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Vitamin D Status and Asthma Control, Pulmonary Function, and Oxidative Stress in Adults With Bronchial Asthma (VD-ASTHMA)

26. juli 2026 opdateret af: Amany Gomaa Atiaa, Sinai University

Association Between Serum Vitamin D Status, Asthma Control, Pulmonary Function, and Oxidative Stress Biomarkers in Egyptian Adults With Bronchial Asthma: A Cross-Sectional Study

Asthma is a chronic inflammatory airway disease associated with variable airflow limitation and persistent respiratory symptoms. Vitamin D has been proposed as a potential biomarker related to immune regulation, asthma control, pulmonary function, and oxidative stress balance.

This prospective cross-sectional observational study aims to investigate the association between serum 25-hydroxyvitamin D [25(OH)D] concentrations, asthma control, pulmonary function parameters, and erythrocyte oxidative stress biomarkers among Egyptian adults with bronchial asthma.

A total of 200 adult asthma patients will be recruited from Abbassia Chest Hospital, Cairo, Egypt. Participants will undergo clinical assessment, Asthma Control Test (ACT), post-bronchodilator spirometry, serum vitamin D measurement, and oxidative stress biomarker assessment including malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GPx), and reduced glutathione (GSH).

Participants will be categorized according to serum 25(OH)D concentrations into vitamin D deficient, insufficient, and sufficient groups.

No intervention or treatment assignment will be performed.

5. Detailed Description

Studieoversigt

Status

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Betingelser

Detaljeret beskrivelse

This single-center cross-sectional observational study is designed to evaluate the association between serum vitamin D status and asthma-related clinical, functional, and biochemical characteristics among adult patients with bronchial asthma.

Eligible participants will be adults aged 18 years or older with confirmed bronchial asthma who are clinically stable at the time of assessment. Participants will be recruited from Abbassia Chest Hospital, Cairo, Egypt.

After obtaining written informed consent, demographic and clinical characteristics will be collected, including age, sex, body mass index (BMI), smoking status, asthma duration, previous exacerbations, hospitalization history, asthma severity, and current asthma medications including inhaled corticosteroids (ICS), long-acting β2 agonists (LABA), and short-acting β2 agonists (SABA).

Asthma control will be assessed using the Asthma Control Test (ACT), which evaluates symptom frequency, rescue medication use, activity limitation, and patient perception of asthma control.

Pulmonary function will be evaluated using post-bronchodilator spirometry according to ATS/ERS recommendations. The recorded parameters will include forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and FEV1/FVC ratio.

Blood samples will be collected for serum 25(OH)D measurement using the DiaSorin LIAISON® 25 OH Vitamin D chemiluminescent immunoassay and assessment of oxidative stress biomarkers in erythrocyte hemolysates, including MDA, SOD, GPx, and GSH.

Participants will be classified according to vitamin D status:

Vitamin D deficient: <20 ng/mL Vitamin D insufficient: 20-30 ng/mL Vitamin D sufficient: >30 ng/mL

The primary objective is to determine whether serum vitamin D concentration is associated with asthma control. Secondary objectives include evaluating associations with pulmonary function and oxidative stress biomarkers.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

134

Deltagelseskriterier

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Berettigelseskriterier

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Prøveudtagningsmetode

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Studiebefolkning

The study population will consist of 200 adult patients with confirmed bronchial asthma recruited from Abbassia Chest Hospital, Cairo, Egypt. Eligible participants will be adults aged ≥18 years with stable asthma at the time of assessment. Participants will be categorized according to serum 25-hydroxyvitamin D [25(OH)D] concentrations into vitamin D deficient (<20 ng/mL), vitamin D insufficient (20-30 ng/mL), and vitamin D sufficient (>30 ng/mL) groups. Clinical characteristics, asthma control, pulmonary function, serum vitamin D status, and erythrocyte oxidative stress biomarkers will be assessed during a single study visit.

Beskrivelse

Inclusion Criteria

  • Age ≥ 18 years.
  • Confirmed diagnosis of bronchial asthma.
  • Clinically stable at the time of assessment.
  • Availability of spirometry results.
  • Availability of laboratory investigations including serum 25(OH)D and oxidative stress biomarkers.

Exclusion Criteria

  • Other chronic pulmonary diseases.
  • Active respiratory infection.
  • Malignancy.
  • Significant renal or hepatic disease.
  • Pregnancy.
  • Current vitamin D supplementation.
  • Other conditions known to markedly influence oxidative stress status.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Vitamin D Deficient Group
Adults with bronchial asthma and serum 25-hydroxyvitamin D concentrations below 20 ng/mL.
Vitamin D Insufficient Group
Adults with bronchial asthma and serum 25-hydroxyvitamin D concentrations between 20 and 30 ng/mL.
Vitamin D Sufficient Group
Adults with bronchial asthma and serum 25-hydroxyvitamin D concentrations above 30 ng/mL.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Asthma Control Level Measured by Asthma Control Test (ACT) Score
Tidsramme: Single baseline assessment.
Assessment of asthma control using the Asthma Control Test (ACT) questionnaire, reported as an ACT score ranging from 0 to 25 points.
Single baseline assessment.

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Pulmonary Function Parameters
Tidsramme: Single baseline assessment.
FEV1 % predicted FVC % predicted FEV1/FVC ratio
Single baseline assessment.
Oxidative Stress Biomarkers
Tidsramme: Single baseline assessment.
Malondialdehyde (MDA) Superoxide dismutase (SOD) Glutathione peroxidase (GPx) Reduced glutathione (GSH)
Single baseline assessment.
Serum Vitamin D Concentration
Tidsramme: Single baseline assessment.
Serum 25-hydroxyvitamin D concentration (ng/mL)
Single baseline assessment.

Samarbejdspartnere og efterforskere

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Sponsor

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

26. juli 2026

Primær færdiggørelse (Anslået)

30. december 2026

Studieafslutning (Anslået)

25. februar 2027

Datoer for studieregistrering

Først indsendt

22. juli 2026

Først indsendt, der opfyldte QC-kriterier

26. juli 2026

Først opslået (Faktiske)

29. juli 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

29. juli 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

26. juli 2026

Sidst verificeret

1. juli 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • IRB00014233-38

Plan for individuelle deltagerdata (IPD)

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IPD-planbeskrivelse

Individual participant data will not be publicly shared. The datasets contain potentially identifiable health information, and participant consent and institutional ethical approval did not include unrestricted public data sharing. Reasonable requests for access to de-identified data may be considered by the corresponding author, subject to institutional and ethical approval.

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