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Randlabautumn 2019 NEWSLETTER AUTUMN 2019 NEWSLETTER Your Partner in Practice

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Randlabautumn 2019 NEWSLETTER AUTUMN 2019 NEWSLETTER Your Partner in Practice RANDLABAUTUMN 2019 NEWSLETTER AUTUMN 2019 NEWSLETTER Your Partner in Practice. New Insights Into the Management of Equine Gastric Glandular Disease Edited by Dr Michael Robinson Equine Glandular Gastric to exogenous ACTH indicating that they may be more sensitive to Disease (EGGD) is a distinct stress. Stress may also influence gastrin production and blood supply to the glandular mucosa and may be a factor in both initiation and disease entity to Equine perpetuation of glandular lesions. Squamous Gastric Disease Warmblood showjumpers at international level are less likely to (ESGD) with differences in have EGGD than lower level jumpers, probably because they are prevalence, risk factors, better adapted to the competition environment and consequently pathophysiology and response adapted to physiological stress as evidenced by lower circulating cortisol concentrations. Same applies to experienced polo ponies. to treatment. Although the Alternatively, this may reflect selection of those more ‘experienced’ treatment of ESGD remains animals or selection for animals that do not succumb to EGGD as they relatively straightforward (think rise through the ranks. Omeprazole and appropriate management practices), Stress minimisation may play a pivotal role in reducing EGGD. treatment of EGGD is more problematical. Three recent Prevalence publications have given a Unlike ESGD, the prevalence of EGGD does not increase with clearer understanding of the aetiology, management increased exercise intensity/duration and is approximately 55% across and treatment of this common problem1,2,3. all disciplines. A composite graph of the relative prevalence of EGGD vs ESGD across equestrian disciplines is shown in Figure 1. ' Aetilogy <>>$ "&'3$ F>$ EGGD may occur anywhere in the glandular mucosa but is predominantly "''3$ focussed around the pylorus and pyloric antrum. Although true E>$ ulceration may occur, it is usually superficial and rarely deep enough D>$ to involve the lamina propria. Glandular lesions are more typically C>$ inflammatory in nature and more accurately described as a glandular $ JKL B>$ gastritis. When pyloric lesions are evident on gastroscopy, inflammation $ is usually histologically demonstratable throughout the entire glandular A>$ mucosa and not just restricted to the macroscopic lesions. 5;:G;HI @>$ None of the experimental models for replicating ESGD produce ?>$ EGGD. It is most likely that compromised mucosal barrier function is <>$ the primary cause of EGGD and that acid injury may then perpetuate >$ mucosal damage, inhibit epithelial restitution and is integral in causing clinical signs. In humans it is known that acid exposure on an inflamed/ ulcerated mucosa is responsible for clinical symptoms and symptoms may resolve following treatment with proton pump inhibitors (such as omeprazole) prior to resolution of lesions on gastroscopy. ' Figure 1: Composite chart showing the prevalence of EGSD (blue -789:;$<=+,&-.&/$)"+%0(*)+/0&1$23+)0"+.*"4(#"2%"+&5+6789+:'#;"+'(*/<+(2=+6779+:&*(23"+'(*/<+ Helicobacter spp, the most common cause of EGGD in man (who only bars)(%%&*=$23+)&+4(*$&;/+=$/%$.#$2"/> and EGGD (orange+ bars) according to various disciplines. has a glandular stomach) and other species, have not been implicated + in the horse. Bacteria are unlikely to have a primary role in the 12%!%1,2$&%'!&$ development of EGGD although certain species may have the capacity Clinical Signs Q)$%$/*)'-$>%-'49'!((0'*,&'>&%&,*))3',&:4,.&+'.4'C&'.8&'-*6&'*-'94,'!5(0?''' to colonise the damaged mucosa and inhibit healing. Clinical signs of EGGD are generally reported to be the same as for L%'.74',&/&%.'-.#+$&-'.8&'64-.'/4664%)3',&:4,.&+'-$>%'7*-':44,':&,94,6*%/&'1WTU2GM,*/$%>'C&)47' ESGD. E NSAID’s are a rare cause of gastric ulceration in the horse, a fact that &K:&/.*.$4%- ?''A.8&,'/4664%)3',&:4,.&+'-$>%-'7&,&'C&8*;$4#,*)'/8*%>&-'1GGU2<'>$,.8':*$%'1GFU2<' was again confirmed in one of the recent studies1. In two:44,'C4+3'/4%+$.$4%'1X?TU2<':44,'*::&.$.$&'1W?GU2<'*C+46$%*)':*$%'1Y?XU2<'7$.8'WZU recent studies the most commonly reported sign'49'/*-&- was'8*;$%>' poor performance.74'4,'64,&'49'.8&'*C4;&'-$>%-? (65%)3/racing$ below expectations1. Other commonly Stress appears to play an important role in the pathogenessis of reported3%,'!*&%& signs$ were behavioural changes (33%), girth pain (32%), EGGD. Horses with severe EGGD have been shown to exhibit greater poor body(*-.,4-/4:3'$-'.8&'4%)3',&)$*C)&'7*3'49'+$*>%4-$%>'*%+'64%$.4,$%>' condition (9.5%), poor appetitie (6.3%)>*-.$/'#)/&,- and abdominal?''D8&'-#/,4-&'C)44+' pain increases in cortisol in response to novel stimuli and in response (7.9%),.&-. with'*%+'9*&/*)'.&-.-'94,'8*&64>)4C$%'*%+':,4.&$%'*,&'#%,&)*$C)&'*%+'-84#)+'%4.'C&'#-&+' 68% of cases having two or more of the above signs. +$*>%4-.$/*))3?' AUSTRALIAN OWNED AUSTRALIAN@-'.8&'*--4/$*.$4%'C&.7&&%'-&;&,$.3'49' MADE !((0')&-$4%-'4%'>*-.,4-/4:3'*%+'/)$%$/*)'-$>%$9$/*%/&'8*-'%4.' C&&%'&-.*C)$-8&+<'$.'8*-'C&&%'-#>>&-.&+'.8*.'!((0')&-$4%-'-84#)+'C&'+&-/,$C&+'#-$%>'*'/46C$%*.$4%' 49'.8&'94))47$%>'+&-/,$:.4,-[' ' 3"&10%5)*0$ www.randlab.com.au\4/*.$4%' :3)4,#-<':3)4,$/'*%.,#6<'>)*%+#)*,'9#%+#-<'/*,+$*' 7/85 Alfred Road, Chipping Norton NSW 2170 Australia • Phone: (61-2) 9728 3505 • Fax: (61-2) 9728 4352 • Email: [email protected] www.randlab.com.au QUALITYAUSTRALIAN • SERVICEOWNED • VALUEAUSTRALIAN • CARE MADE 1 RANDLAB AUTUMN 2019 NEWSLETTER Diagnosis Management Gastroscopy is the only reliable way of diagnosing and monitoring Provide a minimum of two rest days from work per gastic ulcers. The sucrose blood test and faecal tests for week. haemoglobin and protein are unrelaible and should not be used diagnostically. Turn out where possible, provided horse is not stressed by turn out. As the association between severity of EGGD lesions on gastroscopy Minimise management changes and other potential and clinical significance has not been established, it has been suggested that EGGD lesions should be described using a combination of the stressors. following descriptors: Minimise changes in equine companions and human carers. DESCRIPTOR Minimise the number of human handlers/riders per Location pylorus, pyloric antrum, glandular fundus, cardia horse. Distribution focal, multi-focal, diffuse Feed 2L of chaff or an equivalent volume of forage 30 Severity mild, moderate, severe min prior to exercise. Topography nodular, raised, flat or depressed Appearance erythematous, haemrorrhagic, fibrinosuppurative Treatment Table 1: Suggested descriptions of gastric glandular lesions ESGD is expected to resolve with the treatment of any of the recommended treatment regimens for EGGD. Therefore, wherever ESGD and EGGD exist concurrently, treatment decisions should be Risk Factors based on the effective treatment of EGGD. In a recent study, Sykes et al1 used a comprehensive trainer-completed Although acid injury is not thought to be primary cause of EGGD, a questionnaire looking at management, feeding and exercise practices low pH may perpetuate mucosal damage, cause clinical signs and and compared results to gastroscopy findings. Results were available inhibit mucosal healing. for 109 flat racing Thoroughbreds from eight training yards (3 in UK, 5 in Australia). The main findings are summarised in Table 2. The pH of the gastric fluid in the pyloric region is typically lower Interestingly, in this study, the prevalence of EGGD was only 25%. In (pH=1.0-2.0) than in the rest of the stomach. Therefore, it is likely that previous studies, the prevalence of EGGD in Australian thoroughbreds additional acid suppression therapy would be required to achieve a has been variously reported as between 47% and 65%. more neutral pH necessary for healing. Anecdotally, nodular and fibrinosuppurative lesions are more difficult 95% to treat than flat or erythematous lesions. Some horses appear to ESGD EGGD Confidence have peristent focal erythema in the peri-pyloric region in absence of clinical signs, whilst others will show marked clinical improvement in Intervals response to treatment. Prevalence 72% (64-80%) 25% (16-32%) Response to treatment is the best means of assessing the clinial Exercise ≥ 5 days/ 10.0x 10.4x 1.3-26.9 week relevance of lesions which are of questionable significance. Racing below 3.7x 1.1-16.7 expectations Table 3 shows current recommendations for treatment of EGGD Trainer Yes Oral omeprazole montherapy results in rates of healing of EGGD lesions <32%. Efficacy is increased if it used in combination with Time in work ≤ 6 0.3 (less likely) 0.1-0.99 sucralfate with resolution as high as 63% and improvement in 89% weeks of cases. Aggressive 0.12 (less 0.03-0.54 A recent publication in 40 sports horses3, suggested that misoprostol towards humans likely) (Cytotec), a PG E1 analogue that suppresses acid production and Stereotypies 5.0 1.6-15.9 inhibitis neutrophilic inflammation, may be more effective in both resolving and improving glandular ulcers than omeprazole+sucralfate Presence of other (73% vs 20% for healing and 98% vs 65% for improvement ). However, type of ulcers (1.5-30.0)/ 6.3x 6.6x in this study, treatments were only given for 28-35 days, which is (either EGGD or (2.4-17.0) only about half the currently recommended treatment course for ESGD) omeprazole+sucralfate. No High grain diets Increased risk association The healing and improvement rates for omeprazole+sucralfate In this study, were lower than has previously been reported. Hepburn Nonsteroidal anti- No No reported 80% improvement and 63% healing (grade ≤1) of EGGD inflammatories
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