The prevalence of bulimic symptomatology was determined in the female population of a state-funded chemical dependency treatment unit. Sixty women, 39 Caucasian and 21 Native American, all diagnosed with a psychoactive substance use disorder, were evaluated using both the Bulit-R and the eating disorder section of the Structured Clinical Interview for the DSM III-R to diagnose bulimia nervosa. The prevalence of bulimia was calculated to be 12% of the total subject group. Additionally, 3 anorectics were identified, resulting in a 17% rate of diagnosable eating disorders in the total group. Percentages of occurrence in the Caucasian group alone were 15% for bulimia and 23% for the combined eating disorders.

Adult↗

PubMedDate not supplied

Genetic influences on the effects of alcohol on auditory evoked potentials.

Effects of alcohol on auditory evoked potentials were examined in 77 subjects without a history of alcohol abuse. Subjects were monozygotic twins, dizygotic twins, siblings, and adoptees, all same-sexed and reared together. Alcohol was administered to achieve 0.1 g/dl blood levels. Ten additional control subjects received placebo doses. The amplitude of the P50 wave of the auditory evoked response was reproducibly diminished in alcohol-treated subjects compared to controls. Evoked potentials were recorded in a conditioning-testing paradigm, which uses paired stimuli. The second or test response is decremented compared to the first or conditioning response. The paradigm thus examines gating of response to sensory stimulation. In addition to the alcohol-induced decrease of the P50 amplitude in the conditioning response already noted, the ratio of the P50 test response amplitude to the conditioning response amplitude increased after alcohol. This change, reflective of decreased sensory gating, was variable between subjects, but showed high test-retest reliability. These effects of alcohol on P50 amplitude and its decrement in the conditioning-testing paradigm were used to examine possible genetic influences on sensitivity to alcohol. The latter parameter showed significantly higher correlations in monozygotic twins than in siblings or adoptees; dizygotic twins had intermediate values. The results suggest that alcohol's effects on suppression of P50 in the conditioning-testing paradigm may be genetically influenced.

Adoption↗

PubMedDate not supplied

Quantitative analyses of synaptic contacts of interneurons in the dorsal lateral geniculate nucleus of the squirrel monkey.

Three interneurons were recorded from and then injected with horseradish peroxidase in the parvocellular laminae of the squirrel monkey's (Saimiri sciureus) dorsal lateral geniculate nucleus. They were then examined using the electron microscope for their synaptic contacts, both the afferent contacts onto their dendrites and their presynaptic dendritic contacts onto presumptive projection (relay) neuron dendrites. The somata of these interneurons were small (mean = 178 microns 2), but the dendritic trees were large compared with those of projection neurons. All three interneurons had similar synaptic patterns onto their dendrites with about equal numbers of retinal, cortical, and GABAergic contacts. The distribution of these contacts was more uniform compared with the same types of contacts made onto projection neurons. The presynaptic dendrites were observed to contact only the dendrites of presumptive projection neurons, and these contacts were nearly all in the form of geniculate triads. None of the three interneurons displayed an axon. The receptive fields of these interneurons were similar to those of projection cells, but were larger and had center-response signs that were the opposite of the projection neurons around them (e.g. OFF center for the dorsal part of the parvocellular mass where ON-center projection neurons reside). The squirrel monkey data provides additional evidence that one aspect of the laminar pattern observed in the parvocellular pathway of the primate's dLGN might be related to a segregation of projection neurons of one center-response sign with interneurons of the opposite center-response sign.

Animals↗

PubMedDate not supplied

Effect of hyperbaric oxygen on human skin cells in culture and in human dermal and skin equivalents.

A critical stage of cutaneous wound healing is the development and maturation of the epidermis. In the aged, and in certain pathologies, this repair process is compromised due to a variety of deficiencies, one of which is tissue oxygenation. Several phases of wound healing are dependent on adequate tissue oxygen levels, and hyperbaric oxygenation has been shown to transiently elevate these levels. The use of human cell monolayers, dermal equivalents and human skin equivalents provide excellent opportunities for studying wound healing using in vivo relevant models. The goal of this study was to examine the effect of hyperbaric oxygen on cell proliferation, differentiation, and matrix biosynthesis in monolayer cultures and epidermopoiesis in the developing skin equivalent. Normal human dermal fibroblasts, keratinocytes and melanocytes, dermal equivalents and skin equivalents were exposed to hyperbaric oxygen at pressures up to three atmospheres, for up to 10 consecutive daily treatments lasting 90 minutes each. Increase in fibroblast proliferation (cf., 30% at 1 atmosphere after 10 days treatment), was observed without a significant effect on proliferation of normal human melanocytes and glycosaminoglycan synthesis. Stimulation of collagen synthesis after two days of treatment was only significant at 1 atmosphere (about 20% increase) but this differential was not observed after 5 days of treatment. Hyperbaric oxygenation above 2 atmospheres, inhibited proliferation of fibroblasts and keratinocytes in cell monolayer cultures (e.g., a 10 day treatment at 3 atmospheres appeared cytostatic to keratinocytes). In contrast, hyperbaric treatment up to 3 atmospheres dramatically enhanced keratinocyte differentiation, and epidermopoiesis in the complete human skin equivalent. These results support the importance of hyperbaric oxygen therapy in wound healing, and should provide an insight into oxygen utilization during repair of peripheral human tissue. The results also show the utility of the human skin equivalent as a model for evaluation of parameters involved in wound healing.

Cell Differentiation↗

PubMedDate not supplied

Prediction of respiratory distress during maximal physical exercise: the role of trait anxiety.

Industrial respirators offer protection for men and women who are required to work in toxic and oxygen-deficient environments. Major advances continue to be made with respect to improved face mask designs and modes of protection, yet only recently have efforts been directed toward the development of criteria for use in evaluating individuals' psychological fitness to wear respirators. The purpose of the present investigation was to confirm (i.e., replicate) an earlier finding, using a simplified protocol, that an individual's tendency to experience respiratory distress during exercise can be predicted. In the present experiment, an independent sample of 38 subjects underwent a maximal exercise test. It was predicted that subjects with elevated trait anxiety scores would experience respiratory distress when required to perform heavy physical exercise using a full-facepiece, air-line supplied, pressure-demand respirator. The prediction of respiratory distress was accurate in 34 of 38 cases (89.5%). It was concluded that an objective measure of trait anxiety can be used to identify those individuals who are most likely to experience distress while performing maximal physical exercise and using a pressure-demand respirator.

Adult↗