of the barrel will limit the flow and the latter the fact that the barrel should be non-compressible anyway. Proximal dislodgement is a problem with some tubes. Distal collars have been provided as with the original Guisez tube (see Fig. 1) (22) and others have an additional flange or end (57) some of which can be screwed on through the laparotomy incision (50, 58). A de Pezzer or mushroom-shaped end has also been used (22, 59,60). Three designs presently available, by Celestin, Atkinson and Procter, have a distal flange or collar to prevent proximal movement. Reflux back through the tube can be a problem if it traverses the gastro-oesophageal junction. Flap valves (61), similar to those provided in the Aldon bag (62), can prevent reflux (Fig. 3). Most surgeons will deal with this particular problem by advice to go to bed with an empty stomach and to sleep propped up, similar to that given patients after an oesophagogastrectomy. Oesophagitis, due to gastric reflux proximal to the tube, does occur, is infrequent and rarely causes complications. Barrel: The majority are smooth. None is made of Teflon which has the lowest possible surface tension, but on the contrary many rely on a rough external surface for fixation such as the Souttar tube, which is a spiral screw with 10 turns per cm, pushed in rather than screwed in. The Souttar tube has been modified by coating it with plastic to prevent tumour infiltration (63), but this modification eliminates the roughness which prevents the normal Souttar tube moving. The tube designed by Coyas (64) has multiple rings to prevent dislodgement, as does one described by Tytgat (54, 65). Two designs have a spiral superimposed upon the barrel, which is made of plastic (65,66). The only tube with a deliberate continuous spiral specifically made for screwing into place is the one Sachs described (see Fig. 1) (66). Complications (36, 67) Bolus obstruction This is often cited as the main contraindication to intubation but it is rare. Some patients can swallow normal food without observers being aware that they have a tube in situ. The patient should aim to take the same diet as is cooked for other members of the household. Specifically, steaks and fresh bread may cause trouble and should be avoided. Minced meat and toast are less likely to stick. All patients should have their teeth properly looked after so that they can chew well. Bolus obstruction in the majority of instances will relieve itself by autodigestion and softening but if there is still total blockage after 12-24 hours the patient should go to hospital. Meat tenderizer or fresh pineapple juice have been suggested as methods for the patient to clear the block himself. All the authors' patients are given a letter describing the size and site of the tube inserted in case they attend a strange hospital or their notes cannot be found on admission. The first procedure is to pass a large nasogastric tube to try and push the bolus through. If this fails, endoscopy is necessary. It is doubtful whether a preliminary Gastrografin radiological examination is helpful. 66 Perforation The most dangerous complication is perforation. This may be caused by making a false passage through the tumour or below, early during the process of dilatation, later as the palliative tube is inserted or delayed due to pressure necrosis. The use of guide wires can help to reduce the incidence of making a hole through the oesophageal wall and careful attention to- the size of the lumen in relation to the outside diameter of the tube reduces the risk of splitting the muscle. Most tubes arc inserted over a guide rod as described with the original Souttar tube (25). The modern ones can be guided over a flexible fibrescope. If a Souttar tube is passed blindly it is helpful to block the open distal end with a soluble device, either a glycerine suppository acting like an obturator, as first described by Souttar, or a moulded toffee. Tumours at the gastro-oesophageal junction are more difficult to intubate because of the change in axis. Previously the pullthrough technique was used exclusively but it is possible to push either a Celestin (38), a Souttar (68) or a Tytgat tube (65) from above provided that there is a guide wire or a bougie in place. Pulling a tube through a tumour via a gastrostomy does not completely avoid perforation or a false passage. It may help to have a nasogastric tube, guide wire or thread (69) in situ first. Hegar's dilators are usually the most suitable for retrograde dilatation. Another technique of use with a gastrostomy is gradual dilatation from above downwards using the 'endless-string' technique and passing increasing sized bougies through the narrowing (70). The earliest signs of perforation are pain, rising pulse rate and temperature, but exploration is not necessarily essential as 'small leaks can be treated conservatively. The procedure should be covered with preoperative antibiotics. Local pressure may lead to perforation as a delayed phenomenon (71). Tracheal compression may be caused by a tube with a very large lip (72) but perforations caused apparently by pressure may be part of the natural process of the disease and not due to the inert material penetrating through local structures. Fistulas due to necrosis may enter the trachea, bronchi or the lungs (73), aorta, other mediastinal vessels or the pericardium. If fluid enters the lung through a fistula, a palliative tube can be inserted to block off the hole and provide a preferentially large lumen for the bolus passing down the oesophagus. Coughing immediately after swallowing, worse with liquids than solids, should be interpreted as a tracheo-oesophageal fistula and treated as an emergency by intubation. If acute haemorrhage occurs due to erosion of a large vessel it is doubtful whether anything can or should be done. When air is seen in the pericardium, intubation is not helpful but it can persist for weeks before death. Proximal displacement Proximal displacement can occur with any palliative tube as a result of too loose a tube being inserted or it not being jammed tightly enough against the upper edge of the tumour. It is a simple matter to re-insert a correct size of tube. Early diagnosis of this complication can be made by a comparison of the postoperative X-ray with a preoperative film. It is essential to have films of the tumour in relation to the whole chest or upper abdomen. These are obtained by radiotherapists so that the size and position of the growth can be measured for subsequent irradiation. They are also essential before inserting a tube so that its appropriate length can be assessed, any curves or axis deviation can be recognized and the correct position be easily seen on a straight film after insertion. If this latter film is correct and the patient is swallowing normally there would appear to be no advantage in postoperative barium or Gastrografin swallows. Different designs have been developed to prevent tubes moving upwards, which are either in the form of a de Pezzer catheter, a collar or a flange (Fig. 4). The tubes are designed to prevent proximal dislodgement; consequently, if they are pushed too far originally or slip down, it is almost impossible to withdraw them through the mouth and they have to be removed through a gastrostomy. It is suggested that this is an unnecessary complication which can easily be avoided by not using this type of design. If a tube dislodges proximally it can R. Earlam and J. R. Cunha-Melo PREVENTION OF PROXIMAL DISPLACEMENT \ collar de Pezzer flange Fig. 4. Prevention of proximal displacement. easily be pushed back or changed. The complications of the distal collar or flange far outweigh the risk of either having to push the tube back down again or change it. Distal displacement Distal displacement with the tube passing into the stomach can occur with any of the tubes and it is more likely to occur in those with a relatively small proximal lip. Careful attention to the accurate measurement of diameters is the most essential factor in prevention. The new stainless steel Souttar tubes have a wider rim than the older type and are less likely to pass into the stomach. Short small tubes have been known to pass throughout the bowel but some may remain for ever in the stomach causing no symptoms. The Souttar, Procter Livingstone, Celestin and Mousseau-Barbin types have been known to pass per rectum. If a tube passes into the stomach at least adequate dilatation of the stricture has occurred. Reflux Reflux occurs when a tube is inserted in the lower one-third of the oesophagus bridging the gastro-oesophageal junction. Macroscopic oesophagitis is usually unaccompanied by symptoms whether due to reflux or stasis above an obstruction and should not necessarily be treated per se. Heartburn or reflux up through the cricopharyngeal sphincter should be treated symptomatically by antacids, posture and the avoidance of large meals before going to bed. Wound infection Wound infection occurs in almost half the patients when a thoracotomy or a laparotomy is necessary to insert a tube directly or to pull one down through a gastrostomy. It is probably always wise to drain the laparotomy incision. The reasons lie in the poor general condition of the patient, the absence of high acidity in the stomach to sterilize its contents and the unavoidable contamination of pulling the tube through the mouth and oesophagus. Wound infection must be accepted as one of the complications to be assessed when deciding whether to push or pull a tube through an oesophageal obstruction. Guide wire complications These can occur during the course of dilatation. A guide wire provides safety for the inexperienced but there are a few specific complications which should be avoided. The wire must be carefully looked after since once it has been kinked it is damaged for ever and should be replaced. The guide wire springs are delicate and can break if pushed too hard (73). Loops and knots can also cause obstruction and this can be avoided by not passing too much wire into the stomach. Complications related to tube material Specific complications of the Celestin tube include rubber destruction or decomposition (74). This can be avoided by replacement of the tubes at 6-monthly intervals but there is no advantage in regular endoscopic inspection even if Celestin tubes are used for benign strictures (75) because this complication is rare. In the latest tubes the nylon spiral is in short lengths. Originally the nylon spiral was continuous and when the latex decomposed the distal part attached by the nylon passed down the bowel and perforation was caused by the bowstring sawing effect (76). Any tube with the old- Malignant oesophageal strictures fashioned design should be discarded because the rubber does not have an indefinite shelf life. The other types of tube have not been in use long enough for specific complications to be described or were discarded early because too many complications occurred. Polyethylene does not have an indefinite life in the body and becomes brittle and fractures with time. Each material has its own specific complications but they can be avoided by replacement. If this is done together with further dilatation, a larger tube can be pushed in. If the tube was originally one of the pullthrough type, further laparotomy is unjustified. The problems of material decomposition in the majority of instances are of no practical importance because the natural history of the disease at this stage is so short. Others Proximal prolapse of the rim has been described (77) but the tulip shape was designed to avoid this. Prolapse of the oesophageal mucosa has been described once, but only with a Mousseau-Barbin tube (78). Assessment of results . Very few papers have been concerned with measurement of the quality of life after intubation, in spite of this being the main factor in palliation (79). Apart from the ability to swallow, it is essential to assess such items as sleeping at night without coughing or choking (80). The ability to enjoy leisure and be able to work are rarely measured but are actually extremely important. The ideal palliative tube Sir Henry Souttar originally proposed that an ideal tube should be (27): flexible, incompressible, non-traumatic and compact, should have an adequate lumen and remain in place. Nothing more can be said except perhaps to add the questions: what is the name of this ideal tube and from where can it be obtained? The authors consider that the basic tube types, Celestin (with or without flange, Medoc (Glos.) Ltd, Tetbury, Gloucestershire) or Atkinson (with flange, Ke'ymed, Southend-on-Sea) and Souttar (stainless steel, Seward's, Blackfriars, London), are-as near to ideal as can be obtained. They are available in different sizes, and can be pushed or pulled according to the particular tumour. The Didcott dilator and the Procter-Livingstone tubes can also be obtained in this country (Staniforth Limited, Penarth, South Glamorgan). It is essential that tubes are stocked in every operating theatre because suitable patients are admitted frequently as emergencies. Acknowledgement Dr Cunha-Melo would like to thank the Brazilian National Council of Scientific and Technological Development (CNPq) for a grant. References 1. Earlam R. J. and Cunha-Melo J. R.: Oesophageal squamous cell carcinoma: I. A critical review of surgery. Br. J. Sure. 1980; 67: 381-90. 2. Saunders N.- R.: The Celestin tube in the palliation of carcinoma . of the oesophagus and cardia. Br. J. Surg. 1979; 66: 419-21. 3. Angorn I. B. and Hegarty M. M.: Palliative pulsion intubation in oesophageal carcinoma. Ann. R. Coll. Surf. Engl. 1979; 61212-4. 4. Sanfelippo P. M. and Bernatz P. E.: Celestin-tubc palliation for malignant esophageal obstruction. Surg. Clin. North Am. 1973; 53: 921-6. 5. Jackson J. W., Cooper D. 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