Pain-related cerebral potentials in response to acute painful electrical stimulation in sheep     

JP MORRIS  RM ONG  JK O'DWYER  JL BARNETT  PH HEMSWORTH  IJ CLARKE  EC JONGMAN 《Australian veterinary journal》1997,75(12):883-886

Objective To examine associations between late event-related cerebral potential amplitudes and behavioural responses to noxious electrical stimulation as an indicator of acute pain in sheep.
Design Analysis of variance for the effects of stimulus intensity on the behaviour and event-related cerebral potential variables.
Procedure Ninety-six brief constant current electrical pulse trains were presented to the front left leg of eight sheep at four intensities (2.5 to 10 mA) in a randomised order. An event-related cerebral potential and a graded flinch response were recorded for each stimulus and the 24 event-related cerebral potentials at each intensity were averaged to produce a mean waveform. Various components of this waveform were analysed and changes in these measures and the sheep's flinch response, as stimulus intensity increased, were determined.
Results Both the flinch response and some event-related cerebral potential components, that is, peak amplitudes 114 {N1}, 187 {P1}, 318 {P2} and 230 {Pm} ms after stimulus onset, were significantly affected as stimulus intensity increased.
Conclusion These corresponding behavioural and event-related cerebral potential changes indicate the usefulness of using changes in the event-related cerebral potential to measure acute pain in sheep.  相似文献   

LESIONS IN SHEEP AND GUINEA PIGS PEN FED PARASITISED ANNUAL RYEGRASS (LOLIUM RIGIDUM)     

P. H. BERRY B.V.Sc.  R. D. COOK B.Sc.  Ph.D.    J. McHOWELL B.V.Sc.  Ph.D.  D.V.Sc.  M.R.C.V.S.  M.R.C.Path  M.A.C.V.S.    R. R. WHITE B.Sc.  Ph.D.  D. A. PURCELL M.V.B.  M.A.  PH.D.  M.R.C.V.S. 《Australian veterinary journal》1976,52(11):540-541

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SENSITIVITY OF RADIOGRAPHIC DETECTION OF LUNG METASTASES IN THE DOG     

JOHANN  LANG  DR MED VET    JEFFREY A. WORTMAN  VMD  PHD    LARRY T. GLICKMAN  VMD  DR PH    DARRYL N. BIERY  DVM    W. HARKER RHODES  VMD M MED SCI 《Veterinary radiology & ultrasound》1986,27(3):74-78

Thoracic radiographs were taken in right lateral recumbent (RLR), left lateral recumbent (LLR), and ventrodorsal (VD) projections in 80 dogs with known or suspected malignant tumors. Radiographs in each projection were interpreted, independently of those in the other two projections, by four veterinary radiologists, and classified as positive or negative for one or more lung metastases. The four radiologists then met, to agree on a diagnosis for each patient by simultaneously reviewing all three views. This panel diagnosis became the standard for subsequently classifying individual views as either true positive or true negative. As determined by a consensus of the panel, 25 dogs had at least one positive thoracic radiograph.
The three radiographic projections differed in sensitivity for the detection of lung metastases. In this study, the RLR view was the most sensitive, and the VD view the least sensitive. The sensitivity of detection improved significantly with multiple readers. From these data we recommend that, for detection of lung metastases in the dog, the RLR view be included in any diagnostic protocol; a minimum of two readers be used; and a three-view protocol be used if only one reader is available.  相似文献   

Rotation and Magnetism of Earth's Inner Core   总被引：1，自引：0，他引：1  

GA Glatzmaier  PH Roberts 《Science (New York, N.Y.)》1996,274(5294):1887-1891

Three-dimensional numerical simulations of the geodynamo suggest that a super- rotation of Earth's solid inner core relative to the mantle is maintained by magnetic coupling between the inner core and an eastward thermal wind in the fluid outer core. This mechanism, which is analogous to a synchronous motor, also plays a fundamental role in the generation of Earth's magnetic field.  相似文献   

Association of Hypercalcemia Before Treatment With Hypocalcemia After Treatment in Dogs With Primary Hyperparathyroidism          下载免费PDF全文

J.D. Dear  P.H. Kass  A.M. Della Maggiore  E.C. Feldman 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2017,31(2):349-354

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