Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions

This Letter presents the measurement of near-side associated per-trigger yields, denoted ridge yields, from the analysis of angular correlations of charged hadrons in proton-proton collisions at sqrt[s]=13  TeV. Long-range ridge yields are extracted for pairs of charged particles with a pseudorapidity difference of 1.4<|Δη|<1.8 and a transverse momentum of 1 Collapse

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First Measurement of the |t| Dependence of Incoherent J/ψ Photonuclear Production

The first measurement of the cross section for incoherent photonuclear production of J/ψ vector mesons as a function of the Mandelstam |t| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |y|<0.8, using ultraperipheral collisions of Pb nuclei at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02  TeV. This rapidity interval corresponds to a Bjorken-x range (0.3-1.4)×10^{-3}. Cross sections are given in five |t| intervals in the range 0.04<|t|<1  GeV^{2} and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |t| dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.

Azithromycin Induced Asthma Remission in Adults With Persistent Uncontrolled Asthma: A Secondary Analysis of a Randomized, Double-Blind, Placebo-Controlled Trial

BACKGROUND

Asthma remission is a potential treatment goal.

RESEARCH QUESTION

Does adding azithromycin to standard therapy in patients with persistent uncontrolled asthma induce remission compared with placebo?

STUDY DESIGN AND METHODS

This secondary analysis used data from the AMAZES clinical trial-a double-blind placebo-controlled trial that evaluated the safety and efficacy of azithromycin on asthma exacerbations. The primary remission definition (referred to as clinical remission) was zero exacerbations and zero oral corticosteroids during the previous 6 months evaluated at 12 months and a 5-item Asthma Control Questionnaire score ≤ 1 at 12 months. Secondary remission definitions included clinical remission plus lung function criteria (postbronchodilator FEV1 ≥ 80% or postbronchodilator FEV1 ≤ 5% decline from baseline) and complete remission (sputum eosinophil count < 3% plus the aforementioned criteria). Sensitivity analyses explored the robustness of primary and secondary remission definitions. The predictors of clinical remission were identified.

RESULTS

A total of 335 participants (41.5% male; median age, 61.01 years; quartile 1-3, 51.03-68.73) who completed the 12-month treatment period were included in the analysis. Twelve months of treatment with azithromycin induced asthma remission in a subgroup of patients, and a significantly higher proportion in the azithromycin arm achieved both clinical remission (50.6% vs 38.9%; P = .032) and clinical remission plus lung function criteria (50.8% vs 37.1%; P = .029) compared with placebo, respectively. In addition, a higher proportion of the azithromycin group achieved complete remission (23% vs 13.7%; P = .058). Sensitivity analyses supported these findings. Baseline factors (eg, better asthma-related quality of life, absence of oral corticosteroid burst in the previous year) predicted the odds of achieving clinical remission. Azithromycin induced remission in both eosinophilic and noneosinophilic asthma.

INTERPRETATION

Adults with persistent symptomatic asthma achieved a higher remission rate when treated with azithromycin. Remission on treatment may be an achievable treatment target in moderate/severe asthma, and future studies should consider remission as an outcome measure.

Music therapy for supporting informal carers of adults with life-threatening illness pre- and post-bereavement; a mixed-methods systematic review

BACKGROUND

Music therapy interventions with informal carers of individuals with life-threatening illness at pre- and post-bereavement is an increasingly important clinical area. This systematic review is the first to synthesise and critically evaluate the international evidence associated with music therapy with adult informal carers pre- and post-bereavement. Specifically, the objectives were: i) to describe the characteristics and effectiveness of music therapy interventions which aim to improve health-related outcomes for adult informal carers of adults with life-threatening illness (pre- and post-bereavement), and ii) to describe the experience of music therapy for adult informal carers of adults with life-threatening illness (pre- and post-bereavement).

METHODS

Eligibility: adult informal carers of adults at end of life or bereaved; music therapy interventions for improving health-related outcomes; qualitative; mixed-method; and quantitative studies including comparators of any other intervention; published in English from 1998 onwards. Six databases were searched up to July 2022. A JBI mixed-methods systematic review approach was followed throughout, including quality appraisal, data extraction and a convergent segregated approach to synthesis and integration.

RESULTS

A total of 34 studies were included, published between 2003 and 2022. Most were conducted in North America (n = 13), Australia (n = 10), or Europe (n = 8). No studies were conducted in low- and middle-income countries or in the UK. The majority were qualitative (n = 17), followed by quasi-experimental (n = 8), mixed-methods (n = 7) and two RCTs. The majority focused on carers of individuals with dementia (n = 21) or advanced cancer (n = 7). Seventeen studies were purely quantitative or included a quantitative component. During meta-synthesis, findings were aligned to core outcomes for evaluating bereavement interventions in palliative care and previously identified risk factors for complicated grief. Commonly targeted outcomes in quantitative studies included quality of life and mental wellbeing, showing equivocal effectiveness of music therapy with significant and non-significant results. Twenty-two studies either purely qualitative or with a qualitative component underwent meta synthesis and suggested a diverse range of improved pre- and post-bereavement outcomes for informal carers across all core outcomes, and across all risk and protective factors, including psychological, spiritual, emotional, and social outcomes.

CONCLUSIONS

Qualitative studies provide moderate to strong evidence for improved health-related outcomes for adult informal carers of adults with life-threatening illness pre-bereavement. Limited studies including those bereaved negates conclusions for the bereavement phase. Comparisons and explanations for effectiveness across quantitative and qualitative studies are equivocal, with a high risk of bias and small samples in the limited number of quantitative studies, demonstrating a need for high-quality RCTs.

SYSTEMATIC REVIEW PRE-REGISTRATION

PROSPERO [CRD42021244859].

Biologics (mepolizumab and omalizumab) induced remission in severe asthma patients

BACKGROUND

Asthma remission has emerged as a potential treatment goal. This study evaluated the effectiveness of two biologics (mepolizumab/omalizumab) in achieving asthma remission.

METHODS

This observational study included 453 severe asthma patients (41% male; mean age ± SD 55.7 ± 14.7 years) from two real-world drug registries: the Australian Mepolizumab Registry and the Australian Xolair Registry. The composite outcome clinical remission was defined as zero exacerbations and zero oral corticosteroids during the previous 6 months assessed at 12 months and 5-item Asthma Control Questionnaire (ACQ-5) ≤1 at 12 months. We also assessed clinical remission plus optimization (post-bronchodilator FEV1 ≥80%) or stabilization (post-bronchodilator FEV1 not greater than 5% decline from baseline) of lung function at 12 months. Sensitivity analyses explored various cut-offs of ACQ-5/FEV1 scores. The predictors of clinical remission were identified.

RESULTS

29.3% (73/249) of AMR and 22.8% (37/162) of AXR cohort met the criteria for clinical remission. When lung function criteria were added, the remission rates were reduced to 25.2% and 19.1%, respectively. Sensitivity analyses identified that the remission rate ranged between 18.1% and 34.9% in the AMR cohort and 10.6% and 27.2% in the AXR cohort. Better lung function, lower body mass index, mild disease and absence of comorbidities such as obesity, depression and osteoporosis predicted the odds of achieving clinical remission.

CONCLUSION

Biologic treatment with mepolizumab or omalizumab for severe asthma-induced asthma remission in a subgroup of patients. Remission on treatment may be an achievable treatment target and future studies should consider remission as an outcome measure.

ψ(2S) Suppression in Pb-Pb Collisions at the LHC

The production of the ψ(2S) charmonium state was measured with ALICE in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV, in the dimuon decay channel. A significant signal was observed for the first time at LHC energies down to zero transverse momentum, at forward rapidity (2.5 Collapse

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A novel, multidomain, primary care nurse-led and mHealth-assisted intervention for dementia risk reduction in middle-aged adults (HAPPI MIND): study protocol for a cluster randomised controlled trial

INTRODUCTION

Middle-aged multidomain risk reduction interventions targeting modifiable risk factors for dementia may delay or prevent a third of dementia cases in later life. We describe the protocol of a cluster randomised controlled trial (cRCT), HAPPI MIND (Holistic Approach in Primary care for PreventIng Memory Impairment aNd Dementia). HAPPI MIND will evaluate the efficacy of a multidomain, nurse-led, mHealth supported intervention for assessing dementia risk and reducing associated risk factors in middle-aged adults in the Australian primary care setting.

METHODS AND ANALYSIS

General practice clinics (n≥26) across Victoria and New South Wales, Australia, will be recruited and randomised. Practice nurses will be trained to implement the HAPPI MIND intervention or a brief intervention. Patients of participating practices aged 45-65 years with ≥2 potential dementia risk factors will be identified and recruited (approximately 15 patients/clinic). Brief intervention participants receive a personalised report outlining their risk factors for dementia based on Australian National University Alzheimer's Disease Risk Index (ANU-ADRI) scores, education booklet and referral to their general practitioner as appropriate. HAPPI MIND participants receive the brief intervention as well as six individualised dementia risk reduction sessions with a nurse trained in motivational interviewing and principles of behaviour change, a personalised risk reduction action plan and access to the purpose-built HAPPI MIND smartphone app for risk factor self-management. Follow-up data collection will occur at 12, 24 and 36 months. Primary outcome is ANU-ADRI score change at 12 months from baseline. Secondary outcomes include change in cognition, quality of life and individual risk factors of dementia.

ETHICS AND DISSEMINATION

Project approved by Monash University Human Research Ethics Committee (ID: 28273). Results will be disseminated in peer-reviewed journals and at healthcare conferences. If effective in reducing dementia risk, the HAPPI MIND intervention could be integrated into primary care, scaled up nationally and sustained over time.

TRIAL REGISTRATION NUMBER

ACTRN12621001168842.

Measurements of Groomed-Jet Substructure of Charm Jets Tagged by D^{0} Mesons in Proton-Proton Collisions at sqrt[s]=13 TeV

Understanding the role of parton mass and Casimir color factors in the quantum chromodynamics parton shower represents an important step in characterizing the emission properties of heavy quarks. Recent experimental advances in jet substructure techniques have provided the opportunity to isolate and characterize gluon emissions from heavy quarks. In this Letter, the first direct experimental constraint on the charm-quark splitting function is presented, obtained via the measurement of the groomed shared momentum fraction of the first splitting in charm jets, tagged by a reconstructed D^{0} meson. The measurement is made in proton-proton collisions at sqrt[s]=13  TeV, in the low jet transverse-momentum interval of 15≤p_{T}^{jet ch}<30  GeV/c where the emission properties are sensitive to parton mass effects. In addition, the opening angle of the first perturbative emission of the charm quark, as well as the number of perturbative emissions it undergoes, is reported. Comparisons to measurements of an inclusive-jet sample show a steeper splitting function for charm quarks compared with gluons and light quarks. Charm quarks also undergo fewer perturbative emissions in the parton shower, with a reduced probability of large-angle emissions.

Measurement of the Lifetime and Λ Separation Energy of _{Λ}^{3}H

The most precise measurements to date of the _{Λ}^{3}H lifetime τ and Λ separation energy B_{Λ} are obtained using the data sample of Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV collected by ALICE at the LHC. The _{Λ}^{3}H is reconstructed via its charged two-body mesonic decay channel (_{Λ}^{3}H→^{3}He+π^{-} and the charge-conjugate process). The measured values τ=[253±11(stat)±6(syst)]  ps and B_{Λ}=[102±63(stat)±67(syst)]  keV are compatible with predictions from effective field theories and confirm that the _{Λ}^{3}H structure is consistent with a weakly bound system.

Treatable traits, combination inhaler therapy and the future of asthma management

The landscape of asthma has considerably changed in the last decade. Effective medications and inhaler devices have been developed and integrated into the asthma pharmacopoeia, but unfortunately, the proportion of uncontrolled patients remains unacceptably high. This is now recognized to be mainly due to the inappropriate use of medications or inhaler devices, heterogeneity of the disease or other factors contributing to the disease. Currently, inhaled corticosteroids (ICS), with or without long-acting beta agonists (LABA), are the cornerstone of asthma management, and recently international guidelines recognized the importance of combination inhaler therapy (ICS/LABA) even in mild asthma. In future, ultra-long-acting personalized medications and smart inhalers will complement combination inhaler therapy in order to effectively addresses issues such as adherence, inhaler technique and polypharmacy (both of drugs and devices). Asthma is now acknowledged as a multifaceted cluster of disorders and the treatment model has evolved from one-size-fits-all to precision medicine approaches such as treatable traits (TTs, defined as measurable and treatable clinically important factors) which encourages the quality use of medications and identification and management of all underlying behavioural and biological treatable risk factors. TT requires research and validation in a clinical context and the implementation strategies and efficacy in various settings (primary/secondary/tertiary care, low-middle income countries) and populations (mild/moderate/severe asthma) are currently evolving. Combination inhaler therapy and the TTs approach are complementary treatment approaches. This review examines the current status of personalized medicine and combination inhaler therapy, and describes futuristic views for these two strategies.

Measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC

We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5 Collapse

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First Measurement of Antideuteron Number Fluctuations at Energies Available at the Large Hadron Collider

The first measurement of event-by-event antideuteron number fluctuations in high energy heavy-ion collisions is presented. The measurements are carried out at midrapidity (|η|<0.8) as a function of collision centrality in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV using the ALICE detector. A significant negative correlation between the produced antiprotons and antideuterons is observed in all collision centralities. The results are compared with a state-of-the-art coalescence calculation. While it describes the ratio of higher order cumulants of the antideuteron multiplicity distribution, it fails to describe quantitatively the magnitude of the correlation between antiproton and antideuteron production. On the other hand, thermal-statistical model calculations describe all the measured observables within uncertainties only for correlation volumes that are different with respect to those describing proton yields and a similar measurement of net-proton number fluctuations.

Enhanced Deuteron Coalescence Probability in Jets

The transverse-momentum (p_{T}) spectra and coalescence parameters B_{2} of (anti)deuterons are measured in p-p collisions at sqrt[s]=13  TeV for the first time in and out of jets. In this measurement, the direction of the leading particle with the highest p_{T} in the event (p_{T}^{lead}>5  GeV/c) is used as an approximation for the jet axis. The event is consequently divided into three azimuthal regions, and the jet signal is obtained as the difference between the toward region, that contains jet fragmentation products in addition to the underlying event (UE), and the transverse region, which is dominated by the UE. The coalescence parameter in the jet is found to be approximately a factor of 10 larger than that in the underlying event. This experimental observation is consistent with the coalescence picture and can be attributed to the smaller average phase-space distance between nucleons in the jet cone as compared with the underlying event. The results presented in this Letter are compared to predictions from a simple nucleon coalescence model, where the phase-space distributions of nucleons are generated using pythia8 with the Monash 2013 tuning, and to predictions from a deuteron production model based on ordinary nuclear reactions with parametrized energy-dependent cross sections tuned on data. The latter model is implemented in pythia8.3. Both models reproduce the observed large difference between in-jet and out-of-jet coalescence parameters, although the almost flat trend of the B_{2}^{Jet} is not reproduced by the models, which instead give a decreasing trend.

Pre-analytical sample handling standardization for reliable measurement of metabolites and lipids in LC-MS-based clinical research

The emerging disciplines of lipidomics and metabolomics show great potential for the discovery of diagnostic biomarkers, but appropriate pre-analytical sample-handling procedures are critical because several analytes are prone to ex vivo distortions during sample collection. To test how the intermediate storage temperature and storage period of plasma samples from K3EDTA whole-blood collection tubes affect analyte concentrations, we assessed samples from non-fasting healthy volunteers (n = 9) for a broad spectrum of metabolites, including lipids and lipid mediators, using a well-established LC-MS-based platform. We used a fold change-based approach as a relative measure of analyte stability to evaluate 489 analytes, employing a combination of targeted LC-MS/MS and LC-HRMS screening. The concentrations of many analytes were found to be reliable, often justifying less strict sample handling; however, certain analytes were unstable, supporting the need for meticulous processing. We make four data-driven recommendations for sample-handling protocols with varying degrees of stringency, based on the maximum number of analytes and the feasibility of routine clinical implementation. These protocols also enable the simple evaluation of biomarker candidates based on their analyte-specific vulnerability to ex vivo distortions. In summary, pre-analytical sample handling has a major effect on the suitability of certain metabolites as biomarkers, including several lipids and lipid mediators. Our sample-handling recommendations will increase the reliability and quality of samples when such metabolites are necessary for routine clinical diagnosis.

1239 AGEING WELL IN FRAILTY: DEVELOPING A PRACTICAL MODEL FOR USE IN COMMUNITY PRACTICE TO IMPROVE PATIENT REPORTED WELLNESS

Introduction

Empowering patients to ‘age well’ (NHS England Long Term Plan, 2019) has become a key driver to meet the rising demand for healthcare. Despite a growing body of evidence regarding ageing well and the benefits of patient empowerment (Selman et al, 2017) and reducing demand on resources (Age UK, 2020), there remains confusion regarding applied meaning for the spectrum of older persons health. This research will consider expert view on the topic of ‘ageing well’ related to the predictable patterns of ageing. The aims of this study will be to develop a new interventional frailty stratification model to best meet the needs in advancing frailty.

Method

This research study will incorporate a systematic literature review alongside patient and carer focus groups to inform initial questionnaire design for a modified Delphi panel of mixed professional experts. The overall aim of undertaking rounds of questionnaire and subsequent survey will be to arrive at consensus expert view to fulfil the research aims of identifying a conceptual approach to be further tested in community clinical practice.

Results

The results of the study will inform a defined model of intervention to guide community practitioners in preventative care for frailty. Testing of the intervention will consider impact upon individuals, clinicians, and ongoing frailty trajectory.

Conclusion

At the time of the Autumn conference, the research study will be at recruitment stage for the modified Delphi panel. This abstract application is requesting support to share the background and progress to date with conference delegates to actively support a modified Delphi research process. The opportunity to showcase the study and network with participants to gauge interest in the ageing well research area would be a valued way to recruit an expert panel with the aim of improving care in this emerging and exciting aspect of older person’s care.

Radiation-induced electrophysiological remodelling in neonatal rat ventricular cardiomyocytes

Background

Ventricular tachycardia (VT) carries a relatively high risk of recurrence and significantly impacts patients' quality of life, despite state of the art treatment including antiarrhythmic drug therapy and catheter ablation. Cardiac stereotactic body radiotherapy (SBRT) has emerged as a promising non-invasive treatment option for refractory VT. A marked reduction in VT episodes is observed within days of treating high-risk patients with a single fraction SBRT. The cellular mechanisms underlying the clinically demonstrated antiarrhythmic effect are still poorly understood. Radiation-induced fibrosis is observed several months after irradiation, suggesting other mechanisms that explain the immediate benefit of radiotherapy on the VT substrate.

Purpose

We hypothesized that early antiarrhythmic effects of single-fraction radiation are produced by direct molecular and functional electrophysiological changes, independent of fibrosis. Our aim was to investigate the effects of 20 Gy ionizing photon radiation on the electrophysiology of ventricular neonatal rat cardiomyocytes at time periods from 24 hours to 96 hours after irradiation.

Methods

Ventricular neonatal rat cardiomyocytes were isolated, cultivated for 24 to 96 hours and then exposed to photon beam with a single dose of 20 Gy. Expression changes of ion channels, calcium handling proteins and structural proteins affecting cellular electrophysiology were assessed via RT-qPCR and Western blotting. Beat frequency was evaluated by video analysis and action potentials (APD) were recorded using the whole-cell voltage clamp technique in current-clamp mode. Intracellular calcium transients in Fura-2 AM loaded cardiomyocytes were recorded with an IonOptix recording system.

Results

Irradiation lead to significant changes in the mRNA and protein level of ion channels, with most distinct changes being observed 96h after radiation. Increased mRNA and protein expression of (Cav1.2) and of the potassium channels Kcnd3 (Kv4.3), Kcnh2 (Kv11.1), Kcnq1 (Kv7.1), Kcnk2 (K2P2.1) and Kcnj2 (Kir2.1) was observed. Additionally, Connexin 43 (Cx43) was upregulated. Irradiated cardiomyocytes showed a significant increase in beat rate over time. APD was significantly shortened, with a significantly increased upstroke velocity. Regarding calcium handling, significant upregulations of Ryr2 (RYR2) and Slc8a1 (NCX) transcript and protein level was detected. Additionally, calcium handling properties were altered.

Conclusion

Our results suggest that acute irradiation effects are associated with electrophysiological remodelling in cardiomyocytes. Changes of cellular ion channel expression and calcium homeostasis lead to normalization and shortening of heart-failure associated APD prolongation. These results reveal new insights into acute antiarrhythmic effects on cardiomyocytes after SBRT-therapy.

Funding Acknowledgement

Type of funding sources: None.

Sex-specific disparities in predictive factors of smoking cessation among smokers at high cardiovascular risk. Findings from a nationwide smoking cessation services cohort

Background

Tobacco use is a major risk factor for cardiovascular diseases (CVD), but smoking cessation (SC) reduces or even cancels the risk of CVD for both sex. Using data from the French national “Consultations de Dépendance Tabagique” (CDTnet) cohort, we aimed to determine the predictive factors of SC in men and women smokers at high cardiovascular (CV) risk (i.e. with a CV disease or risk factor).

Material and methods

Retrospective study from the French SC services CDT-net database. Inclusion criteria were age ≥18 years, and ≥1 CV risk factor (BMI ≥25 kg/m2, hypercholesterolemia, diabetes, arterial hypertension) or CVD (history of stroke, myocardial infarction or angina pectoris, peripheral arterial disease (PAD)). Smoking abstinence (≥28 consecutive days) was self-reported and confirmed by exhaled carbon monoxide &lt;10 ppm. Logistic regression assessed the association between SC and sociodemographic factors, medical characteristics and patients' smoking profile.

Results

Among the 246,364 subjects in the database, 15% (36,864) fulfilled the inclusion criteria. One month-abstinence was lower in women (52.6% (n=8,102) vs 55% (n=11,848) in men, p&lt;0.001). For both sex, smokers with the lowest abstinence rates were those with respiratory diseases (47% among women vs. 50% among men respectively), depression history (48% vs. 48%), anxiety or depression symptoms (49% vs 50%) use of anxiolytics/antidepressants, use of opioid substitution treatment, use of cannabis (42% vs 41%) and benefit less than 3 follow-up visits (36% vs 41%). Factors positively associated with SC in both sex were age &gt;65 years, having a degree, being employed, coming by self-initiation or by one's relatives, being overweight, having previous quit attempts, presenting with low nicotine dependence and being confident in achieving abstinence. Factors negatively associated with abstinence only in women but not in men was alcohol disorder. Finally, factors negatively associated with abstinence only in men but not in women were PAD, and tobacco-related cancers.

Conclusion

Our results from a large nationwide database suggest the relevance of differentiated management according to sex in smokers at high CV risk, given the major sex-specific disparities in factors associated with abstinence rates.

Funding Acknowledgement

Type of funding sources: Other. Main funding source(s): This work was supported by IReSP and INCa through a call for doctoral grants launched in 2019.

Elevated thyroid-stimulating hormone (TSH) is associated with atrial fibrillation and directly modulates electrophysiological properties of atrial cardiomyocytes

Background

Thyroid dysfunction has a strong association with cardiac arrhythmias. However, subclinical hypothyroidism (SH) is often neglected in studies. SH is characterized by increased values of TSH and normal values of T3/T4. Recent studies indicate that high TSH levels are related to an increased incidence of cardiac electrical abnormalities, especially atrial fibrillation (AF).

Purpose

The present work aims to investigate direct effects of TSH on ion channel remodelling in cardiomyocytes and a possible causative role in the increased occurrence of arrhythmia in SH.

Methods

A retrospective monocentric study analysed medical records, ECGs and echocardiographies of 3134 patients between 2007 to 2020. Inclusion criteria comprised patient age ≥18 years, normal fT4, TSH values 4–75 mU/l and available ECGs. The patient cohort was divided into two groups based on current treatment recommendations for SH (TSH level 4–9.9 mU/l; 10–75 mU/l).

Direct effects on ion channel remodelling were analysed in HL-1 and neonatal cardiomyocytes with confirmed expression of TSH receptors. TSH concentrations of 15, 30, and 60 mU/l simulated different degrees of hypothyroidism. RT-qPCR analyses, western blots and immunofluorescence stainings were performed after incubation with respective TSH concentrations for 24h. In vitro video analyses of automatism in NRCM before and after TSH incubation were performed.

Statistical comparisons were calculated using student's t-tests and the chi-square test. In addition, a multivariate analysis of factors affecting the occurrence of AF in patients with SH was carried out.

Results

Elevated TSH levels were associated with higher prevalence of AF. In the group of patients with a TSH value of 10–75 mU/l, AF was observed in 42.8% of cases compared to 31.7% in patients with lower TSH levels (p&lt;0.0001). In vitro, TSH application to cardiomyocytes led to significant changes in mRNA and protein expression of key ion channels and regulatory proteins. Incubation of HL-1 cells with 15 mU/l TSH showed a decrease in Kcne1 protein, while 60 mU/l TSH caused an upregulation of K2P3.1 (TASK-1), Kv7.1, and KCa2.1 expression. To further elucidate the TSH signaling cascade in cardiomyocytes, we investigated TSH effects on PKAα, CaMKIIδ and CaMKIIγ. PKAα was upregulated after 24h incubation with 60 mU/l TSH and exhibited an increase of the phosphorylated state. Finally, neonatal cardiomyocytes showed an increased beating rate after incubation with TSH.

Conclusion

The prevalence of atrial fibrillation is significantly increased in patients with SH. Our findings further reveal a direct effect of TSH on ion channel expression in cardiomyocytes as potential proarrhythmic mechanism. TSH induced changes in the expression of ion channels that determine action potential duration. Subclinical hypothyroidism contributes to the development of atrial fibrillation. Underlying mechanisms and therapeutic implications require further research.

Funding Acknowledgement

Type of funding sources: Public Institution(s). Main funding source(s): Heidelberg University Medical School - Olympia Morata

Identification of factors associated with smoking cessation in patients with coronary artery diseases. Findings from a large nationwide cohort of smoking cessation services

 

In patients with coronary artery diseases (CAD) (i.e. prior myocardial infarction (MI) or angina), smoking cessation (SC) is a major prevention goal. From a large French national database of SC services, we aimed to describe social, medical and smoking characteristics, as well as predictive factors of SC in men and women with CAD.

Methods

We conducted a retrospective study of smokers with CAD who visited a SC service and were included in the nationwide database of SC services (CDTnet). Endpoint was the abstinence rate, defined as SC maintained for at least 28 consecutive days, confirmed by an exhaled carbon monoxide &lt;10 ppm.

Results

Among the 4,532 smokers with CAD (myocardial infarction and angina), 21% (948) were women. The mean age was 55 years in both sexes. Two-thirds had consulted after a hospital contact and nearly half (45%) smoked more than 20 cigarettes per day. Compared to men, women presented more often with anxio-depression symptoms (57% vs 41%) and respiratory diseases (38% vs 28%), were less educated (65% vs 73% had at least one degree), suffered less often from other cardiovascular diseases such as stroke or peripheral arterial disease (16% vs 21%) and much lower rate of alcohol misuse (9% vs 25%). Finally, 82% of smokers received Nicotine Replacement Therapy (NRT) at the first consultation. The abstinence rate achieved was similar in women and men (54%). Factors positively associated with SC in women were: having more than one previous quit attempt, having a level of education ≥ first secondary school diploma) (OR=1.42; CI95% [1.04–1.95]) and using an electronic cigarette at the first consultation (OR=2.74; CI95% [1.22–6.58]). In men, these factors were: being employed (OR=1.25; CI95% [1.08–1.45]), declaring high confidence in quitting (OR=1.24; CI95% [1.07–1.44]) and using NRT (OR=1.41; CI95% [1.13–1.74]). Psychiatric or respiratory diseases were negatively associated with SC in both men and women. In men, the factors negatively associated with SC were: smoking at home, having diabetes, using cannabis and presenting with high nicotine dependence. Among women, living with a smoker hampered SC.

Conclusion

Our findings on a large nationwide cohort from SC services showed that in smokers with prior MI or angina, it is important to take into account comorbidities, particularly psychiatric and respiratory disorders, in order to improve smoking cessation rates.

Funding Acknowledgement

Type of funding sources: Other. Main funding source(s): This work was supported by IReSP and INCa through a call for doctoral grants launched in 2019

Measurements of multiple heat flux components at the divertor target by using surface eroding thermocouples (invited)

The Surface Eroding Thermocouple (SETC) is a robust diagnostic utilized in DIII-D to provide fast, edge-localized modes (ELMs) resolved heat flux measurements, in particular in geometric regions that are too shadowed for traditional infrared thermography. In order to further investigate the power dissipation in the divertor region, a combination of flush-mounted and recessed SETCs was developed to assess the effect on surface heating from non-charged particles at the divertor target. Utilizing the Divertor Materials Evaluation System sample exposure platform, the first demonstration of the feasibility of using this new method to distinguish between the heat flux from charged particles and that from neutrals and radiative heating was achieved. This paper details the process of using the combination of flush SETCs and recessed SETCs to measure the multiple heat flux components at the divertor target and further discusses how to determine two important ratios, α (ratio of heat flux from charged particles deposit on recessed SETC to that deposit on flush SETC) and β (ratio of heat flux from non-charged particles deposit on recessed SETC to that deposit on flush SETC), in the estimation of the heat flux from non-charged particle sources. Using a time dependent ratio α, it was found that ∼50% of the total incident heat flux is attributable to the non-charged particles in the fully detached open divertor in DIII-D. Finally, the new application of similar SETC diagnostics in the Small Angle Slot divertor with a V-like configuration and partial tungsten coated surface (SAS-VW) is also introduced.

[Alcohol and atrial fibrillation]

Atrial fibrillation (AF) is the most common heart rhythm disorder, with an increasing prevalence, currently estimated at 3 % of the world population. It has long been well known, as the holiday heart syndrome, that acute alcohol consumption (binge drinking) may trigger an episode of AF, most often benign, during or immediately after consumption. Meta-analyses of observational studies have clearly shown a significant association between a high level of alcohol consumption and the risk of AF. According to the studies included in meta-analyses, the conclusions may differ regarding the association between low and moderate levels of alcohol consumption and the risk of AF. The association probably only exists from a level of consumption of at least one drink per day. Heavy alcohol consumption appears to increase the risk of complications in patients with AF, while light or moderate alcohol consumption does not. The causal nature of the relationship between alcohol consumption and AF cannot currently be confirmed or denied, given the contradictory results of Mendelian randomization studies published to date. However, in patients diagnosed with AF, the recommendation to abstain from alcohol, resulting in a strong reduction in consumption, made it possible to significantly reduce the recurrence of AF episodes.

Which smokers enrol in a hospital based smoking cessation trial? Survey of smoking related behaviours, quit attempts and motivation to quit

BACKGROUND

Understanding smoking behaviours in hospital patients who smoke may improve inpatient cessation treatments. This study aimed to describe smoking-related behaviours, past-quit attempts, and self-reported difficulties experienced in quitting among those who enrolled in a smoking cessation trial of varenicline.

METHODS

Baseline data were obtained from adult hospitalised smokers (average ≥10 cigarettes/day in 4-weeks prior to hospitalisation) who enrolled in a randomised, placebo-controlled trial of varenicline ± nicotine lozenges at 5 Australian public hospitals. A logistic regression model tested the association between participant characteristics and quitting in the previous 12 months.

RESULTS

Participants' (n=320; 57% male, 52.5 ± 12.1 years old) motivation and confidence in quitting were high. A total of 120 participants (37.5%) had attempted quitting in the previous 12-months. Prior hospitalisation (P=0.008) and employment status (P=0.015) were significantly associated with past quit attempts. No statistically significant differences were noted in the reason for hospitalisation or the level of nicotine dependence between participants who attempted quitting in the previous 12 months and their counterparts. Smoking cessation pharmacotherapy was used by 55% of those attempting to quit; nicotine replacement therapy (65.2%) and varenicline (16.7%) most common. Stress or anxiety, urges to smoke and a lack of motivation were the difficulties experienced in past quit attempts.

CONCLUSIONS

Those who had a prior hospitalisation and were unemployed had significantly greater odds of reporting past quit attempts. Further research is needed to investigate the degree of adherence among inpatient smokers with the smoke-free hospital policies and the frequency of NRT provision and uptake on admission. This article is protected by copyright. All rights reserved.

Evaluation of prognostic risk models for postoperative pulmonary complications in adult patients undergoing major abdominal surgery: a systematic review and international external validation cohort study

BACKGROUND

Stratifying risk of postoperative pulmonary complications after major abdominal surgery allows clinicians to modify risk through targeted interventions and enhanced monitoring. In this study, we aimed to identify and validate prognostic models against a new consensus definition of postoperative pulmonary complications.

METHODS

We did a systematic review and international external validation cohort study. The systematic review was done in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. We searched MEDLINE and Embase on March 1, 2020, for articles published in English that reported on risk prediction models for postoperative pulmonary complications following abdominal surgery. External validation of existing models was done within a prospective international cohort study of adult patients (≥18 years) undergoing major abdominal surgery. Data were collected between Jan 1, 2019, and April 30, 2019, in the UK, Ireland, and Australia. Discriminative ability and prognostic accuracy summary statistics were compared between models for the 30-day postoperative pulmonary complication rate as defined by the Standardised Endpoints in Perioperative Medicine Core Outcome Measures in Perioperative and Anaesthetic Care (StEP-COMPAC). Model performance was compared using the area under the receiver operating characteristic curve (AUROCC).

FINDINGS

In total, we identified 2903 records from our literature search; of which, 2514 (86·6%) unique records were screened, 121 (4·8%) of 2514 full texts were assessed for eligibility, and 29 unique prognostic models were identified. Nine (31·0%) of 29 models had score development reported only, 19 (65·5%) had undergone internal validation, and only four (13·8%) had been externally validated. Data to validate six eligible models were collected in the international external validation cohort study. Data from 11 591 patients were available, with an overall postoperative pulmonary complication rate of 7·8% (n=903). None of the six models showed good discrimination (defined as AUROCC ≥0·70) for identifying postoperative pulmonary complications, with the Assess Respiratory Risk in Surgical Patients in Catalonia score showing the best discrimination (AUROCC 0·700 [95% CI 0·683-0·717]).

INTERPRETATION

In the pre-COVID-19 pandemic data, variability in the risk of pulmonary complications (StEP-COMPAC definition) following major abdominal surgery was poorly described by existing prognostication tools. To improve surgical safety during the COVID-19 pandemic recovery and beyond, novel risk stratification tools are required.

FUNDING

British Journal of Surgery Society.

Hypertriton Production in p-Pb Collisions at sqrt[s_{NN}]=5.02 TeV

The study of nuclei and antinuclei production has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. The first measurement of the production of _{Λ}^{3}H in p-Pb collisions at sqrt[s_{NN}]=5.02  TeV is presented in this Letter. Its production yield measured in the rapidity interval -1<y<0 for the 40% highest-multiplicity p-Pb collisions is dN/dy=[6.3±1.8(stat)±1.2(syst)]×10^{-7}. The measurement is compared with the expectations of statistical hadronization and coalescence models, which describe the nucleosynthesis in hadronic collisions. These two models predict very different yields of the hypertriton in charged particle multiplicity environments relevant to small collision systems such as p-Pb, and therefore the measurement of dN/dy is crucial to distinguish between them. The precision of this measurement leads to the exclusion with a significance larger than 6.9σ of some configurations of the statistical hadronization model, thus constraining the theory behind the production of loosely bound states at hadron colliders.

Post-mortem changes of prostanoid concentrations in tissues of mice: Impact of fast cervical dislocation and dissection delay

Prostanoids are potent lipid mediators involved in a wide variety of physiological functions like blood pressure regulation or inflammation as well as cardiovascular and malign diseases. Elucidation of their modes of action is mainly carried out in pre-clinical animal models by quantifying prostanoids in tissues of interest. Unfortunately, prostanoids are prone to post-mortem artifact formation and de novo synthesis can already be caused by external stimuli during the euthanasia of animals like prolonged hypercapnia or ischemia. Therefore, this study investigates the suitability and impact of fast cervical dislocation for the determination of prostanoids (6-keto-PGF_1α, TXB₂, PGF_2α, PGD₂, PGE₂) in seven tissues of mice (spinal cord, brain, sciatic nerve, kidney, liver, lung, and spleen) to minimize time-dependent effects and approximate physiological concentrations. Tissues were dissected in a standardized sequence directly or after 10 min to investigate the influence of dissection delays. The enzyme inhibitor indomethacin (10 µM) in combination with low processing temperatures was employed to preserve prostanoid concentrations during sample preparation. Quantification of prostanoids was performed via LC-MS/MS. This study shows, that prostanoids are differentially susceptible to post-mortem artifact formation which is closely connected to their physiological function and metabolic stability in the respective tissues. Prostanoids in the brain, spinal cord, and kidney that are not involved in the regulatory response post-mortem, i.e. blood flow regulation (6-keto-PGF_1α, PGE₂, PGF_2α) showed high reproducibility even after dissection delay and could be assessed after fast cervical dislocation if prerequisites like standardized pre-analytical workflows with immediate dissection and inhibition of residual enzymatic activity are in place. However, in tissues with high metabolic activity (liver, lung) more stable prostanoid metabolites should be used. Moreover, prostanoids in the spleen were strongly affected by dissection delays and presumably the method of euthanasia itself.

Cryoballoon-ablation of atrial fibrillation in patients with heart failure and preserved ejection fraction

Funding Acknowledgements

Type of funding sources: Public Institution(s). Main funding source(s): Deutsches Zentrum für Herz-Kreislauf-Forschung (DZHK)

Background

Co-existence of atrial fibrillation (AF) and heart failure with preserved ejection fraction (HFpEF) is common and severely affects morbidity and prognosis.

Purpose

This study evaluates outcome after cryoballoon-ablation for AF in HFpEF compared to patients without heart failure employing multiple diagnostic modalities.

Methods

A total of 102 patients scheduled for cryoablation of AF with LVEF≥50% were prospectively enrolled. Baseline evaluation included echocardiography, stress echocardiography, six-minute-walk-test, biomarker measurements and quality of life assessment (SF-36). HFpEF was diagnosed according to current guidelines and confirmed applying the HFA-PEFF-Score. Procedural parameters as well as clinical, functional and echocardiographic endpoints at follow-up ≥12 months after AF-ablation were compared between patients with and without HFpEF.

Results

Patients with HFpEF (n=24) were older (median: 73.5 years [Q25: 66.5 years; Q75: 75.8 years] vs. 64.5 years [Q25: 55.0 years; Q75: 71.3 years], P&lt;0.001) and more often female (83.3% vs. 28.2%). They were characterized by more pronounced AF-related symptoms (median EHRA-score: 3.0 [Q25:3.0; Q75:3.0] vs. 2.0 [Q25: 2.0; Q75: 3.0], P&lt;0.001), reduced distance in six-minute-walk-test (median 487.5m [Q25: 378.1m; Q75: 517.8m] vs. 539.0m [Q25: 489.3m; Q75:589.1 m], P&lt;0.001), and higher mean left atrial (LA)-pressure measured at the needle tip at transseptal puncture (14.0mmHg [Q25: 10.3mmHg; Q75: 21.5mmHg] vs. 10.0 mmHg [Q25: 8.0mmHg; Q75: 13.3mmHg], P=0.008). Procedural parameters were comparable between the two subgroups. Rates of AF-recurrence, repeat AF-ablation and AF-related re-hospitalization were increased in HFpEF (Figure 1A-C), which was confirmed after adjusting for intergroup differences in sex and age distribution by multiple regression analysis. There was no improvement of heart failure-related symptoms and persistent elevation of cardiac biomarkers, even in HFpEF-patients with successful restoration of sinus rhythm at follow-up (Figure 2A-C). Echocardiographic follow-up showed progression of adverse LA-remodeling (LA-volume index at baseline: 35.8ml/m2 [Q25: 32.2ml/m2; Q75: 41.9ml/m2] vs. 12-month follow-up: 40.5ml/m2 [Q25: 36.0ml/m2; Q75: 51.4ml/m2], P=0.017) and no improvement in diastolic function in HFpEF (E/e’ at baseline: 9.7 [Q25: 7.8; Q75: 12.1] vs 12-month follow-up: 10.2 [Q25: 8.4; Q75: 11.8], P=0.874), in particular in patients with HFpEF and AF-recurrence. Quality of life improved in patients without HFpEF in both physical and mental summary scales, however, no beneficial effect was seen in HFpEF.

Conclusion

Patients with HFpEF constitute a distinct subgroup with an elevated risk for arrhythmia recurrence after cryoablation of AF. Functional hallmarks and heart-failure related symptoms of HFpEF persisted in our cohort, irrespective of rhythm-status at follow-up. Future research is needed to optimize tailored treatment strategies in HFpEF.

Educational interventions for health professionals managing chronic obstructive pulmonary disease in primary care

BACKGROUND

Chronic obstructive pulmonary disease (COPD) is a common, preventable and treatable health condition. COPD is associated with substantial burden on morbidity, mortality and healthcare resources.

OBJECTIVES

To review existing evidence for educational interventions delivered to health professionals managing COPD in the primary care setting.

SEARCH METHODS

We searched the Cochrane Airways Trials Register from inception to May 2021. The Register includes records from the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, Embase, Cumulative Index to Nursing and Allied Health Literature (CINAHL), Allied and Complementary Medicine Database (AMED) and PsycINFO. We also searched online trial registries and reference lists of included studies.

SELECTION CRITERIA

We included randomised controlled trials (RCTs) and cluster-RCTs. Eligible studies tested educational interventions aimed at any health professionals involved in the management of COPD in primary care. Educational interventions were defined as interventions aimed at upskilling, improving or refreshing existing knowledge of health professionals in the diagnosis and management of COPD.

DATA COLLECTION AND ANALYSIS

Two review authors independently reviewed abstracts and full texts of eligible studies, extracted data and assessed the risk of bias of included studies. We conducted meta-analyses where possible and used random-effects models to yield summary estimates of effect (mean differences (MDs) with 95% confidence intervals (CIs)). We performed narrative synthesis when meta-analysis was not possible. We assessed the overall certainty of evidence for each outcome using Grades of Recommendation, Assessment, Development and Evaluation (GRADE). Primary outcomes were: 1) proportion of COPD diagnoses confirmed with spirometry; 2) proportion of patients with COPD referred to, participating in or completing pulmonary rehabilitation; and 3) proportion of patients with COPD prescribed respiratory medication consistent with guideline recommendations.

MAIN RESULTS

We identified 38 studies(22 cluster-RCTs and 16 RCTs) involving 4936 health professionals (reported in 19/38 studies) and 71,085 patient participants (reported in 25/38 studies). Thirty-six included studies evaluated interventions versus usual care; seven studies also reported a comparison between two or more interventions as part of a three- to five-arm RCT design. A range of simple to complex interventions were used across the studies, with common intervention features including education provided to health professionals via training sessions, workshops or online modules (31 studies), provision of practice support tools, tool kits and/or algorithms (10 studies), provision of guidelines (nine studies) and training on spirometry (five studies). Health professionals targeted by the interventions were most commonly general practitioners alone (20 studies) or in combination with nurses or allied health professionals (eight studies), and the majority of studies were conducted in general practice clinics. We identified performance bias as high risk for 33 studies. We also noted risk of selection, detection, attrition and reporting biases, although to a varying extent across studies. The evidence of efficacy was equivocal for all the three primary endpoints evaluated: 1) proportion of COPD diagnoses confirmed with spirometry (of the four studies that reported this outcome, two supported the intervention); 2) proportion of patients with COPD who are referred to, participate in or complete pulmonary rehabilitation (of the four studies that reported this outcome, two supported the intervention); and 3) proportion of patients with COPD prescribed respiratory medications consistent with guideline recommendations (12 studies reported this outcome, the majority evaluated multiple drug classes and reported a mixed effect). Additionally, the low quality of evidence and potential risk of bias make the interpretation more difficult. Moderate-quality evidence (downgraded due to risk of bias concerns) suggests that educational interventions for health professionals probably improve the proportion of patients with COPD vaccinated against influenza (three studies) and probably have little impact on the proportion of patients vaccinated against pneumococcal infection (two studies). Low-quality evidence suggests that educational interventions for health professionals may have little or no impact on the frequency of COPD exacerbations (10 studies). There was a high degree of heterogeneity in the reporting of health-related quality of life (HRQoL). Low-quality evidence suggests that educational interventions for health professionals may have little or no impact on HRQoL overall, and when using the COPD-specific HRQoL instrument, the St George's Respiratory Questionnaire (at six months MD 0.87, 95% CI -2.51 to 4.26; 2 studies, 406 participants, and at 12 months MD -0.43, 95% CI -1.52 to 0.67, 4 studies, 1646 participants; reduction in score indicates better health). Moderate-quality evidence suggests that educational interventions for health professionals may improve patient satisfaction with care (one study). We identified no studies that reported adverse outcomes.

AUTHORS' CONCLUSIONS

The evidence of efficacy was equivocal for educational interventions for health professionals in primary care on the proportion of COPD diagnoses confirmed with spirometry, the proportion of patients with COPD who participate in pulmonary rehabilitation, and the proportion of patients prescribed guideline-recommended COPD respiratory medications. Educational interventions for health professionals may improve influenza vaccination rates among patients with COPD and patient satisfaction with care. The quality of evidence for most outcomes was low or very low due to heterogeneity and methodological limitations of the studies included in the review, which means that there is uncertainty about the benefits of any currently published educational interventions for healthcare professionals to improve COPD management in primary care. Further well-designed RCTs are needed to investigate the effects of educational interventions delivered to health professionals managing COPD in the primary care setting.

Polarization of Λ and Λ[over ¯] Hyperons along the Beam Direction in Pb-Pb Collisions at sqrt[s]_{NN}=5.02 TeV

The polarization of the Λ and Λ[over ¯] hyperons along the beam (z) direction, P_{z}, has been measured in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV recorded with ALICE at the Large Hadron Collider (LHC). The main contribution to P_{z} comes from elliptic flow-induced vorticity and can be characterized by the second Fourier sine coefficient P_{z,s2}=⟨P_{z}sin(2φ-2Ψ_{2})⟩, where φ is the hyperon azimuthal emission angle and Ψ_{2} is the elliptic flow plane angle. We report the measurement of P_{z,s2} for different collision centralities and in the 30%-50% centrality interval as a function of the hyperon transverse momentum and rapidity. The P_{z,s2} is positive similarly as measured by the STAR Collaboration in Au-Au collisions at sqrt[s_{NN}]=200  GeV, with somewhat smaller amplitude in the semicentral collisions. This is the first experimental evidence of a nonzero hyperon P_{z} in Pb-Pb collisions at the LHC. The comparison of the measured P_{z,s2} with the hydrodynamic model calculations shows sensitivity to the competing contributions from thermal and the recently found shear-induced vorticity, as well as to whether the polarization is acquired at the quark-gluon plasma or the hadronic phase.

Asthma remission- what is it and how can it be achieved?

Asthma treatment goals currently focus on symptom and exacerbation control rather than remission. Remission is not identical to cure but is a step closer. This review considers the current definitions of remission in asthma, the prevalence and predictors, the pathophysiology of remission, the possibility of achieving it using the available treatment options and the future research directions. Asthma remission is characterised by a high level of disease control, including the absence of symptoms and exacerbations, and normalisation or optimisation of lung function with or without ongoing treatment. Even in those who develop a symptomatic remission of asthma, persistent pathological abnormalities are common, leading to a risk of subsequent relapse at any time. Complete remission requires normalisation or stabilisation of any underlying pathology in addition to symptomatic remission. Remission is possible as part of the natural history of asthma, and the prevalence of remission in the adult asthma population varies between 2% and 52%. The factors associated with remission include mild asthma, better lung function, better asthma control, younger age, early-onset asthma, shorter duration of asthma, milder bronchial hyper-responsiveness, fewer comorbidities and smoking cessation or never smoking. Although previous studies have not targeted treatment-induced remission, there is some evidence to show that the current long-term add on therapies such as biologics and azithromycin can achieve some criteria for asthma remission on treatment, at least in a subgroup of patients. However, more research is required. Long-term remission could be included as a therapeutic goal in studies of asthma treatments.

Measurement of the Groomed Jet Radius and Momentum Splitting Fraction in pp and Pb-Pb Collisions at sqrt[s_{NN}]=5.02 TeV

This article presents groomed jet substructure measurements in pp and Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV with the ALICE detector. The soft drop grooming algorithm provides access to the hard parton splittings inside a jet by removing soft wide-angle radiation. We report the groomed jet momentum splitting fraction, z_{g}, and the (scaled) groomed jet radius, θ_{g}. Charged-particle jets are reconstructed at midrapidity using the anti-k_{T} algorithm with resolution parameters R=0.2 and R=0.4. In heavy-ion collisions, the large underlying event poses a challenge for the reconstruction of groomed jet observables, since fluctuations in the background can cause groomed parton splittings to be misidentified. By using strong grooming conditions to reduce this background, we report these observables fully corrected for detector effects and background fluctuations for the first time. A narrowing of the θ_{g} distribution in Pb-Pb collisions compared to pp collisions is seen, which provides direct evidence of the modification of the angular structure of jets in the quark-gluon plasma. No significant modification of the z_{g} distribution in Pb-Pb collisions compared to pp collisions is observed. These results are compared with a variety of theoretical models of jet quenching, and provide constraints on jet energy-loss mechanisms and coherence effects in the quark-gluon plasma.

Staff and student experiences and attitudes towards smoking and smoking cessation, University of Jeddah, Saudi Arabia

INTRODUCTION

Tobacco smoking causes an estimated 7 million deaths per annum with 70 thousand of those occurring in the Kingdom of Saudi Arabia (KSA) where the National Transformation Program highlights the need to prioritize smoking cessation. The objective of this study was to determine the experiences and attitudes of university staff and students, who have been or are currently smokers, towards smoking and smoking cessation.

METHODS

A link to a cross-sectional online survey was distributed by email in October and November 2020 to students and staff (n=34872) at the University of Jeddah, KSA. The survey was based on WHO GATS, CSS-21 and a systematic review. Data were analyzed using descriptive statistics in JASP (version 0.14.1) [Computer software].

RESULTS

A total of 666 responses were collected. Most respondents had never smoked (n=556; 83.5%) with some current smokers (n=72; 10.8%) and few former smokers (n=12; 1.8%). Major challenges of quitting smoking identified by the CSS-21 tool were intrinsic factors such as ‘withdrawal symptoms’ (n=28; 37.8%), ‘being addicted to cigarettes’ (n=24; 34.8%), ‘having strong emotions or feelings’ (n=28; 38.4%), and ‘seeing things or people which reminded me’ (n=25; 34.2%). The extrinsic factors were mostly reported as ‘not a challenge’, such as ‘use of other substances like cannabis, alcohol, etc.’ (n=60; 87.0%) or ‘lack of support or encouragement from health professionals to stop smoking’ (n=50; 69.4%). Many staff and students were ‘asked if you smoked tobacco products’ at a healthcare professional appointment with (n=5; 83.3%) and (n=27; 71.1%), respectively. Both staff (n=6; 75.0%) and students (n=19; 34.5%) thought ‘face-to-face counselling’ would help support their future attempts to quit.

CONCLUSIONS

The majority of smokers who participated saw intrinsic factors more of a challenge than extrinsic factors. This new knowledge has the potential to influence decision makers. There is potential for encouraging healthcare practitioners to promote smoking cessation conversations.

Measurement of Prompt D^{0}, Λ_{c}^{+}, and Σ_{c}^{0,++}(2455) Production in Proton-Proton Collisions at sqrt[s]=13 TeV

The p_{T}-differential production cross sections of prompt D^{0}, Λ_{c}^{+}, and Σ_{c}^{0,++}(2455) charmed hadrons are measured at midrapidity (|y|<0.5) in pp collisions at sqrt[s]=13  TeV. This is the first measurement of Σ_{c}^{0,++} production in hadronic collisions. Assuming the same production yield for the three Σ_{c}^{0,+,++} isospin states, the baryon-to-meson cross section ratios Σ_{c}^{0,+,++}/D^{0} and Λ_{c}^{+}/D^{0} are calculated in the transverse momentum (p_{T}) intervals 2<p_{T}<12 and 1<p_{T}<24  GeV/c. Values significantly larger than in e^{+}e^{-} collisions are observed, indicating for the first time that baryon enhancement in hadronic collisions also extends to the Σ_{c}. The feed-down contribution to Λ_{c}^{+} production from Σ_{c}^{0,+,++} is also reported and is found to be larger than in e^{+}e^{-} collisions. The data are compared with predictions from event generators and other phenomenological models, providing a sensitive test of the different charm-hadronization mechanisms implemented in the models.