BACKGROUND Dogs with tracheal stents often have positive airway bacterial cultures. The pathogenicity of these organisms and risk factors for infection have not been investigated. OBJECTIVE Describe bacterial infection in dogs with tracheal collapse before and after tracheal stent placement. ANIMALS Fifty-three client-owned dogs. METHODS Retrospective review of medical records of dogs receiving tracheal stents with thoracic radiographs, tracheoscopy, and endotracheal lavage. RESULTS There was no difference between the overall prevalence of dogs with positive bacterial cultures before (31/38; 82%) or after stent placement (24/31; 77%) (P = .67). An increased number of geriatric (17/28; 61%) and traditional-type collapse (TTC) (16/26; 62%) dogs had positive pathogenic airway infections before stent placement, compared to young (8/25; 32%; P = .04) and malformation-type collapse (MTC) dogs (9/27; 33%; P = .04). After tracheal stent placement, geriatric dogs had a 52% reduction in pathogenic bacteria infection frequency (P = .02) and dogs with TTC had a 56% reduction in pathogenic bacteria infection frequency (P = .01). Significant risk factors for pathogenic infection included a history of pneumonia (OR = 3.6; 95% CI, 0.28-43.36) and cardiac disease (OR = 1.25; 95% CI, 0.16-9.92) in geriatric dogs, and hepatomegaly in young dogs (OR = 1.5; 95% CI, 0.12-19.44). CONCLUSIONS AND CLINICAL IMPORTANCE Tracheal stent placement does not increase the overall rate of pathogenic bacterial infection in dogs with tracheal collapse and can decrease the rate of subsequent pathogenic infections in geriatric dogs and dogs with TTC that require tracheal stenting. Airway culture and cytology should be performed in all dogs undergoing tracheal stent placement.

中文翻译：

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犬气管塌陷综合征放置支架前后的细菌感染。

背景技术具有气管支架的狗通常具有阳性的气道细菌培养物。这些生物的致病性和感染的危险因素尚未研究。目的描述气管支架置入前后气管塌陷的犬的细菌感染情况。动物53只客户拥有的狗。方法回顾性评估接受气管支架的狗的医疗记录，包括胸片，气管镜检查和气管内灌洗。结果细菌培养阳性的狗的总患病率在放置支架之前（31/38； 82％）或放置支架后（24/31; 77％）之间没有差异（P = .67）。与年轻的（8/25; 32％;）相比，在放置支架之前，老年狗（17/28; 61％）和传统型塌陷（TTC）（16/26; 62％）的犬的病原体气道感染呈阳性。 P =。04）和畸形型塌陷（MTC）狗（9/27; 33％; P = .04）。放置气管支架后，老年犬的病原菌感染频率降低了52％（P = .02），患有TTC的犬的病原菌感染频率降低了56％（P = .01）。致病性感染的重要危险因素包括老年狗的肺炎史（OR = 3.6; 95％CI，0.28-43.36）和心脏病（OR = 1.25; 95％CI，0.16-9.92），以及幼犬的肝肿大（ OR = 1.5； 95％CI，0.12-19.44）。结论和临床意义气管内支架置入不能增加气管塌陷犬的致病细菌感染的总体发生率，并且可以降低老年犬和需要气管支架置入的TTC犬的后续致病菌感染率。