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• W3204347599 abstract "We read with interest the recent article by Lebastard M et al. Evaluation of bronchial narrowing in coughing dogs with heart murmurs using computed tomography.1 For decades, veterinarians have noted that radiographs of older, small breed dogs with cough and with a severely enlarged left atrium because of severe mitral regurgitation appear to show compression of the left caudal (”left mainstem”) bronchus by the left atrium. However, such dogs are also prone to bronchomalacia and therefore the question has long been whether the cough is caused by to the severely enlarged left atrium compressing a normal bronchus, the cough is caused by airway disease such as bronchomalacia (with the large left atrium merely highlighting the bronchial narrowing), or the large left atrium is compressing an already diseased left caudal bronchus and thus exacerbates the airway problem and the cough. One study has found that coughing, older, small breed dogs with large left atria have bronchomalacia and airway inflammation similar to that of coughing dogs lacking cardiomegaly.2 Consequently, the only questions that remain are: (a) whether or not a severely enlarged left atrium can compress a normal left caudal bronchus; (b) whether or not a severely enlarged left atrium can compress a collapsed left caudal bronchus further; and (c) whether either of these can cause or exacerbate coughing. The study that is the subject of this letter1 used computed tomography (CT) to provide further evidence that in older, small breed, coughing dogs with severely enlarged left atria, the bronchi are collapsed. In other words, it uses new technology to tell us what we already know (ie, that there may be an association between cardiomegaly and bronchial narrowing in older, small breed dogs). Unfortunately, this finding provides no new insight into the problem. We have additional concerns about other aspects of this study. For a control group, the authors chose dogs without known cardiovascular disease that underwent thoracic CT during an unknown time period. Little information is provided on these dogs, and it is unclear if they were matched for age, breed, body condition score, and other factors. Including at least 2 other control groups would have been preferable: a group of dogs with cardiomegaly without cough, as was recommended in the discussion of a previous article on this topic,2 and a group of coughing dogs without enlarged left atria or cardiomegaly. The authors state that no significant association was found between CT findings of a bronchial pattern and the bronchial-to-aortic ratio; however, this does not rule out an effect of bronchial inflammation on cough. As stated above, the classic debate is whether cough in an older, small breed dog with severe left atrial enlargement caused by mitral regurgitation is a result of the enlarged left atrium compressing a normal or a malacic left caudal bronchus, caused by bronchomalacia alone, a consequence of inflammatory airway disease, or a combination of disorders.2, 6, 7 Similar to the previous study,2 the present study1 found that numerous bronchi were collapsed. No one, however, has previously suggested that cough in these dogs is a result of compression of bronchi other than the left caudal bronchus. It is difficult to understand anatomically how a large left atrium could compress bronchi other than the left caudal bronchus, especially those on the right side, which are also commonly collapsed.1, 2, 8 Consequently, it seems more logical that the present study provides further evidence that many coughing dogs have widespread bronchomalacia.8 The authors suggested bronchial stenting as possible treatment for dogs with cardiomegaly and bronchial narrowing, referencing a single case report on this procedure. We believe this suggestion is ill-advised given the controversy surrounding this topic and the fact that engineering of bronchial stents still is in the developmental stage. We appreciate the opportunity to express our concerns regarding this study. We look forward to future studies of this topic that will enhance our understanding of the interaction between cardiac and respiratory diseases." @default.
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• W3204347599 date "2021-09-29" @default.
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• W3204347599 title "Letter regarding “Evaluation of bronchial narrowing in coughing dogs with heart murmurs using computed tomography”" @default.
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• W3204347599 doi "https://doi.org/10.1111/jvim.16266" @default.
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