Deserción de los estudiantes de Anatomía en los exámenes parciales : Cursos 2008, 2009, 2010

La deserción de un alumno regular es siempre una situación traumática, para el estudiante, su entorno y para la Cátedra. En lo referente a esta última se plantea el análisis de las variables para estudiar las variables que pudieran intervenir. Se analizaron históricamente (2008, 2009 y 2010) los registros de los estudiantes, hasta la mitad de cursada anual de la Cátedra B de Anatomía (UNLP), las notas de los parciales, presentismo y las condiciones institucionales en la que los alumnos cursaron.Facultad de Ciencias Médica

How do validated measures of functional outcome compare with commonly used outcomes in administrative database research for lumbar spinal surgery?

Clinical interpretation of health services research based on administrative databases is limited by the lack of patient-reported functional outcome measures. Reoperation, as a surrogate measure for poor outcome, may be biased by preferences of patients and surgeons and may even be planned a priori. Other available administrative data outcomes, such as postoperative cross sectional imaging (PCSI), may better reflect changes in functional outcome. The purpose was to determine if postoperative events captured from administrative databases, namely reoperation and PCSI, reflect outcomes as derived by validated functional outcome measures (short form 36 scores, Oswestry disability index) for patients who underwent discretionary surgery for specific degenerative conditions of the lumbar spine such as disc herniation, spinal stenosis, degenerative spondylolisthesis, and isthmic spondylolisthesis. After reviewing the records of all patients surgically treated for disc herniation, spinal stenosis, degenerative spondylolisthesis, and isthmic spondylolisthesis at our institution, we recorded the occurrence of PCSI (MRI or CT-myelograms) and reoperations, as well as demographic, surgical, and functional outcome data. We determined how early (within 6 months) and intermediate (within 18 months) term events (PCSI and reoperations) were associated with changes in intermediate (minimum 1 year) and late (minimum 2 years) term functional outcome, respectively. We further evaluated how early (6–12 months) and intermediate (12–24 months) term changes in functional outcome were associated with the subsequent occurrence of intermediate (12–24 months) and late (beyond 24 months) term adverse events, respectively. From 148 surgically treated patients, we found no significant relationship between the occurrence of PCSI or reoperation and subsequent changes in functional outcome at intermediate or late term. Similarly, earlier changes in functional outcome did not have any significant relationship with subsequent occurrences of adverse events at intermediate or late term. Although it may be tempting to consider administrative database outcome measures as proxies for poor functional outcome, we cannot conclude that a significant relationship exists between the occurrence of PCSI or reoperation and changes in functional outcome

Essays on high-status fallacies

This dissertation comprises three essays. Each essay challenges some of the commonly held beliefs about and provides novel insights into the role of status in markets. In essay 1, I study the causal effect of producer status on the price premiums producers are able to charge for their products, the underlying cause for this premium, and producers' incentives to invest in quality under a fixed status hierarchy. In essays 2 and 3, I investigate on the organizational and individual level, respectively, how high-status affiliations affect an audience's evaluation of a social actor's identity. The contribution of these papers lies in highlighting reasons for, mechanisms through, and conditions under which high-status affiliations become a liability. Essay 1 addresses the recent debate about the causality, cause, and consequence of returns to status on the organizational level. I exploit the grand cru classification of chateaux of the Médoc created in 1855 as an unambiguous and exogenous status signal. I study its effect on wine prices and the incentive to invest in quality over a period of time during which information about producer and product quality has become increasingly munificent. As for the causality of status effects, I find evidence for causal returns to organizational status, but these returns are substantially overestimated if quality and reputation are not accurately controlled on the product level. As for the cause of status effects, I find that uncertainty is not a necessary condition and the taste for high-status products is a sufficient condition for returns to organizational status. As for the consequence of status effects, I find that higher-status producers' greater incentives to invest in quality are insufficient to enforce a separating equilibrium in producers' quality choices. The study cautions that causality claims in the status literature hinge upon proper identification, that returns to status can have alternative root causes, and that status hierarchies need not enshrine the quality hierarchy among producers. In essay 2, I propose that an organization's growth potential may suffer if its identity is confounded with or eclipsed by the high-status organizations with which it collaborates and competes. I devise two network measures to capture the degree to which identities are confounded or eclipsed. The theory is then tested with data on U.S. venture capital firm syndication between 1995 and 2009. The more a VC firm's identity is confounded with the identities of co-syndicating high-status firms, the smaller is the likelihood that it is able to raise a new fund. Further, the likelihood that an eclipsed identity hurts a VC firm's chances to raise a new fund increases in the firm's status. These findings suggest that in status-based market competition an organization needs to justify its identity claim by distinguishing itself from the established elite. Essay 3 picks up on anecdotal evidence that some audiences discount actors with strong high-status affiliations. This contradicts the extant literature, which in its overwhelming majority finds that an actor's chance to find audience approval for his identity increases in the strength of his high-status affiliations. In this article, I develop a unifying theoretical framework that is able to reconcile such seemingly contradictory effects. I propose that the optimal strength of high-status affiliations depends on an audience's taste for uniqueness/conformity in identity and the audience's uncertainty about the actor. An experiment shows that taste and uncertainty have interdependent effects, suggests that the extant status literature rests on implicit assumptions about audience taste, and highlights two conditions under which strong high-status affiliations are detrimental. Studies of rank mobility in academia and in a fraternity provide corroborating evidence for one of these conditions. Conformity-seeking audiences penalize too strong high-status affiliations if their uncertainty about the actor is high. The implications for identity design and social structure are discussed

Can commercially available wearable EEG devices be used for diagnostic purposes? An explorative pilot study

Electroencephalography (EEG) is a core element in the diagnosis of epilepsy syndromes and can help to monitor antiseizure treatment. Mobile EEG (mEEG) devices are increasingly available on the consumer market and may offer easier access to EEG recordings especially in rural or resource-poor areas. The usefulness of consumer-grade devices for clinical purposes is still underinvestigated. Here, we compared EEG traces of a commercially available mEEG device (Emotiv EPOC) to a simultaneously recorded clinical video EEG (vEEG). Twenty-two adult patients (11 female, mean age 40.2 years) undergoing noninvasive vEEG monitoring for clinical purposes were prospectively enrolled. The EEG recordings were evaluated by 10 independent raters with unmodifiable view settings. The individual evaluations were compared with respect to the presence of abnormal EEG findings (regional slowing, epileptiform potentials, seizure pattern). Video EEG yielded a sensitivity of 56% and specificity of 88% for abnormal EEG findings, whereas mEEG reached 39% and 85%, respectively. Interrater reliability coefficients were better in vEEG as compared to mEEG (x = 050 vs. 0.30), corresponding to a moderate and fair agreement. Intrarater reliability between mEEG and vEEG evaluations of simultaneous recordings of a given participant was moderate (x = 0.48). Given the limitations of our exploratory pilot study, our results suggest that vEEG is superior to mEEG, but that mEEG can be helpful for diagnostic purposes. We present the first quantitative comparison of simultaneously acquired clinical and mobile consumer-grade EEG for a clinical use-case. (C) 2019 Elsevier Inc. All rights reserved