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How Can Upper Gastrointestinal Endoscopy Help Me Make a Diagnosis in Dogs and Cats? Part 1

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How Can Upper Gastrointestinal Endoscopy Help Me Make a Diagnosis in Dogs and Cats? Part 1 26 SURGERY VP SEPTEMBER 2017 How can upper gastrointestinal endoscopy help me make a diagnosis in dogs and cats? Part 1 DISEASE OF THE UPPER of all dogs and cats using a gastroscope Rugal folds can be used to guide GASTROINTESTINAL TRACT with an insertion tube diameter of you through the stomach as they run is common in small animal practice up to 10mm. The critical factor is the length of the stomach and not and flexible endoscopy can provide the ability to pass the gastroscope transversely. So, if you want to reach a powerful diagnostic tool in the through the pylorus and intubate the the pylorus, in general follow the rugal investigation of such cases. duodenum. folds. The problem facing the clinician is Most endoscopists will freely admit The angular incisure marks the the range in size of patients which may that this is the most difficult procedure entrance to the antral canal, appearing require endoscopic investigation; from to carry out, even with the best as a sharp fold on the lesser curvature. small cats and dogs to giant breeds equipment available. The procedure It is also where carcinoma of the such as the Great Dane. This variation can, though, be made much more canine stomach is most often detected. in size creates difficult if a To ensure that the important real challenges large diameter landmarks you are looking for are JAMES W. SIMPSON Figure 2. Normal anatomy of the in being able insertion tube always in the same place as you enter feline and canine stomach. to physically provides some tips on is used. the stomach, always place the patient in carry out an what to buy and how to Ideally you left lateral recumbency. The appearance Advance the gastroscope through the endoscopic use it, detailing the most should use a of the stomach looks entirely different sphincter by “feel” as the image will examination. effective way to take gastroscope in right lateral recumbency. disappear when the lens comes into Therefore, biopsy samples and what with the Prior starvation of the patient is contact with the mucosa. when to watch out for when ‘going in’ smallest essential. Endoscopic examination The sphincter is not particularly considering outside carried out with food or fluid within difficult to overcome and once you purchase of a flexible endoscope it insertion tube diameter available. the stomach is impossible to complete “feel” the endoscope pass into the is important to take time to consider Veterinary gastroscopes are now made successfully. Endoscope lenses refract stomach, stop further advancement the animals you are most likely to be with insertion tubes of around 7mm. light when they come into contact with and inflate the stomach with enough investigating and choose endoscopic Increasing the insertion tube diameter fluid or food, creating what is called air to visualise the fundal rugal folds. equipment appropriate to your practice by only 2mm to 9mm can make the a red-out (or image loss). So starve Examine the stomach systematically, needs. difference between success and failure patients for at least 12 hours prior to ensuring that the entire mucosal The specifications for a veterinary in intubating the duodenum, especially the procedure to ensure the stomach is surface has been examined. Do not gastroscope are shown in Figure 1. in small dogs and cats. empty. forget to retroflex the endoscope However, there are several important The size of the biopsy channel can The gastrointestinal tract is normally tip to examine the cardia, which is a factors to consider before making your vary, but the minimum requirement a collapsed tube, so in order to view blind spot when entering the stomach purchase. should be a channel of at least 2mm the mucosa it is necessary to inflate (Figure 3). Pass the endoscope around In small dogs and cats, a standard diameter. Some veterinary endoscopes the lumen with air. The air facility the angular incisure and into the antral one-metre insertion tube will be have biopsy channels of 2.8 to 3mm in on the gastroscope is available to do canal. Prior lubrication of the insertion adequate for carrying out a thorough diameter. this in a controlled manner. Only tube will aid this process and reduce examination of the stomach and Why does this matter? The larger inflate the lumen with enough air to resistance to forward movement. duodenum. However, in large dogs the the biopsy sample you can collect, the allow clear vision; take great care not The gastric mucosa should have fundus of the stomach is much larger. more diagnostic the sample is likely to to over-inflate the lumen, especially a uniform pink colour throughout. Therefore, a one-metre gastroscope be. Very small biopsy samples can be in the stomach where this can cause Biopsy samples should be collected is simply too short to examine the difficult to block and section and may compression of vena cava and from any lesions observed or from stomach and duodenum. It is for this result in samples which are difficult to compromise breathing. round the edge, not the centre, of reason that veterinary gastroscopes are interpret. It also creates a large cavity where ulcers. Where no lesions are visualised, now manufactured with an insertion Ideally use the largest forceps the all the landmarks in the stomach are collect multiple biopsy samples from tube length of at least 1.4 metres. biopsy channel will accept and use lost and intubation of the duodenum different areas of the stomach. The second important factor forceps with small holes in the side becomes impossible as the pylorus The pylorus may be open or closed to consider is the diameter of the cups – called “fenestrated” forceps – as becomes tightly-closed. in the normal patient. In some cases, insertion tube. It is quite possible to they allow samples to bulge through Start your endoscopy by passing the bile may be seen refluxing into the examine the oesophagus and stomach the small holes and reduce crush endoscope along the hard palate, into stomach; this is normal. The pyloric damage. the pharynx and then through the weak sphincter is powerful and once closed, Insertion tube length: +/-1.4 cricopharyngeal sphincter. it can be very difficult to pass the metres Once in the oesophagus, gently gastroscope into the duodenum. Carrying out your endoscopy Insertion tube diameter: 7 to 8mm To carry out an upper gastrointestinal inflate the lumen so a clear image of It is well-recognised as the hardest Forward viewing tip endoscopy, it is very important to the mucosa can be seen. Advance endoscopic procedure to carry out, Four-way tip movement know the normal anatomy – especially the endoscope slowly, examining the even by experienced endoscopists. Retroflex capability of the stomach. The stomach can be mucosa as you proceed, thus ensuring Biopsy channel minimum 2mm very large and it is easy to get “lost” any lesions observed are “real” and not Air/wash facility when carrying out an examination artefacts created by the gastroscope. Suction facility unless endoscopic landmarks are The oesophagus is not a straight Figure 1. Basic specifications for a recognised ( ). tube but bends as it passes through small animal gastroscope. Figure 2 the thorax. Adjust the tip of the James W. Simpson, SDA, BVM&S, MPhil, FHEA, MRCVS, RCVS gastroscope to allow for a good image. Specialist in Internal Medicine, qualified from Edinburgh University There should be no food or fluid in 1977 and spent three years in general practice before returning to accumulating in the oesophagus. It successfully study for a Phil degree. He became lecturer, senior lecturer is normally not possible to routinely and ultimately professor of canine medicine at the Royal (Dick) School biopsy the oesophagus, as the mucosa of Veterinary Studies, where he was head of small animal medicine. is very tough and difficult to sample. In 2011 he took early retirement and started his own referral service. The cardia (lower oesophageal He lectures both nationally and internationally and is medicine co- sphincter) marks the entrance to Figure 3. Retroflexed view showing ordinator for the BSAVA Certificate programme. the stomach and is normally closed. the cardia of the stomach..
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