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Bronchial Hyperresponsiveness in Sarcoidosis

30. Oktober 2026 aktualisiert von: Agata Lewandowska, Bydgoszcz University of Science and Technology

The Impact of Bronchial Hyperresponsiveness and Asthma on Quality of Life in Patients With Sarcoidosis, Taking Into Account Radiological Phenotypes and Stages of Sarcoidosis

Pulmonary sarcoidosis may be accompanied by obstructive ventilatory defects and bronchial hyperresponsiveness (BHR), which can mimic the clinical presentation of asthma. In clinical practice, bronchial challenge tests are used as an adjunctive tool in the diagnosis of asthma in patients with suggestive symptoms but normal spirometry results. However, BHR is not specific to asthma and is also observed in patients with sarcoidosis. Further research is warranted by reports suggesting an association between BHR and the severity of respiratory symptoms in patients with pulmonary sarcoidosis. To assess the prevalence of BHR in the course of sarcoidosis and identify factors associated with its occurrence, methacholine bronchial challenge tests were performed in patients with sarcoidosis.

Despite the existing hypotheses explaining the presence of bronchial hyperresponsiveness in sarcoidosis, its pathogenesis remains largely unknown. The use of a methacholine bronchial challenge test and the assessment of its association with pulmonary radiological findings may help identify patients with sarcoidosis who are at increased risk of bronchial hyperresponsiveness, as well as improve our understanding of the mechanisms underlying its development.

Studienübersicht

Status

Abgeschlossen

Bedingungen

Intervention / Behandlung

Detaillierte Beschreibung

This was an observational, analytical, cross-sectional study with a retrospective component. The prospective component of the study assessed BHR using methacholine bronchial challenge testing in patients with established sarcoidosis.

Of the 81 patients with sarcoidosis assessed for eligibility, 70 were ultimately included in the study, having met all inclusion criteria and none of the exclusion criteria. The study protocol was developed in accordance with ATS/ERS recommendations. A 2-minute tidal breathing method with continuous inhalation of progressively increasing methacholine concentrations was used. Patients who exhibited less than a 20% decline in FEV1 at concentrations above 16 mg/ml were classified as having normal bronchial responsiveness. Based on the methacholine bronchial challenge test results, participants were classified into two groups according to the presence or absence of bronchial hyperresponsiveness. The groups were subsequently compared with respect to restrospectively obtained data (age, gender, smoking status, comorbidities, laboratory parameters, and skin prick test results to inhalant allergens). Assessed laboratory parameters included C-reactive protein serum levels, ionized and total serum calcium, and 24-hour urinary calcium excretion.

The groups were additionally compared with respect to the radiological findings (obtained retrospectively). Radiological phenotypes were classified according to the predominant pattern of pulmonary abnormalities observed on chest HRCT, using a seven-category (1-7) Delphi HRCT Phenotype Classification designed in 2024. Sarcoidosis stages were determined according to the Scadding classification (stages 0-IV), both at the time of initial diagnosis and at the time of methacholine challenge testing. HRCT findings were used to improve the accuracy of radiological assessment compared to conventional chest radiography. Changes in pulmonary parenchymal abnormalities over time were classified as radiological progression, regression, stability, or de novo presentation. This assessment was based on chest HRCT examinations performed at the time of methacholine challenge testing and compared with previous examinations obtained 6-12 months earlier during follow-up hospital admissions. Patients diagnosed with sarcoidosis less than one week before methacholine challenge testing were classified as de novo cases, whereas patients diagnosed at least six months earlier were classified as having pre-existing sarcoidosis. Radiological phenotypes, Scadding stages, and changes in radiological findings over time were jointly assessed by two pulmonologists and one radiologist. Consensus was reached on all classifications reported in the study.

In the group with a positive metacholine test result, the analysis included an assessment of bronchial hyperresponsiveness severity in relation to all the parameters.

Studientyp

Beobachtungs

Einschreibung (Tatsächlich)

70

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienorte

      • Bydgoszcz, Polen, 85-681
        • Clinical Department of Pulmonology, Allergology and Pulmonary Oncology, 10th Military Clinical Hospital with Polyclinic in Bydgoszcz, Poland

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

18 Jahre und älter (Erwachsene, Älterer Erwachsener)

Akzeptiert gesunde Freiwillige

Nein

Studienberechtigte Geschlechter

Alle

Probenahmeverfahren

Nicht-Wahrscheinlichkeitsprobe

Studienpopulation

Patients under the care of the Clinical Department of Pulmonology, Allergology, and Pulmonary Oncology at the 10th Military Clinical Hospital with Polyclinic in Bydgoszcz, Poland (between 11.2024 - 12.2025).

Beschreibung

Inclusion Criteria:

  • a confirmed diagnosis of sarcoidosis according to current ATS/ERS/WASOG guidelines,
  • availability of the required medical records,
  • ability to perform technically acceptable spirometry,
  • provision of written informed consent to participate in the study

Exclusion Criteria:

  • refusal to participate,
  • contraindications to methacholine bronchial challenge testing,
  • use of medications that could affect respiratory function without an adequate withholding period,
  • a prior diagnosis of asthma,
  • a respiratory tract infection within 8 weeks before the planned bronchial challenge test,
  • age under 18 years,
  • pregnancy and breastfeeding

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Beobachtungsmodelle: CASE_CROSSOVER
  • Zeitperspektiven: PROSPECTIVE

Kohorten und Interventionen

Gruppe / Kohorte
Intervention / Behandlung
Group with bronchial hyperresponsiveness

Participants who exhibited at least a 20% decline in FEV1 at matacholine concentrations <16 mg/ml.

The metacholine challenge test protocol was developed in accordance with ATS/ERS recommendations. A 2-minute tidal breathing method with continuous inhalation of progressively increasing methacholine concentrations was used. Patients who exhibited less than a 20% decline in FEV1 at concentrations above 16 mg/ml were classified as having normal bronchial responsiveness. A provocative concentration of methacholine causing a 20% reduction in FEV1 (PC20) of 4-16 mg/ml was considered indicative of borderline BHR. Positive bronchial challenge responses were further classified according to the PC20 value as mild (1-4 mg/ml), moderate (0.25-1 mg/ml), or marked (< 0,25 mg/ml).

Group without bronchial hyperresponsiveness

Participants who exhibited less than a 20% decline in FEV1 at matacholine concentrations above 16 mg/ml.

The metacholine challenge test protocol was developed in accordance with ATS/ERS recommendations. A 2-minute tidal breathing method with continuous inhalation of progressively increasing methacholine concentrations was used. Patients who exhibited less than a 20% decline in FEV1 at concentrations above 16 mg/ml were classified as having normal bronchial responsiveness. A provocative concentration of methacholine causing a 20% reduction in FEV1 (PC20) of 4-16 mg/ml was considered indicative of borderline BHR. Positive bronchial challenge responses were further classified according to the PC20 value as mild (1-4 mg/ml), moderate (0.25-1 mg/ml), or marked (< 0,25 mg/ml).

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Prevalence of bronchial hyperresponsiveness in patients with sarcoidosis
Zeitfenster: Periprocedural

The metacholine challenge tests were performed in all included participants (N=70). Eleven participants had been excluded earlier because they met the exclusion criteria, and therefore were not enrolled in the study.

Periprocedural

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Correlation Between the Presence and Severity of Bronchial Hyperresponsiveness, Selected Laboratory Parameters and Atopy in Sarcoidosis
Zeitfenster: Periprocedural

Data were obtained from the medical records of all included patients for laboratory parameters (N = 70) and from 63 patients for skin prick test results.

Periprocedural
Correlation Between the Presence and Severity of Bronchial Hyperresponsiveness and Pulmonary Radiological Findings in Sarcoidosis
Zeitfenster: Through study completion, an average of 1 year

Data was obtained from medical records of all included patients (N=70).

Through study completion, an average of 1 year

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Ermittler

  • Hauptermittler: Cezary Rybacki, PhD, Faculty of Medicine, Bydgoszcz University of Science and Technology, Bydgoszcz, Poland

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

1. November 2024

Primärer Abschluss (Tatsächlich)

31. Dezember 2025

Studienabschluss (Tatsächlich)

31. Dezember 2025

Studienanmeldedaten

Zuerst eingereicht

23. Oktober 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

30. Oktober 2026

Zuerst gepostet (Tatsächlich)

5. November 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

5. November 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

30. Oktober 2026

Zuletzt verifiziert

1. Oktober 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • 6/2024/KB

Plan für individuelle Teilnehmerdaten (IPD)

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NEIN

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

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