Effect of the recently established admissions procedure on success in the first-year exams at the University of Veterinary Medicine Vienna, Austria

RATIONALE FOR THIS STUDY

The purpose of this study was to compare the success during the first academic year of students who underwent an admissions procedure (class 2005) and students of the three previous classes (2002-2004), who did not undergo an admissions procedure but took their exams under the same curricular framework.

METHODOLOGY

Exam results of 802 students of the 2002-2004 classes were compared with those of 181 students from the 2005 class.

RESULTS

Students of the 2005 class were more likely to pass all three exams given in the first academic year than students of the 2002-2004 classes (p < 0.001; OR = 3.2), and the quality of two of the three exams (indicated by individual scores) was also significantly better in 2005 than in the preceding classes (p < 0.001). In unselected classes, 25% to 31% of students showed no successful attempts to pass any of the three exams currently administered.

CONCLUSION

The implementation of an admissions procedure measuring, among other indicators, academic ability has significantly improved first-year exam performance. Incoming students presenting with higher scores on academic standards are more likely to complete their courses successfully.

Admissions procedures at the University of Veterinary Medicine Vienna, Austria

RATIONALE FOR THIS STUDY

The admission procedure implemented in fall 2005 in consequence of new laws passed in summer 2005 is described and evaluated. The general set-up, the underlying considerations, and the changes resulting from the establishment of this procedure are presented.

METHODOLOGY

Admission variables and demographic information (sex, age, nationality) for 172 students who entered their first academic year at the University of Veterinary Medicine Vienna (VUW) and their academic performance measured according to their results in the three first-year examinations (successful versus unsuccessful) were assessed. Logistic regression was used to examine the relationship between predictor and outcome.

RESULTS

Regression analysis indicates that Austrian students were more likely to be unsuccessful than German students (R(2) = 0.366, p < 0.001). Previous school performance was the best predictor for success in the Austrian cohort (R(2) = 0.196; p < 0.001), whereas the personal interview scores provided the best predictor in the German cohort (R(2) = 0.122; p < 0.05).

CONCLUSION

This study supports our existing selection practices relating to cognitive and non-cognitive skills. The number of strugglers may be reduced on the basis of an admissions procedure, but struggling may not be excluded by the existing selection practices, which do not assess a specific threshold but are related to a score-ranking system and a predefined number of available openings in the program.

Arteriogenesis depends on circulating monocytes and macrophage accumulation and is severely depressed in op/op mice

It has been suggested that monocytes/macrophages represent the pivotal cell type during early adaptive growth of pre-existent arterial anastomoses toward functional collateral arteries (arteriogenesis) upon arterial occlusion. This hypothesis was supported by previous studies providing evidence that elevation of the peripheral monocyte count, increased monocyte survival (e.g., granulocyte macrophage-colony stimulating factor), as well as enhanced attraction or adhesion (e.g., monocyte chemoattractant protein 1; intercellular adhesion molecule 1) of the latter cells correlates directly with the arteriogenic response to restore tissue perfusion. However, the experimental proof of the essential role of monocytes/macrophages remains to be given. We therefore hypothesized that arteriogenesis is reduced in a genuine, nonpharmocologically induced monocyte/macrophage-deficient model of femoral artery occlusion in osteopetrotic (op/op) mice. Total leukocyte count did not differ between op/op mice and control (B6C3Fe a/a-Csf1(+/+)) mice. op/op mice show a significant monocytopenia (0.67%+/-0.38% vs. 1.53%+/-0.32%), granulocytosis (33.66%+/-6.67% vs. 22.83+/-7.47%), and a concomitant, relative lymphopenia (65.67%+/-6.58% vs. 75.65%+/-7.31%). Microsphere-based perfusion measurement 7 days after femoral artery occlusion demonstrated a significantly reduced perfusion restoration upon femoral artery occlusion in op/op mice as compared with controls (28.19%+/-0.91% vs. 47.88%+/-2.49%). The application of a novel method of high resolution (microfocus X-ray system) angiography revealed a reduction of proliferation and diameter of collateral arteries. Quantitative immunohistology showed significantly lower numbers of macrophages in the surrounding tissue of proliferating arteries. This study provides additional evidence for the preeminent role of monocytes/macrophages during arteriogenesis in a genuine model of monocyte deficiency, i.e., without pharmacological intervention.

Assessment of the geometry of the cubital (elbow) joint of dogs by use of magnetic resonance imaging

OBJECTIVE

To assess joint geometry and highlight potential evidence of physiologic incongruity in cubital (elbow) joints of large, small, and chondrodystrophic breeds of dogs.

SAMPLE POPULATION

Nonarthritic elbow joints obtained from cadavers of mature dogs of large breeds (n = 19), small breeds (14), or chondrodystrophic breeds (8).

PROCEDURE

Magnetic resonance imaging was used to quantify interosseous gaps at 6 defined positions and 2 sagittal planes of the humeroantebrachial region by use of a fat-suppressed 3-dimensional gradient-echo sequence.

RESULTS

Interosseous gaps in the more medially located sagittal plane were significantly narrower at the level of the anconeal process than at any other position of the joint in large-breed dogs, compared with results for small- or chondrodystrophic-breed dogs. In both sagittal planes, the gaps were significantly wider at the center of the ulnar trochlear notch than at any other position. Significant correlation between body weight and width of the interosseous gaps was found only in large-breed dogs and was found in both sagittal planes at the center of the ulnar trochlear notch (r, 0.834 and r, 0.680, respectively).

CONCLUSIONS AND CLINICAL RELEVANCE

In large-breed dogs, the interosseous gap was especially narrow at the level of the anconeal process and its diametric position. This suggests less ability to compensate intra-articular steps in dogs with short ulna syndrome, which predisposes to failure of the union between the anconeal process and olecranon. Geometric incongruity may be regarded as clinically normal in nonarthritic humeroulnar joints. The degree of geometric incongruity increases with body weight.

Comparative assessment of bone mineral measurements obtained by use of dual-energy x-ray absorptiometry, peripheral quantitative computed tomography, and chemical-physical analyses in femurs of juvenile and adult dogs

OBJECTIVE

To compare bone mineral measurements obtained by use of dual-energy x-ray absorptiometry (DEXA), peripheral quantitative computed tomography (pQCT), and chemical-physical analyses and determine effects of age and femur size on values obtained for the various techniques.

SAMPLE POPULATION

Femurs obtained from 15 juvenile and 15 adult large-breed dogs.

PROCEDURE

n each femur, 7 regions of interest were examined by use of DEXA to measure the bone mineral content (BMC) and bone mineral density (BMD), and 5 were examined by use of pQCT to measure BMD. Among these, 1 region was examined by both noninvasive methods and an invasive method. Volume of the femur was determined by water displacement. Volumetric bone density (VBD) was calculated. Calcium (Ca), phosphorus (P), total Ca, and total P contents were determined.

RESULTS

DEXA- and pQCT-derived results revealed that all values increased with age in juvenile dogs. In adults, VBD and pQCT-derived BMD decreased significantly and DEXA-derived BMD increased with increasing femur length. The pQCT-derived BMD correlated well with VBD and Ca content, whereas DEXA-derived BMC was strongly correlated with Ca content. In juveniles, values correlated regardless of the technique used, whereas in adult dogs, DEXA-derived BMD did not correlate with pQCT-derived BMD, Ca concentration, or VBD unless data were adjusted on the basis of femur length.

CONCLUSIONS AND CLINICAL RELEVANCE

DEXA-derived BMD adjusted for femur length yields approximately the same percentage variability in VBD as for pQCT-derived BMD. However, pQCT-derived BMD is still more sensitive for determining variability BMD in Ca concentration, compared with DEXA-derived BMD adjusted for femur length.

Use of routine ventrodorsal radiographic views of the pelvis to assess inclination of the wings of the sacrum in dogs

OBJECTIVE

To determine the ratio of ventral-to-dorsal transverse diameters between the wings of the sacrum on ventrodorsal radiographic views of the pelvis in large dogs and to validate the reliability of this morphometric analysis for functional interpretation.

SAMPLE POPULATION

Pelvic specimens from 40 large-breed dogs and radiographs of 113 large-breed dogs.

PROCEDURE

In an anatomic and radiographic evaluation, the transverse dorsal diameter (TVDS) and transverse ventral diameter (TVV) between the wings of the sacrum were evaluated in sacrum specimens and on corresponding radiographs of the pelvis and sacrum. The ratio between TVV and TVDS (VD ratio) was calculated. Intraobserver reliability was determined by calculation of the coefficient of variation. In a retrospective radiographic evaluation, the VD ratio was determined in Rottweilers, Golden Retrievers, and German Shepherd Dogs. Correlations between VD ratio and breed, age, and sex were tested.

RESULTS

The VD ratio was significantly higher in Rottweilers than in Golden Retrievers and German Shepherd Dogs, denoting an oblique alignment of the sacral wings in Rottweilers (ie, the dorsal aspects of the sacral wings were located more medially than the ventral aspects) and an almost sagittal alignment in the other breeds. The VD ratio was significantly associated with age but not with sex.

CONCLUSIONS AND CLINICAL RELEVANCE

Sagittal alignment of the wings of the sacrum is considered to be biomechanically less efficient. These results provide a basis for further studies to evaluate radiographic assessment of the sacroiliac joints similar to the evaluation for hip dysplasia.

A novel interpolation strategy for estimating subsample speckle motion

Multidimensional, high-resolution ultrasonic imaging of rapidly moving tissue is primarily limited by sparse sampling in the lateral dimension. In order to achieve acceptable spatial resolution and velocity quantization, interpolation of laterally sampled data is necessary. We present a novel method for estimating lateral subsample speckle motion and compare it with traditional interpolation methods. This method, called grid slopes, requires no a priori knowledge and can be applied to data with as few as two samples in the lateral dimension. Computer simulations were performed to compare grid slopes with two conventional interpolation schemes, parabolic fit and cubic spline. Results of computer simulations show that parabolic fit and cubic spline performed poorly at translations greater than 0.5 samples, and translations less than 0.5 samples were subject to an estimation bias. Grid slopes accurately estimated translations between 0 and 1 samples without estimation bias at high signal-to-noise ratios. Given that the grid slopes interpolation technique performs well at high signal-to-noise ratios, one pertinent clinical application might be tissue motion tracking.

Ensemble tracking for 2D vector velocity measurement: Experimental and initial clinical results

We describe a new method, called ensemble tracking, for estimating two-dimensional velocities with ultrasound. Compared to previous speckle tracking techniques, ensemble tracking measures motion over smaller times and distances, increasing maximum velocities and reducing errors due to echo decorrelation. Ensemble tracking uses parallel receive processing, 2D pattern matching, and interpolation of the resulting tracking grid to estimate sub-pixel speckle translations between successive ultrasonic acquisitions. In this study, small translations of a tissue mimicking phantom were quantified at transducer angles of 0 degrees , 45 degrees , and 90 degrees . Measurements over three parallel beam spacings and all transducer angles had mean errors from -4% to +11%, when parallel beam amplitudes were normalized. Such amplitude normalization substantially improved results at 45 degrees and 90 degrees . The amplitude, spacing, and correlation between the parallel beams were quantified, and their effects on the accuracy and precision of estimates are discussed. Finally, initial clinical results demonstrate the ability to track and display blood flow in the carotid artery.

Familial occurrence of alpha 1-antitrypsin deficiency and Weber-Christian disease

Severe panniculitis of the Weber-Christian type occurred in two brothers, both with marked alpha 1-antitrypsin (alpha 1-AT) deficiency and phenotype PiZZ. Studies of inflammatory and immunologic function were undertaken in these two patients as well as in a third brother with severe alpha 1-AT deficiency but without Weber-Christian disease. The findings of these investigations were suggestive of exaggerated immunologic and inflammatory function with enhanced lymphocyte responsiveness to phytohemagglutinin, enhanced activation of neutrophils and monocytes, and accelerated delayed hypersensitivity responses in all three subjects. This hyperreactivity may explain the apparent association of alpha 1-AT deficiency with Weber-Christian disease.