Global taxonomic, functional, and phylogenetic diversity of bees in apple orchards

An essential prerequisite to safeguard pollinator species is characterisation of the multifaceted diversity of crop pollinators and identification of the drivers of pollinator community changes across biogeographical gradients. The extent to which intensive agriculture is associated with the homogenisation of biological communities at large spatial scales remains poorly understood. In this study, we investigated diversity drivers for 644 bee species/morphospecies in 177 commercial apple orchards across 33 countries and four global biogeographical biomes. Our findings reveal significant taxonomic dissimilarity among biogeographical zones. Interestingly, despite this dissimilarity, species from different zones share similar higher-level phylogenetic groups and similar ecological and behavioural traits (i.e. functional traits), likely due to habitat filtering caused by perennial monoculture systems managed intensively for crop production. Honey bee species dominated orchard communities, while other managed/manageable and wild species were collected in lower numbers. Moreover, the presence of herbaceous, uncultivated open areas and organic management practices were associated with increased wild bee diversity. Overall, our study sheds light on the importance of large-scale analyses contributing to the emerging fields of functional and phylogenetic diversity, which can be related to ecosystem function to promote biodiversity as a key asset in agroecosystems in the face of global change pressures.

Improving the Performance of Paper-Based Dipole Antennas by Electromagnetic Flux Concentration

One of the essential issues in modern advanced materials science is to design and manufacture flexible devices, in particular in the framework of the Internet of Things (IoT), to improve integration into applications. An antenna is an essential component of wireless communication modules and, in addition to flexibility, compact dimensions, printability, low cost, and environmentally friendlier production strategies, also represent relevant functional challenges. Concerning the antenna's performance, the optimization of the reflection coefficient and maximum range remain the key goals. In this context, this work reports on screen-printed paper@Ag-based antennas and optimizes their functional properties, with improvements in the reflection coefficient (S₁₁) from -8 to -56 dB and maximum transmission range from 208 to 256 m, with the introduction of a PVA-Fe₃O₄@Ag magnetoactive layer into the antenna's structure. The incorporated magnetic nanostructures allow the optimization of the functional features of antennas with possible applications ranging from broadband arrays to portable wireless devices. In parallel, the use of printing technologies and sustainable materials represents a step toward more sustainable electronics.

The influence of simultaneous pancreas-kidney transplantation on the evolution of diabetic foot lesions and peripheral arterial disease

PURPOSE

Simultaneous pancreas-kidney transplantation (SPKT) remains the best treatment option in patients with type 1 diabetes and chronic kidney failure. There are only a few studies addressing the potential ischemic deterioration of peripheral arterial disease (PAD) due to blood diverting from the iliac artery to the kidney graft. We aimed to evaluate diabetic foot lesions and PAD evolution in SPKT recipients and investigate if they are more frequent in ipsilateral lower limb of kidney graft.

METHODS

We developed a retrospective cohort, including patients submitted to SPKT in our tertiary center, between 2000 and 2017. Diabetic foot lesions and PAD frequencies were compared in the period before and after transplantation.

RESULTS

Two hundred and eleven patients were included, 50.2% (n = 106) female, with a median age at transplantation of 35 years (IQR 9). After a median follow-up period of 10 years (IQR 7), patient, kidney, and pancreatic graft survival were 90.5% (n = 191), 83.4% (n = 176), and 74.9% (n = 158), respectively. Before transplant, 2.8% (n = 6) had PAD and 5.3% (n = 11) had history of foot lesions. In post-transplant period, 17.1% (n = 36) patients presented PAD and 25.6% (n = 54) developed diabetic foot ulcers, 47.6% (n = 35) of which in the ipsilateral and 53.3% (n = 40) in the contralateral lower limb of the kidney graft (p = 0.48). Nine patients (4.3%) underwent major lower limb amputation, 3 (30%) ipsilateral and 7 (70%) contralateral to the kidney graft (p = 0.29).

CONCLUSIONS

Diabetic foot lesions were not more frequent in the ipsilateral lower limb of the kidney graft, therefore downgrading the 'steal syndrome' role in these patients.

Particle Size, Mass Concentration, and Microbiota in Dental Aerosols

Many dental procedures are considered aerosol-generating procedures that may put the dental operator and patients at risk for cross-infection due to contamination from nasal secretions and saliva. This aerosol, depending on the size of the particles, may stay suspended in the air for hours. The primary objective of the study was to characterize the size and concentrations of particles emitted from 7 different dental procedures, as well as estimate the contribution of the nasal and salivary fluids of the patient to the microbiota in the emitted bioaerosol. This cross-sectional study was conducted in an open-concept dental clinic with multiple operators at the same time. Particle size characterization and mass and particle concentrations were done by using 2 direct reading instruments: Dust-Trak DRX (Model 8534) and optical particle sizer (Model 3330). Active bioaerosol sampling was done before and during procedures. Bayesian modeling (SourceTracker2) of long-reads of the 16S ribosomal DNA was used to estimate the contribution of the patients’ nasal and salivary fluids to the bioaerosol. Aerosols in most dental procedures were sub-PM₁ dominant. Orthodontic debonding and denture adjustment consistently demonstrated more particles in the PM₁, PM_2.5, PM₄, and PM₁₀ ranges. The microbiota in bioaerosol samples were significantly different from saliva and nasal samples in both membership and abundance (P < 0.05) but not different from preoperative ambient air samples. A median of 80.15% of operator exposure was attributable to sources other than the patients’ salivary or nasal fluids. Median operator’s exposure from patients’ fluids ranged from 1.45% to 2.75%. Corridor microbiota showed more patients’ nasal bioaerosols than oral bioaerosols. High-volume saliva ejector and saliva ejector were effective in reducing bioaerosol escape. Patient nasal and salivary fluids are minor contributors to the operator’s bioaerosol exposure, which has important implications for COVID-19. Control of bioaerosolization of nasal fluids warrants further investigation.

Dupilumab for atopic dermatitis: a real-world portuguese multicenter retrospective study

Introduction: Atopic dermatitis (AD) is a difficult-to-treat inflammatory skin disease with a high impact on patients' quality of life. Dupilumab, an IL-4 and IL-13 inhibitor, was the first monoclonal antibody approved for the treatment of moderate-to-severe AD and is currently approved in patients aged 6 or older.Methods: This is a nationwide, multicenter, retrospective, 48-week study designed by the Portuguese Group of AD to assess real-world efficacy and safety of dupilumab for the treatment of AD.Results: A total of 169 patients were enrolled, with a mean disease duration of 22.75 (±11.98) years. The percentage of patients achieving an improvement of at least 75% in Eczema Area and Severity Index (EASI) compared to baseline (EASI75 response) at weeks 12 and 48 was 67.6% and 74.1%, respectively. In the same timepoints, 25.0% and 44.1% achieved an EASI90 response. Patient-reported outcome measures also improved throughout the study period. Regarding safety, 32.0% of the patients developed adverse events, with conjunctivitis (26.6%), persistent facial erythema (4.7%), and arthritis/arthralgia (3.6%) as the more frequently reported.Conclusion: Data from real-world populations are crucial to guide clinicians in their daily decisions. This study provides data demonstrating that dupilumab is an effective and safe therapeutic option for AD.

Real-world comparison of different periprocedural antithrombotic strategies for atrial fibrillation catheter ablation

Introduction

Atrial Fibrillation (AF) catheter ablation carries high bleeding and thromboembolic risks, requiring a detailed assessment of overall risk-benefit profile regarding antithrombotic strategy. Vitamin K Anticoagulant (VKA) and Non-Vitamin K Antagonist Oral Anticoagulant (NOAC) have been used in the latest years in this setting, and with different interruption protocols periprocedural. Our goal was to evaluate the rate of acute adverse events (AAE) and compare them according to antithrombotic strategy used periprocedural, in a real-world basis.

Methods

A single-center retrospective study, including adult patients admitted to first AF catheter ablation, from 2004 to 2020. Different antithrombotic strategies (anticoagulation with VKA uninterrupted, anticoagulation with NOAC uninterrupted, no therapy or antiaggregation/interrupted ACO) were compared concerning the rate of any clinically relevant AAE; the composite of major AAE (hemopericardium and stroke/transient ischemic attack [TIA]) and minor AAE associated with vascular access. Descriptive statistics and logistic regression were used to compare groups according to the antithrombotic strategy with an alpha level of 0.05.

Results

Among the 868 patients included (mean age 59±12 yo, 67,5% [n=586] men), pulmonary vein isolation was performed under uninterrupted anticoagulation in 640 (73,7%), of which 595 patients with NOAC (68,5%) and 45 with VKA (5,2%). AF was paroxysmal, persistent and long-standing persistent in 63,4% (n=550), 21,4% (n=185) and 15,4% (n=133) patients, respectively. Mean CHADS-VASc score was 1,86±1,48. Over time there was a shift in the distribution of the type of antithrombotic therapy used, consistent with changes in recommendations (Graph 1).

The composite outcome occurred in 6,8% (n=62), including hemopericardium in 1,8% (n=16), stroke/TIA in 0,7% (n=6) and events related to vascular access in 1,4% (n=13) [Table 1]. No anticoagulation therapy or antiaggregation/interrupted ACO was more associated to the outcome, driven by major AAE, although the difference did not meet statistical significance (p=0,06) [Table 1]. No difference was found between VKA and NOAC group. Additionally, there was no diference in the incidence of hemorrhagic AAE since the implementation of an uninterrupted anticoagulation strategy periprocedural.

Conclusion

In our population of patients submitted to AF catheter ablation, an uninterrupted anticoagulation strategy is associated with lower rate of AAE, either with VKA or NOAC. Our real-world results are reassuring of the benefit of an uninterrupted strategy, and consistent with recent controlled trials.

Funding Acknowledgement

Type of funding sources: None. Antithrombotic therapies over timeClinically relevant acute adverse events

Is there a real difference in approach between women and men with non-ST-segment elevation myocardial infarction? Insights from a multicentre national registry

 

In patients with non-ST-elevation myocardial infarction (NSTEMI), the early invasive strategy has shown benefit in morbidity and mortality, especially in intermediate-to-high risk patients. However, women still seem to have a lower revascularization rate, regardless of the risk.

The aim of this study is to describe our clinical practice reality about the performance of the invasive strategy between genders among NSTEMI patients, in Portugal.

The authors performed a retrospective analysis of patients admitted with NSTEMI included in the Portuguese Registry on Acute Coronary Syndromes (ProACS) between October 2010 and February 2021. A propensity score matching included baseline characteristics and previous history was applied. Comparison tests and log-rank test were performed. A p-value less than 0.05 was considered statistically significant.

A total of 11858 patients with NSTEMI were included, of which 71.3% (n=8450) were men. After the propensity score performing, 4458 patients were analysed, 50.0% (n=2229) men. Table 1 shows the most important baseline characteristics.

The authors found a significant delay in hospital admission after the onset of symptoms in women (median of 6 hours and 48 minutes) compared to men (median of 5 hours) (p&lt;0.01). Grace score was higher in males (mean 153 points) than in females (mean 145 points) (p&lt;0.01).

The cardiac catheterization was performed in 82.9% (n=3695) of the patients, with no difference between genders (p-value=0.19), as shown in table 2. Among those who underwent cardiac catheterisation, the presence of significant stenosis and coronary occlusion was greater in males, for almost all localizations. The absence of obstructive coronary lesions was more common in females (p-value&lt;0.01).

During hospitalization, sustained ventricular tachycardia was more prevalent in males (p-value =0.01), with no significant difference for other complications or in-hospital mortality.

A 1-year follow-up of 2351 patients (1184 men and 1163 women) was analysed, with survival of 91.2% (n=1080) in men and 91.0% (n=1056) in women, with no significant difference (p-value=0.80).

In conclusion, we observed that women are admitted to the hospital later than men and have a lower Grace score at admission. However, the standardized analysis of the groups allows us to infer that the invasive strategy does not seem to be less frequent or late in women, as observed in other populations. A more recent analysis, including risk groups, would be interesting to clarify the results.

Funding Acknowledgement

Type of funding sources: None.

Unraveling the hepatoprotective effects of blueberries in a hypercaloric diet-induced rat model of prediabetes by metabolomic and transcriptomic approaches

Background

We previously described protective effects of blueberry juice (BJ) against hepatic steatosis evolution in a hypercaloric diet-induced rat model of prediabetes; however, the underlying mechanisms, are still scarcely explored. Herein, we aim to elucidate the molecular pathways underpinning BJ hepatoprotection on the dysmetabolism evolution in a rat model of prediabetes.

Methods

A rat model of evolutive prediabetes [Male Wistar rats, 8 weeks old] was developed by ingestion of a high-sucrose (HSu, 35%) diet for 9 weeks (W9), supplemented with a high-fat diet (HF, 60%) for further 14 weeks (HSuHF, W23), vs control with standard diet. Half of the animals (n = 10/group) daily received BJ (25g/Kg BW, orally) between W9 and W23. Along with metabolic characterization, BJ effects on serum and hepatic metabolic surrogates were elucidated using a 1H NMR based metabolomic approach. Moreover, the liver expression of genes (RT-PCR) involved in insulin signaling, lipid metabolism, inflammatory response and mitochondrial respiration was also explored. Values are means ± S.E.M (ANOVA followed by post-hoc tests).

Results

HSuHF+BJ rats restored hepatic levels of betaine and tend to recover the depletion of glutathione content found in HSuHF animals’ livers. Moreover, BJ positively affected the hepatic mRNA expression of key enzymes and mediators involved in fatty acid oxidation, insulin signalling, inflammatory response, as well as mitochondrial respiratory chain-related genes, which were all downregulated (P &lt; 0.05) in HSuHF animals’ livers.

Conclusions

Altogether, these molecular findings contribute to explain the mechanisms by which BJ elicits protection against hepatic steatosis and mitochondrial dysfunction induced by hypercaloric diets in the frame of prediabetes evolution.

Variations in heterochromatin content reveal important polymorphisms for studies of genetic improvement in garlic (Allium sativum L.)

Allium sativum L. is an herb of the Alliaceae family with a specific taste and aroma and medicinal and nutraceutical properties that are widely marketed in several countries. Brazil is one of the largest importers of garlic in the world, despite of its production is restricted and limited to internal consumption. Thus, explore the genetic diversity of commercial garlic conserved at germplasm banks is essential to generate additional genetic information about its economically important crop. A suitable tool for this purpose is the cytogenetic characterisation of these accessions. This study aimed to characterise the cytogenetic diversity among seven accessions of garlic from a Germplasm Bank in Brazil. The karyotypes were obtained by conventional staining and with chromomycin A3 (CMA) and 4,6-diamidino-2-phenylindole (DAPI) fluorochromes. All accessions analysed showed chromosome number 2n = 16, karyotype formula 6M+2SM, symmetrical karyotypes, reticulate interphase nuclei, and chromosomes with uniform chromatin condensation from prophase to metaphase. The fluorochromes staining showed differences in the amount and distribution of heterochromatin along the chromosomes and between accessions studied. Based on the distribution pattern of these small polymorphisms, it was possible to separate the seven accessions into three groups. It was also possible to differentiate some of the accessions individually. One of the results obtained showed a heteromorphic distension of the nucleolar organiser region observed on the chromosome pairs 6 or 7 with peculiar characteristics. It was suggested for example, that the heteromorphic block of heterochromatin (CMA+++/DAPI-) on chromosome 6 of the "Branco Mineiro Piauí" accession can be used as a marker to identify this genotype or may be associated with some character of economic interest.

Comparing single approaches success in index atrial fibrillation ablation

Funding Acknowledgements

Type of funding sources: None.

Introduction

Atrial Fibrillation (AF) ablation can be performed by inducing pulmonary vein electrical isolation. There are two widely used approaches: point-by-point and single-shot.  Catheter AF ablation is effective in restoring and maintaining sinus rhythm. However, efficacy is limited by high rate of AF recurrence, after an initially successful procedure.

Purpose

To evaluate AF index ablation successfulness using single-shot techniques and compare them to conventional one (point-by-point using irrigated- tip ablation catheter).

Methods

We analyzed, from a single center, all patients submitted to an index AF ablation procedure and its successfulness. The last was defined as AF, atrial tachycardia or flutter recurrence (with a duration superior to 30seconds) event- free survival, determined by holter and/or event recorder. These exams were performed after 6 and 12months and then annually, until 5years post procedure were accomplished.

Results

From November 2004 to November 2020, 821patients were submitted to first AF ablation (male patients 67,2%(N = 552), mean age of 59 ± 12years old). Paroxysmal AF(PAF) was present in 62,9%(N = 516), with short-duration persistent AF in 21,8%(N = 179) and long-standing persistent in 15,3%(N = 126). Ablation techniques were irrigated tip catheter point-by-point (PbP)ablation in 266 patients (32,4%) and single-shot (SS)techniques on the remaining 555(67,6%), including PVAC in 294(35,8%),225(27,4%) submitted to cryoablation and 36(4,4%) to nMARQ.

Globally, AF ablation had one-year success rate of 72,5%, and 56,2% at 3 years. A significant difference between AF duration type was found: Arrhythmic recurrence risk was 58% higher in persistent AF(PeAF) (HR 1.58;95%IC 1,22-2,04; p &lt; 0.001). In patients presenting with PAF prior to the procedure, success was significantly higher in those submitted to SS technique(HR:0.69;95%CI 0,47-0,90;p = 0.046), while those with PeAF had similar results.

Conclusion

In this single center analysis almost three-quarters had achieved one-year event-free survival, and more than a half reached long-term freedom from atrial arrhythmia. Patients with paroxysmal atrial fibrillation submitted to single-shot procedure presented with a higher success-rate. Moreover, our study confirmed previous data on the importance of atrial fibrillation classification to postprocedural outcomes. Abstract Figure. Survival Curves

An outbreak of infective endocarditis during the COVID-19 pandemic? - an observational retrospective single centre study

Funding Acknowledgements

Type of funding sources: None.

Infective endocarditis (IE) is described as an uncommon and challenging infective disease, due to its presentation variability. Its mortality remains high besides the better disease knowledge and therapeutic progress.

The aim of this study was to describe the clinical features and the incidence of IE. Furthermore, we try to identify the risk factors associated with early mortality.

A retrospective study was conducted and all patients diagnosed with definite or possible IE between January 2015 and June 2020, according to the modified Duke criteria, were included. Patient selection and information collection were obtained through medical records. Outcomes were in-hospital and 3 months after discharge mortality.

Group comparisons and multivariate logistic regression analysis were performed. A p-value less than 0.05 is statistically significant.

We analysed 51 patients, which 41 were admitted between 2015 and 2019 with a mean incidence of 8.2 cases per year. In 2020, 10 cases were diagnosed, corresponding to a percentual increase of 143.9%.

Of the 51 patients, 70.6% were male. The mean age was 65 years. Fever was the main presentation feature at admission. We counted 33.3% prosthetic valve endocarditis (PVE) and 5.9% IE device-related. The most common pathogens were Streptococcus gallolyticus (13.7%) and Streptococcus oralis (13.7%). 35 patients (68.6%) had local complications and 26 patients (51%) had systemic complications. One-third of the patients was referenced to surgical treatment. Overall in-hospital mortality was 19.6% and early mortality at 3 months was 27.5%.

In the univariate analysis, early mortality was higher in diabetes mellitus (DM) patients (p < 0.01) and in those who developed sepsis during hospitalization (p = 0.04). In multivariate logistic regression, only DM (OR = 15.8, 95% CI [3.2, 79.0]) was shown to be an independent factor of mortality.

The incidence of IE increased during the first semester of 2020, possibly due to the increased attention given to patients with fever. Diabetes mellitus was found to be the only independent predictor of mortality. More national multicentre studies are needed.

Intraventricular conduction defects in patients with st-segment elevation myocardial infarction – the paradox of right bundle branch block

 

Intraventricular conduction defects (IVCD) in patients with acute myocardial infarct (AMI) are predictors of a worse prognosis. When acquired they can be the result of an extensive myocardial damage.

Purpose

To assess the impact of IVCD, regardless of being previously known or presumed new, on in-hospital outcomes of patients with AMI with ST segment elevation (STEMI) or undetermined location.

Methods

From a series of patients included in the National Registry of Acute Coronary Syndrome between 10/1/2010 and 9/1/2019, were selected patients with STEMI or undetermined AMI, undergoing coronary angiography.

Results

7805 patients were included: 461 (5.9%) presenting left bundle branch block (LBBB), 374 (4.8%) with right bundle branch block (RBBB) and 6970 (89.3%) with no IVCD. Clinical characteristics as well as in-hospital outcomes are described in the table 1. An unexpected worse prognosis in patients with RBBB has motivated a multivariate analysis. RBBB remained an independent predictor of in-hospital mortality (OR 1.91, 95% CI 1.04–3.50, p=0.038), along with female gender (OR 1.73, 95% CI 1.11–2.68, p=0.015), Killip Class&gt;1 (OR 2.26, 95% CI 1.45–3.53, p&lt;0.001), left ventricular ejection fraction &lt;50% (OR 3.93, 95% CI 2.19–7.05, p&lt;0.001) and left anterior descending artery as the culprit lesion (OR 1.85, 95% CI 1.16–2.91, p=0.009).

Conclusion

In spite of an apparent better clinical profile, in the current large series of unselected STEMI patients, the presence of RBBB is associated with the worst in-hospital outcome. RBBB doubles the risk of death, being an independent predictor of in-hospital mortality.

Funding Acknowledgement

Type of funding source: None

Estimated Cancer Incidence and Mortality in Europe for the year 2020

Background

Up-to-date cancer burden indicators are essential to support political decision making, to enable epidemiological research and as an information source for citizens. Nevertheless, observed cancer incidence and mortality suffer from an endemic registration delay in the data production workflow. To overcome this, the European Commission's Joint Research Centre in collaboration with the WHO's International Agency for Research on Cancer have computed estimates of cancer incidence and mortality, for the year 2020 and for European countries, in the framework of the European Cancer Information System (ECIS).

Methods

Predicted values for the year 2020 are based on the incidence data of more than 150 European population-based cancer registries included in the ECIS, and on the WHO mortality database. According to previously developed and applied methodology, the estimates of 2020 cancer incidence and mortality rates were produced for 40 European countries, on the basis of the most recent time trends of observed data, where possible. Estimated rates were then applied to the projected 2020 population from EUROSTAT, to calculate the predicted number of new cases and deaths for 2020 in each European country.

Results

The number of new cancer cases and deaths in 2020 has been estimated per country by sex and age group, for 25 major cancer sites. The results are included and disseminated through the ECIS web application (https://ecis.jrc.ec.europa.eu/).

Conclusions

The release of up-to-date cancer incidence and mortality estimates is of crucial importance in supporting evidence-based EU cancer policies. The homogeneity of the estimation methods applied throughout Europe guarantees the comparability of the estimated values between countries. Reliable and comparable estimates enable highlighting differences between countries in cancer incidence and mortality, thus facilitating the identification of possible intervention areas.

Key messages

The EC’s JRC, in collaboration with WHO’s IARC, have computed estimates of cancer incidence and mortality for the year 2020 for European countries, in the framework of the ECIS. The number of new cancer cases and deaths in 2020 has been estimated in 40 European countries for 25 major cancer sites and included in the ECIS web application (https://ecis.jrc.ec.europa.eu/).

Burden of cancer and human exposure to chemicals

Cancer has important impacts on the EU's health systems and economies, with around 3 million new patients diagnosed each year. However, up to 40% of cancers are attributed to preventable causes. For these reasons, cancer is one of the main priorities of the EC in the health domain.

The new Europe's Beating Cancer Plan of the EC, to be launched at the end of 2020, aims to support EU Member States to improve cancer control and care, by proposing actions at every key stage of the disease: prevention (lifestyle, pollution, vaccination), diagnosis, treatment and survivorship. Reliable cancer statistics are essential to propel both epidemiological research and political decision making, and provide the supporting evidence to allow assessment of best practices in all those key stages. To this purpose, the European Cancer Information System (ECIS), built on European population-based cancer registries' data, provides the latest information on indicators that quantify the burden of cancer in Europe. It permits the exploration of geographical patterns and temporal trends of incidence, mortality and survival by granting access to harmonised and validated cancer incidence data.

Population-based cancer registries have been essential in many of the epidemiological studies that led to the identification of several carcinogens in the work place as well as those linked to certain lifestyle habits such as tobacco and alcohol consumption. However, In conditions of low exposure, the identification of cancer hazards has remained largely inconclusive, due to the unavailability of sufficient exposure data and appropriate models that can account for multiple exposures over extended periods.

The linkage between cancer registries data and administrative databases, biobanks, environmental data and extensive lifestyle questionnaires could help identifying or consolidate the available information on emerging carcinogens and populations at risk, thus allowing the development of preventable measures.

Left Ventricular Noncompaction: A Rare Cause of Effort Angina Unveiled During Left Heart Catheterization

Effort angina is an under-appreciated presentation of left ventricular non-compaction that frequently leads to a late diagnosis. Cardiac ventriculography can assist in this diagnosis.

P236 Pinball game over

Introduction

Transthoracic echocardiogram (TTE) is recommended for the diagnosis of acute pulmonary embolism (PTE) only in unstable patients, as it lacks specificity and sensitivity in stable ones. However, the rare documentation of intracavitary thrombus confirms the diagnosis and is associated with right ventricular dysfunction and high mortality, up to 42%.

We report a 69year-old female patient with history of hypertension and obesity, presenting at the emergency department with hypothermia (35º C), cyanosis, tiredness and breathless to minimal efforts. At examination she had no measurable blood pressure, low peripheral perfusion, tachycardia, tachypneia and no other abnormalities. Arterial blood gases on 10L/min facemask showed an uncompensated metabolic acidosis with pCO2 27mmHg, HCO3 12mmol/L, hyperlactacidemia and hypoxemia (pO2 57mmHg). Lab results had leucocytosis and neutrophilia, CRP 30mg/L, serum creatinine 2.53mg/dL, K+ 5.1mmol/L and high sensitivity troponin I 305pg/ml. Chest X-ray showed enlargement of the right chambers with a nodular image next to the right hila.

Although sepsis complicating acute pneumonia was firstly assumed and intravenous antibiotics and fluids were rapidly started; persistent hypoxemia with hypocapnia and tachycardia lead to the suspicion of acute PTE and workup proceeded in that direction. A TTE was primarily done because of the renal injury, showing a dilated right ventricle with flattening of the interventricular septum and a large, long, mobile mass in the right atria, protruding to the right ventricle, consistent with a thrombus. As the patient was no more hemodynamic unstable, prompt anticoagulation with low molecular weight heparin (LMWH) was initiated. Lately performed thoracic angio-CT with no contrast showed mild dilation of pulmonary artery and scintigraphy confirmed extensive perfusion defects of the left lung, preserving only posterobasal segment, with normal ventilation.

Additional study revealed a deep venous thrombosis of left popliteal and right gemelar veins and a heterozygosity for two polymorphisms of methyltethahdrofolate reductase enzyme

C677T and A1298C, clinically relevant in the context of patient’s hyperhomocysteinemia.

The patient recovered initially, with compression stockings and anticoagulation. A follow-up TTE showed no remaining intracavitary mass and no signs of right side overload. In the day after, the patient evolved with sudden refractory hypotension and signs of hypoperfusion with cardiorespiratory collapse and death.

Conclusion

The incidence of intracardiac thrombus in the right chambers in a patient with PTE is low (3-23%) and probably underestimated by the absence of early echocardiography in all patients. This case highlights the lability of the clinical evolution of these patients, even tough disappearance of the right atrium thrombus, which is in line with their high early mortality.

Abstract P236 Figure. Imaging study

Impact of breast cancer cells´ secretome on the brain metastatic niche remodeling

Brain metastases occur in approximately 10-20% of patients with metastatic breast cancer showing a very poor overall survival. Curiously, different molecular subtypes (that show specific gene expression signatures and differential prognostic significance) are associated with different risks for brain metastases development, suggesting that cancer cells harbor specific molecular programs that award them intrinsic advantages to survive in this specific foreign tissue. Emerging data has been revealing that biophysical and/or mechanical properties of the brain extracellular matrix (ECM), along with those of the brain resident cells, play a crucial role in creating the best conditions for survival, colonization and outgrowth of breast cancer cells in this distinct microenvironment. Although several reports show that cancer cells modulate metastatic niches way before they reach the target organ, few data exist for the brain metastatic niche. Indeed, little is known concerning how factors secreted by cancer cells activate brain resident cells and/or modify brain ECM biomechanical properties and how these modifications impact cells´ ability to metastasize the brain. The brain is a particular organ, protected by the blood brain barrier (BBB), and containing exclusive functional units and very special cell types. Additionally, it is the organ with the most singular ECM and biomechanical properties. Thus, this cancer cell-brain metastatic niche interaction must present distinct properties. Consequently, the search for putative molecular markers that modulate the brain pre-metastatic niche, thus promoting the successful metastatic homing of cancer cells, is urgently needed. In this review, we will discuss key aspects regarding breast cancer cells and the brain pre-metastatic niche paracrine communication that is crucial to initiate the metastatic cascade. We will focus on cancer cell`s secretome influence into the brain microenvironment, specifically on its impact on tissue mechanics and on brain resident cells as regulators of the pre-metastatic niche formation, ultimately promoting metastatic colonization.

Whitening Efficacy of Chewing Gum Containing Sodium Metaphosphate on Coffee Stain: Placebo-controlled, Double-blind In Situ Examination

This study aimed to evaluate the ability of chewing gum containing sodium metaphosphate (SMP) to remove coffee stains from enamel in situ. This was a double-blind (subjects, evaluators), parallel-group, crossover, randomized clinical trial with 30 healthy adult volunteers. Each participant held an appliance with a hydroxyapatite (HA) pellet on the lower lingual side of his or her mouth for two hours to allow pellicle formation. The appliances were subsequently immersed in coffee solution at 37°C for 48 hours. The color of the HA pellet before and after coffee immersion was measured using a spectrophotometer. The participant set the appliance and chewed two pieces of test gum, which contained 7.5 mg of SMP per piece, or control gum without SMP. Each cycle included five minutes of exposure to chewing gum, after which the appliances were placed in 100% relative humidity at room temperature for a 30-minute incubation. This cycle was repeated five times for each gum type. The color of the HA pellet was measured after each chewing cycle using the spectrophotometer. In addition, ΔE* values, which indicate the change in pellet color after each chewing cycle compared with after coffee immersion, were calculated. Data were analyzed using the paired t-test with Bonferroni adjustment to compare ΔE* values of control and test gum after each chewing cycle. The ΔE* values of test gum were significantly higher than those of control gum after all chewing cycles, excluding the first cycle (p<0.05). This finding indicates that test gum containing SMP was more effective at removing coffee stains from the HA pellet than control gum. We conclude that chewing gum containing SMP can effectively remove coffee stains from HA pellets. Thus, SMP is a promising agent to be further explored in tooth-cleaning studies.