Nevin Manimala

Part Fibre Toxicol. 2022 Apr 22;19(1):30. doi: 10.1186/s12989-022-00469-8.

ABSTRACT

BACKGROUND: Considering the expanding industrial applications of carbon nanotubes (CNTs), safety assessment of these materials is far less than needed. Very few long-term in vivo studies have been carried out. This is the first 2-year in vivo study to assess the effects of double walled carbon nanotubes (DWCNTs) in the lung and pleura of rats after pulmonary exposure.

METHODS: Rats were divided into six groups: untreated, Vehicle, 3 DWCNT groups (0.12 mg/rat, 0.25 mg/rat and 0.5 mg/rat), and MWCNT-7 (0.5 mg/rat). The test materials were administrated by intratracheal-intrapulmonary spraying (TIPS) every other day for 15 days. Rats were observed without further treatment until sacrifice.

RESULTS: DWCNT were biopersistent in the rat lung and induced marked pulmonary inflammation with a significant increase in macrophage count and levels of the chemotactic cytokines CCL2 and CCL3. In addition, the 0.5 mg DWCNT treated rats had significantly higher pulmonary collagen deposition compared to the vehicle controls. The development of carcinomas in the lungs of rats treated with 0.5 mg DWCNT (4/24) was not quite statistically higher (p = 0.0502) than the vehicle control group (0/25), however, the overall incidence of lung tumor development, bronchiolo-alveolar adenoma and bronchiolo-alveolar carcinoma combined, in the lungs of rats treated with 0.5 mg DWCNT (7/24) was statistically higher (p < 0.05) than the vehicle control group (1/25). Notably, two of the rats treated with DWCNT, one in the 0.25 mg group and one in the 0.5 mg group, developed pleural mesotheliomas. However, both of these lesions developed in the visceral pleura, and unlike the rats administered MWCNT-7, rats administered DWCNT did not have elevated levels of HMGB1 in their pleural lavage fluids. This indicates that the mechanism by which the mesotheliomas that developed in the DWCNT treated rats is not relevant to humans.

CONCLUSIONS: Our results demonstrate that the DWCNT fibers we tested are biopersistent in the rat lung and induce chronic inflammation. Rats treated with 0.5 mg DWCNT developed pleural fibrosis and lung tumors. These findings demonstrate that the possibility that at least some types of DWCNTs are fibrogenic and tumorigenic cannot be ignored.

PMID:35449069 | DOI:10.1186/s12989-022-00469-8

Alzheimers Res Ther. 2022 Apr 21;14(1):57. doi: 10.1186/s13195-022-00998-6.

ABSTRACT

BACKGROUND: To evaluate a wide range of optical coherence tomography (OCT) parameters for possible application as a screening tool for cognitively healthy individuals at risk of Alzheimer’s disease (AD), assessing the potential relationship with established cerebrospinal fluid (CSF) core AD biomarkers and magnetic resonance imaging (MRI).

METHODS: We studied 99 participants from the Valdecilla Study for Memory and Brain Aging. This is a prospective cohort for multimodal biomarker discovery and validation that includes participants older than 55 years without dementia. Participants received a comprehensive neuropsychological battery and underwent structural 3-T brain MRI, lumbar puncture for CSF biomarkers (phosphorylated-181-Tau (pTau), total Tau (tTau), beta-amyloid 1-42 (Aβ 1-42), and beta-amyloid 1-40 (Aβ 1-40)). All individuals underwent OCT to measure the retinal ganglion cell layer (GCL), the retinal nerve fiber layer (RFNL), the Bruch’s membrane opening-minimum rim width (BMO-MRW), and choroidal thickness (CT). In the first stage, we performed a univariate analysis, using Student’s t-test. In the second stage, we performed a multivariate analysis including only those OCT parameters that discriminated at a nominal level, between positive/negative biomarkers in stage 1.

RESULTS: We found significant differences between the OCT measurements of pTau- and tTau-positive individuals compared with those who were negative for these markers, most notably that the GCL and the RNFL were thinner in the former. In stage 2, our dependent variables were the quantitative values of CSF markers and the hippocampal volume. The Aβ 1-42/40 ratio did not show a significant correlation with OCT measurements while the associations between pTau and tTau with GCL were statistically significant, especially in the temporal region of the macula. Besides, the multivariate analysis showed a significant correlation between hippocampal volume with GCL and RNFL. However, after false discovery rate correction, only the associations with hippocampal volume remained significant.

CONCLUSIONS: We found a significant correlation between Tau (pTau) and neurodegeneration biomarkers (tTau and hippocampus volume) with GCL degeneration and, to a lesser degree, with damage in RFNL. OCT analysis constitutes a non-invasive and unexpensive biomarker that allows the detection of neurodegeneration in cognitively asymptomatic individuals.

PMID:35449033 | DOI:10.1186/s13195-022-00998-6

Diabetol Metab Syndr. 2022 Apr 21;14(1):55. doi: 10.1186/s13098-022-00828-7.

ABSTRACT

BACKGROUND: Body mass index was intimately associated with islet function, which was affected by various confounding factors. Among all methods of statistical analysis, Mendelian randomization best ruled out bias to find the causal relationship. In the present study, we explored the relationship between 13 East Asian body mass index-related genes reported previously and islet function using the Mendelian randomization method.

METHODS: A total of 2892 participants residing in northern China were enrolled. Anthropological information, such as sex, age, drinking status, smoking status, weight, height and blood pressure, was recorded for all participants. Fasting glucose and insulin were detected, and the insulin sensitivity index was calculated. 13 single nucleotide polymorphismss in East Asian body mass index -related genes were analysed with the ABI7900HT system.

RESULTS: Five genetic locus mutations, CDKAL1, MAP2K5, BDNF, FTO and SEC16B, were found to be associated with body mass index and were used to estimate the genetic risk score. We found that the genetic risk score was negatively associated with the insulin sensitivity index. Even after adjusted of confounding factors, the relationship showed statistical significance. A subsequent interaction effect analysis suggested that the negative relationship between the genetic risk score and insulin sensitivity index no longer existed in the nondrinking population, and smokers had a stronger negative relationship than nonsmokers.

CONCLUSION: We found a negative causal relationship between body mass index-related genetic locus mutations and insulin resistance, which might be increased by acquired lifestyle factors, such as drinking and smoking status.

PMID:35449023 | DOI:10.1186/s13098-022-00828-7

BMC Oral Health. 2022 Apr 21;22(1):137. doi: 10.1186/s12903-022-02173-7.

ABSTRACT

BACKGROUND: 20-80% of adults presenting to a dental clinic experience anxiety. Negative past dental experiences and environmental factors such as the waiting area of a dental clinic or sound of a drill are commonly considered triggering factors for anxiety. Anxiety management strategies are considered a part of routine dental procedure, due to increased prevalence and compromised patient care. Hence the aim of the present study is to identify the prevalence and variables associated with dental anxiety and their management in patients visiting the primary care dental clinics in Bahrain.

METHOD: Four hundred and eighty participants were included. A 3-part questionnaire deciphered the demographic characteristics of the participants, the dental procedure undertaken, the level of anxiety, and the management strategy used by the dentist. The pre and post-treatment MDAS scores were recorded. Paired t test, ANOVA and Wilcoxon signed rank test was used to test the level of significance between the variables and the mean MDAS scores. The p ≤ 0.05 was considered statistically significant.

RESULTS: The prevalence of dental anxiety was 23.7% with moderate anxiety, and 11.4% with high anxiety. Females presented with a higher mean MDAS both pre and post-treatment compared with males. A statistically significant difference between the pre and post-treatment MDAS scores were observed in educated patients less than 50 years of age. Those with unpleasant previous dental experience showed statistically significant difference. Analyses of anxiety management techniques showed that single techniques worked better than combination techniques. Rest and breaks combined with any other technique of choice showed significant reduction in the MDAS scores post treatment.

CONCLUSION: To conclude, all patients attending the dental clinic present with some level of anxiety that necessitates the dentist to use anxiety management strategies. Non-pharmacological methods that are non-invasive must be the first choice. Rests and breaks, with any technique of choice provides the best possible anxiety management. It is possible to achieve the desired anxiety reduction in single visit to complete the planned dental intervention, other than in patients who are dental phobic.

PMID:35448999 | DOI:10.1186/s12903-022-02173-7

Health Qual Life Outcomes. 2022 Apr 21;20(1):67. doi: 10.1186/s12955-022-01973-3.

ABSTRACT

BACKGROUND: There are many methods available for measuring social support and quality of life (QoL) of adolescents, of these, the KIDSCREEN tools are most widely used. Thus, we aimed to translate and validate the KIDSCREEN-27 scale for the usage among adolescents aged between 10 and 19 years old in Slovenia.

METHODS: A cross-sectional study was conducted among 2852 adolescents in primary and secondary school from November 2019 to January 2020 in Slovenia. 6-steps method of validation was used to test psychometric properties of the KIDSCREEN-27 scale. We checked descriptive statistics, performed a Mokken scale analysis, parametric item response theory, factor analysis, classical test theory and total (sub)scale scores.

RESULTS: All five subscales of the KIDSCREEN-27 formed a unidimensional scale with good homogeneity and reliability. The confirmatory factor analysis showed poor fit in user model versus baseline model metrics (CFI = 0.847; TLI = 0.862) and good fit in root mean square error (RMSEA = 0.072; p(χ²) < 0.001). A scale reliability was calculated using Cronbach’s α (0.93), beta (0.86), G6 (0.95) and omega (0.93).

CONCLUSIONS: The questionnaire showed average psychometric properties and can be used among adolescents in Slovenia to find out about their quality of life. Further research is needed to explore why fit in user model metrics is poor.

PMID:35448993 | DOI:10.1186/s12955-022-01973-3

BMC Public Health. 2022 Apr 20;22(1):794. doi: 10.1186/s12889-022-13021-2.

ABSTRACT

BACKGROUND: Africa is the global region where modern-slavery is most prevalent, especially among women and girls. Despite the severe health consequences of human trafficking, evidence on the risks and experiences of trafficked adolescents and young women is scarce for the region. This paper addresses this gap by exploring the intersections between violence, migration and exploitation among girls and young women identified as trafficking survivors in Nigeria and Uganda.

METHODS: We conducted secondary analysis of the largest routine dataset on human trafficking survivors. We used descriptive statistics to report the experiences of female survivors younger than 25 years-old from Nigeria and Uganda. We also conducted 16 semi-structured interviews with adolescents identified as trafficked in both countries. We used thematic analysis to explore participants’ perceptions and experiences before, during and after the trafficking situation.

RESULTS: Young female survivors of human trafficking in Nigeria and Uganda are exposed to a range of experiences of violence before migration, during transit and at destination. The qualitative data revealed that children and adolescents migrated to escape family poverty, violence and neglect. They had very low levels of education and most had their studies interrupted before migrating. Family members and close social contacts were the most common intermediaries for their migration. During transit, sexual violence and hunger were common, especially among Nigerians. Participants in both the quantitative and qualitative studies reported high levels of violence, deception, coercion, withheld wages and poor working conditions at destination. The adolescents interviewed in the qualitative study reported severe mental suffering, including suicide attempts. Only one reported the prosecution of perpetrators.

CONCLUSIONS: Our findings suggest that interventions to prevent or mitigate the negative impact of adverse childhood experiences can contribute to preventing the trafficking of adolescents in Nigeria and Uganda. These interventions include social protection mechanisms, universal access to education, social service referrals and education of parents and carers. Importantly, effective prevention also needs to address the systemic conditions that makes trafficking of female adolescents invisible, profitable and inconsequential for perpetrators.

PMID:35448985 | DOI:10.1186/s12889-022-13021-2

BMC Neurol. 2022 Apr 21;22(1):149. doi: 10.1186/s12883-022-02646-w.

ABSTRACT

BACKGROUND: We do not yet know whether or the extent to which multimodal therapy changes the health behaviors and health service use of chronic headache patients in the long term. Associations are expected between pain symptoms and pain management abilities for patients who are categorized as successfully treated and those who remain unchanged.

METHODS: Routine longitudinal data of an enrolment period of five years from 101 headache patients treated with a two-week, full-day, semi-inpatient multimodal pain therapy at the Interdisciplinary Pain Center of the University Clinic Erlangen were available when therapy began and 12 months after treatment. To investigate long-term changes in health behavior and health service use as well as their associations with the outcome “reduction in pain days,” we used descriptive and inferential statistics (i.e., binary logistic regression).

RESULTS: Patients who underwent interdisciplinary treatment showed statistically significant changes in their health behavior in five areas. Twelve months after treatment, we found a significantly higher frequency of engagement in athletic sports (p < .001) as well as increases in the use of relaxation techniques (p < .001), TENS devices for relaxation purposes (p = .008), psychological coping strategies (p < .001), and mindfulness-based techniques for dealing with pain (p < .001). 52.8% of the sample reported a reduction in the number of pain days 12 months after treatment. Binary logistic regression (χ² (12) = 21.419; p = .045; R² = .255) revealed that a reduction in pain days 12 months after treatment was positively associated with regular physical activity in the form of muscle strengthening and stretching (athletic sports) (p = .012).

CONCLUSION: Chronic headache patients acquired long-term skills from an interdisciplinary treatment concerning the use of relaxation techniques, the use of psychological coping strategies, and physical activity in the form of athletic exercise. Of those, regular athletic exercise was positively associated with a smaller number of pain days in the long term. Thus, a physical activity module should be an element of interdisciplinary treatment for chronic headache patients.

PMID:35448981 | DOI:10.1186/s12883-022-02646-w

BMC Ophthalmol. 2022 Apr 21;22(1):182. doi: 10.1186/s12886-022-02393-z.

ABSTRACT

BACKGROUND: Virtual reality is being increasingly applied in vision therapy. However, the differences in effectiveness, optimal treatment cycle, and prognosis between virtual reality-based vision therapy and traditional therapies remain unknown. The purpose of this study was to compare the effectiveness of virtual reality-based vision therapy and office-based vergence/accommodative therapy in young adults with convergence insufficiency or accommodative dysfunction.

METHODS: The patients were randomly assigned to either the virtual reality-based vision therapy group or the office-based vergence/accommodative therapy group. The vision therapy lasted 12 weeks (1 h/week) in both groups. Binocular visual functions (vergence and accommodation) were measured and a subjective questionnaire-based assessment was performed at baseline and after 6 and 12 weeks of therapy.

RESULTS: In total, 33 patients with convergence insufficiency and 30 with accommodative dysfunction completed the study. After 12 weeks of treatment for convergence insufficiency, the Convergence Insufficiency Symptom Survey score (F_2,31 = 13.704, P < 0.001), near point of convergence (F_2,31 = 21.774, P < 0.001), positive fusional vergence (F_2,31 = 71.766, P < 0.001), and near horizontal phoria (F_2,31 = 16.482, P < 0.001) improved significantly in both groups. Moreover, the monocular accommodative amplitude (F_2,25 = 22.154, P < 0.001) and monocular accommodative facility (F_2,25 = 86.164, P < 0.001) improved significantly in both groups after 12 weeks of treatment. A statistically significant difference was observed in monocular accommodative facility (F_1,25 = 8.140, P = 0.009) between the two groups, but not in other vergence and accommodative functions (0.098 < P < 0.687).

CONCLUSION: Virtual reality-based vision therapy significantly improved binocular vision functions and symptoms in patients with convergence insufficiency and accommodative dysfunction, thereby suggesting its effectiveness as a new optional or additional treatment for young adults with these conditions.

TRIAL REGISTRATION: This study was registered at the Chinese Clinical Trials Registry on 16/04/2019 (identifier: ChiCTR1900022556 ).

PMID:35448970 | DOI:10.1186/s12886-022-02393-z

BMC Cardiovasc Disord. 2022 Apr 21;22(1):186. doi: 10.1186/s12872-022-02605-w.

ABSTRACT

BACKGROUND: Left ventricular structure and function abnormalities may be an early marker of cardiomyopathy among African Americans with diabetes (DM) even in the absence of coronary artery disease (CAD), arrhythmia, valvular heart disease and end-stage renal disease (ESRD). This study examined the association of prediabetes (PDM), DM and HbA1c with left ventricular structure and function among Jackson Heart Study (JHS) participants without traditional risk factors.

METHODS: Retrospective cross-sectional analyses of the association of PDM, DM and HbA1c with, left ventricular ejection fraction (LV EF), fractional shortening (LV FS), stroke volume index (SVI), cardiac index (CI), left ventricular end diastolic volume index (LVEDVI), left ventricular end systolic volume index (LVESVI), relative wall thickness (RWT), myocardial contraction fraction (MCF) and left ventricular mass index (LVMI). The study was conducted in 2234 adult JHS participants without preexisting CAD, arrhythmia, valvular heart disease or ESRD. Statistical analyses included descriptive, univariate and covariate adjusted linear regression analyses. Sensitivity analyses to explore the impact of hypertension on study outcomes were also carried out.

RESULTS: DM compared with no DM was associated with lower, SVI (- 0.96 ml/m², p = 0.029), LVEDVI (- 1.44 ml/m² p = 0.015), and MCF (- 1.90% p = 0.007) but higher CI (0.14 L/min/m², p < 0.001), RWT (0.01 cm, p = 0.002) and LVMI (2.29 g/m², p = 0.009). After further control for DM duration, only CI remaining significantly higher for DM compared with no DM participants (0.12 L/min/m², p = 0.009). PDM compared with no PDM was associated with lower, SVI (- 0.87 ml/m², P = 0.024), LVEDVI (- 1.15 ml/m² p = 0.003) and LVESVI (- 0.62 ml/m² p = 0.025). HbA1c ≥ 8.0% compared with HbA1c < 5.7% was associated with lower SVI (- 2.09 ml/m², p = 0.004), LVEDVI (- 2.11 ml/m² p = 0.032) and MCF (- 2.94% p = 0.011) but higher CI (0.11 L/min/m², p = 0.043) and RWT (0.01 cm, p = 0.035).

CONCLUSIONS: Glycemic status is associated with important left ventricular structure and function changes among African Americans without prior CAD, arrhythmia, valvular heart disease and ESRD. Longitudinal studies may further elucidate these relationships.

PMID:35448969 | DOI:10.1186/s12872-022-02605-w

BMC Microbiol. 2022 Apr 21;22(1):109. doi: 10.1186/s12866-022-02529-7.

ABSTRACT

BACKGROUND: Staphylococcus aureus is a notorious human pathogen that causes often lethal systemic conditions that are mostly medical device associated biofilm infections. Similarly, coagulase negative staphylococci are emerging as leading pathogen for nosocomial infections owing to their ability to form biofilm on implanted medical equipment. Chronic in nature, these infections are difficult to treat. Such recalcitrance of these infections is caused mainly due to the presence of persister cells, which exhibit transient yet extreme tolerance to antibiotics. Despite tremendous clinical significance, there is lack of studies on persister cells formation among clinical bacterial isolates. Considering the importance of factors influencing persister formation, in this study, we evaluate the association of antibiotic tolerance with biofilm production, antibiotic stress, growth phase, specimen type, and dependency on staphylococcal species. Biofilm formation was detected among 375 clinical staphylococcal isolates by quantitative tissue culture plate method (TCP) and icaAD genes by genotypic method. The antibiotic susceptibility was determined by Kirby Bauer disc diffusion method while minimum inhibitory concentration values were obtained by agar dilution method. Persister cells were measured in the susceptible staphylococcal isolates in the presence of clinically relevant antibiotics.

RESULTS: In the study, 161 (43%) S. aureus and 214 (57%) coagulase negative staphylococci (CNS) were isolated from different clinical samples. TCP method detected biofilm production in 84 (52.2%) S. aureus and 90 (42.1%) CNS isolates. The genotypic method detected icaAD genes in 86 (22.9%) isolates. Majority (> 90%) of both the biofilm producers and non-producers were sensitive to chloramphenicol and tetracycline but were resistant to penicillin. Interestingly, all isolates were sensitive to vancomycin irrespective of biofilm production. While high persister frequency was observed among all staphylococci isolates in the stationary growth phase, the persister frequency in exponential growth phase was statistically high among isolates possessing icaAD genes compared to icaAD negative isolates.

CONCLUSION: The research findings provide strong evidence that the clinical staphylococcal isolates exhibit extreme antibiotic tolerance suggesting their causal link with treatment failures. Understanding the factors influencing the formation and maintenance of persister cells are of utmost important aspect to design therapeutics and control recalcitrant bacterial infections.

PMID:35448965 | DOI:10.1186/s12866-022-02529-7