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Britt Overgaard Hedegaard,1 Kjell Erik Julius Håkansson,2 Frodi Fridason Jensen,2,3 Charlotte Suppli Ulrik,2,4 Ulla Møller Weinreich1,5 1Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark; 2Department of Respiratory Medicine, Copenhagen University Hospital - Hvidovre, Hvidovre, Denmark; 3Medical Department, National Hospital of the Faroe Islands, Tórshavn, Faroe Islands; 4Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark; 5The Clinical Institute, Aalborg University, Aalborg, DenmarkCorrespondence: Ulla Møller WeinreichDepartment of Respiratory Diseases, Aalborg University Hospital, Mølleparkvej 4, Aalborg, DK-9000, DenmarkEmail ulw@rn.dkIntroduction: Adherence with controller medication is a major challenge in asthma management. Thus, a reliable method of measurement is mandatory to assess adherence.Aim: To examine the test-retest reliability on adherence with inhaled corticosteroids in adults with asthma using, a self-reported adherence score (Foster score).Methods: Patients with asthma and > 1 routine follow-up appointment at a university hospital outpatient clinic reported Foster scores. The objective Medication Possession Ratio (MPR) was calculated based on pharmacy redemption data and physician-prescribed doses of inhaled corticosteroids. The difference between Foster score and MPR at the first and second visit was assessed using a Bland–Altman plot, outcomes reported as limits of agreements and bias. Foster scores from both visits were used to calculate an intraclass correlation coefficient (ICC).Results: Self-reported adherence with asthma controller medication measured by Foster score was significantly higher than the objective MPR (p < 0.0001). The Bland–Altman plot for MPR and Foster score at the first and second visit showed upper and lower limits of agreement of 83.5 – (− 1.6) and 80.9 – (− 6.9) and bias was 41.0 and 37.0, respectively. Of the included patients, 93.1% reported identical Foster scores between visits, resulting in an excellent ICC of 0.92. Absolute median difference between Foster scores and MPR at first and second visit was 8.7 percentage points (p = 0.049).Conclusion: Foster score shows an excellent ICC; however, its poor agreement with objective measures of adherence suggests that clinicians should not rely on Foster scores alone to assess adherence with inhaled corticosteroids in patients with asthma.Keywords: Foster score, medication possession ratio, controller medication, asthma, self-assessed adherence, self-reported outcome, adherence, persistence

Peter Ascanius Jacobsen,1,2 Kristian Hay Kragholm,2,3 Christian Torp-Pedersen,4 Daisy JA Janssen,5,6 Martijn A Spruit,5,7,8 Ulla Møller Weinreich1,2 1Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark; 2The Clinical Institute, Aalborg University, Aalborg, Denmark; 3Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark; 4Department of Clinical Research, Hillerød Hospital, Hillerød, Denmark; 5Department of Research and Development, Ciro, Horn, the Netherland; 6Department of Health Services Research, Care and Public Health Research Institute, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, the Netherlands; 7Nutrim School of Nutrition and Translational Research in Metabolism, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, the Netherlands; 8Department of Respiratory Medicine, Maastricht University Medical Centre (MUMC+), Maastricht, the NetherlandsCorrespondence: Peter Ascanius JacobsenDepartment of Respiratory Diseases, Aalborg University Hospital, Aalborg, DenmarkTel +45 97 66 48 00Email peter.jacobsen@rn.dkIntroduction: The understanding of whether and to what extent employment status affects readmission and mortality is limited in patients with COPD.Aim: To explore how employment status affects readmission and mortality after first admission to the hospital with acute exacerbation of COPD (AECOPD).Methods: This study used Danish national registry-based data. All patients admitted for the first time to the hospital between 1999 and 2014 with a diagnosis of AECOPD, age 35– 59, without a previous asthma diagnosis were included in the study. Employment status effect on 30-, 90-, and 365-day readmission and mortality was examined using logistic regression, adjusting for relevant confounders.Results: A total of 11,850 COPD patients were included in the study of which 3563 (30%) were working, 1368 (12%) unemployed, 840 (7%) on sick leave, and 6079 (51%) receiving early retirement. Patients receiving early retirement had, compared to patients working, an adjusted increased likelihood of readmission at 30, 90, and 365 days (odds ratio (OR) 1.26 (CI95% (1.06– 1.49)), 1.33 (CI95% (1.16– 1.53)), and 1.48 (CI95% (1.33– 1.66)), respectively). An increased likelihood was also seen in unemployed at 365 days follow-up (OR 1.44 (CI95% (1.22– 1.68))). Early retirement was associated with an increased mortality at 30, 90, and 365 days (OR 1.39 (CI95% (1.07– 1.80)) 1.37 (CI95% (1.09– 1.79)) and 1.48 (CI95% (1.25– 1.75)), respectively). An increased likelihood was also seen in patients receiving sick leave (OR 1.57 (CI95% (1.21– 2.04))).Conclusion: Patients with COPD who are not working at the time of first admission have a higher likelihood of readmission and mortality.Keywords: chronic obstructive pulmonary disease, employment, mortality, readmission

Rina Juel Kaptain,1,2 Tina Helle,1,2 Ann-Helen Patomella,2 Ulla Møller Weinreich,3,4 Anders Kottorp2,5 1Department of Occupational Therapy, University College of Northern Denmark, Aalborg, Denmark; 2Department of Neurobiology, Care Sciences and Society, Division of Occupational Therapy, Karolinska Institutet, Stockholm, Sweden; 3Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark; 4The Clinical Institute, Aalborg University, Aalborg, Denmark; 5Faculty of Health and Society, Malmö University, Malmö, SwedenCorrespondence: Rina Juel Kaptain Selma Lagerloefs Vej 2, Aalborg 9220, DenmarkTel +4572690928Email rio@ucn.dkPurpose: There have been calls for more knowledge of activities of daily living (ADL) performance in order to address interventions in pulmonary rehabilitation effectively. Everyday technology (ET) has become an integrated dimension of ADL, impacting the ways in which ADL is performed. To improve everyday functioning and quality of life, the use of ADL and ET use needs to be evaluated and addressed effectively in interventions. Therefore, the aim of this study was twofold: 1) to explore the quality of ADL performance, and 2) to investigate the relationship between observation and self-reported ADL performance and ability to use everyday technologies in people living with COPD.Methods: This cross-sectional study involved 84 participants aged 46– 87 years. Participants were recruited through healthcare centres in the Northern Region of Denmark using a convenience sampling procedure. Data were collected using standardized assessments that investigated different ADL perspectives: self-reported ADL tasks and ET use, observed motor and process ability, and need for assistance. Data were analysed and presented using descriptive statistics and Pearson’s correlation coefficient.Results: The most affected ADL tasks were mobility within or outside the home, lower dressing, bathing, pedicuring, cooking, shopping, cleaning and washing clothes. New insights into the quality of ADL performance in people living with COPD were presented in terms of detailed ADL motor skills and ADL process skills, as well as the predicted need for support to function in the community. Moreover, new insights into the relationship between observation and self-reported ADL performance (r=0.546, p< 0.01; r=0.297, p< 0.01) and between ADL performance and self-perceived ability to use ET (r=0.524, p< 0.01; r=0.273, p< 0.05; r=0.044, p=0.692) were presented.Conclusion: Overall, the knowledge from the present study is valuable for focusing interventions that address challenging ADL performance and ET use through relevant and realistic activities. The ability to use ET is important to evaluate and target pulmonary rehabilitation.Keywords: ADL skills, AMPS, everyday technology, occupational therapy, pulmonary rehabilitation

Rina Juel Kaptain,1,2 Tina Helle,1,2 Ann-Helen Patomella,2 Ulla Møller Weinreich,3,4 Anders Kottorp2,5 1Department of Occupational Therapy, University College of Northern Denmark, Aalborg, Denmark; 2Department of Neurobiology, Care Sciences and Society, Division of Occupational Therapy, Karolinska Institutet, Stockholm, Sweden; 3Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark; 4The Clinical Institute, Aalborg University, Aalborg, Denmark; 5Faculty of Health and Society, Malmö University, Malmö, SwedenCorrespondence: Rina Juel Kaptain Selma Lagerloefs Vej 2, Aalborg 9220, DenmarkTel +4572690928Email rio@ucn.dkPurpose: A decline in the ability to perform activities of daily living (ADL) and ability to use everyday technology can pose threats to independent living, healthcare management and quality of life (QOL) of patients suffering from chronic obstructive pulmonary disease (COPD). Evidence of the relationship between these variables remains limited. The dual aim of this study was, first, to investigate if health-related QOL (HRQOL) was associated with quality in ADL performance and everyday technology use; second, to examine whether lung function, years with COPD diagnosis, living status or educational level affected physical and mental domains of HRQOL.Methods: This cross-sectional study included (N=80) participants aged 46–87 years recruited at healthcare centres in the Northern Region of Denmark using a convenience sampling procedure. Data were gathered through standardized assessments and analysed using multiple regression analysis.Results: The regression model explained 50.6% (R2=0.506) of the variation in HRQOL–physical. The following four variables were statistically significantly associated with HRQOL – physical: years since COPD diagnosis (p=0.023), ability to use everyday technology (p=0.006), amount of relevant everyday technologies (p=0.015) and ADL motor ability (p

Line Hust Storgaard,1 Hans-Ulrich Hockey,2 Birgitte Schantz Laursen,3,4 Ulla Møller Weinreich1,3 1Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark; 2Biometrics Matters Limited, Hamilton, New Zealand; 3Department of Clinical Medicine, Aalborg University, Aalborg, Denmark; 4Clinical Nursing Research Unit, Aalborg University Hospital, Aalborg, Denmark Background: This study investigated the long-term effects of humidified high-flow nasal cannula (HFNC) in COPD patients with chronic hypoxemic respiratory failure treated with long-term oxygen therapy (LTOT).Patients and methods: A total of 200 patients were randomized into usual care ± HFNC. At inclusion, acute exacerbation of COPD (AECOPD) and hospital admissions 1 year before inclusion, modified Medical Research Council (mMRC) score, St George’s Respiratory Questionnaire (SGRQ), forced expiratory volume in 1 second (FEV1), 6-minute walk test (6MWT) and arterial carbon dioxide (PaCO2) were recorded. Patients completed phone interviews at 1, 3 and 9 months assessing mMRC score and AECOPD since the last contact. At on-site visits (6 and 12 months), mMRC, number of AECOPD since last contact and SGRQ were registered and FEV1, FEV1%, PaCO2 and, at 12 months, 6MWT were reassessed. Hospital admissions during the study period were obtained from hospital records. Hours of the use of HFNC were retrieved from the high-flow device.Results: The average daily use of HFNC was 6 hours/day. The HFNC group had a lower AECOPD rate (3.12 versus 4.95/patient/year, p

Anne Pernille Toft-Petersen,1,2 Christian Torp-Pedersen,1,3 Ulla Møller Weinreich,1,4 Bodil Steen Rasmussen1,2 1Department of Clinical Medicine, Aalborg University, 2Department of Anaesthesia and Intensive Care, 3Department of Clinical Epidemiology, 4Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark Abstract: Low concentrations of hemoglobin have previously been demonstrated in many patients with COPD. There is evidence of anemia as a prognostic factor in acute exacerbations, but the detailed relationship between concentrations of hemoglobin and mortality is not known. A register-based cohort of patients admitted for the first time to Danish hospitals for acute exacerbations of COPD from 2007 through 2012 was established. Age, sex, comorbidities, medication, renal function, and concentrations of hemoglobin were retrieved. Sex-specific survival analyses were fitted for different rounded concentrations of hemoglobin. The cohort encompassed 6,969 patients. Hemoglobin below 130 g/L was present in 39% of males and below 120 g/L in 24% of females. The in-hospital mortality rates for patients with hemoglobin below or above these limits were 11.6% and 5.4%, respectively. After discharge, compared to hemoglobin 130 g/L, the hazard ratio (HR) for males with hemoglobin 120 g/L was 1.45 (95% confidence interval [CI] 1.22–1.73), adjusted HR 1.37 (95% CI 1.15–1.64). Compared to hemoglobin 120 g/L, the HR for females with hemoglobin 110 g/L was 1.4 (95% CI 1.17–1.68), adjusted HR 1.28 (95% CI 1.06–1.53). In conclusion, low concentrations of hemoglobin are frequent in COPD patients with acute exacerbations, and predict long-term mortality. Keywords: pulmonary disease, chronic obstructive, anemia, mortality, polycythemia, epidemiology

Anne Pernille Toft-Petersen,1,2 Christian Torp-Pedersen,1,3 Ulla Møller Weinreich,1,4 Bodil Steen Rasmussen1,2 1Department of Clinical Medicine, Aalborg University, 2Department of Anaesthesia and Intensive Care, Aalborg University Hospital, 3Department of Health, Science and Technology, Aalborg University, Aalborg, 4Department of Respiratory Medicine, Aalborg University Hospital, Denmark Background: In general, previous studies have shown an association between prior exacerbations and mortality in COPD, but this association has not been demonstrated in the subpopulation of patients in need of assisted ventilation. We examined whether previous hospitalizations were independently associated with mortality among patients with COPD ventilated for the first time. Patients and methods: In the Danish National Patient Registry, we established a cohort of patients with COPD ventilated for the first time from 2003 to 2011 and previously medicated for obstructive airway diseases. We assessed the number of hospitalizations for COPD in the preceding year, age, sex, comorbidity, mode of ventilation, survival to discharge, and days to death beyond discharge. Results: The cohort consisted of 6,656 patients of whom 66% had not been hospitalized for COPD in the previous year, 18% once, 8% twice, and 9% thrice or more. In-hospital mortality was 45%, and of the patients alive at discharge, 11% died within a month and 39% within a year. In multivariate models, adjusted for age, sex, mode of ventilation, and comorbidity, odds ratios for in-hospital death were 1.26 (95% confidence interval [CI]: 1.11–1.44), 1.43 (95% CI: 1.19–1.72), and 1.56 (95% CI: 1.30–1.87) with one, two, and three or more hospitalizations, respectively. Hazard ratios for death after discharge from hospital were 1.32 (95% CI: 1.19–1.46), 1.76 (95% CI: 1.52–2.02), and 2.07 (95% CI: 1.80–2.38) with one, two, and three or more hospitalizations, respectively. Conclusion: Preceding hospitalizations for COPD are associated with in-hospital mortality and after discharge in the subpopulation of patients with COPD with acute exacerbation treated with assisted ventilation for the first time. Keywords: pulmonary disease, chronic obstructive, respiration, artificial, patient readmission, hospital mortality, critical care

Sabrina Storgaard Sørensen,1 Kjeld Møller Pedersen,1 Ulla Møller Weinreich,2,3 Lars Holger Ehlers,1 1Danish Center for Healthcare Improvements, Faculty of Social Sciences and Faculty of Health Sciences, Aalborg University, Aalborg East, Denmark; 2Department of Respiratory Medicine, Aalborg University Hospital, Aalborg, Denmark; 3The Clinical Institute, Aalborg University Hospital, Aalborg, Denmark Background: Case management interventions are recommended to improve quality of care and reduce costs in chronic care, but further evidence on effectiveness and cost-effectiveness is needed. The objective of this study is the reporting of the design and participant enrollment of a randomized controlled trial, conducted to evaluate the effectiveness and cost-effectiveness of a community-based case management model for patients suffering from chronic obstructive pulmonary disease (COPD). With a focus on support for self-care and care coordination, the intervention was hypothesized to result in a reduced number of COPD-related hospital admissions. Patients and methods: The design was a randomized controlled trial conducted from 2012 to 2014 with randomization and intervention at patient level. The study took place in Aalborg Municipality, a larger municipality in Denmark. A total of 150 COPD patients were randomized into two groups: the case-managed group and the usual-care group. Participant characteristics were obtained at baseline, and measures on effectiveness and costs were obtained through questionnaires and registries within a 12-month follow-up period. In the forthcoming analysis, effectiveness will be evaluated on COPD-related hospital admissions, mortality, health- related quality of life, and self-care. An economic evaluation will examine the cost-effectiveness of case management against current usual care from the perspective of the health care sector. Results: Baseline characteristics were comparable between the two groups except for the prevalence of cancer, which were borderline significantly higher in the case-managed group. This baseline difference will be adjusted for in the final analysis. A very low dropout rate for the intervention was observed, indicating that the intervention was well accepted. Conclusion: Presented in a forthcoming paper, the results of the study will provide new evidence to the future organization of case management. Keywords: personalized care, disease management, health-related quality of life, cost-effectiveness analysis

Ulla Møller Weinreich,1–3 Lars Pilegaard Thomsen,2 Barbara Bielaska,4 Vania Helbo Jensen,5,6 Morten Vuust,4 Stephen Edward Rees2 1Department of Respiratory Diseases, Aalborg University Hospital, Aalborg, Denmark; 2Respiratory and Critical Care Group (RCARE), Centre for Model-Based Medical Decision Support Systems, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark; 3The Clinical Institute, Aalborg University Hospital, Aalborg, Denmark; 4Department of Radiology, Vendsyssel Hospital, Hjørring, Denmark; 5Department of Radiology, Horsens Regional Hospital, Horsens, Denmark; 6Department of Radiology, Aalborg University Hospital, Aalborg, Denmark Introduction: Patients with chronic obstructive pulmonary disease (COPD) frequently suffer from comorbidities. COPD severity may be evaluated by the Global initiative for chronic ­Obstructive Lung Disease (GOLD) combined risk assessment score (GOLD score). Spirometry, body plethysmography, diffusing capacity of the lung for carbon monoxide (DLCO), and high-resolution computed tomography (HR-CT) measure lung function and elucidate pulmonary pathology. This study assesses associations between GOLD score and measurements of lung function in COPD patients with and without (≤1) comorbidities. It evaluates whether the presence of comorbidities influences evaluation by GOLD score of COPD severity, and questions whether GOLD score describes morbidity rather than COPD severity.Methods: In this prospective study, 106 patients with stable COPD were included. Patients treated for lung cancer were excluded. Demographics, oxygen saturation (SpO2), modified Medical Research Council Dyspnea Scale, COPD exacerbations, and comorbidities were recorded. Body plethysmography and DLCO were measured, and HR-CT performed and evaluated for emphysema and airways disease. COPD severity was stratified by the GOLD score. Correlation analyses: 1) GOLD score, 2) emphysema grade, and 3) airways disease and lung function parameters, described by: forced expiratory volume in the first second in percent of expected value (FEV1%), inspiratory capacity (IC%), total lung volume (TLC%), IC/TLC, and SpO2. Correlation analyses between subgroups and hierarchical cluster analysis were performed.Results: Significant associations were found between GOLD score and both emphysema grade (correlation coefficients [cc]: -0.2, P=0.03) and lung function parameters (cc: -0.5 to -0.7, P-values all 1 comorbidity (cc: -0.4 to -0.5, P-values all 0.001). Significant differences between subgroups were found in GOLD score and both FEV1% (cc: -0.2, P=0.02) and IC/TLC (cc: -0.2, P=0.02). Comorbidities were associated with GOLD score and composite measures in hierarchical cluster analysis. Conclusion: The presence of comorbidities influences the relationship between GOLD score and lung function measurements. GOLD score may be more representative of morbidity than of COPD severity. Keywords: GOLD, diffusing capacity of the lung for carbon monoxide, high resolution computerized tomography, mMRC, total lung capacity, inspiratory capacity

Background: Many patients with chronic obstructive pulmonary disease (COPD) are diagnosed late, e.g., at first acute exacerbation of COPD (AECOPD). AECOPD increases the risk of death. We aim to investigate patient characteristics and mortality across diagnostic settings among patients with COPD., Methods: This nationwide Danish study allocated 107,023 patients with a first-time registered COPD-related hospital contact between 2010 and 2018 based on diagnostic setting: primary care (prior inhalation medication use), hospital outpatient clinic or hospital admission. Multivariable logistic regression was employed to investigate patient characteristics and mortality across these diagnostic settings., Results: In total, 81,035 (75.7 %) patients were diagnosed in primary care, median age 63 years (interquartile range (IQR) 53-71); 11,302 (10.6 %) at an outpatient clinic, median age 68 years (IQR 60-76), and 14,686 (13.7 %) during hospital admission, median age 73 years (IQR 65-81). Patient characteristics associated with diagnosis during hospital admission encompassed age (odds ratio (OR) 1.05, 95 % confidence interval (CI) 1.05-1.05, p < 0.001), male sex (OR 1.14, CI 1.10-1.19, p < 0.001), and number of comorbidities, which increased from one comorbidity (OR 2.64, CI 2.50-2.79, p < 0.001) to six or more comorbidities (OR 12.37, CI 11.26-13.60, p < 0.001). Diagnosis during hospital admission due to AECOPD was associated with increased one-year mortality (OR 1.24, CI 1.16-1.33, p < 0.001) compared to diagnosis in primary care., Conclusion: Patients diagnosed with COPD in hospital settings were generally older, predominantly male, and had more comorbidities. Patients diagnosed in primary care prior to their first AECOPD admission had higher one-year survival., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Ulla Møller Weinreich has received an unrestricted grant from Fisher & Paykel Healthcare for a study, with funds allocated to a hospital account, in the past 36 months. She has also received payments for lectures from AstraZeneca, GSK, ResMed, Fisher & Paykel, Boehringer Ingelheim, Chiesi, and Pfizer. Weinreich is the leader of the Danish Respiratory Society and serves on the Danish Board of Health's Expert Council for Specialty Administration. Christian Torp-Pedersen has received grants from Bayer and Novo Nordisk for study purposes. Johanne Hermann Karlsen has received a grant from Lungeforeningen for study purposes. The other authors declare no conflicts of interest., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Background: Increasing severity of chronic obstructive pulmonary disease (COPD) is associated with increasing risk of poor outcomes. Using health registry data, we aimed to assess the association between treatment intensity levels (TIL), as a proxy for underlying COPD severity, and long-term outcomes., Methods: Using Danish nationwide registries, we identified patients diagnosed with COPD during 2001-2016, who were alive at index date of 1 January 2017. We stratified patients into exclusive TILs from least to most severe: no use, short term therapy, mono-, dual-, triple therapy, oral corticosteroid (OCS), and long-term oxygen treatment (LTOT). Survival analyses were used to assess 5-year outcomes by TIL., Results: We identified 53,803 patients with COPD in the study period (median age: 72 years [inter quartile range, 64-80], 48 % male). The three most severe TILs were associated with a significant incremental increase in all-cause mortality with an adjusted hazard ratio (aHR) for triple therapy, OCS and LTOT of 1.44 (95 % CI: 1.38-1.51), 1.67 (95 % CI: 1.59-1.75), and 2.91 (95 % CI: 2.76-3.07) compared with those receiving no therapy as reference. The same pattern was evident for the composite outcome of 5-year mortality or COPD-related hospitalization with an aHR for triple therapy, OCS and LTOT of 2.30 (95 % CI: 2.22-2.38), 2.85 (95 % CI: 2.74-2.96), and 4.00 (95 % CI: 3.81-4.20), respectively., Conclusion: Increasing TILs were associated with increasing five-year mortality and risk of COPD-related hospitalization. TILs may be used as a proxy for underlying COPD severity in epidemiological studies., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Background: Computed tomography (CT) has an underutilized potential for evaluating body composition in clinical settings. Often conducted with intravenous contrast (IVC), CT scans yield unused body composition data due to unclear effects on skeletal muscle area (SMA), skeletal muscle index (SMI), and muscle density (SMD)., Objectives: This study investigates whether weight-adjusted IVC influences SMA, SMI, and SMD differently in females and males compared with noncontrast abdominal CT. In addition, the study explores associations between contrast and noncontrast-assessed SMA, SMI, SMD, and demographic factors., Methods: A comparative observational retrospective study was conducted on Danish patients who underwent consecutive 4-phased contrast-enhanced abdominal CT scans (noncontrast, arterial, venous, and late venous phases). Muscle measures were evaluated using validated semiautomated threshold-based software by 3 independent raters., Results: The study included 72 patients (51 males and 21 females) with a mean age of 59 (55 and 62) y. Weight-adjusted IVC increased SMA by ≤3.28 cm 2 (95% confidence interval [CI]: 2.58, 3.98) corresponding to 2.4% (1.8, 2.9) in the late venous phase compared with noncontrast CT. Analysis between sexes showed no difference in the effects of IVC on SMA and SMI between females and males. However, females exhibited a higher increase in SMD during the venous by a mean of 1.7 HU (0.9; 2.5) and late venous phases with a mean HU of 1.80 (1.0; 2.6) compared with males. Multivariate regression analysis indicated an association between the differences in SMD and sex during venous (-1.38, 95% CI: -2.48, -0.48) and late venous phases (-1.23, 95% CI: -2.27, -0.19)., Conclusions: Weight-adjusted IVC leads to increased SMA, SMI, and SMD. Although SMA and SMI differences were consistent across the sexes, females exhibited a significantly higher SMD increase than males in the venous and late venous phases. Further investigations are necessary to determine the applicability of SMD as a muscle quality proxy in IVC CT scans., (Copyright © 2024 The Author(s). Published by Elsevier Inc. All rights reserved.)

Background: Little is known about lung function in Inuit. The aim of this study was to describe lung function and the prevalence of obstructive and restrictive lung disease among Inuit in Greenland., Methods: During the 2017-2019 Health Survey, spirometry, with forced expiratory volume in the first second (FEV 1 ), forced vital capacity (FVC), and FEV 1 /FVC ratio in liters (L), and percent of predicted value (pred%) were recorded according to Global Lung function Initiative standard reference values (GLI). Smoking history was obtained. Obstructive spirometry was defined as FEV 1 /FVC <70%. Restrictive spirometry was proposed by FVC < 80% and FEV1/FVC >90%., Results: Based on validated spirometries, 795/2084 persons were included in this cross-sectional, descriptive study. Of those, 54.6% were current- and 27.7% former smokers. In Inuit, normal lung function was higher than predicted GLI (FEV 1 107.2 pred%/FVC 113.5 pred%). In total, 106 (13.3%) were found to have an obstructive lung function measurement and 11 (1.4%) had a restrictive pattern. Among current smokers, the prevalence of obstructive lung function was 16.4%. An accelerated decline in lung function was observed > 50 years old (y.o), compared to <50 y.o., Conclusion: This study indicates that Inuit has higher absolute lung function values than standard GLI, despite the large proportion of smokers, which indicate a need for Inuit reference values in the daily clinical praxis. The high prevalence of obstructive lung function and rapid decline in lung function indicates the need for fucus on health issues that may affect lung health in Greenland., Competing Interests: No potential conflict of interest was reported by the author(s)., (© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

Background: Several methods exist to reduce the number of arterial blood gases (ABGs). One method, Roche v-TAC, has been evaluated in different patient groups. This paper aggregates data from these studies, in different patient categories using common analysis criteria., Research Design and Methods: We included studies evaluating v-TAC based on paired arterial and peripheral venous blood samples. Bland-Altman analysis compared measured and calculated arterial values of pH, PCO 2 , and PO 2 . Subgroup analyses were performed for normal, chronic hypercapnia and chronic base excess, acute hyper- and hypocapnia, and acute and chronic base deficits., Results: 811 samples from 12 studies were included. Bias and limits of agreement for measured and calculated values: pH 0.001 (-0.029 to 0.031), PCO 2 -0.08 (-0.65 to 0.49) kPa, and PO 2 0.04 (-1.71 to 1.78) kPa, with similar values for all sub-group analyses., Conclusion: These data suggest that v-TAC analysis may have a role in replacing ABGs, avoiding arterial puncture. Substantial data exist in patients with chronic hypercapnia and chronic base excess, acute hyper- and hypocapnia, and in patients with relatively normal acid-base status, with similar bias and precision across groups and across study data. Limited data exist for patients with acute and chronic base deficits.

Background: The effect of dual systemic antibiotic therapy against Pseudomonas aeruginosa in patients with pre-existing lung disease is unknown. To assess whether dual systemic antibiotics against P. aeruginosa in outpatients with COPD, non-cystic fibrosis (non-CF) bronchiectasis, or asthma can improve outcomes., Methods: Multicenter, randomised, open-label trial conducted at seven respiratory outpatient clinics in Denmark. Outpatients with COPD, non-CF bronchiectasis, or asthma with a current P. aeruginosa-positive lower respiratory tract culture (clinical routine samples obtained based on symptoms of exacerbation not requiring hospitalisation), regardless of prior P. aeruginosa-status, no current need for hospitalisation, and at least two moderate or one hospitalisation-requiring exacerbation within the last year were eligible. Patients were assigned 1:1 to 14 days of dual systemic anti-pseudomonal antibiotics or no antibiotic treatment. Primary outcome was time to prednisolone or antibiotic-requiring exacerbation or death from day 20 to day 365., Results: The trial was stopped prematurely based in lack of recruitment during the COVID-19 pandemic, this decision was endorsed by the Data and Safety Monitoring Board. Forty-nine outpatients were included in the study. There was a reduction in risk of the primary outcome in the antibiotic group compared to the control group (HR 0.51 (95%CI 0.27-0.96), p = 0.037). The incidence of admissions with exacerbation within one year was 1.1 (95%CI 0.6-1.7) in the dual antibiotic group vs. 2.9 (95%CI 1.3-4.5) in the control group, p = 0.037., Conclusions: Use of dual systemic antibiotics for 14 days against P. aeruginosa in outpatients with chronic lung diseases and no judged need for hospitalisation, improved clinical outcomes markedly. The main limitation was the premature closure of the trial., Trial Registration: ClinicalTrials.gov, NCT03262142, registration date 2017-08-25., (© 2024. The Author(s).)

Background: Anxiety and depression are very common in patients with COPD and may lead to lower quality of life and higher risk of exacerbations and mortality. This study aimed to examine the incidence of anxiety and depression within one year after admission with acute exacerbation in COPD (AECOPD). The secondary aim was to examine the characteristics of the patients who develop anxiety and depression., Methods: This retrospective cohort study used the Danish National Patient Registry. Patients aged 40-90 years admitted for COPD between 01.01.99 and 31.12.18 were included. Patients with mental disorders within 10 years before admission were excluded. Age, sex, educational level, inhaled medication, and comorbidities were evaluated. Anxiety or depression were defined by redemption of anxiolytics or antidepressants within one year after admission., Results: We included 97,929 patients. Anxiolytics and antidepressants were redeemed by 4 and 5 % of patients respectively. Higher age, male sex, treatment with short acting β2-agonists and short acting muscarinic antagonists, cancer and heart failure were positively associated to risk of anxiety or depression, while diabetes and treatment with triple inhalation therapy showed an inverse association., Conclusion: Respectively four and five per cent of patients redeemed anxiolytics and antidepressants within the first year after their first severe AECOPD. Several patient characteristics were significantly associated to risk of anxiety or depression. The results from this study support that there is a risk of anxiety and depression after AECOPD in addition to the known risk of preexisting anxiety and depression., Competing Interests: Declaration of competing interest The authors declare that they have no conflict of interest to disclose., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Introduction: The health effects of alcohol are well established but the influence on pulmonary function remains debated. Studies indicate that small amounts of alcohol are beneficial and heavy consumption is harmful, suggesting a U-shaped association. Our objective is to determine whether there is an association between alcohol intake and changes in pulmonary function parameters, exploring the potential protective effect of moderate alcohol consumption and the harm caused by heavy drinking., Methods: A comprehensive search from PubMed, Embase, Cochrane and CINAHL was carried out, and studies were evaluated using the JBI methodological framework for scoping reviews. Two independent reviewers conducted parallel screening and data extraction. A data extraction form was utilised to organise key themes, with qualitative analysis and visual representation of the results., Results: Among 4427 screened abstracts, 179 underwent full-text review, resulting in 30 eligible studies. Of these, 10 showed a negative effect, nine reported no impact, nine exhibited a positive effect and two indicated a nonlinear U-shaped association between alcohol consumption and pulmonary function parameters., Conclusion: While the U-shaped curve hypothesis remains unconfirmed by the current literature, there are notable associations. Heavy alcohol consumption appears to negatively affect pulmonary function, while low to moderate intake shows a positive influence in included studies. However, the diversity in study quality, the nonstandardised alcohol intake quantification and the confounding role of smoking challenge definitive conclusions. The need for consistent, long-term international studies is evident to further explore this relationship while addressing the complex interplay between alcohol and smoking., Competing Interests: Conflict of interest: S.J. Riddersholm reports grants for post-doctoral employment from GE. U.M. Weinreich reports grants from Fisher & Paykel; lecture honoraria from AstraZeneca, GSK, ResMed, Fisher & Paykel, Orion Pharma, Boehringer Ingelheim and Pfizer; payment for expert testimony from GSK; travel support from Chiesi; advisory board participation for AstraZeneca, GSK, Novartis, TEVA and Boehringer Ingelheim; and leadership roles as Chairman of the Danish Respiratory Society, Chairman of the Lungeforeningens Research Grant, outside the submitted work. All other authors have nothing to disclose., (Copyright ©The authors 2024.)

Background and Aims: Inflammatory bowel disease (IBD) is associated with disease manifestations in organs other than the gastrointestinal tract. In this study, we aimed to estimate the odds of obstructive lung disease (OLD) before IBD onset and the risk of OLD after IBD onset., Methods: In a nationwide population-based Danish cohort study from 1999 to 2018, individuals with IBD and OLD were identified using the Danish registries. Between 2003 and 2013, 24,238 individuals with IBD were identified and matched 1:10 with non-IBD individuals. Logistic regression was used to estimate the prevalence odds ratio for OLD before IBD onset. Time-to-event analysis was performed to explore the risk of OLD after IBD onset. In a sensitivity analysis, the time-to-event analysis was repeated using the composite outcome OLD and the separate outcomes, chronic obstructive pulmonary disease (COPD), asthma, and bronchiectasis., Results: Individuals with IBD were 60% more likely to have OLD before onset (adjusted odds ratio: 1.60, 95% confidence interval [CI]: 1.53-1.67). Furthermore, their risk of OLD was more than 40% higher after IBD diagnosis (adjusted hazard ratio [aHR]: 1.43, 95% CI: 1.37-1.49). The sensitivity analysis increased the risk to 60% (aHR: 1.63, 95% CI: 1.53-1.73). Similar results were found for COPD and asthma separately, whereas the risk of bronchiectasis increased more than 2-fold (aHR: 2.44, 95% CI: 1.91-3.11)., Conclusion: The odds of OLD before- and the risk following an IBD diagnosis were increased. We encourage physicians to be vigilant of pulmonary symptoms in persons with IBD and gastrointestinal symptoms in individuals with OLD., (© 2024 The Authors. United European Gastroenterology Journal published by Wiley Periodicals LLC on behalf of United European Gastroenterology.)

Introduction: In patients with chronic obstructive pulmonary disease (COPD), loneliness and social isolation are associated with increased morbidity and decreased mobility, self-reliance, and health-related quality of life. Social support has been shown to improve these outcomes., Aims: This cross-sectional study aimed to investigate the level of experienced social support and the clinical outcomes associated with inadequate social support among patients with COPD with a resident loved one., Methods: Level of social support was assessed with the Medical Outcomes Study - Social Support Survey (MOS-SSS) in patients with COPD with a resident loved one. Patients were sub-grouped into adequate or inadequate social support. Multiple clinical outcomes were assessed, including lung function, degree of dyspnoea, health status, symptoms of anxiety and depression, the degree of care dependency, functional status, and mobility., Results: The study included 191 Dutch patients with COPD (53.4% men, age: 65.6 ± 8.9 years, FEV 1 : 47.3 ± 17.7% predicted). Eighteen percent of the patients reported inadequate social support. Patients with inadequate social support reported a significantly symptom severity of COPD (p = 0.004), a higher care dependency level (p = 0.04) and a higher level of depression (p = 0.004) compared to patients with adequate social support. Other traits were comparable for both groups., Conclusion: Patients with COPD with a resident loved one who perceive an inadequate level of social support are more likely to report a higher impact of COPD, a higher care dependency and symptoms of depression. Other characteristics are comparable with patients who perceive adequate social support., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Background: Oxygen supplementation is ubiquitous in intensive care unit (ICU) patients with chronic obstructive pulmonary disease (COPD) and acute hypoxaemia, but the optimal oxygenation target has not been established., Methods: This was a pre-planned subgroup analysis of the Handling Oxygenation Targets in the ICU (HOT-ICU) trial, which allocated patients with acute hypoxaemia to a lower oxygenation target (partial pressure of arterial oxygen [ P ao 2 ] of 8 kPa) vs a higher target ( P ao 2 of 12 kPa) during ICU admission, for up to 90 days; the allocation was stratified for presence or absence of COPD. Here, we report key outcomes for patients with COPD., Results: The HOT-ICU trial enrolled 2928 patients of whom 563 had COPD; 277 were allocated to the lower and 286 to the higher oxygenation group. After allocation, the median P ao 2 was 9.1 kPa (inter-quartile range 8.7-9.9) in the lower group vs 12.1 kPa (11.2-12.9) in the higher group. Data for arterial carbon dioxide ( P aco 2 ) were available for 497 patients (88%) with no between-group difference in time-weighted average; median P aco 2 6.0 kPa (5.2-7.2) in the lower group vs 6.2 kPa (5.4-7.3) in the higher group. At 90 days, 122/277 patients (44%) in the lower oxygenation group had died vs 132/285 patients (46%) in the higher (relative risk 0.98; 95% confidence interval 0.82-1.17; P =0.67). No statistically significant differences were found in any secondary outcome., Conclusions: In ICU patients with COPD and acute hypoxaemia, a lower vs a higher oxygenation target did not reduce mortality. There were no between-group differences in P aco 2 or in secondary outcomes., Clinical Trial Registration: NCT03174002, EudraCT number 2017-000632-34., (© 2024 The Authors.)

Telemedicine is emerging and has both clinical, scientific, and political interest. In this review, we present the present literature on implementation and describe the economic considerations when implementing telemedicine in chronic obstructive pulmonary disease (COPD). The use of telemedicine in COPD is well-received by patients, but there is little evidence to suggest its superiority to standard outpatient care or to support better outcomes for patients. Thus, local settings and cost effectiveness should be considered during the implementational process., (Published under Open Access CC-BY-NC-BD 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/.)

This review provides an overview of home-based respiratory support modalities for patients with chronic lung diseases. It discusses the increasing use of long-term high-flow nasal cannula (LT-HFNC) and long-term non-invasive ventilation (LT-NIV) and their potential to enhance patient quality of life. This review addresses various types of respiratory failure and their respective treatments, emphasising the significance of monitoring and telemedicine in home care. This comprehensive review underscores the clinical relevance of these interventions in the management of chronic lung diseases., (Published under Open Access CC-BY-NC-BD 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/.)

Background: The Handling Oxygenation Targets in the Intensive Care Unit (HOT-ICU) trial was a multicentre, randomised, parallel-group trial of a lower oxygenation target (arterial partial pressure of oxygen [PaO 2 ] = 8 kPa) versus a higher oxygenation target (PaO 2  = 12 kPa) in adult ICU patients with acute hypoxaemic respiratory failure; the Handling Oxygenation Targets in coronavirus disease 2019 (HOT-COVID) tested the same oxygenation targets in patients with confirmed COVID-19. In this study, we aim to evaluate the long-term effects of these oxygenation targets on cognitive and pulmonary function. We hypothesise that a lower oxygenation target throughout the ICU stay may result in cognitive impairment, whereas a higher oxygenation target may result in impaired pulmonary function., Methods: This is the updated protocol and statistical analysis plan of two pre-planned secondary outcomes, the long-term cognitive function, and long-term pulmonary function, in the HOT-ICU and HOT-COVID trials. Patients enrolled in both trials at selected Danish sites and surviving to 1 year after randomisation are eligible to participate. A Repeatable Battery for the Assessment of Neuropsychological Status score and a full-body plethysmography, including diffusion capacity for carbon monoxide, will be obtained. The last patient is expected to be included in the spring of 2024., Conclusion: This study will provide important information on the long-term effects of a lower versus a higher oxygenation target on long-term cognitive and pulmonary functions in adult ICU patients with acute hypoxaemic respiratory failure., (© 2024 The Authors. Acta Anaesthesiologica Scandinavica published by John Wiley & Sons Ltd on behalf of Acta Anaesthesiologica Scandinavica Foundation.)

Background: Patients with chronic obstructive pulmonary disease (COPD) with low skeletal muscle mass and severe airway obstruction have higher mortality risks. However, the relationship between dynamic/static lung function (LF) and thoracic skeletal muscle measurements (SMM) remains unclear. This study explored patient characteristics (weight, BMI, exacerbations, dynamic/static LF, sex differences in LF and SMM, and the link between LF and SMM changes., Methods: A retrospective analysis of a 12-month prospective follow-up study patients with stable COPD undergoing standardized treatment, covering mild to severe stages, was conducted. The baseline and follow-up assessments included computed tomography and body plethysmography., Results: This study included 35 patients (17 females and 18 males). This study revealed that females had more stable LF but tended to have greater declines in SMM areas and indices than males (-5.4% vs. -1.9%, respectively), despite the fact that females were younger and had higher LF and less exacerbation than males. A multivariate linear regression showed a negative association between the inspiratory capacity/total lung capacity ratio (IC/TLC) and muscle fat area., Conclusions: The findings suggest distinct LF and BC progression patterns between male and female patients with COPD. A low IC/TLC ratio may predict increased muscle fat. Further studies are necessary to understand these relationships better.

There is a Danish Christmas tune indicating that Santa can cause traffic hazards. The question is, however, whether there are other dangers associated with closer contacts to reindeers during Christmas. A literature search reveals a need for cautiousness, should one be tempted to try to get a glimpse of - or even to pad - Rudolph on the back on Christmas Eve., (Published under Open Access CC-BY-NC-BD 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/.)

Patients with end-stage chronic obstructive pulmonary disease (COPD) often develop persistent hypoxic or hypercapnic respiratory failure, or a combination of both. Ventilatory support, in terms of a long-term high-flow nasal cannula (LT-HFNC) and long-term non-invasive ventilation (LT-NIV), may be indicated. Often, clinicians choose either one or the other. This paper explores combined treatment with LT-HFNC and LT-NIV in a real-life setting. In total, 33 patients with COPD and persistent respiratory failure were included in this study. Of those, 17 were initiated on LT-HFNC and used it for 595 (374) days and 16 were initiated on LT-NIV and used it for 558 (479) days. On average, patients used respiratory support continuously for 908 (586) days. Baseline characteristics were comparable, apart from PaCO 2 at first ventilatory support initiation (LT-HFNC/LT-NIV 7.1 (1.1) kPa/8.8 (0.9) kPa respectively ( p = 0.002)). Both groups experienced a reduction in hospitalizations in the first twelve months after treatment initiation, compared to the twelve months before (LT-HFNC p = 0.022 and LT-NIV p = 0.014). In total, 25% of LT-NIV patients stopped treatment after HFNC initiation due to intolerance and 59% stopped LT-HFNC treatment 126 (36) days after LT-NIV initiation as monotherapy was sufficient. In 44% of these patients, LT-HFNC was re-initiated at the end of life. At the time of analysis, 70% of patients had died. In the last three months of life, patients stopped using LT-NIV, whereas 91% used LT-HFNC. In conclusion, the combined use of LT-NIV and LT-HFNC reduced hospitalizations in patients with COPD and persistent respiratory failure. The study indicates that LT-HFNC is well tolerated, and better tolerated than LT-NIV at the very end stages of COPD.

Background: Computed tomography (CT) is increasingly used in the clinical workup, and existing scan contains unused body composition data, potentially useful in a clinical setting. However, there is no healthy reference for contrast-enhanced thoracic CT-derived muscle measures. Therefore, we aimed at investigating whether there is a correlation between each of the thoracic and third lumbar vertebra level (L3) skeletal muscle area (SMA), skeletal muscle index (SMI), and skeletal muscle density (SMD) at contrast-enhanced CT in patients without chronic disease., Methods: A proof-of-concept retrospective observational study was based on Caucasian patients without chronic disease, who received CT for trauma between 2012 and 2014. Muscle measures were assessed using a semiautomated threshold-based software by two raters independently. Pearson's correlation between each thoracic level and third lumbar and intraclass correlation between two raters and test-retest with SMA as proxy parameters were used., Results: Twenty-one patients (11 males, 10 females; median age 29 years) were included. The second thoracic vertebra (T2) had the highest median of cumulated SMA (males 314.7 cm 2 , females 118.5 cm 2 ) and SMI (97.8 cm 2 /m 2 and 70.4 cm 2 /m 2 , respectively). The strongest SMA correlation was observed between T5 and L3 (r = 0.970), the SMI between T11 and L3 (r = 0.938), and the SMD between the T10 and L3 (r = 0.890)., Conclusions: This study suggests that any of the thoracic levels can be valid to assess skeletal muscle mass. However, the T5 may be most favourable for measuring SMA, the T11 for SMI, and T10 for SMD when using contrast-enhanced thoracic CT., Relevance Statement: In COPD patients, a CT-derived thoracic muscle mass assessment may help identify who would benefit from focused pulmonary rehabilitation: thoracic contrast-enhanced CT conducted as part of the standard clinical workup can be used for this evaluation., Key Points: • Any thoracic level can be used to assess thoracic muscle mass. • Thoracic level 5 is strongly associated with the 3rd lumbar muscle area. • A strong correlation between the thoracic level 11 and the 3rd lumbar muscle index. • Thoracic level 10 is strongly associated with the 3rd lumbar muscle density., (© 2023. The Author(s).)

Background: During the first weeks of the outbreak of the coronavirus disease 2019 (COVID-19), the North Denmark emergency medical services authorised paramedics to assess patients suspected of COVID-19 at home, and then decide if conveyance to a hospital was required. The aim of this study was to describe the cohort of patients who were assessed at home and their outcomes in terms of subsequent hospital visits and short-term mortality., Methods: This was a historical cohort study in the North Denmark Region with consecutive inclusion of patients suspected of COVID-19 who were referred to a paramedic's assessment visit by their general practitioner or an out-of-hours general practitioner. The study was conducted from 16 March to 20 May 2020. The outcomes were the proportion of non-conveyed patients who subsequently visited a hospital within 72 hours of the paramedic's assessment visit and mortality at 3, 7 and 30 days. Mortality was estimated using a Poisson regression model with robust variance estimation., Results: During the study period, 587 patients with a median age of 75 (IQR 59-84) years were referred to a paramedic's assessment visit. Three of four patients (76.5%, 95% CI 72.8;79.9) were non-conveyed, and 13.1% (95% CI 10.2;16.6) of the non-conveyed patients were subsequently referred to a hospital within 72 hours of the paramedic's assessment visit. Within 30 days from the paramedic's assessment visit, mortality was 11.1% [95% CI 6.9;17.9] among patients directly conveyed to a hospital and 5.8% [95% CI 4.0;8.5] among non-conveyed patients. Medical record review revealed that deaths in the non-conveyed group had happened among patients with 'do-not-resuscitate' orders, palliative care plans, severe comorbidities, age ≥ 90 years or nursing home residents., Conclusions: The majority (87%) of the non-conveyed patients did not visit a hospital for the following three days after a paramedic's assessment visit. The study implies that this newly established prehospital arrangement served as a kind of gatekeeper for the region's hospitals in regard to patients suspected of COVID-19. The study also demonstrates that implementation of non-conveyance protocols should be accompanied by careful and regular evaluation to ensure patient safety., (© 2023. The Author(s).)

Introduction: Long-term High Flow Nasal Cannula (LT-HFNC), defined as High Flow Nasal Cannula treatment provided to patients with chronic pulmonary conditions during stable phases, has emerged as a home treatment in different categories of patients with chronic lung diseases in recent years., Methods: This paper summarizes the physiological effects of LT-HFNC and evaluates the clinical knowledge to date about treatment in patients with chronic obstructive lung disease, interstitial lung disease and bronchiectasis. The guideline is translated and summarized in this paper and presented unabridged as an appendix to the paper., Results: The paper describes the working process behind the Danish Respiratory Society's National guideline for treatment of stable disease, which has been written to support clinicians in both evidence-based decision making and practical issues concerning the treatment., Competing Interests: Line Hust Storgaard has received funding for research and speaker’s fees from Fisher&Paykel Healthcare, and speaker’s fees from ResMed.Ulla Møller Weinreich has received funding for research and speaker’s fees from Fisher&Paykel Healthcare, and speaker’s fees and fees for advisory board participation from ResMed., (© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

Background: Hospital admissions are important contributors to the overall burden of chronic obstructive pulmonary disease (COPD). Understanding the patterns and causes of hospital admissions will help to identify targets for preventive interventions. This study aimed to determine the 5-year all-cause hospital admission trajectories of patients with COPD following their first ever exacerbation-related hospitalisation., Methods: Patients with COPD were identified from the Danish national registries. Patients experiencing their first ever exacerbation-related hospitalisation, defined as the index event, between 2000 and 2014 were included. All-cause hospital admissions were examined during a subsequent 5-year follow-up period, and categorised using the International Classification of Diseases, 10th revision., Results: In total, 82 964 patients with COPD were included. The mean±sd age was 72±10 years and 48% were male. Comorbidities were present in 58%, and 65% of the patients collected inhalation medication ≤6 months prior to the index event. In total, 337 066 all-cause hospital admissions were identified, resulting in a 5-year admission rate of 82%. Most admissions were due to nonrespiratory causes (59%), amongst which cardiac events were most common (19%)., Conclusion: Hospital admissions following a first exacerbation-related hospitalisation are common; nonrespiratory events constitute the majority of admissions. Besides the respiratory causes, treatment targeting the nonrespiratory causes of hospital admission should be considered to effectively decrease the burden of hospitalisation in COPD., Competing Interests: Conflict of interest: S.O. Simons has received grants and personal fees from AstraZeneca, Boehringer Ingelheim, GlaxoSmithKline and Chiesi outside the submitted work. F.M.E. Franssen has received grants and personal fees from AstraZeneca, Chiesi, Boehringer Ingelheim, Glaxosmithkline, Novartis and MSD outside the submitted work. M.A. Spruit has received grants and personal fees from the Netherlands Lung Foundation, Stichting Asthma Bestrijding, AstraZeneca, Boehringer Ingeheim, TEVA and CHIESI outside the submitted work. C.T. Pedersen has received grants from Bayer and Novo Nordisk outside the submitted work. All authors declare no conflicts of interest in relation to the present study., (Copyright ©The authors 2023.)

Background: There is an urgent need for early detection of lung cancer. Screening with low-dose computed tomography (LDCT) is now implemented in the US. Supplementary use of a lung cancer biomarker with high specificity is desirable., Objective: To assess the diagnostic properties of a biomarker panel consisting of cytokeratin 19 fragment (CYFRA 21-1), carcinoembryonic antigen (CEA) and cancer antigen 125 (CA125)., Methods: A cohort of 250 high-risk patients was investigated on suspicion of lung cancer. Ahead of diagnostic work-up, blood samples taken. Cross-validated prediction models were computed to assess lung cancer detection properties., Results: In total 32% (79/250) of patients were diagnosed with lung cancer. Area under the curve (AUC) for the three biomarkers was of 0.795, with sensitivity/specificity of 57%/93% and negative predictive value of 83%. When combining the biomarkers with US screening criteria, the AUC was 0.809, while applying only US screening criteria on the cohort, yielded an AUC of 0.62. The ability of the biomarkers to detect stage I-II lung cancer was substantially lower; AUC 0.54., Conclusions: In a high-risk cohort, the detection properties of the three biomarkers were acceptable compared to current LDCT screening criteria. However, the ability to detect early stage lung cancer was low.

Background: Tuberculosis (TB) prevalence is high among socially marginalized citizens in Denmark, and management of latent TB infection (LTBI) may be part of preventing new cases. Patients with LTBI are offered either preventive treatment (TPT) or follow-up chest x-rays, but knowledge about the long-term outcome in terms of active TB is sparse., Methods: We performed a retrospective cohort study investigating the long-term outcomes for socially marginalized citizens who were diagnosed with LTBI or who had a positive interferon-gamma release assay (IGRA) but were lost to follow-up. Information on TB examinations, diagnostics, and treatment along with data on death were gathered from medical records from the date of positive IGRA to February 1, 2021., Results: We identified 119 patients with LTBI, 18 of which (15.1%) were diagnosed with TB during the follow-up period (mean, 4.5 years). TPT was completed by 36.1% and the TB incidence rate ratio of those completing TPT to those who did not was 0.78 (confidence interval, 0.25-2.17; P =.6). Of the patients with TB, 16 of 18 achieved treatment success., Conclusion: High rates of TB development are found among socially marginalized citizens with LTBI. Overall incidence of TB was not significantly reduced by administration of TPT, although TB did not develop in the first 2 years following TPT., Competing Interests: Conflict of interest statement The authors have no conflict of interest with regard to this work., (Copyright © 2022 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Background: Computed tomography (CT) examinations are increasingly used worldwide and incidental findings are growing likewise. Lung cancer stage at diagnosis is pivotal to survival. The earliest stage of lung cancer, stage IA is in most cases asymptomatic. Potentially, increased use of clinical CTs could induce a stage shift toward earlier lung cancer diagnosis., Materials and Methods: Data on the number of CT thorax in Denmark and the stage distribution of Danish lung cancer patients 2013-2020 were acquired from, respectively, the Danish Health Data Authority and the Danish Lung Cancer Registry. Clinical auditing of stage IA lung cancer patients was performed in the period 2019-2021 in a Danish region to assess the reasons for referral. Auditing of stage IV lung cancer patients was done to see whether a CT thorax was performed in a two-year period before diagnosis., Results: All regions showed an increase in CTs per 1000 inhabitants. However, the number of CTs performed in 2013 differed by more than 50% among regions, and the increase per year also differed, from an increase of 1.9 to 3.4 more examinations per year. A significant correlation between CTs and fraction of stage IA lung cancers was seen in four out of the five regions. The audit of stage IA lung cancer cases revealed that 86.8% were incidental findings. Audit of stage IV lung cancer found that 4.3% had a nodule/infiltrate on a previous CT within a 2-year period prior to the diagnosis of lung cancer that was the probable origin of stage IV lung cancer., Conclusion: The study found that the vast majority of early-stage lung cancers were incidental findings. It highlights that follow-up algorithms of incidental findings should be used in accordance with guidelines and it should be unequivocally how the CT follow-up of pulmonary infiltrates is managed.

Objective: This study explores how the choice of voluntary early retirement (VER) affects mortality in a population where VER is available 5 years before regular retirement age., Study Design: This retrospective cohort study uses a registry-based follow-up design with access to Nationwide Danish Registry Data., Methods: The study includes all Danish individuals who between 2000 and 2015 were part of an unemployment insurance fund and working at the time of their 60th (P60) or 62nd (P62) birthday. Those alive 1 year from their 60th or 62nd birthday were included in the mortality analysis. Individuals were registered as VER recipients if they chose the benefit within 1 year from P60 or P62. Three-year mortality likelihood following the first year from inclusion was explored for both cohorts separately. Multiple subgroups were explored in the mortality analysis, including individuals with chronic obstructive pulmonary disease (COPD), heart failure, and diabetes., Results: P60 included 627,278 individuals, and VER was chosen by 22.5%. P62 included 379,196 individuals, and VER was chosen by 33.4%. The likelihood of VER in the P60 was lower in healthy individuals (odds ratio [OR] 0.87, confidence interval [CI] 0.85-0.88) and higher in COPD (OR 1.15, CI 1.07-1.22) and heart failure patients (OR 1.15, CI 1.05-1.25). Three-year mortality was significantly higher in those choosing VER in P60 (OR 1.28, CI 1.22-1.34), which was also found for all health subgroups (healthy, OR 1.18, CI 1.07-1.30; COPD, OR 1.55, CI 1.16-2.07; heart failure, OR 1.42, CI 1.02-1.98; diabetes, OR 1.36, CI 1.12-1.65). The increased mortality risk was not found in the P62 cohort., Conclusion: The choice of VER is more likely in patients with COPD and heart failure. VER in the P60 cohort is associated with an increased mortality likelihood, which was not found in the P62 cohort, which may be explained by health selection bias., (Copyright © 2022 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

Background: Pseudomonas aeruginosa infection is seen in chronic pulmonary disease and is associated with exacerbations and poor long-term prognosis. However, evidence-based guidelines for the management and treatment of P. aeruginosa infection in chronic, non-cystic fibrosis (CF) pulmonary disease are lacking. The aim of this study is to investigate whether targeted antibiotic treatment against P. aeruginosa can reduce exacerbations and mortality in patients with chronic obstructive pulmonary disease (COPD), non-CF bronchiectasis, and asthma., Methods: This study is an ongoing multicenter, randomized, controlled, open-label trial. A total of 150 patients with COPD, non-CF bronchiectasis or asthma, and P. aeruginosa-positive lower respiratory tract samples will be randomly assigned with a 1:1 ratio to either no antibiotic treatment or anti-pseudomonal antibiotic treatment with intravenous beta-lactam and oral ciprofloxacin for 14 days. The primary outcome, analyzed with two co-primary endpoints, is (i) time to prednisolone and/or antibiotic requiring exacerbation or death, in the primary or secondary health sector, within days 20-365 from study allocation and (ii) days alive and without exacerbation within days 20-365 from the study allocation., Discussion: This trial will determine whether targeted antibiotics can benefit future patients with chronic, non-CF pulmonary disease and P. aeruginosa infection in terms of reduced morbidity and mortality, thus optimizing therapeutic approaches in this large group of chronic patients., Trial Registration: ClinicalTrials.gov NCT03262142 . Registered on August 25, 2017., (© 2022. The Author(s).)

Approximately 7% of all dispatched ambulances in Denmark are for patients for whom breathing difficulties are the main cause for using ambulance services. Objective measurements are routinely carried out in the ambulances, but little is known of the patients' subjective experience of dyspnea. The purpose of this study was to investigate how patients with acute dyspnea, transported to hospital by ambulance, experience their situation, along with their experience of the use of a dyspnea scale. The study was carried out in the North Denmark Region. Transcribed patient interviews and field notes were analyzed and interpreted with inspiration from Paul Ricoeur. For interviews, we included 12 patients with dyspnea who were transported to the hospital by ambulance: six women and six men all aged 60 years or above. Observations were made over six ambulance transports related to dyspnea. Three themes emerged: "anxiety", "reassurance in the ambulance" and "acceptance of the dyspnea measurements in the ambulance". Several patients expressed anxiety due to their dyspnea, which was substantiated by observations in the ambulance. The patients expressed different perspectives on what improved the situation (treatment, reassurance by ambulance professionals). The patients and the ambulance personnel were, in general, in favor of the dyspnea scale.

Objective: Natural killer (NK) cells play an essential role in the immune response against cancer. However, immune escape mechanisms may cause inferior NK cell activity (NKA) in patients with cancer. This prospective study examined the relationship between NKA and lung cancer in a high-risk cohort., Methods: In a cohort study, 250 participants referred by their general practitioner for suspicion of lung cancer were included. Before clinical investigation, blood was collected into NK Vue tubes, and the level of interferon gamma after 24 hours served as a surrogate marker for NKA., Results: Among 250 patients, 79 were diagnosed with lung cancer. No difference in NKA was found between patients with lung cancer and control participants in which lung cancer was ruled out (median 226 pg/mL vs. 450 pg/mL). However, there was a significant difference in NKA between patients with late-stage lung cancer and controls (median 161 pg/mL vs. 450 pg/mL). A linear regression model showed that NKA was not influenced by age, sex or smoking status., Conclusions: The significantly lower NKA in patients with late-stage lung cancer warrants further investigation combining NKA with other biomarkers and examining the potential role of NKA as a marker of disseminated disease.

Background: Denmark is a low-incidence country for tuberculosis (TB) and multidrug-resistant (MDR) TB at 5 and 0.05 cases per 100,000 population, respectively. Until 2018, the transmission of MDR-TB was nonexistent except for a few pairwise related family cases. In this study, we describe the first MDR-TB outbreak in Denmark., Methods: On the basis of genotyping of all Mycobacterium tuberculosis (Mtb) culture-positive cases in Denmark spanning 3 decades, 6 molecular- and epidemiologically linked Danish-born cases were identified as the first cluster of an MDR-TB in Denmark. The primary case was diagnosed posthumously in 2010 followed by 5 epidemiologically linked cases from 2018 to 2019., Results and Conclusion: Through a combination of routine Mtb genotyping and clinical epidemiological surveillance data, we identified the first Danish MDR-TB outbreak spanning 10 years and were able to disclose the specific transmission pathways in detail, which helped guide the outbreak investigations. The occurrence of an MDR-TB outbreak in a resource-rich low TB incidence setting such as Denmark highlights the importance of a collaborative control system combining classic contact tracing; timely identification of drug-resistant TB through rapid diagnostics; and a close collaboration between clinicians and classical- and molecular epidemiologists for the benefit of TB control., Competing Interests: Declaration of Competing Interest There are no conflicts of interest to declare pertaining to this work., (Copyright © 2022 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

Social distancing measures introduced on March 12, 2020, in Denmark during the COVID-19 pandemic may affect non-COVID-19 admissions for severe acute exacerbation of chronic obstructive pulmonary disease (s-AECOPD). We compared rates of s-AECOPD in a nationwide, observational, semi-experimental cohort study using data from all Danish inhabitants between calendar week 1 through 25 in 2019 and 2020. In a sub-cohort of patients with chronic obstructive pulmonary disease, we examined incidence of s-AECOPD, admissions to an intensive care unit, and all-cause mortality. A total of 3.0 million inhabitants aged ≥40 years, corresponding to 3.0 million person-years, were followed for s-AECOPD. In the social distancing period in 2020, there were 6,212 incidents of s-AECOPD, compared with 11,260 incidents in 2019, resulting in a 45% relative risk reduction. In the cohort with chronic obstructive pulmonary disease (n = 16,675), we observed a lower risk of s-AECOPD in the social distancing period (subdistribution hazard ratio (HR) = 0.34, 95% confidence interval (CI): 0.33, 0.36; absolute risk: 25.4% in 2020 and 42.8% in 2019). The risk of admissions to an intensive care unit was reduced (subdistribution HR = 0.64, 95% CI: 0.47, 0.87), as was all-cause mortality (HR = 0.83, 95% CI: 0.76, 0.90). Overall, the social distancing period was associated with a significant risk reduction for hospital admittance with s-AECOPD., (© The Author(s) 2022. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Objectives: This study aimed to explore return to work after COVID-19 and how disease severity affects this., Study Design: This is a Nationwide Danish registry-based cohort study using a retrospective follow-up design., Methods: Patients with a first-time positive SARS-CoV-2 polymerase chain reaction test between 1 January 2020 and 30 May 2020, including 18-64 years old, 30-day survivors, and available to the workforce at the time of the first positive test were included. Admission types (i.e. no admission, admission to non-intensive care unit [ICU] department and admission to ICU) and return to work was investigated using Cox regression standardised to the age, sex, comorbidity and education-level distribution of all included subjects with estimates at 3 months from positive test displayed., Results: Among the 7466 patients included in the study, 81.9% (6119/7466) and 98.4% (7344/7466) returned to work within 4 weeks and 6 months, respectively, with 1.5% (109/7466) not returning. Of the patients admitted, 72.1% (627/870) and 92.6% (805/870) returned 1 month and 6 months after admission to the hospital, with 6.6% (58/870) not returning within 6 months. Of patients admitted to the ICU, 36% (9/25) did not return within 6 months. Patients with an admission had a lower chance of return to work 3 months from positive test (relative risk [RR] 0.95, 95% confidence interval [CI] 0.94-0.96), with the lowest chance in patients admitted to an ICU department (RR 0.54, 95% CI 0.35-0.72). Female sex, older age, and comorbidity were associated with a lower chance of returning to work., Conclusion: Hospitalised patients with COVID-19 infection have a lower chance of returning to work with potential implications for postinfection follow-up and rehabilitation., (Copyright © 2021 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Background: Although supplemental oxygen can be lifesaving, liberal oxygen administration causing hyperoxaemia may be harmful. The targets for oxygenation in patients with acute hypoxaemic respiratory failure acutely admitted to the intensive care unit (ICU) are strongly debated, and consensus on which targets to recommend has not been reached. The Handling Oxygenation Targets in the ICU (HOT-ICU) trial is a multicentre, randomised, parallel-group trial of a lower oxygenation target (arterial partial pressure of oxygen [PaO 2 ] = 8 kPa) versus a higher oxygenation target (PaO 2  = 12 kPa) in adult ICU patients with acute hypoxaemic respiratory failure. In this study, we aim to evaluate the effects of these targets on long-term cognitive and pulmonary function in Danish patients, enrolled in the HOT-ICU trial and surviving to 1-year follow-up. We hypothesise that a lower oxygenation target throughout the ICU stay may result in cognitive impairment, whereas a higher oxygenation target may result in impaired pulmonary function., Methods: All patients enrolled in the HOT-ICU trial at Danish sites and surviving to 1 year after randomisation are eligible to participate. The last patient is expected to be included by November 2021. A Repeatable Battery for the Assessment of Neuropsychological Status and a body plethysmography, including diffusion capacity for carbon monoxide, both pre-planned secondary long-term outcomes of the HOT-ICU trial, will be obtained., Conclusion: This study will provide important information on the long-term effects of a lower versus a higher oxygenation target on cognitive and pulmonary function in adult ICU patients with acute hypoxaemic respiratory failure., (© 2021 The Acta Anaesthesiologica Scandinavica Foundation. Published by John Wiley & Sons Ltd.)

The anti-inflammatory effect of systemic corticosteroid (CS) on obstructive lung diseases and seasonal allergic rhinitis is well known. So are the physiological side-effects of CS. A major development in inhalation and biologic treatment as well as hyposensibilisation has taken place in recent years and evidence of personalized use of CS in acute exacerbations increases. We review the side effects of CS and the rationale for use of systemic CS in treatment of obstructive lung diseases as asthma and COPD, as well as seasonal allergic rhinitis.

Introduction: Interstitial Lung Diseases (ILD) affect the lung parenchyma and are often complicated by respiratory failure (RF) and impaired physical activity. High Flow Nasal Cannula (HFNC) has proved effective in other disease entities with RF. The aim of this study is to investigate the effect of domiciliary HFNC in ILD on dyspnea and walking distance., Methods: A 6 weeks cross-over study with domiciliary HFNC-treatment/6 weeks' observation in ILD-patients requiring ambulatory oxygen therapy or with newly prescribed (within 12 months) long term oxygen therapy. Patients were advised to use HFNC 8 h/day, recommended night-time use. Body phletysmography; 6-min walk test (6MWT) including BORG-score, oxygen saturation (SO 2 ) at start, minimum SO 2 and time to recovery after 6MWT; arterial blood gasses; modified Medical Research Council (mMRC)-score; quality of life, by the St George Respiratory Questionnaire (SGRQ) and QoS, by the Richards-Campbell Sleep Questionnaire (RCSQ) were investigated at baseline; six weeks and 12 weeks., Results: 10 patients were included; one later withdrew consent. Patients used HFNC between 8-<1 h/day. There were no differences in lung function; blood gasses; SGRQ or RCSQ over the observational period). Walking distance improved significantly (393-441 m p = 0.049) as did time to recovery (3.4-2-2 min, p = 0.001). When correcting for HFNC use (hours/day) significant improvement was also seen in mMRC-score ( p = 0.035) and minimum saturation during 6MWT ( p = 0.01)., Conclusion: Despite a very heterogenous group and no effect on quality of life and -sleep, the study indicates an improvement in dyspnea and physical ability of HFNC in ILD patients.

A gap exists between guidelines and real-world clinical practice for the management and treatment of chronic obstructive pulmonary disease (COPD). Although this has narrowed in the last decade, there is room for improvement in detection rates, treatment choices and disease monitoring. In practical terms, primary care practitioners need to become aware of the huge impact of COPD on patients, have non-judgemental views of smoking and of COPD as a chronic disease, use a holistic consultation approach and actively motivate patients to adhere to treatment.This article is based on discussions at a virtual meeting of leading Nordic experts in COPD (the authors) who were developing an educational programme for COPD primary care in the Nordic region. The article aims to describe the diagnosis and lifelong management cycle of COPD, with a strong focus on providing a hands-on, practical approach for medical professionals to optimise patient outcomes in COPD primary care., (© 2021. The Author(s).)

Patients admitted to hospital with coronavirus disease 2019 (COVID-19) may develop acute respiratory failure (ARF) with compromised gas exchange. These patients require oxygen and possibly ventilatory support, which can be delivered via different devices. Initially, oxygen therapy will often be administered through a conventional binasal oxygen catheter or air-entrainment mask. However, when higher rates of oxygen flow are needed, patients are often stepped up to high-flow nasal cannula oxygen therapy (HFNC), continuous positive airway pressure (CPAP), bilevel positive airway pressure (BiPAP), or invasive mechanical ventilation (IMV). BiPAP, CPAP, and HFNC may be beneficial alternatives to IMV for COVID-19-associated ARF. Current evidence suggests that when nasal catheter oxygen therapy is insufficient for adequate oxygenation of patients with COVID-19-associated ARF, CPAP should be provided for prolonged periods. Subsequent escalation to IMV may be implemented if necessary.

To limit the ongoing COVID-19 pandemic, social distancing was introduced globally in the first half of 2020. COPD-patients were identified as a group at special risk in connection with the SARS-CoV-2 infection. Hence, social distancing has been important in this group of patients. However, little is known of the motives and consequences of social distancing in these vulnerable patients. The aim of this study was to explore the perspectives and experiences on social distancing among COPD-patients during the COVID-19 pandemic. Patients in this qualitative study were selected strategically, equally allocated between gender and age to obtain maximum variation. Data were collected using individual semi-structured telephone interviews during June and July 2020. The interview guide focused on three themes; life before, under and after the COVID-19 lockdown. A total of 18 patients (8 females, 10 males) participated. Four themes were identified as important for social distancing among COPD-patients: 'Being at high-risk and obtaining control', 'Protecting one life while missing on another', 'Social relationships and distancing' and 'Looking into the future'. The results increased our knowledge of patients' experiences of living with COPD during COVID-19 in which anxiety and fear of getting infected made patients control their surroundings through strict precautions. This led to a feeling of loneliness due to social distance and an altered life-illness balance, as they protected one life while missing on another.