Prospects of computer tomography in diagnosing adrenal tumors

Computed tomography (CT) is one of main topical methods of adrenal tumors diagnosis. Medical histories of 68 patients treated from 1995 to 2000 for various adrenal tumors were analyzed. CT was used in all the patients. These data were compared with results of morphological study. It is demonstrated that CT has high sensitivity in diagnosis of adrenal tumors (96.55% cases). It permits to predict the type of tumor with high probability. The degree of tumor size mistake made at CT was estimated. Mean coefficients to assess true sizes of tumors before surgery were calculated. This is important for choice of treatment policy in hormonal-unactive adrenal tumors.     

Videothoracosopy in diagnosis and surgical treatment of tuberculosis

From 1993 to May 2001, 795 psychiatric patients were treated including 563 with pleural effusion, 98 with multiple or solitary tuberculoma, 69 with tuberculous empyema, 14 with fibrotic-cavitary tuberculosis, 51 with disseminated tuberculosis. Mean age of the patients was 32 years. Survey of pleural cavity with pleural or lung biopsy was performed in 691 patients. In tuberculoma 14 lobectomies were performed, 23 patients underwent atypical lung resection without stapler (including with precise technique). Bilateral on-stage interventions were made in 32 patients. In empyema necrectomy and lung decortication were performed. 14 patients underwent videocavernoscopy with sequestrectomy and cavity drainage. In disseminated tuberculosis lung biopsy without staplers was usually performed. Aerohemostasis was achieved with plasma stream. One patient with empyema and one patient with pleural effusion died (lethality was 0.25%). Rate of postoperative complications was 7.5% in tuberculoma and 1.5% in disseminated tuberculosis. Conversion to thoracotomy was necessary in 3 (3%) patients with tuberculoma and 12 (17%) patients with empyema. Mean hospital stay was 4 days after diagnostic surgery and 7 days after lung resection. In pleural effusion diagnosis was verified in 98% cases, in disseminated tuberculosis--in 100%. Videothoracoscopy is the best diagnostic method for pleural effusion and disseminated forms of lung tuberculosis and operation of choice in tuberculoma and empyema. Videothoracoscopy in tuberculosis is highly effective and associates with low rate of postoperative complications and lethality.     

Analysis of surgical treatment results of primary hyperparathyroidism

For the 1967-2000 period 134 patients with primary hyperparathyroidism (PHPTH) were treated in the clinic. Clinico-morphological characteristics of PHPTH were analyzed. In majority of the patients the mixed form of PHPTH was revealed. In 90% of patients solitary adenoma of parathyroid gland had constituted the morphological substrate of the disease. In 117 (87%) of patients positive result of treatment was noted. In 18 (15%) of patients postoperative permanent hypoparathyroidism occurred. Seven (4.5%) patients died. For the improvement of early diagnosis and effective treatment it is necessary to secure wide screening of the calcium content, peculiarly in patients, constituting the risk group.     

The psychophysiology of real-time financial risk processing

A longstanding controversy in economics and finance is whether financial markets are governed by rational forces or by emotional responses. We study the importance of emotion in the decision-making process of professional securities traders by measuring their physiological characteristics (e.g., skin conductance, blood volume pulse, etc.) during live trading sessions while simultaneously capturing real-time prices from which market events can be detected. In a sample of 10 traders, we find statistically significant differences in mean electrodermal responses during transient market events relative to no-event control periods, and statistically significant mean changes in cardiovascular variables during periods of heightened market volatility relative to normal-volatility control periods. We also observe significant differences in these physiological responses across the 10 traders that may be systematically related to the traders' levels of experience.     

Altering electrical connections in the nervous system of the pteropod mollusc Clione limacina by neuronal injections of gap junction mRNA

Neurons can communicate with each other either via exchange of specific molecules at synapses or by direct electrical connections between the cytoplasm of either cell [for review see Bruzzone et al. (1996) Eur. J. Biochem., 238, 1-27]. Although electrical connections are abundant in many nervous systems, little is known about the mechanisms which govern the specificity of their formation. Recent cloning of the innexins--gap junction proteins responsible for electrical coupling in invertebrates (Phelan et al. (1998) Trends Genet., 14, 348-349], has made it possible to study the molecular mechanisms of patterning of the electrical connections between individual neurons in model systems. Here we demonstrate that intracellular injection of mRNA encoding the molluscan innexin Panx1 (Panchin et al. 2000 Curr. Biol., 10, R473-R474) drastically alters the specificity of electrical coupling between identified neurons of the pteropod mollusc Clione limacina.     

Expression pattern of mitochondrial respiratory chain enzymes in skeletal muscle of patients harboring the A3243G point mutation or large-scale deletions of mitochondrial DNA

To assess the detailed expression pattern of mitochondrial-encoded proteins in skeletal muscle of patients with mitochondrial diseases we performed determinations of cytochrome content and enzyme activities of respiratory chain complexes of 12 patients harboring large-scale deletions and of 10 patients harboring the A3243G mutation. For large-scale deletions we observed a mutation gene dose-dependent linear decline of cytochrome aa3 content, cytochrome c oxidase (COX) activity, and complex I activity. The content of cytochromes b and the complex III activity was either not affected or only weakly affected by the deletion mutation and did not correlate to the degree of heteroplasmy. In contrast, in skeletal muscle harboring the A3243G mutation all investigated enzymes containing mitochondrial-encoded subunits were equally affected by the mutation, but we observed milder enzyme deficiencies at a comparable mutation gene dose. The results of single fiber analysis of selected biopsies supported these findings but revealed differences in the distribution of COX deficiency. Whereas predominantly type I fibers were affected in A3243G and deletion CPEO biopsies, we observed in MELAS and KSS biopsies higher quantities of COX-deficient type 2 fibers. Our findings indicate different pathomechanisms of deletion and A3243G mutations.     

Chemical amplification with encapsulated reagents

Autocatalysis and chemical amplification are characteristic properties of living systems, and they give rise to behaviors such as increased sensitivity, responsiveness, and self-replication. Here we report a synthetic system in which a unique form of compartmentalization leads to nonlinear, autocatalytic behavior. The compartment is a reversibly formed capsule in which a reagent is sequestered. Reaction products displace the reagent from the capsule into solution and the reaction rate is accelerated. The resulting self-regulation is sensitive to the highly selective molecular recognition properties of the capsule.     

Evolutionarily new sequences expressed in tumors

Background  

Earlier we suggested the concept of the positive evolutionary role of tumors. According to this concept, tumors provide conditions for the expression of evolutionarily new and/or sleeping genes in their cells. Thus, tumors are considered as evolutionary proving ground or reservoir of expression. To support this concept we have previously characterized in silico and experimentally a new class of human tumor-related transcribed sequences.     

Clinical characteristics of individuals with germline mutations in BRCA1 and BRCA2: analysis of 10,000 individuals.

PURPOSE: To assess the characteristics that correlate best with the presence of mutations in BRCA1 and BRCA2 in individuals tested in a clinical setting. PATIENTS AND METHODS: The results of 10,000 consecutive gene sequence analyses performed to identify mutations anywhere in the BRCA1 and BRCA2 genes (7,461 analyses) or for three specific Ashkenazi Jewish founder mutations (2,539 analyses) were correlated with personal and family history of cancer, ancestry, invasive versus noninvasive breast neoplasia, and sex. RESULTS: Mutations were identified in 1,720 (17.2%) of the 10,000 individuals tested, including 968 (20%) of 4,843 women with breast cancer and 281 (34%) of 824 with ovarian cancer, and the prevalence of mutations was correlated with specific features of the personal and family histories of the individuals tested. Mutations were as prevalent in high-risk women of African (25 [19%] of 133) and other non-Ashkenazi ancestries as those of European ancestry (712 [16%] of 4379) and were significantly less prevalent in women diagnosed before 50 years of age with ductal carcinoma in situ than with invasive breast cancer (13% v 24%, P =.0007). Of the 74 mutations identified in individuals of Ashkenazi ancestry through full sequence analysis of both BRCA1 and BRCA2, 16 (21.6%) were nonfounder mutations, including seven in BRCA1 and nine in BRCA2. Twenty-one (28%) of 76 men with breast cancer carried mutations, of which more than one third occurred in BRCA1. CONCLUSION: Specific features of personal and family history can be used to assess the likelihood of identifying a mutation in BRCA1 or BRCA2 in individuals tested in a clinical setting.     

Association between allergy and anxiety disorders in youth

OBJECTIVE: Studies have documented associations between anxiety disorders and allergy in adults, but these associations have not been studied extensively in children. The objective of this study is to examine the associations between allergy and six anxiety disorders (AD) in youth. METHOD: This is a data analysis of two epidemiologic-services studies: (i) alternative service use patterns of youth with serious emotional disturbance (n = 936), and (ii) methods for the epidemiology of child and adolescent mental disorders (n = 1285). Child psychiatric diagnoses were measured by the diagnostic interview schedule for children. Allergy was assessed by the service utilization and risk factors interview. RESULTS: Among ADs, the strongest association found was between allergy and panic disorder (adjusted odds ratio 5.0; p < or = 0.001). Associations of allergy and the other ADs do not seem to be clinically significant. CONCLUSIONS: Findings suggest that in some patients panic disorder may be associated with hypersensitivity of immune system. Panic disorder should be considered in anxious children reporting allergy when no organic cause of allergy is found, and likewise allergy should considered in children with panic disorder.