Vitamin D Status and Asthma Control, Pulmonary Function, and Oxidative Stress in Adults With Bronchial Asthma (VD-ASTHMA)
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
調査の概要
状態
状態
詳細な説明
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.
研究の種類
研究の種類
入学 (推定)
入学
参加基準
適格基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
サンプリング方法
調査対象母集団
説明
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.
研究計画
研究はどのように設計されていますか?
デザインの詳細
グループ/コホートの数
コホートと介入
グループ/コホートグループ/コホート |
|---|
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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.
|
この研究は何を測定していますか?
主要な結果の測定
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Asthma Control Level Measured by Asthma Control Test (ACT) Score
時間枠: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.
|
二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Pulmonary Function Parameters
時間枠:Single baseline assessment.
|
FEV1 % predicted FVC % predicted FEV1/FVC ratio
|
Single baseline assessment.
|
|
Oxidative Stress Biomarkers
時間枠:Single baseline assessment.
|
Malondialdehyde (MDA) Superoxide dismutase (SOD) Glutathione peroxidase (GPx) Reduced glutathione (GSH)
|
Single baseline assessment.
|
|
Serum Vitamin D Concentration
時間枠:Single baseline assessment.
|
Serum 25-hydroxyvitamin D concentration (ng/mL)
|
Single baseline assessment.
|
協力者と研究者
研究記録日
主要日程の研究
研究開始 (推定)
研究開始
一次修了 (推定)
一次修了
研究の完了 (推定)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
最終確認日
最終確認日
詳しくは
本研究に関する用語
追加の関連 MeSH 用語
その他の研究ID番号
その他の研究ID番号
- IRB00014233-38
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
IPD プランの説明
医薬品およびデバイス情報、研究文書
米国FDA規制医薬品の研究
米国FDA規制機器製品の研究
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