Food Animal Internal Medicine

Research Abstract

F12 - Accuracy of Systematic Thoracic Ultrasound for Diagnosis of Active Pneumonia in Pre-Weaned Calves

Friday, June 15
2:15 PM - 2:30 PM
Location: WSCC 310

Among the different presentations of bovine respiratory disease, active pneumonia (ActP) (defined as an infection of the lower airway with signs of inflammation) is the most important to diagnose to institute appropriate treatments. Thoracic ultrasonography (TUS) seems promising but data are scant regarding its accuracy for diagnosis of ActP. The objective of this study was to estimate the accuracy of TUS (positive if maximal depth of consolidation (DEPTH) ≥3cm) compared to reference tests (Wisconsin Clinical Respiratory Scoring Chart (CRSC, positive if ≥5) and serum haptoglobin concentration (Hap, positive if ≥15mg/dL)), for the diagnosis of ActP in pre-weaned calves, using a latent-class model methodology (LCM). One population of veal calves (n=209) and one of dairy calves (n=301) were enrolled. TUS, CRSC and Hap (imperfect tests) were performed at the same day, in each calf. Bilateral TUS was performed by screening the mid to ventral portion of the lung caudal of the heart (caudal sites) as well as the right parenchyma cranial to the heart (cranial site). The DEPTH on TUS was recorded and noted separately for caudal and cranial sites. The accuracy of TUS was estimated by LCM for three tests conducted in two populations. The ActP prevalence in both populations was low (0.05). Adding the cranial site had little effect on TUS accuracy. Using DEPTH ≥3cm for caudal sites only, posterior sensitivity and specificity median estimates of 0.88(95%BCI: 0.52-1.0) and 0.95(95%BCI: 0.92-0.98), respectively, were observed. In conclusion, we suggest using a DEPTH ≥3cm caudal to the heart to detect ActP.

Julie Berman, DMV, ACVIM Diplomate

phD student
Université de Montréal - Faculté de Médecine Vétérinaire

- Dr Vet at veterinary school at Lyon (France), in 2013
- Internaship in bovine medicine and surgery, from 2013 to 2014 at the faculty of veterinary medicine, university of Montréal.
- Residency in large animal internal medicine at the faculty of veterinary medicine, university of Montréal from 2013 to 2017
- ACVIM (LA) Diplomate in 2017
- Curently phD student about the improvment of diagnostic methods to detect bovine respiratory disease in pre-weaned dairy calves

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