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Hypersensitivity pneumonitis (HP) is an immune-mediated interstitial lung disease (ILD) in sensitized individuals caused by a large variety of inhaled antigens. The clinical form of acute HP is often misdiagnosed, while the chronic form, especially the chronic fibrotic HP, is difficult to differentiate from other fibrotic ILDs. The present guideline for the diagnosis and treatment of HP replaces the former German recommendations for the diagnosis of HP from 2007 and is amended explicitly by the issue of the chronic fibrotic form, as well as by treatment recommendations for the first time. The evidence was discussed by a multidisciplinary committee of experts. Then, recommendations were formulated for twelve questions on important issues of diagnosis and treatment strategies. Recently published national and international guidelines for ILDs and HP were considered. Detailed background information on HP is useful for a deeper insight into HP and the handling of the guideline., Competing Interests: Eine Übersicht der Interessenkonflikte findet sich im Internet unter http://awmf.org; AWMF-Registriernummer 020-036., (Thieme. All rights reserved.)

The present recommendations on the therapy of sarcoidosis of the German Respiratory Society (DGP) was written in 2023 as a German-language supplement and update of the international guidelines of the European Respiratory Society (ERS) from 2021. It contains 5 PICO questions (Patients, Intervention, Comparison, Outcomes) agreed in the consensus process, which are explained in the background text of the four articles: Confirmation of diagnosis and monitoring of the disease under therapy, general therapy recommendations, therapy of cutaneous sarcoidosis, therapy of cardiac sarcoidosis., Competing Interests: Die Autorinnen/Autoren geben an, dass kein Interessenkonflikt besteht., (Georg Thieme Verlag KG Rüdigerstraße 14, 70469 Stuttgart, Germany.)

The evaluation of a patient with interstitial lung disease (ILD) includes assessment of clinical, radiological, and often histopathological data. As there were no specific recommendations to guide the evaluation of patients under the suspicion of an ILD within the German practice landscape, this position statement from an interdisciplinary panel of ILD experts provides guidance related to the diagnostic modalities which should be used in the evaluation of ILD. This includes clinical assessment rheumatological evaluation, radiological examinations, histopathologic sampling and the need for a final discussion in a multidisciplinary team., Competing Interests: Eine Übersicht der Interessenkonflikte findet sich im Internet unter http://awmf.org; AWMF-Registriernummer 020-028., (Thieme. All rights reserved.)

The SARS-CoV-2 pandemic had a tremendous impact on diagnosis and treatment of interstitial lung diseases (ILD). Especially in the early phase of the pandemic, when the delta variant was prevailling, a huge number of viral pneumonias were observed, which worsened pre-existing, triggered de novo occurence or discovery of previously subclincal interstitial lung diseases. The effect of SARS-CoV-2 infection - without or with accompanying viral pneumonia - on the further development of pre-existing ILD as well of new pulmonary inflitrates and consolidiations is difficult to predict and poses a daily challenge to interdisciplinary ILD boards. This position paper of the German Respiratory Society (DGP e.V.) provides answers to the most pressing questions based on current knowledge., Competing Interests: JB erhielt Honorare für Vortragstätigkeit und Beratung von AstraZeneca, Boehringer-Ingelheim, Ferrer, Galapagos, Novartis, Roche und Sanofi/Gemzyme. MPB hat Honorare für Vorträge, Beratung und Kongresssponsoring von Boehringer-Ingelheim und Roche erhalten. TGB erhielt Honorare für Vortragstätigkeit und Beratung von Astra-Zeneca, Boehringer-Ingelheim, Johnson & Johnson, MSD, Pfizer und Roche (ohne Zusammenhang mit dieser Arbeit). FB erhielt Honorare für Vortragstätigkeit und Beratung von Boehringer-Ingelheim, Roche, Sanofi, Fujirebio und Fibrogen. JD erhielt Honorare für Vortragstätigkeit und Beratung von Boehringer-Ingelheim, Parexel und Astrazeneca. SG erhielt Honorare für Vortragstätigkeit und Beratung von Boehringer-Ingelheim, Roche, Berlin Chemie, Novartis, Astra Zeneca. LH erhielt Honorare für Vortragstätigkeit und Beratung für Boehringer-Ingelheim und Roche. NK hat keine Interessenkonflikte. DK erhielt Honorare für Vortragstätigkeit und Beratung sowie finanzielle Unterstützung bei Kongressbesuchen von Boehringer Ingelheim und Roche. AP erhielt Vortragshonorare von Boehringer Ingelheim, Novartis, Roche, Pfizer und Chiesi und Beratungshonorare von Boehringer Ingelheim, Novartis, Amgen, und Astra-Zeneca. Forschungsprojekte am Fraunhofer ITEM bestehen mit Boehringer Ingelheim, Novartis, Chiesi, AdAlta, Alentis und AiThera. ESP erhielt Honorare für Vortragstätigkeit von Boehringer-Ingelheim, Roche und Bristol-Myers-Squibb. HS hat keine Interessenskonflikte. HW hat Beratungs-/Vortragshonorare von Astra Zeneca, Allergopharma, Boehringer Ingelheim, Bioprojet, GSK, Inspire Medical, Jazz Pharma, Novartis, ResMed, Sanofi, VitalAire sowie Vivisol erhalten. MK erhielt Honorare für Vortragstätigkeit und Beratung von Boehringer-Ingelheim, Roche, Ferrer, Galapagos., (Thieme. All rights reserved.)

Competing Interests: Disclosure The authors report no conflicts of interest in this work.

Sarcoidosis is a granulomatous systemic disease of unknown etiology most commonly affecting the lungs and thoracic lymph nodes. The diagnosis is based on typical clinical radiologic appearance and histology with evidence of noncaseating epithelioid cell granulomas without central necrosis. In the acute form, Löfgren's syndrome, histologic confirmation may not be necessary. Approximately half of patients may develop a chronic form, and extrathoracic organ involvement should be investigated during the course. Indications for therapy are based on functional limitations, marked organ-related or systemic symptoms, and life-threatening organ manifestations (cardiac, central nervous system, renal, and ocular sarcoidosis). To date, there is no approved drug therapy for sarcoidosis. Administration of immunosuppressants such as glucocorticosteroids and as add-on or sequential, methotrexate, azathioprine or mycophenolate mofetil is recommended in the currently published international guideline., Competing Interests: Erklärung zu finanziellen InteressenForschungsförderung erhalten: nein; Honorar/geldwerten Vorteil für Referententätigkeit erhalten: ja, von einer anderen Institution; Bezahlter Berater/interner Schulungsreferent/Gehaltsempfänger: nein; Patent/Geschäftsanteile/Aktien (Autor/Partner, Ehepartner, Kinder) an Firma (Nicht-Sponsor der Veranstaltung): nein; Patent/Geschäftsanteile/Aktien (Autor/Partner, Ehepartner, Kinder) an Firma (Sponsor der Veranstaltung): nein.Erklärung zu nicht-finanziellen InteressenDie Autorinnen/Autoren geben an, dass kein Interessenkonflikt besteht., (Thieme. All rights reserved.)

Background:  Quality of life (QoL) is significantly impaired in patients with pulmonary fibrosis, however reliable tools to assess QoL issues specific for this group of patients are still missing. We thus aimed to develop a new questionnaire called "Quality of life in patients with idiopathic pulmonary fibrosis" (QPF) to measure QoL in patients with fibrotic idiopathic interstitial pneumonias (IIP)., Methods:  An item pool was created on the basis of a German expert group with support of patients suffering from pulmonary fibrosis. In a 1st step, this version of the questionnaire was completed by 52 patients with idiopathic pulmonary fibrosis (IPF) or non-specific interstitial pneumonia (NSIP). Following this, an item- and an exploratory factor analysis was carried out and a 2nd version created. In a multicenter validation study in a one-group pre-post design, the questionnaire was filled in by 200 patients with IIP (IPF = 190, iNSIP = 10) at 2 time points with an interval of 6 months. Cross-validation was carried out with the St. Georges Respiratory Questionnaire (SGRQ)., Results:  The mean age of the patients was 71.0 years (50-90 years), 82.5 % were male. Item analysis revealed that most of Cronbach alpha and selectivity values of QPF-scales could be considered as sufficient (e. g. QPF-scale "condition" [alpha = 0.827], "impairment" [alpha = 0.882]). At scale level, there were significant differences in terms of a deterioration or improvement in the QPF-condition and QPF-breathlessness scales and also in the SGRQ-activity scale. Analysis of construct validation of QPF and SGRQ showed moderate correlations between both questionnaires. A deterioration in health status from the patient's and doctor's perspective was seen in the scales "impairment", "shortness of breath" and "health status" of the QPF. The QPF was able to detect a change in the patient's mood ("condition" scale) in the course of treatment., Conclusion:  This newly developed questionnaire maps the special needs of the patients well. The QPF is suitable for screening of quality of life as well as for supplementing the medical history and for monitoring the course of disease in fibrotic IIPs., Competing Interests: The authors declare that they have no conflict of interest., (The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).)

Health status and quality of life are impaired in patients with idiopathic pulmonary fibrosis (IPF) and idiopathic non-specific interstitial fibrosis (iNSIP). In Germany exists only the K-BILD questionnaire for patients with ILD 1 in a professional translation by Kreuter et al. 2 This questionnaire focuses on the main problems in patients with progressive lung fibrosis in a limited manner. Therefore a new quality of life questionnaire for patients with idiopathic pulmonary fibrosis was developed and linguistically validated., Methods:  The linguistic validation of our questionnaire was carried out in a multistage process in collaboration with the developer of the questionnaire and bilingual, professional translators. Review by the developers and back translations as well as clinical assessment by IPF- and iNSIP-patients ensured that the translated questionnaire reflected the intention of the original English version of our questionnaire.Cross-validation was carried out with the St. Georges Respiratory Questionnaire (SGRQ)., Results:  The new questionnaire concerning the health status was composed in English and German language. The questions cover five scales (sensitivity, selectivity and symptoms like breathlessness and cough and a visual analog scale on general health status) with 23 items., Conclusions:  The results show that the FFB maps the special needs of the patients with IPF and iNSIP well and can support clinical and scientific questions and can be helpful in monitoring the clinical course., Competing Interests: D. Kirsten, U. de Vries, U. Costabel, D. Koschel, F. Bonella, A. Günther, J. Behr, M. Claussen, St. Schwarz, A. Prasse, M. Kreuter geben keinerlei Interessenkonflikte an., (Thieme. All rights reserved.)

Competing Interests: Die Autorinnen/Autoren geben an, dass kein Interessenkonflikt besteht.

Idiopathic pulmonary fibrosis (IPF) is a severe and often fatal disease. Diagnosis of IPF requires considerable expertise and experience. Since publication of the international IPF guideline in the year 2011 and Update 2018 several studies and technical advances occurred, which made a new assessment of the diagnostic process mandatory. In view of the antifibrotic drugs which have been approved for the treatment of IPF patients, the goal of this guideline is to foster early, confident and effective diagnosis of IPF. The guideline focusses on the typical clinical setting of an IPF patient and provides tools to exclude known causes of interstitial lung disease including standardised questionnaires, serologic testing and cellular analysis of bronchoalveolar lavage. High resolution computed tomography remains crucial in the diagnostic work-up. If it is necessary to obtain specimen for histology transbronchial lung cryobiopsy is the primary approach, while surgical lung biopsy is reserved for patients who are fit for it and in whom bronchoscopic diagnosis did not provide the information needed. Despite considerable progress, IPF remains a diagnosis of exclusion and multidisciplinary discussion remains the golden standard of diagnosis., Competing Interests: Eine Übersicht der Interessenkonflikte findet sich im Internet unter http://awmf.org; AWMF-Registriernummer 020-016., (© Georg Thieme Verlag KG Stuttgart · New York.)

Background:  Interstitial lung diseases (ILD) encompass different heterogeneous, mainly chronic diseases of the pulmonary interstitium and/or alveoli with known and unknown reasons. The diagnostic of ILD is challenging and should be performed interdisciplinary. The medical history is of major importance and therefore, in German-speaking countries the Frankfurter Bogen (published in 1985) was utilised to scrutinise the medical history of the patient. This by now more than 30-years-old questionnaire requires a revision with regard to content and language., Method:  Under the auspices of the clinical section of the DGP the new Interstitial Lung Disease Patient Questionnaire was developed in collaboration amongst pulmonologist, occupational medicine physicians and psychologists and supported by patient support groups. The questionnaire was finally optimised linguistically with the help of patients., Results:  The newly developed patient questionnaire for interstitial and rare lung diseases encompasses different domains: initial and current symptoms, medical history questions including prior drug treatments, previous pulmonary and extrapulmonary diseases, potential exposition at home, work and leisure time as well as family history and travelling., Conclusion:  The newly developed questionnaire can facilitate the diagnosis in patients with suspicion on interstitial lung disease in clinical routine., Competing Interests: Die Autoren geben an, dass kein Interessenkonflikt besteht., (© Georg Thieme Verlag KG Stuttgart · New York.)

Idiopathic pulmonary fibrosis (IPF) is a severe and often fatal disease with a median survival of 2 - 4 years after diagnosis. Since the publication of the German IPF guideline in 2013 new treatment trials have been published, necessitating an update of the pharmacological therapy of IPF. Different from the previous guideline, the GRADE system was discarded and replaced by the Oxford evidence classification system which allows a more differentiated judgement. The following pharmacological therapies were rated not suitable for the treatment of IPF patients (recommendation A; evidence 1-b): triple therapy with prednisolone, azathioprine and acetyl-cysteine; imatinib; ambrisentan; bosentan; macitentan. A less clear but still negative recommendation (B, 1-b) was attributed to the treatment of IPF with the phosphodiesterase-5-inhibitor sildenafil and acetyl-cysteine monotherapy. In contrast to the international guideline antacid therapy as a general treatment for IPF was rated negative, based on conflicting results of recent analyses (recommendation C; evidence 4). An unanimous positive recommendation was granted for the antifibrotic drugs nintedanib and pirfenidone for the treatment of IPF (A, 1-a). For some open questions in the management of IPF patients for which firm evidence is lacking the guideline also offers recommendations based on expert consensus., Competing Interests: Jürgen Behr has received fees for lecturing and consulting activities from Actelion, Bayer, Boehringer-Ingelheim, Gilead, InterMune/Roche, Novartis. Research assistance was provided by Actelion and Boehringer-Ingelheim.Andreas Günther has received fees for lecturing and/or consulting activities from Roche, Boehringer Ingelheim Teva and Novartis as well as third-party funding within the scope of cooperation projects with Roche, Inventiva and Sanofi Aventis.Francesco Bonella has received fees for lecturing and consulting activities from InterMune/Roche and Boehringer Ingelheim as well as third-party funding for research projects from InterMune/Roche, Boehringer Ingelheim and Serendex/Savara.Klaus Geißler has stated no conflicts of interest.Dirk Koschel has received fees for lecturing and consulting activities from InterMune/Roche and Boehringer Ingelheim.Michael Kreuter has received fees for lecturing and consulting activities from InterMune/Roche and Boehringer Ingelheim as well as third-party funding for research projects from InterMune/Roche and Boehringer Ingelheim.Antje Prasse has received fees for lecturing and consulting activities from InterMune/Roche, Boehringer Ingelheim, Bayer and Actelion as well as third-party funding for research projects from Roche and Boehringer Ingelheim.Nicolas Schönfeld has stated no conflicts of interest.Helmut Sitter gibt has stated no conflicts of interest.Joachim Müller-Quernheim: Fees for lectures and/or consultancy from Roche and Norvatis. Income of the clinic within the scope of trials from Boehringer Ingelheim, Actelion, Roche and Bristol-Myers Squibb.Ulrich Costabel has received fees for lecturing and consulting activities from InterMune/Roche and Boehringer Ingelheim, for lecturing activities from AstraZeneca, for consulting activities from Bayer, GSK, UCB Celltech, Biogen, Fibrogen as well as third-party funding for research projects from InterMune/Roche and Boehringer Ingelheim., (© Georg Thieme Verlag KG Stuttgart · New York.)

Increased procoagulant activity in the alveolar compartment and uncontrolled inflammation are hallmarks of the acute respiratory distress syndrome (ARDS). Here, we investigated whether the contact phase system of coagulation is activated and may regulate inflammatory responses in human lungs. Components of the contact phase system were characterized in bronchoalveolar lavage fluids (BALF) from 54 ARDS patients and 43 controls, and their impact on cytokine/chemokine expression in human precision cut lung slices (PCLS) was assessed by a PCR array. Activation of the contact system, associated with high levels of coagulation factor XIIa (Hageman factor, FXIIa), plasma kallikrein and bradykinin, occurred rapidly in ARDS lungs after the onset of the disease and virtually normalized within one week from time of diagnosis. FXII levels in BALF were higher in ARDS non-survivors than survivors and were positively correlated with tumor necrosis factor (TNF)-α concentration. FXII induced the production and release of interleukin (IL)-8, IL-1β, IL-6, leukemia inhibitory factor (LIF), CXCL5 and TNF-α in human PCLS in a kallikrein-kinin-independent manner. In conclusion, accumulation of FXII in ARDS lungs may contribute to the release of pro-inflammatory mediators and is associated with clinical outcome. FXII inhibition may thus offer a novel and promising therapeutic approach to antagonize overwhelming inflammatory responses in ARDS lungs without interfering with vital haemostasis.

Competing Interests: The authors report no conflicts of interest in this work.

Sarcoidosis is a systemic disease of unknown aetiology. Typical histology shows epithelioid cell granulomas, and typical immunopathology enhanced Th1 type immune responses in the involved organs. The disease occurs worldwide, but more frequently in northern countries than in the south. In Germany, the incidence is estimated to be 10 per 100,000, and the prevalence 44-48 per 100,000. Sarcoidosis usually affects adults under 50 years of age, but can also be seen in children, adolescents and in the elderly. Women are more frequently affected than men. Familial clusters can occur. The clinical presentation of sarcoidosis varies widely and depends on the manifestations in the individual organ. Systemic symptoms include fatigue, night sweats, weight loss, fever, arthralgia and myalgia. Organ-specific symptoms include cough and dyspnoea, with pulmonary involvement, headache and palsy in neurosarcoidosis, arrhythmias and heart failure in cardiac sarcoidosis, and manifold skin lesions with skin involvement. Relapses are rarely seen in acute sarcoidosis, whereas the chronic form tends to relapse more frequently. Löfgren's syndrome, a specific phenotype of acute sarcoidosis, is characterised by bihilar lymphadenopathy, ankle arthritis and erythema nodosum. Chronic sarcoidosis can be asymptomatic, despite radiological changes, which may be extensive. By definition, sarcoidosis has become chronic after 2 years of disease with ongoing signs of activity. The long-term prognosis is generally good, but depends on the different organ manifestations and complications., Competing Interests: Interessenkonflikt: Nein., (Georg Thieme Verlag KG Stuttgart · New York.)

Background: Health status and quality of life are impaired in patients with interstitial lung disease (ILD). To assess these parameters in ILD patients no valid and reliable questionnaire exists in German language so far. The K-BILD questionnaire is a brief and valid tool to evaluate health status in ILD patients, with no validated German version. Method: The linguistic validation of K-BILD was carried out in a multistage process in collaboration with the developer of the questionnaire and bilingual, professional translators. Review by the developers and back translations as well as clinical assessment by ILD patients ensured that the translated questionnaire reflected the intention of the original K-BILD. Results: A German version of K-BILD with 15 questions concerning the health status was composed. The questions cover the three domains breathlessness and activities, psychological aspects and chest symptoms. Problems in understanding or difficulties in replying to the questions were not stated by the ILD patients. Conclusion: The German version of the K-BILD questionnaire allows the clinical and scientific use to measure reliable health quality in ILD patients., (© Georg Thieme Verlag KG Stuttgart · New York.)

Spirometry is a highly standardized method which allows to measure the forced vital capacity (FVC) with high precision and reproducibility. In patients with IPF FVC is directly linked to the disease process which is characterized by scaring of alveoli and shrinkage of the lungs. Consequently, there is ample evidence form clinical studies that the decline of FVC over time is consistently associated with mortality in IPF. As for the first time effective drugs for the treatment of IPF are available it becomes obvious that in studies which could demonstrate that the drug reduces FVC decline, a numerical effect on mortality was also observed, while in one study where a significant effect on FVC decline was missed, there was also no change in mortality. Based on these studies FVC decline is a validated surrogate of mortality in IPF. It is concluded that FVC decline is not only accepted as an endpoint of clinical treatment trials in IPF but is also valid as a patient related outcome parameter which should be considered for the assessment of the efficacy of an IPF drug., (© Georg Thieme Verlag KG Stuttgart · New York.)