Publications by authors named "Janson Christer"

Introduction: Previous population-based studies, mainly from high-income countries, have shown that a higher forced vital capacity (FVC) is associated with a lower risk of developing cardiometabolic diseases. The aim of this study was to assess the longitudinal association between spirometry measures and the onset of cardiometabolic diseases across sites in low-income, middle-income and high-income countries.

Methods: The study population comprised 5916 individuals from 15 countries participating in the Burden of Obstructive Lung Disease baseline and follow-up assessments.

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Article Synopsis
  • Spirometry is a test used to evaluate lung function by comparing it to normal levels in healthy non-smokers, focusing on metrics like forced vital capacity (FVC) and the FEV/FVC ratio.
  • The study analyzed data from over 14,000 participants aged 40 and older across 41 sites, revealing regional differences in FVC tied to factors like age and height, categorized into four regions: Europe/richer countries, Near East, Africa, and Far East.
  • Findings showed significant regional variations in FVC values between men and women, particularly in Europe compared to the Far East, but minimal differences in the FEV/FVC ratio across regions.
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Unlabelled: Obstructive sleep apnoea (OSA) and its associations with lung function.

Background: OSA is highly prevalent and characterised by abnormal respiration during sleep. This large, population-based study aimed to investigate the associations between OSA and lung function in subjects aged 50-64 years.

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Background: Both depression and respiratory disease are common today in young populations. However, little is known about the relationship between them.

Aims: This study aims to explore the association between depression in childhood to early adulthood and respiratory health outcomes in early adulthood, and the potential underlying mechanisms.

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Background: Therapies targeting IL-5 or its receptor (IL-5Rα) are currently used to treat patients with severe eosinophilic asthma.

Objective: We sought to investigate the impact of anti-IL-5 and anti-IL-5Rα biological therapies on mast cells (MCs) and their progenitors.

Methods: Surface IL-5Rα expression was investigated on MCs and their progenitors in mouse lungs and bone marrow and in human lungs and blood.

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Background: Few studies have investigated the influence of body mass index (BMI) trajectories on lung function covering the entire growth period.

Methods: We conducted a prospective study using data from the Swedish BAMSE birth cohort. Latent class mixture modelling was employed to examine the diversity in BMI z-scores from birth to 24 years of age.

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The pandemic of coronavirus disease-19 (COVID-19), provoked by the appearance of a novel coronavirus named severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), required a worldwide healthcare emergency. This has elicited an immediate need for accelerated research into its mechanisms of disease, criteria for diagnosis, methods for forecasting outcomes, and treatment approaches. microRNAs (miRNAs), are diminutive RNA molecules, that are non-coding and participate in gene expression regulation post-transcriptionally, having an important participation in regulating immune processes.

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Introduction: In adult-onset asthma, two major endotypes have been proposed: T2 with eosinophilia and non-T2 characterised by neutrophils and interleukin (IL)-17. The objective of the study was to examine the endotype marker profile in patients with severe asthma who were hospitalized for exacerbations, with a focus on differentiating between viral and non-viral triggers.

Material And Methods: Forty-nine patients with asthma, admitted for exacerbations, and 51 healthy controls (HCs) were recruited.

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Background: Long-term oxygen supplementation for at least 15 hours per day prolongs survival among patients with severe hypoxemia. On the basis of a nonrandomized comparison, long-term oxygen therapy has been recommended to be used for 24 hours per day, a more burdensome regimen.

Methods: To test the hypothesis that long-term oxygen therapy used for 24 hours per day does not result in a lower risk of hospitalization or death at 1 year than therapy for 15 hours per day, we conducted a multicenter, registry-based, randomized, controlled trial involving patients who were starting oxygen therapy for chronic, severe hypoxemia at rest.

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Introduction: The study aimed to compare prevalence of comorbid allergic manifestations and rhinitis, allergy testing and associations with patient-related outcomes in patients with asthma and COPD.

Methods: Cross-sectional study of randomly selected Swedish patients with a doctor's diagnosis of asthma ( = 1291) or COPD ( = 1329). Self-completion questionnaires from 2014 provided data on demographics, rhinitis, allergic symptoms at exposure to pollen or furry pets, exacerbations, self-assessed severity of disease and scores from the Asthma Control Test (ACT) and the COPD Assessment Test (CAT), and records were reviewed for allergy tests.

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Introduction: Both physicians and patients are increasingly aware of the environmental impacts of medication. The shift of treatment paradigm towards MART-treatment (Maintenance and Reliever Therapy) in asthma affects the treatment-related emissions. The carbon footprint of inhaled medication is also tied to the type of the device used.

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Article Synopsis
  • - The study investigates the prevalence of chronic airflow limitation (CAL), emphysema, and impaired lung diffusing capacity (Dl) in a middle-aged Swedish population (ages 50-64) in relation to smoking habits and respiratory symptoms.
  • - Results showed that 8.8% had CAL and emphysema, and 5.7% had impaired Dl, with higher rates in current smokers compared to ex-smokers and never-smokers.
  • - The research indicates that CAL and impaired Dl are linked to common respiratory symptoms, while asthma in never-smokers with CAL shows distinct characteristics that may require different clinical management than traditional smoking-related COPD.
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Aim: Heritability of cough has not yet been studied. We aimed to evaluate if individuals with cough are more likely to have offspring who develop cough, and if these associations differ by type of cough (productive/nonproductive).

Methods: The RHINESSA Generation Study (Respiratory Health In Northern Europe, Spain and Australia) includes 7155 parents (initially aged 30-54) answering detailed questionnaires in 2000 and 2010, and 8176 offspring ≥20 years answering similar questionnaires in 2012-2019.

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Knowledge regarding the prevalence and shared and unique characteristics of the restrictive spirometric pattern (RSP) and preserved ratio impaired spirometry (PRISm) is lacking for a general population investigated with post-bronchodilator spirometry and computed tomography of the lungs. To investigate shared and unique features for RSP and PRISm. In the Swedish CArdioPulmonary bioImage Study (SCAPIS), a general population sample of 28,555 people aged 50-64 years (including 14,558 never-smokers) was assessed.

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Objectives: To investigate the association of early snus use initiation (≤15 years of age) with asthma and asthma symptoms.

Design: Cross-sectional analysis of a population-based cohort.

Setting: Study centres in Norway, Sweden, Iceland, Denmark and Estonia, from 2016 to 2019.

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Background: A substantial proportion of individuals with COPD have never smoked, and it is implied to be more common than previously anticipated but poorly studied.

Aim: To describe the process of recruitment of never-smokers with COPD from a population-based cohort ( = 30 154).

Methods: We recruited never-smokers with COPD, aged 50-75 years, from six University Hospitals, based on: 1) post broncho-dilator forced expiratory volume in 1 second/forced vital capacity (FEV/FVC) < 0.

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Purpose: To study risk factors for uncontrolled asthma and insufficient quality of life (QoL) in patients with mild asthma, ie those without preventer treatment.

Patients And Methods: Patients aged 18-75 years with a doctor's diagnosis of asthma randomly selected from primary and secondary care in Sweden. Mild asthma was defined as self-reported current asthma and no preventer treatment.

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: Systemic inflammation is common in chronic obstructive pulmonary disease (COPD), and evidence suggests that inflammatory biomarkers can predict acute exacerbations (AECOPDs). The aim of this study was to analyse whether C-reactive protein (CRP), fibrinogen, white blood cell count (WBC), or the blood cell indices PLR (platelet-to-lymphocyte ratio), SII (systemic immune inflammation index), SIRI (systemic inflammation response index), and AISI (aggregate index of systemic inflammation) can predict future AECOPDs. In the Tools Identifying Exacerbations (TIE) cohort study, participants with spirometry-confirmed COPD were recruited from primary and secondary care in three Swedish regions and assessed during a stable phase of COPD.

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Background: The immunological mechanisms behind the clinical association between asthma and obesity in adolescence are not fully understood. This study aimed to find new plasma protein biomarkers associated specifically with coincident asthma and obesity in adolescents.

Methods: This was a cross-sectional study in children and adolescents 10-19 years old (N = 390).

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The benefits of improved air quality on asthma remain understudied. Our aim was to investigate associations of changes in ambient air pollution with incident asthma from school age until young adulthood in an area with mostly low air pollution levels. Participants in the BAMSE (Swedish abbreviation for Children, Allergy, Environment, Stockholm, Epidemiology) birth cohort from Stockholm without asthma before the 8-year follow-up were included ( = 2,371).

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Article Synopsis
  • The SQ tree SLIT-tablet is a special medicine used to treat allergies from certain trees and is approved in 21 European countries.
  • A study looked at how safe this medicine is when real people use it in everyday life, checking for any bad reactions and how patients feel after taking it.
  • The study found that most people had mild to moderate side effects, but many experienced improvement in their allergy symptoms, and using this medicine alongside others didn't make things worse.
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Background: Lower birth weight and preterm birth may increase the risk of adverse health outcomes later in life. We examined whether maternal exposure to air pollution and greenness during pregnancy is associated with offspring birth weight and preterm birth.

Methods: We analyzed data on 4286 singleton births from 2358 mothers from Respiratory Health in Northern Europe, a prospective questionnaire-based cohort study (1990-2010).

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