Pericardiotomy by Transdiaphragmatic Thoracoscopy Singleport in Horses.

Thoracoscopy pericardiotomy consists of endoscopic access to the thoracic cavity to perform the opening of the pericardial sac, described in the equine species only through the intercostal access, and there are no studies addressing the singleport transdiaphragmatic access, so the objective was to develop the pericardiotomy technique by transdiaphragmatic thoracoscopy using a single port. The technique was performed using six cadavers of adult horses, positioned in dorsal decubitus, making it possible to initiate access with an incision in the region proximal to the xiphoid process, for the introduction of an 11 mm endotip trocar, which through the diaphragm reached the thoracic cavity. After accessing the thorax, a rigid endoscope with a working portal was entered, proceeding with the introduction of endoscopic scissors, used to open the pericardium. Pericardiotomy was initiated through the phrenic-pericardial ligament. After the procedure, the corpses were sent for necropsy for evaluation of inadvertent injuries and examination of the diaphragm and pericardium. The access allowed the visualization of the structures of the caudal portion of the thorax, in addition to the visualization and manipulation of the pericardium. The mean surgical time was 24.16 ± 7.03, allowing extensive pericardiotomy. It was concluded that transdiaphragmatic thoracoscopy is an adequate procedure for the visualization and access of the pericardium, as well as the structures present in the caudal region of both hemithoraxes. Therefore, the proposed technique, pericardiotomy by thoracoscopy using a singleport transdiaphragmatic approach, was promising, proving to be a viable alternative for pericardial procedures in the equine species.

An Assessment of Secondary Clinical Disease, Milk Production and Quality, and the Impact on Reproduction in Holstein Heifers and Cows from a Single Large Commercial Herd Persistently Infected with Bovine Viral Diarrhea Virus Type 2.

The aim of this study was to evaluate secondary clinical disease, milk production efficiency and reproductive performance of heifers and cows persistently infected (PI) with bovine viral diarrhea virus type 2 (BVDV type 2). PI animals (n = 25) were identified using an antigen capture ELISA of ear notch samples. They were distributed into three age groups: ≤ 12 (n = 8), 13 to 24 (n = 6) and 25 to 34 (n = 11) months old. A control group of BVDV antigen ELISA negative female cattle that were age matched to the PI animals was utilized from the same herd. The PI group had a 1.29 higher odds ratio for diarrhea than controls (p = 0.001, IC95% = 1.032-1.623) and 1.615 greater chance of developing bovine respiratory disease (BRD) (p = 0.012, IC95% = 1.155-2.259). The age at first insemination (p = 0.012) and number of insemination attempts required to establish the first pregnancy (p = 0.016) were both higher for PI than controls. Milk production was higher for control cows than PI cows during most of the sampling periods. Somatic cell counts (SCC) were higher in PI cows than the controls at all sampling points across lactation (p ≤ 0.042). PI cattle had a higher incidence of disease, produced less milk, a higher SCC, and poorer reproductive performance than control cattle in this study.