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Biomedical subjects

J E Salem

Publications and source records attributed to J E Salem.

10 recordsLinked to original sources
PubMed2004

Step and ramp induction of myocardial ischemia: comparison of in vivo and in silico results.

This study tested the robustness of our computational model of myocardial metabolism by comparing responses to two different inputs with experimental data obtained in pigs under similar conditions. Accordingly, an abrupt and a gradual reduction in coronary flow of similar magnitude were implemented and used as model input. After flow reductions reached 60% from control values, ischemia was kept constant for 60 min in both groups. Our hypotheses were that: (1) these two flow-reduction profiles would result in different transients (concentrations and flux rates) while having similar steady-state values and (2) our model-simulated responses would predict the experimental results in an anesthetized swine model of myocardial ischemia. The two different ischemia-induction patterns resulted in the same decrease in steady-state MVO2 and in similar steady-state values for metabolite concentrations and flux rates at 60 min of ischemia. While both the simulated and experimental results showed decreased glycogen concentration, accumulation of lactate, and net lactate release with ischemia, the onset of glycogen depletion and the switch to lactate efflux were more rapid in the experiments than in the simulations. This study demonstrates the utility of computer models for predicting experimental outcomes in studies of metabolic regulation under physiological and pathological conditions.

Animals↗
PubMed1998

The role of gender differences in the reduction of etiologic heterogeneity in schizophrenia.

Recent research has shown a resurgence of interest in the study of gender differences in schizophrenia. Accumulated evidence suggests that, compared with women, men have a higher incidence of schizophrenia, earlier age of onset, poorer course and medication response, poorer premorbid social and intellectual functioning, fewer affective symptoms, lower family morbid risk of schizophrenia and affective disorders, more evidence of obstetric complications in their mothers, and greater structural brain abnormalities. The roles of estrogen, neurodevelopment, and family history of affective disorder are evaluated as co-contributors to the observed gender differences in schizophrenia. Particular emphasis is given to evaluating the hypothesis that men are more prone to a hypothesized poor-prognosis, neurodevelopmental subtype of schizophrenia, for which early environmental brain insults play an important etiologic role, whereas women may be more prone to a hypothesized good-prognosis, affective subtype that is genetically related to the affective disorders. This hypothesis is evaluated in terms of (a) its ability to account for gender differences in schizophrenia, (b) its ability to link differences in clinical presentation to proposed differences in etiology; and (c) its potential to generate testable predictions for future schizophrenia research.

Adult↗
PubMed1996

More evidence for generalized poor performance in facial emotion perception in schizophrenia.

Previous studies showing that schizophrenic patients have a deficit in the ability to perceive facial expressions of emotion in others often have not used a differential deficit design and standardized measures of emotion perception. Using standardized and cross-validated measures in a differential deficit design, S. L. Kerr and J. M. Neale (1993) found no evidence for a deficit specific to emotion perception among unmedicated schizophrenic patients. The present study replicated and extended the findings of Kerr and Neale in a sample of medicated schizophrenic patients. Results showed that medicated patients performed more poorly than controls overall; however, they performed no worse on facial emotion perception tasks than on a matched control task. These findings support Kerr and Neale's conclusion that schizophrenic patients do not have a differential deficit in facial emotion perception ability. Future research should examine the nature of schizophrenic patients generalized poor performance on tests of facial emotion perception.

Adult↗