Non-invasive measurement of intra-abdominal pressure: a preliminary study

The importance of measuring intra-abdominal pressure (IAP) has increased since the negative effects of sustained increased IAP, also known as intra-abdominal hypertension (IAH), have become known. The relation between IAP and abdominal wall tension has been included in several reports. We have developed a device to measure abdominal wall tension by measuring force and distance. This device enables us to investigate the correlation between the abdominal wall tension and IAP. The abdomens of two corpses (one female, one male) were insufflated with air. IAP was increased and measured at intervals by means of a laparoscopic set-up. Abdominal tension was measured at seven points on the abdominal wall at each interval. Pearson's correlation coefficients were used to determine the relationship between IAP and tension for each point measured. ANOVA was used to assess relations between measured tensions versus applied pressure, locations and subjects. In both corpses, all points showed significant (p < 0.001) correlations between IAP and abdominal wall tension. The points along the mid transverse plane appear to be more similar compared to more cranial and caudal points. We have assessed the feasibility of a device that non-invasively can track changes in IAP. Measurements performed with the device are preliminary results, and further investigation is needed.     

Self-reported psychopathological symptoms and quality of life in outpatients with bipolar disorder

PURPOSE. Patients with bipolar disorder in a euthymic mood state can suffer from subsyndromal or residual symptoms of depression or hypomania. This study was undertaken to gain insight into the broader spectrum of psychopathological symptoms and quality of life. DESIGN AND METHODS. Participants (n = 157) completed the Symptoms Checklist‐90, the World Health Organization Quality of Life Assessment Instrument–Bref, and a questionnaire addressing demographic and clinical characteristics. FINDINGS. Outpatients with bipolar disorder reported fewer symptoms of psychopathology than psychiatric outpatients in general, but relative to the general population, a significantly lower quality of life was reported. The number of symptoms showed consistently negative correlations with the quality of life. PRACTICE IMPLICATIONS. The results of this study urge nurses to not settle for treatment response in terms of reduced manic or depressive episodes, but instead to strive for full remission of all symptoms.     

Psychiatric disorders and symptom severity in referred versus non-referred overweight children and adolescents

Background  This study aimed firstly to investigate whether youngsters referred for overweight treatment differ from non-referred overweight youngsters on the prevalence of psychiatric disorders and psychological symptoms. Secondly, the potentially moderating role of age, gender, socio-economic status and degree of overweight in the association of referral status and mental disorder in overweight youth was explored. Methods  Participants were 155 overweight youngsters enrolled in an obesity treatment programme (mean age = 13.76; mean BMI  = 33.99) and 73 non-referred overweight youngsters (mean age = 13.74; mean BMI  = 27.35). The Structured Clinical Interview for DSM-IV-Childhood version and the Child version of the Eating Disorder Examination were administered and participants filled out the Children’s Depression Inventory, the Spence Children’s Anxiety Scale and the Youth Self Report. Parents were asked to complete the Child Behavior Checklist. Results  In the referred group 37.50% and in the non-referred group 23.29% of the participants met criteria for at least one mental disorder. In both groups, anxiety disorders were most prominent. Overall, a higher prevalence of mental disorders was found in the referred group. Referred youth displayed significantly more ‘full blown’ eating disorders and binge eating than non-referred youngsters and exhibited a significantly greater severity of self- and parent-reported internalizing symptoms. Referral was also associated with a significantly higher degree of overweight and significantly lower SES. After controlling for these pre-existing differences in degree of overweight and SES, only the greater severity of parent-reported internalizing symptoms in referred youth remained significant. Older age was generally predictive for the presence of mental disorders and in the non-referred group SES was positively associated with psychiatric disorder. Conclusions  A substantial proportion of overweight youngsters suffer from mental disorders. Referral status and age are associated with the presence of psychopathology. However, differences between referred and non-referred youngsters are not as pronounced as expected on the basis of earlier research in the field.     

Selective processing of social stimuli in the superficial amygdala

The human amygdala plays a pivotal role in the processing of socially significant information. Anatomical studies show that the human amygdala is not a single homogeneous structure but is composed of segregable subregions. These have recently been functionally delineated by using a combination of functional magnetic resonance imaging (fMRI) and cytoarchitectonically defined probabilistic maps. However, the response characteristics and individual contribution of these subregions to the processing of social‐emotional stimuli are little understood. Here, we used this novel technique to segregate intra‐amygdalar responses to facial expressions and nonsocial control stimuli. We localized facial expression‐evoked signal changes bilaterally in the superficial amygdala, which suggests that this subregion selectively extracts the social value of incoming sensory information. Hum Brain Mapp, 2009. © 2009 Wiley‐Liss, Inc.     

Visual presentation of phobic stimuli: amygdala activation via an extrageniculostriate pathway?

In the present study, event-related functional magnetic resonance imaging (fMRI) was used to examine the neural correlates of phobic fear by exposing spider phobic subjects to a visual presentation of spiders. In contrast to control subjects, spider phobics showed significantly increased activation in the amygdala and the pulvinar nucleus of the thalamus on the basis of region of interest (ROI) analysis. Furthermore, voxelwise analysis revealed increased activation related to phobia-specific pictures bilaterally in the anterior cingulate cortex, the left insular cortex and bilaterally in the supplementary motor area. These findings confirm the involvement of the amygdala in the processing of phobia-relevant stimuli as found earlier in a recent study. Moreover, the thalamus findings support the involvement of an extrageniculostriate pathway in the process of phobic fear.     

Evaluation of Chromogenic Media for Detection of Methicillin-Resistant Staphylococcus aureus

Rapid laboratory diagnosis is critical for treating, managing, and preventing methicillin-resistant Staphylococcus aureus (MRSA) infections. We evaluated and compared the potential for MRSA detection of five chromogenic media, Brilliance MRSA agar (Oxoid), ChromID (bioMérieux), MRSASelect (Bio-Rad), CHROMagar (CHROMagar Microbiology), and BBL-CHROMagar (BD Diagnostics). Media were tested with log serial dilutions (10⁰ to 10⁶ CFU) of pure isolates of MRSA (n = 60), non-MRSA (n = 27), and defined mixtures thereof simulating clinical samples (n = 84). Further evaluations were done on pre-enriched nasal and groin screening swabs (n = 213) from 165 hospitalized patients. Randomized samples were spiral plated on each medium and independently scored by five investigators for characteristic colonies at 24 and 48 h of incubation. Confirmatory testing of up to five putative MRSA colonies recovered from each medium was done. The cumulative average sensitivity with isolates, mixtures, and clinical samples was the highest for Brilliance MRSA agar (97%) and similar for the other four media (≥92%). The cumulative average specificity was the highest for BBL-CHROMagar (99%), followed by MRSASelect (98%), CHROMagar (97%), ChromID (89%), and Brilliance MRSA agar (86%). All of the media detected MRSA at 10 and 1 CFU, although at these low loads, few MRSA samples harboring SCCmec type III or IV were misinterpreted as non-MRSA by investigators. False-positive results were mainly due to methicillin-resistant S. epidermidis. For an arbitrary MRSA prevalence of 5% and based on patient sample evaluations, the positive predictive values for BBL-CHROMagar and CHROMagar (∼84%) were the highest. The negative predictive values of all of the media were ≥92% for MRSA prevalences ranging from 5% to 30%. In conclusion, BBL-CHROMagar and CHROMagar gave the best overall results for detection of MRSA, irrespective of the sample concentration, investigator, or incubation period.Methicillin-resistant Staphylococcus aureus (MRSA) has emerged as a major nosocomial pathogen in the last decade. Patients colonized with MRSA serve as reservoirs of self-infection or dissemination to other patients and to the hospital environment (6, 12, 22). Hence, screening for MRSA carriage and contact isolation of MRSA carriers are crucial for effective hospital infection control (9). Employing rapid and sensitive screening assays for MRSA detection could help to further improve infection control, as well as decrease costs (10, 13).In recent years, the use of chromogenic media has become a key method for the rapid identification of microorganisms in clinical samples (20). These media detect key microbial enzymes as diagnostic markers for pathogens through the use of “chromogenic” substrates incorporated into a solid-agar-based matrix (20). In contrast to conventional culture media, chromogenic media allow direct colony color-based identification of the pathogen from the primary culture. This reduces the need for subculture for further biochemical testing and hence the time until a result is obtained. Currently available chromogenic media for MRSA detection incorporate chromogens to differentiate S. aureus from other pathogens and antibiotics for selective growth of MRSA. These media differ in their chromogenic substrates, antibiotic formulations, and/or concentrations, factors that impact their sensitivity and specificity for MRSA detection (reviewed in reference 13). We compared the potential of five of the most commonly used commercial chromogenic media for MRSA detection using pure MRSA isolates, non-MRSA isolates, and mixtures thereof at defined concentrations simulating clinical samples. Further evaluations of the media were carried out with nasal and groin screening samples from hospitalized patients.(Part of this work was presented at the 48th Interscience Conference on Antimicrobial Agents and Chemotherapy, Washington, DC, 24 to 28 October 2008.)     

Pure direct duplication (12)(q24.1-->q24.2) in a child with Marcus Gunn phenomenon and multiple congenital anomalies

Partial trisomy of the region 12q24.1-->q24.2 is rare and usually associated with other rearrangements. We report on the clinical and cytogenetic findings in a girl with a pure de novo direct duplication dup(12)(q24.1-->q24.2). She had developmental and growth retardation, facial dysmorphism with upslanting palpebral fissures, wide downturned mouth, short neck, and Marcus Gunn phenomenon. She also had single transverse creases, hypoplasia of the corpus callosum, and cardiac malformations consisting of a bicuspid aortic valve, multiple ventricular septal defects, and kinking of the aorta. The size of the duplication was characterized by molecular cytogenetics and comparative genomic hybridization (CGH) to be 11.5 Mb in size and extended from the BAC probe RP11-256L11 loci (108.2 Mb) +/- 1 Mb to the BAC probe RP11-665J20 loci (119.7 Mb) +/- 1 Mb. No such pure 12q24 duplication was detected out of the 23 patients reported in the literature with duplications in 12q region. Comparison with these reported 12q trisomies suggests the duplication dup(12)(q24.1-->q24.2) is associated with a recognizable phenotype consisting of characteristic facial dysmorphism, growth retardation, and cardiac malformation.     

Hepatitis C virus-induced hepatocellular carcinoma

Hepatitis C virus (HCV) is a leading etiology of hepatocellular carcinoma (HCC). The interaction of HCV with its human host is complex and multilayered; stemming in part from the fact that HCV is a RNA virus with no ability to integrate in the host''s genome. Direct and indirect mechanisms of HCV-induced HCC include activation of multiple host pathways such as liver fibrogenic pathways, cellular and survival pathways, interaction with the immune and metabolic systems. Host factors also play a major role in HCV-induced HCC as evidenced by genomic studies identifying polymorphisms in immune, metabolic, and growth signaling systems associated with increased risk of HCC. Despite highly effective direct-acting antiviral agents, the morbidity and incidence of liver-related complications of HCV, including HCC, is likely to persist in the near future. Clinical markers to selectively identify HCV subjects at higher risk of developing HCC have been reported however they require further validation, especially in subjects who have experienced sustained virological response. Molecular biomarkers allowing further refinement of HCC risk are starting to be implemented in clinical platforms, allowing objective stratification of risk and leading to individualized therapy and surveillance for HCV individuals. Another role for molecular biomarker-based stratification could be enrichment of HCC chemoprevention clinical trials leading to smaller sample size, shorter trial duration, and reduced costs.