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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 bijgewerkt door: 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

Studie Overzicht

Gedetailleerde beschrijving

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.

Studietype

Observationeel

Inschrijving (Geschat)

134

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Volwassen
  • Oudere volwassene

Accepteert gezonde vrijwilligers

Nee

Bemonsteringsmethode

Niet-waarschijnlijkheidssteekproef

Studie Bevolking

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.

Beschrijving

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.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

Cohorten en interventies

Groep / Cohort
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.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Asthma Control Level Measured by Asthma Control Test (ACT) Score
Tijdsspanne: 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.

Secundaire uitkomstmaten

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

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

26 juli 2026

Primaire voltooiing (Geschat)

30 december 2026

Studie voltooiing (Geschat)

25 februari 2027

Studieregistratiedata

Eerst ingediend

22 juli 2026

Eerst ingediend dat voldeed aan de QC-criteria

26 juli 2026

Eerst geplaatst (Werkelijk)

29 juli 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

29 juli 2026

Laatste update ingediend die voldeed aan QC-criteria

26 juli 2026

Laatst geverifieerd

1 juli 2026

Meer informatie

Termen gerelateerd aan deze studie

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Beschrijving IPD-plan

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.

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

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