Timsit Edouard, Tison Nicolas, Booker Calvin W, Buczinski Sébastien
Department of Production Animal Health, Simpson Ranch Chair in Cattle Health and Wellness, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.
Feedlot Health Management Services, Okotoks, Alberta, Canada.
J Vet Intern Med. 2019 May;33(3):1540-1546. doi: 10.1111/jvim.15483. Epub 2019 Mar 22.
Severity of lung lesions quantified by thoracic ultrasonography (TUS) at time of bronchopneumonia (BP) diagnosis predicted death among steers not treated for this condition. Further research is needed to confirm that lung lesions detected by TUS can be associated with negative outcomes in cattle with BP that subsequently were treated.
To quantify the effects on relapse rate and average daily gain (ADG) of lung lesions detected by TUS at first BP diagnosis in feedlot cattle.
Prospective cohort of mixed beef-breed steers (n = 93; 243 ± 36 kg) and heifers (n = 51; 227 ± 42 kg) with BP at 4 feedlots.
Thoracic ultrasonography was performed by the same clinician and 16-second TUS videos were evaluated offline for maximal depth and area of lung consolidation, maximum number of comet tails, and maximal depth of pleural fluid. Individual ADG was calculated between 1 and 120 days after arrival. Effects of lesions on relapse rate and ADG were investigated using mixed regression models.
Maximal depth of lung consolidation was associated with a higher risk of relapse (odds ratio [OR], 1.337/cm; 95% confidence interval [CI], 1.042-1.714) and lower ADG (- 34 g/cm; -64 to -4). Maximal area of lung consolidation also was associated with a higher relapse risk (OR, 1.052/cm ; 1.009-1.097) but not with ADG. Comet tails and pleural fluid were not associated with risk of relapse or ADG.
Quantifying maximal depth and area of lung consolidation by TUS at first BP diagnosis can provide useful prognostic information in feedlot cattle.
在支气管肺炎（BP）诊断时通过胸部超声检查（TUS）量化的肺部病变严重程度可预测未针对该病症进行治疗的阉牛的死亡情况。需要进一步研究以证实TUS检测到的肺部病变与随后接受治疗的BP牛的不良结局相关。
量化育肥牛初次BP诊断时TUS检测到的肺部病变对复发率和平均日增重（ADG）的影响。
来自4个饲养场的患有BP的混合肉牛品种阉牛（n = 93；243±36 kg）和小母牛（n = 51；227±42 kg）的前瞻性队列。
由同一位临床医生进行胸部超声检查，并离线评估16秒的TUS视频，以确定肺实变的最大深度和面积、彗尾的最大数量以及胸腔积液的最大深度。在到达后的1至120天内计算个体ADG。使用混合回归模型研究病变对复发率和ADG的影响。
肺实变的最大深度与较高的复发风险相关（优势比[OR]，1.337/cm；95%置信区间[CI]，1.042 - 1.714）和较低的ADG（-34 g/cm；-64至-4）。肺实变的最大面积也与较高的复发风险相关（OR，1.052/cm²；1.009 - 1.097），但与ADG无关。彗尾和胸腔积液与复发风险或ADG无关。
在初次BP诊断时通过TUS量化肺实变的最大深度和面积可为育肥牛提供有用的预后信息。
