Longitudinal outcomes of obeticholic acid therapy in ursodiol-nonresponsive primary biliary cholangitis: Stratifying the impact of add-on fibrates in real-world practice

BACKGROUND

Suboptimal response to ursodeoxycholic acid occurs in 40% of primary biliary cholangitis (PBC) patients, affecting survival. Achieving a deep response (normalisation of alkaline phosphatase [ALP] and bilirubin ≤0.6 upper limit of normal) improves survival. Yet, the long-term effectiveness of second-line treatments remains uncertain.

AIMS

To evaluate the long-term effectiveness of obeticholic acid (OCA) ± fibrates. Focusing on biochemical response (ALP ≤1.67 times the upper limit of normal, with a decrease of at least 15% from baseline and normal bilirubin levels), normalisation of ALP, deep response and biochemical remission (deep response plus aminotransferase normalisation).

METHODS

We conducted a longitudinal, observational, multicentre study involving ursodeoxyccholic acid non-responsive PBC patients (Paris-II criteria) from Spain and Portugal who received OCA ± fibrates.

RESULTS

Of 255 patients, median follow-up was 35.1 months (IQR: 20.2-53). The biochemical response in the whole cohort was 47.2%, 61.4% and 68.6% at 12, 24 and 36 months. GLOBE-PBC and 5-year UK-PBC scores improved (p < 0.001). Triple therapy (ursodeoxycholic acid plus OCA plus fibrates) had significantly higher response rates than dual therapy (p = 0.001), including ALP normalisation, deep response and biochemical remission (p < 0.001). In multivariate analysis, triple therapy remained independently associated with biochemical response (p = 0.024), alkaline phosphatase normalisation, deep response and biochemical remission (p < 0.001). Adverse effects occurred in 41.2% of cases, leading to 18.8% discontinuing OCA. Out of 55 patients with cirrhosis, 12 developed decompensation. All with baseline portal hypertension.

CONCLUSION

Triple therapy was superior in achieving therapeutic goals in UDCA-nonresponsive PBC. Decompensation was linked to pre-existing portal hypertension.

Polymorphisms and haplotypes of TOLLIP and MUC5B are associated with susceptibility and survival in patients with fibrotic hypersensitivity pneumonitis

INTRODUCTION AND OBJECTIVES

Hypersensitivity pneumonitis (HP) is an interstitial lung disease with diverse clinical features that can present a fibrotic phenotype similar to idiopathic pulmonary fibrosis (IPF) in genetically predisposed individuals. While several single nucleotide polymorphisms (SNPs) have been associated with IPF, the genetic factors contributing to fibrotic HP (fHP) remain poorly understood. This study investigated the association of MUC5B and TOLLIP variants with susceptibility, clinical presentation and survival in Portuguese patients with fHP.

MATERIAL AND METHODS

A case-control study was undertaken with 97 fHP patients and 112 controls. Six SNPs residing in the MUC5B and TOLLIP genes and their haplotypes were analyzed. Associations with risk, survival, and clinical, radiographic, and pathological features of fHP were probed through comparisons among patients and controls.

RESULTS

MUC5B rs35705950 and three neighboring TOLLIP variants (rs3750920, rs111521887, and rs5743894) were associated with increased susceptibility to fHP. Minor allele frequencies were greater among fHP patients than in controls (40.7% vs 12.1%, P<0.0001; 52.6% vs 40.2%, P = 0.011; 22.7% vs 13.4%, P = 0.013; and 23.2% vs 12.9%, P = 0.006, respectively). Haplotypes formed by these variants were also linked to fHP susceptibility. Moreover, carriers of a specific haplotype (G-T-G-C) had a significant decrease in survival (adjusted hazard ratio 6.92, 95% CI 1.73-27.64, P = 0.006). Additional associations were found between TOLLIP rs111521887 and rs5743894 variants and decreased lung function at baseline, and the MUC5B SNP and radiographic features, further highlighting the influence of genetic factors in fHP.

CONCLUSION

These findings suggest that TOLLIP and MUC5B variants and haplotypes may serve as valuable tools for risk assessment and prognosis in fibrotic hypersensitivity pneumonitis, potentially contributing to its patient stratification, and offer insights into the genetic factors influencing the clinical course of the condition.

Home administration of biological treatment in severe asthma in real-life experience: impact on asthma control and quality of life

Summary

Introduction. Several biological agents for the treatment of severe asthma have been approved for self-administration on an outpatient basis in the last years. However, data on the impact of home administration in outcomes such as asthma control and quality of life in real-life settings are sparse. Being this knowledge crucial for clinical practice, this study aimed to assess asthma control and quality of life in patients who transitioned from day hospital administration of biological therapy to home administration. Methods. A single-center prospective analysis of 33 patients treated with biologics for severe asthma, who switched from hospital to home treatment was performed. Asthma Control Test (ACT), Control of Allergic Rhinitis and Asthma Test (CARAT), Asthma Life Quality (ALQ) and the number of exacerbations were assessed 3 months before and 3 and 6 months after of home-use. Results. ACT and CARAT did not show statistical differences comparing to the baseline values (21.8 ± 2.7 and 23.8 ± 5.5) within 3 months (22.1 ± 2.4, p = 0.609; 23.2 ± 5.3, p = 0.572) or 6 months (23.4 ± 0.9, p = 0.553; 23.7 ± 6.2, p = 0.149) of home administration. Also, ALQ score did not show meaningful variations between baseline (9.5 ± 3.2) and after 3 months (11.2 ± 4.4, p = 0.275) and 6 months (10.3 ± 3.8, p = 0.209) of home-use. Regarding asthma exacerbations, we did not record a significant difference comparing to the baseline values of 3 months/patient exacerbations (0.2 ± 0.4) and after 3 months (0.2 ± 0.5, p = 0.786) or 6 months (0.2 ± 0.4, p = 1.000) of change in modality treatment. There was no cases of anaphylaxis or other serious adverse effects in those patients treated at home. Conclusions. Transition of day hospital administration of biologic treatment for severe asthma to home administration did not lead to any deterioration of asthma control or quality of life. Our results emphasized the efficacy and safety of home administration of biologic treatment and provide support on changing the paradigm of the administration of biological treatment in severe asthma.

Consumption of legumes in children from 3 to 6 years – evaluation of an intervention program

Introduction

Eating habits are a key aspect of a healthy lifestyle. This study focuses on the importance of consuming legumes - rich and accessible source of protein, and a healthy and sustainable option, in environmental terms - contributing to increment health literacy levels at the population level.

Objectives

To design, implement and evaluate a program to promote the consumption of legumes - Beans4Life. Specifically, to assess its impact on the knowledge and frequency of consumption of the eight legumes (beans, grain, peas, beans, beans, lentils, chickpeas and lupins).

Methods

Pre-test post-test analytical study, with three evaluation moments: 1) before the intervention; 2) after the intervention with the children and 3) after the intervention with the guardians (end of the intervention). Participants: 90 children from 3 to 6 years old (54.4% male) and their guardians. Instruments: questionnaire to assess knowledge and food preferences, questionnaire on eating habits and a questionnaire to evaluate sessions. The intervention had two components, the first with the children (4 food education sessions) and the second with the families (activities that facilitate the inclusion of recipes with legumes in the family's daily life).

Results

Before the intervention, the results obtained show low levels of knowledge and frequency of consumption of legumes, influencing low health literacy. Peas and beans are the best known legumes (81.1% and 55.6%) and also preferred (77.8% and 73.3%). The results obtained in the second and third assessments show that there was a significant increase (p &lt; 0.05) in the knowledge and frequency of consumption of most legumes.

Conclusions

The objectives initially proposed were achieved and it will be pertinent to continue the present study, with larger samples, in order to increase health literacy awareness and the consumption of this food group in childhood, and provide more robust results that help to clarify the relationships found.

HGG-55. An adolescent with a High-Grade Glioma: persuing a specific diagnosis

BACKGROUND: Recognizing the value of molecular parameters provides evidence with repercussions on diseases classification. CLINICAL CASE: A thirteen-year-old girl was admitted in coma at the Intensive Care Unit due to a hemorrhagic stroke. CT revealed an expansive left frontal lobe lesion with perilesional edema and compression signs by an extensive hematoma. She underwent an emergency decompressive craniotomy for hematoma drainage, and the lesion was biopsied. The subsequent MRI showed a large heterogeneous mass with a cystic component. A first subtotal resection of the lesion was performed considering the language area. The histopathological examination showed tumor cells organized in perivascular pseudorosettes around the central hyalinized thickened blood vessel throughout the tumor, a pattern typically encountered in astroblastoma. Immunochemistry stains revealed a positive reactivity for GFAP, Olig2, and synaptophysin. The molecular study found a BRAFV600E mutation and homozygous CDKN2A e CDKN2B deletions; no TERT amplification, BCORL1, nor MN1 gene rearrangements were identified. She completed six weeks of radiotherapy without neurological signs/symptoms. A new surgical intervention was done 12 weeks later due to a slight increase of residual lesion. The rapid growth and the presence of viable tumor cells justified the therapy with irinotecan and bevacizumab, with mild adverse effects. One year after diagnosis, the adolescent is clinically well, without neurologic deficits and the MRI without evidence of residue or tumor recurrence. DISCUSSION: We began therapy based on morphological diagnosis. Complete resection and radiotherapy proved to be beneficial as in other high-grade gliomas, but the value of other therapies is still unknown. The BRAF gene variant would allow treatment with dabrafenib (in association with trametinib) or vemurafenib; however, she presents molecular findings associated with poor prognosis (CDKN2A deletion) that may impair the effectiveness of these therapies. According to the new WHO classification, the absence of MN1 alterations precludes the diagnosis of astroblastoma.

Erythrocyte-derived liposomes for the treatment of inflammatory diseases

Effective and safe therapies to counteract persistent inflammation are necessary. We developed erythrocyte-derived liposomes (EDLs) with intrinsic anti-inflammatory activity. The EDLs were prepared using lipids extracted from erythrocyte membranes, which are rich in omega-3 fatty acids with several health benefits. Diclofenac, a widely used anti-inflammatory drug, was incorporated into EDLs in relevant therapeutic concentrations. The EDLs were also functionalized with folic acid to allow their active targeting of M1 macrophages, which are key players in inflammatory processes. In the presence of lipopolysaccharide (LPS)-stimulated macrophages, empty EDLs and EDLs incorporating diclofenac were able to reduce the levels of important pro-inflammatory cytokines, namely interleukin-6 (IL-6; ≈85% and 77%, respectively) and tumor necrosis factor-alpha (TNF-α; ≈64% and 72%, respectively). Strikingly, cytocompatible concentrations of EDLs presented similar effects to dexamethasone, a potent anti-inflammatory drug, in reducing IL-6 and TNF-α concentrations, demonstrating the EDLs potential to be used as bioactive carriers in the treatment of inflammatory diseases.

Self-perception of childrenś oral health by their parents

Background

Neglecting oral hygiene can lead to early tooth loss, pain, discomfort and, consequently, a great monetary investment to repair the damage caused in the stomatognathic system, whether of masticatory, phonetic or aesthetic origin. The aim of the present study consists in the characterization of oral health perception and oral hygiene habits of the children by their own parents and the creation of a scale to classify children's oral health perception by their parents.

Methods

A cross-sectional observational epidemiological study was performed. The population of this study was made up of 422 parents whose children are between five and eleven years of age and who attend schools in the districts of Viseu and Lisbon. The data collection was achieved through the application of a self-administered questionnaire in order to characterize the parentś perception of the oral health of their own children.

Results

Through the analysis of the questionnaires, 54.8% of the sample considered that their own children present inadequate oral health behaviors; 40.3% sufficient and only 4.8% consider that their children have good and adequate oral health behaviors. Regarding oral hygiene, most of the children did it one to five times a day, 44.7% took ‘2 minutes' to perform this activity, 70.3% did not use dental floss, 77.9% do not brush their teeth after lunch, 49.3% only use toothbrush for oral hygiene, 13.6% never went to the dentist, 26.9% are afraid, 38.1% have already suffered from toothache, 28.8% had gingival hemorrhage and 12.6% had gingival inflammation.

Conclusions

Oral health is a determining factor for a good quality of life. To this end, it is essential to implement oral health education and promotion strategies with all members of the household, in order to guarantee better oral health indexes in the community.

Key messages

Oral health literacy and knowledge is essential in order to improve oral health indexes in the community. The characterization of the oral health of children and adolescents is crucial to improve oral health behaviors and establish the correct oral health promotion programs.

Computational methods for 2D materials modelling

Materials with thickness ranging from a few nanometers to a single atomic layer present unprecedented opportunities to investigate new phases of matter constrained to the two-dimensional plane. Particle-particle Coulomb interaction is dramatically affected and shaped by the dimensionality reduction, driving well-established solid state theoretical approaches to their limit of applicability. Methodological developments in theoretical modelling and computational algorithms, in close interaction with experiments, led to the discovery of the extraordinary properties of two-dimensional materials, such as high carrier mobility, Dirac cone dispersion and bright exciton luminescence, and inspired new device design paradigms. This review aims to describe the computational techniques used to simulate and predict the optical, electronic and mechanical properties of two-dimensional materials, and to interpret experimental observations. In particular, we discuss in detail the particular challenges arising in the simulation of two-dimensional constrained fermions and quasiparticles, and we offer our perspective on the future directions in this field.

Aspergillus fumigatus and aspergillosis: From basics to clinics

The airborne fungus Aspergillus fumigatus poses a serious health threat to humans by causing numerous invasive infections and a notable mortality in humans, especially in immunocompromised patients. Mould-active azoles are the frontline therapeutics employed to treat aspergillosis. The global emergence of azole-resistant A. fumigatus isolates in clinic and environment, however, notoriously limits the therapeutic options of mould-active antifungals and potentially can be attributed to a mortality rate reaching up to 100 %. Although specific mutations in CYP 51A are the main cause of azole resistance, there is a new wave of azole-resistant isolates with wild-type CYP 51A genotype challenging the efficacy of the current diagnostic tools. Therefore, applications of whole-genome sequencing are increasingly gaining popularity to overcome such challenges. Prominent echinocandin tolerance, as well as liver and kidney toxicity posed by amphotericin B, necessitate a continuous quest for novel antifungal drugs to combat emerging azole-resistant A. fumigatus isolates. Animal models and the tools used for genetic engineering require further refinement to facilitate a better understanding about the resistance mechanisms, virulence, and immune reactions orchestrated against A. fumigatus. This review paper comprehensively discusses the current clinical challenges caused by A. fumigatus and provides insights on how to address them.

Prevalence of suicidal ideation among medical students at a university in Brazil

Introduction

Personal and environmental factors may contribute to psychological distress in medical students. As a result, they are more susceptible to suicidal ideation, a serious public health problem.

Objectives

Estimate the prevalence and recognize associated factors of Suicide Ideation and Suicide Attempt among medical students at the Federal University of Sergipe, Brazil.

Methods

A cross-sectional study was performed with randomly selected students between April and June 2019. A structured online questionnaire about sociodemographic characteristics, educational process, and the current psych emotional experiences, besides Beck Scale for Suicide Ideation (BSI), which detects the presence of suicidal ideation, were applied. Statistical evaluation was performed with descriptive analysis and logistic regression for the evaluation of multiple variables.

Results

The study included 133 students, with an average age of 22.9±3.5 and 51,9% were male. Among this sample, 27,1% had suicidal ideation. The frequency is higher in those students who family income <10 minimum wages (OR=3.47) and who were not satisfied with the course (OR=3.52). Furthermore, the frequency of suicide attempt was 15.8%. It was higher among those who claimed to use a doctor-prescribed psychopharmaceutical (OR=10.46) and who lost some discipline in the course (OR=8.17). Ideation and attempt were significantly associated (p<0.001).

Conclusions

Frequency of suicidal ideation was high, associated with dissatisfaction related to the educational process, as well as lower family income. History of attempted suicide was also frequent and associated with ideation. Intervention and prevention measures are required.

Prevalence and associated factors of common mental disorders among medical students at a university in Brazil

Introduction

Common Mental Disorders (CMD) are minor manifestations of depressive, anxious or somatoform symptoms, which do not fit the diagnostic criteria of the International Code of Diseases (ICD). In medical students, this panorama can generate even more repercussions given the complexity of the medical education process.

Objectives

Estimate the prevalence and recognize associated factors of CMD among medical at the Federal University of Sergipe, Brazil.

Methods

A cross-sectional study was performed with randomly selected students between April and June 2019. The Self Report Questionnaire (SRQ-20) were used, along with a questionnaire about socioeconomic and demographic characteristics, personal aspects and educational process, prepared by the authors and previously tested in a pilot study. Statistical evaluation of multiple variables was performed through backward stepwise logistic regression analysis.

Results

The study included 80 students, equivalent to 22.59% of the total population of the studied Campus. There was an age average of 23.2 years (± 4.12), mostly female (52.5%) and single individuals (35%). The prevalence of CMD was 50% and an association was observed with the following factors: feeling of dissatisfaction with the course (p = 0.034); consider their own academic performance poor or regular (p = 0.12); lack of physical activity (p = 0.043); being anxious when not using a cell phone (p = 0.007); and the retraction pattern in the face of conflict situations in their interpersonal relationships (p = 0.025).

Conclusions

Results suggest a high prevalence of CDM, associated mainly with the personal perspective about the educational process and personal habits.

Burnout syndrome among brazilian medical students under different educational models

Introduction

Medical students are exposed to many stressors which may contribute to the onset of Burnout Syndrome (BS). It consists of a triad of emotional exhaustion, cynicism and low professional efficacy. As a result, BS may reduce academic performance, quality of life and damage future professional life.

Objectives

Estimate the prevalence and recognize associated factors of BS among medical students from two different medical schools form the same Brazilian Public University with different teaching models: School 1, with a traditional model, and School 2, with Problem-Based Learning model.

Methods

A cross-sectional study was performed with randomly selected students between April and June 2019. A structured questionnaire on socio-demographic characteristics and the educational process in addition to The Maslach Burnout Inventory/Student Survey (MBI-SS) were used. Statistical evaluation of multiple variables was performed through backward stepwise logistic regression analysis.

Results

Study included 213 students, with an average age of 23±3.77, 50,2% were male and 62,5% belong to School 1. Among this sample, 21,6% of the students fit tridimensional criteria for BS. Burnout levels were higher in those people who rarely get emotional support they need in the course (OR=3,98, CI 95%, 1,75-9,06), who considered abandoning the course (OR= 2,88, CI 95% 1,29-6,43) and who consider their academic performance regular or weak (OR= 12,1, CI 95%, 4-36,5).

Conclusions

Results suggest a high prevalence of BS with factors associated with the psychosocial and educational sphere of medical students. In our research, the teaching model was not a factor associated with BS.

Performance assessment of 11 commercial serological tests for SARS-CoV-2 on hospitalised COVID-19 patients

BACKGROUND

Commercial availability of serological tests to evaluate immunoglobulins (Ig) targeting severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has grown exponentially since the start of the coronavirus disease 2019 (COVID-19) outbreak. Thorough validation of these tests is important before use as epidemiological tools to infer seroprevalence in specific populations and as diagnostic tools to complement molecular approaches (e.g., quantitative reverse transcription-polymerase chain reaction).

METHODS

Commercial serological tests from 11 suppliers were assayed side-by-side using 126 samples from SARS-CoV-2-infected inpatients and 36 from healthy and HIV-infected individuals.

RESULTS

The majority of the tests assayed have >95% specificity. For the sensitivity calculation, samples were stratified by days since symptoms onset; sensitivity peaks at 16-21 days for IgM and IgA (maximum 91.2%, Euroimmun) and, dependant on the test, at 16-21 or >21 days for IgG (maximum 94.1%, Snibe). Data from semiquantitative tests show that patients with a severe clinical presentation have lower levels of Ig targeting SARS-CoV-2 at <10 days since symptoms onset and higher levels at >21 days, compared to patients with a non-severe presentation.

CONCLUSIONS

This study highlights the heterogeneity of sensitivity and generally high specificity of the serological tests and establishes a basis for their usefulness to complement diagnostic techniques and population seroprevalence studies.

TREM1 regulates antifungal immune responses in invasive pulmonary aspergillosis

Pattern recognition receptors (PRRs) are responsible for Aspergillus fumigatus recognition by innate immunity and its subsequent immune signaling. The triggering receptor expressed on myeloid cells 1 (TREM1) is a recently characterized pro-inflammatory receptor constitutively expressed on the surface of neutrophils and macrophages. A soluble form (sTREM1) of this protein that can be detected in human body fluids has been identified. Here we investigated the role of TREM1 during invasive pulmonary aspergillosis (IPA). IPA patients displayed significantly higher levels of sTREM1 in bronchoalveolar lavages when compared to control patients. Functional analysis in TREM1 showed that the levels of sTREM1 and TREM1 pathway-related cytokines were influenced by single nucleotide polymorphisms in TREM1. In addition, we confirmed a role of TREM1 on antifungal host defense against A. fumigatus in a murine model of IPA. TREM1 deficiency increased susceptibility to infection in the immunosuppressed murine host. Deletion of TREM1 showed delayed innate and adaptive immune responses and impaired pro-inflammatory cytokine responses. The absence of TREM1 in primary macrophages attenuated the TLR signaling by altering the expression of both receptor and effector proteins that are critical to the response against A. fumigatus. In this study, and for the first time, we demonstrate the key role for the TREM1 receptor pathway during IPA.

Chest CT imaging features of COVID-19 pneumonia: First radiological insights from Porto, Portugal

INTRODUCTION

The outbreak of a highly infectious respiratory disease - COVID-19 - has spread globally and a novel type of coronavirus (SARS-CoV-2) was identified as its cause. Chest CT findings have been described as an aid for COVID-19 diagnosis and management. We aimed to describe the CT imaging characteristics in a group of COVID-19 patients while we also intended to assess if any of these radiological features were associated with short-term prognosis.

MATERIALS AND METHODS

CT examinations from 164 consecutive patients with at least one positive RT-PCR nucleic acid assay for SARS-CoV-2 were retrospectively analyzed. Numerous CT imaging features were recorded independently by two radiologists. Patients were grouped according to their status 14 days after the initial CT scan in either discharged/hospitalized in a non-ICU ward (favorable prognosis group) versus deceased/admitted to an intensive care unit (unfavorable prognosis group).

RESULTS

Ground-glass opacities (89.0 %) and consolidations (73.2 %) with multilobar involvement were the predominant imaging findings, while a nodular pattern (3.7 %) and cavitation (1.2 %) were uncommon. Mean age was higher in the mortality/ICU group. Ground-glass opacities and consolidations were dominant in both groups, but distribution pattern of abnormalities was different, being more often diffuse in the mortality/ICU group. Linear opacities and opacities that were rounded in shape were more frequently observed in the favorable prognosis group. CT severity index was significantly higher in the mortality/ICU group. For assessing unfavorable prognosis, the best cut-off for CT severity index was 24 (sensitivity 78 %; specificity 59 %). Interobserver agreement for all CT findings was excellent.

CONCLUSION

COVID-19 pneumonia in Porto, Portugal, manifests as multilobar ground-glass opacities and consolidations. Older age, diffuse distribution and increasing CT severity index are associated with worse short-term prognosis while linear opacities resembling organizing pneumonia and rounded opacities herald a more favorable prognosis.

Effects of single and combined exposures of gold (nano versus ionic form) and gemfibrozil in a liver organ culture of Sparus aurata

In vitro methods have gained rising importance in ecotoxicology due to ethical concerns. The aim of this study was to assess the single and combined in vitro effects of gold, as nanoparticle (AuNPs) and ionic (Au⁺) form, and the pharmaceutical gemfibrozil (GEM). Sparus aurata liver organ culture was exposed to gold (4 to 7200 μg·L^-1), GEM (1.5 to 15,000 μg·L^-1) and combination 80 μg·L^-1 gold +150 μg·L^-1 GEM for 24 h. Endpoints related with antioxidant status, peroxidative/genetic damage were assessed. AuNPs caused more effects than Au⁺, increasing catalase and glutathione reductase activities and damaging DNA and cellular membranes. Effects were dependent on AuNPs size, coating and concentration. GEM damaged DNA at an environmentally relevant concentration, 1.5 μg·L^-1. Overall, the effects of the combined exposures were higher than the predicted, based on single exposures. This study showed that liver culture can be a useful model to study contaminants effects.

Chronic skin disease and levels of physical activity in 17 777 Spanish adults: a cross-sectional study

BACKGROUND

To date there is limited literature on the prevalence of chronic skin conditions and its association with levels of physical activity (PA) in Spain.

AIM

To determine the prevalence of chronic skin disease and to compare levels of PA between people with and without chronic skin disease in a large representative sample of Spanish adults aged 15-69 years.

METHODS

Data from the Spanish National Health Survey 2017 were analysed. Chronic skin disease was assessed using a yes/no question. PA was measured using the short form of the International Physical Activity Questionnaire. Total PA metabolic equivalent of task min/week were calculated, and PA was included in the analyses as a continuous and a five-category variable.

RESULTS

This cross-sectional study included 17 777 adult participants (52.0% women; mean ± SD age 45.8 ± 14.1 years), of whom 940 (5.3%) had chronic skin disease. After adjusting for several potential confounders, there was a negative association between chronic skin disease and PA (OR = 0.87, 95% CI 0.76-1.00, P = 0.05), which was significant for men (OR = 0.76, 95% CI 0.62-0.93, P = 0.01) but not for women (OR = 0.97, 95% CI 0.81-1.16, P = 0.72).

CONCLUSIONS

In this large representative sample of Spanish adults, the prevalence of chronic skin disease was low. Levels of PA were lower in men with than in men without chronic skin conditions, but this association was not seen in women.

ADHEAR in Conductive Hearing Loss: a case study

Introduction Bone conduction hearing systems can be applied through non-invasive devices, using soft bands that exert pressure on the skin, or they can be surgically implanted (Bone Anchored Hearing Aid - BAHA). However, these bone conduction devices are frequently not well accepted due to the pressure on the head. Therefore, a new non-surgical hearing system was developed not to exert pressure on the skin, the ADHEAR. The bone anchorage in ADHEAR is performed through an adhesive adapter and is indicated for patients with conductive hearing loss and normal inner ear function.

Objectives Evaluate the audiological performance with the adhesive bone conduction hearing device (ADHEAR) in a patient with conductive hearing loss.

Methodology The study was designed as a prospective single-subject repeated-measure study with the subject serving as his own control. A 29 year old female patient who had a primary surgery due to middle ear cholesteatoma, was adapted with unilateral non-invasive adhesive bone conduction system for the treatment of conductive hearing loss. Air and bone conduction thresholds, word recognition scores (WRS) and speech recognition thresholds (SRT) in quiet and noise were assessed to verify the inclusion criteria of the study. Aided and unaided pure tone audiometry at 0.5, 1, 2 and 4 kHz in free field and speech audiometry in quiet and noise were performed at baseline and after 4 weeks with the ADHEAR.

Results The functional gain with the ADHEAR averaged over 0.5, 1, 2, and 4 kHz after 4 weeks of usage of the adhesive hearing system, improved from 55 dB HL to 31dB HL. Speech perception in quiet and noise improved significantly in the aided situation, with SRT in quiet improving from 60 to 35 dB HL, when compared to the unaided condition. Similar results were found in noise. The patient evaluated the ADHEAR system as being useful, and without complaints of skin pressure. There was no adverse skin reaction.

Conclusion Hearing performance was significantly better with ADHEAR under all test conditions. Therefore, this transcutaneous hearing system seems to be an excellent alternative for patients who need a hearing solution for conductive hearing loss but for clinical reasons cannot undergo surgery or conventional hearing aids. Furthermore, it preserves skin over the mastoid and reduces the risk of infection. Otherwise it has benefits verified by absence of head pressure and improvement of patient’s quality of life.

AB0561 AUTOMATIC QUANTIFICATION OF INTERSTITIAL LUNG DISEASE FROM CHEST COMPUTED TOMOGRAPHY IN SYSTEMIC SCLERODERMA

Background:

Scleroderma-associated interstitial lung disease (SSc-ILD) is often observed in patients with systemic scleroderma (SSc) and its diagnosis contributes to early treatment decisions1,2.

Objectives:

The present study aims to automatically quantify SSc-ILD from high-resolution chest-computed tomography (HRCT) and to evaluate the association between interstitial lung disease (ILD) extension and lung function impairment.

Methods:

Ninety-four patients with SSc and 27 lung-healthy subjects matched for gender, weight, height, and age underwent HRCT, spirometry and carbon monoxide diffusion capacity (DLCO). SSc-ILD was determined as the tissue mass present between -500 and +100 Hounsfield Units normalized by the total lung tissue mass (TLM). Cut off was the highest value obtained in the control group (25% of TLM). All data are presented as mean and standard deviations (Table I). An ANOVA test followed by Bonferroni post-hoc correction was used for comparisons among groups.

Results:

From 94 patients with SSc, 64 were classified as having pulmonary involvement (SSc-ILD) and 30 as not having pulmonary involvement (SSc No-ILD). In SSc-ILD subjects, there was a significant reduction in forced vital capacity (FVC), carbon monoxide diffusion capacity (DLCO) and carbon monoxide diffusion capacity normalized by alveolar ventilation (DLCO/A) when compared with SSc No-ILD and control group.

Conclusion:

The proposed method allows the automatic quantification of SSc-ILD from HRCT and ILD extent is associated with pulmonary function impairment.

References:

[1]Doyle TJ, Dellaripa PF. Lung Manifestations in the Rheumatic Diseases. CHEST. 2017 Dec;152(6):1283–95.

[2]Saketkoo LA, Magnus JH, Doyle MK. The primary care physician in the early diagnosis of systemic sclerosis: the cornerstone of recognition and hope. The American Journal of the Medical Sciences. 2014 Jan;347(1):54–63.

Table 1.

Demographic variables, pulmonary function tests and densitovolumetry considering scleroderma patients with less or greater pulmonary involvement.

Control GroupN = 27SSc No-ILDN = 30SSc-ILDN = 64p-valueDemographic DataFemales16 (59.2)28 (93.3)58 (90.1)-Age (years)37.9 ± 14.851.2 ± 12.256 ± 14<0.011a,bBMI (kg/m2)26.7 ± 5.124.1 ± 5.025.9 ± 5.7-Lung Function FVC (% predicted)100.2 ± 9.299.9 ± 19.869.8 ± 16.7<0.001b,c DLco (% predicted)103 ± 13.383.8 ± 14.263.4 ± 20.3<0.002a,b,cDLco/A (% predicted)112.7 ± 17.485.7 ± 12.979.2 ± 20.6<0.001a,bDensitovolumetryTLV mL4675 ± 9864471 ± 9163492 ± 1120<0.001b,cLung Tissue Mass (g)793 ± 125756 ± 159731 ± 155- ILD Extent (% LTM)17 ± 222.9 ± 1.232.6 ± 8<0.003a,b,c

a: Statistically significant difference between No-ILD SSc and control group; b and c: Statistically significant difference between SSc-ILD vs control group and SSc No-ILD, respectively.

Disclosure of Interests:

None declared

Effects of gold nanoparticles in gilthead seabream-A proteomic approach

Despite the widespread use of nanoparticles (NPs), there are still major gaps of knowledge regarding the impact of nanomaterials in the environment and aquatic animals. The present work aimed to study the effects of 7 and 40 nm gold nanoparticles (AuNPs) - citrate and polyvinylpyrrolidone (PVP) coated - on the liver proteome of the estuarine/marine fish gilthead seabream (Sparus aurata). After 96 h, exposure to AuNP elicited alterations on the abundance of 26 proteins, when compared to the control group. AuNPs differentially affected several metabolic pathways in S. aurata liver cells. Among the affected proteins were those related to cytoskeleton and cell structure, gluconeogenesis, amino acids metabolism and several processes related to protein activity (protein synthesis, catabolism, folding and transport). The increased abundance of proteins associated with energy metabolism (ATP synthase subunit beta), stress response (94 kDa glucose-regulated protein) and cytoskeleton structure (actins and tubulins) may represent the first signs of cellular oxidative stress induced by AuNPs. Although higher gold accumulation was found in the liver of S. aurata exposed to 7 nm PVP-AuNPs, the 7 nm cAuNPs were more bioactive, inducing more effects in liver proteome. Gold accumulated more in the spleen than in the other assessed tissues of S. aurata exposed to AuNPs, highlighting its potential role on the elimination of these NPs.

Contribuição à identificação de compostos purínicos e pirimidínicos de interesse biológico

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Micropatterned Silica Films with Nanohydroxyapatite for Y-TZP Implants

This investigation aimed at developing micropatterned silica thin films (MSTFs) containing nanohydroxyapatite (nano-HA) microaggregates that were not completely covered by silica so that they could directly interact with the surrounding cells. The objectives were 1) to evaluate the effect of the presence of 2 films (MSTF with or without nano-HA addition) on the characteristic strength (σ₀) and Weibull modulus ( m) of a yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and 2) to evaluate the effect of these 2 films, as applied onto the Y-TZP surface, on the morphology, orientation, and proliferation of MG63 cells. Sol-gel process and soft lithography were used to apply the MSTF onto the Y-TZP specimens. Three experimental groups were produced: Y-TZP, Y-TZP + MSTF, and Y-TZP + MSTF + sprayed nano-HA. All surfaces were characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy and tested for 4-point flexural strength ( n = 30) in water at 37 °C. Weibull analysis was used to determine m and σ₀ (maximum likelihood method). In vitro biological behavior was performed with human osteoblast-like cells (MG63). Y-TZP was successfully coated with MSFT and MSFT + nano-HA. Scanning electron microscopy micrographs indicated that the microaggregates of nano-HA were not entirely covered by the silica. There was no statistically significant difference among the experimental groups for σ₀ and m. In the groups containing the films, the cells were elongated and aligned along the lines. The MSFT + nano-HA group showed significantly higher cell metabolic activity than that obtained for the Y-TZP group at day 7. This investigation was successful in producing an MSTF containing nano-HA microaggregates that remained exposed to the environment. The developed films did not jeopardize the structural reliability of a commercial Y-TZP, as confirmed by the Weibull statistics. The MG63 cells seeded over the films became elongated and aligned along the films' micropatterned lines. Y-TZP specimens coated with MSTF and nano-HA showed a higher cell metabolic activity and proliferation after 7 d of culture when compared with uncoated Y-TZP.

Severe asthma in obese patients: Improvement of lung function after treatment with omalizumab

INTRODUCTION

Asthma and obesity have a considerable impact on public health and their prevalence is increasing. Obesity is a known risk factor for asthma and can make it more difficult to control. Omalizumab is recommended in patients with severe allergic persistent asthma. The aim of this study was to assess the impact of omalizumab treatment in obese asthmatic patients with poorly controlled severe persistent asthma.

METHODOLOGY

A non-interventional, prospective study was conducted, in an outpatient asthma clinic. All patients with severe asthma who started treatment with omalizumab were included and followed over 12 months. The study population was divided into two groups (obese and non-obese) for statistical analysis (descriptive and comparative analysis).

RESULTS

Thirty-two patients (19 obese) were followed. After 12 months of omalizumab treatment, there was a statistically significant improvement in body mass index, number of exacerbations in the previous year, rescue medication, disease control and lung function, in the whole population. At the end of the study obese patients had a significantly better lung function (FEV₁) than non-obese.

DISCUSSION

As described in the literature, there was a significant reduction in the number of exacerbations in the previous year, rescue medication and better disease control, in the whole population. In relation to lung function, about which published data are inconsistent, treatment with omalizumab significantly improved it in obese patients.

CONCLUSION

Our study showed that omalizumab significantly improved asthma control, reduced rescue medication and asthma exacerbations in all the population; and for the first time showed that obese patients achieved significantly improved lung function.

Adsorption of H2, O2, H2O, OH and H on monolayer MoS2

Hydrogen and hydrogen-containing gases are commonly used as reductants in chemical vapor deposition growth of MoS₂. Here, we consider the defects resulting from the presence of hydrogen during growth and the resulting electronically active defects. In particular, we find that the interstitial hydrogen defect is a negative-U center with amphoteric donor and acceptor properties. Additionally, we consider the effects of interaction with water and oxygen. The defects are analysed using density functional theory calculations.

Characterization of gelatin and chitosan scaffolds cross-linked by addition of dialdehyde starch

In this study the influence of the addition of dialdehyde starch on the properties of scaffolds based on gelatin and chitosan obtained by the freeze-drying method was investigated. In addition, the adhesion and proliferation of human osteosarcoma SaOS-2 cells on the obtained scaffolds was examined. Chitosan and gelatin were mixed in different weight ratios (75/25, 50/50, 25/75) with 1, 2 and 5 wt% addition of dialdehyde starch. The obtained scaffolds were subjected to mechanical testing, infrared spectroscopy, swelling measurements, low-pressure porosimetry and zeta potential measurement. Internal material structures were observed by scanning electron microscopy. The results showed that the cross-linking process occurred after the addition of dialdehyde starch and resulted in increased mechanical strength, swelling properties, zeta potential and porosity of studied materials. The attachment of SaOS-2 cells to all modified materials was better compared to an unmodified control and the proliferation of these cells was markedly increased on modified scaffolds.

Effects of doxorubicin administration on bone strength and quality in sedentary and physically active Wistar rats

Doxorubicin (DOX) is used in pediatric cancer treatment. This study assessed the effects of 7 weeks of DOX and 10-week recovery on bone quality and biomechanical properties in sedentary and exercised Wistar rats. DOX decreases femur diaphysis radial growth and biomechanical properties. Some of these DOX effects were aggravated by exercise.

INTRODUCTION

Bone growth in pre-pubertal years critically influences adult fracture risk. DOX is widely used in the treatment of pediatric cancers, but there is limited evidence on its potential negative effects on bone growth. Exercise improves bone growth in children, but there is no evidence if it protects against DOX-induced bone toxicity. This study investigates the early and intermediate effects of a 7-week course of DOX on bone histomorphometry and strength in sedentary and exercised growing animal models.

METHODS

Sixty-eight male Wistar rats (8 weeks) were treated with DOX (2 mg kg^-1) or vehicle for 7 weeks and afterward housed in standard cages or in cages with a running wheel and killed 2 or 10 weeks after last DOX administration. Femurs and blood were collected for assaying geometry, trabecular microarchitecture (histology), biomechanical properties (three-point bending and shearing of the femoral neck), bone calcium content and density (atomic absorption spectroscopy), and bone turnover markers (ELISA).

RESULTS

DOX treatment reduced the femur diaphysis radial growth, with DOX-treated animals having a lower tissue area, cortical area, cortical thickness, and moment of inertia. DOX also decreased distal femur trabecular bone volume and trabecular number and increased trabecular separation. Femur diaphysis stiffness and maximum load were also reduced in past DOX-treated animals. Exercise was shown to worsen the effects of past DOX treatment on the femur diaphysis mechanical properties.

CONCLUSION

DOX negatively affects bone geometry, trabecular microarchitecture, and femur mechanical properties in growing Wistar rats. Exercise further aggravates the detrimental effects of past DOX treatment on bone mechanical properties.