Vitamin D, ventilatory function and asthma control among bronchial asthma patients

Abstract

Background: Asthma is a chronic conducting airway disorder which characterized by reversible airway inflammation and obstruction. However, prevalence of some pulmonary disorders as bronchial asthma is increased with Vitamin D deficiency. Objective: The target of this study is to evaluate the association between status of vitamin D and ventilatory function & asthma control in patients with bronchial asthma in Jeddah area. Material and methods: One hundred Saudi patients with asthma of both sex; their age mean was 35.18±6.27 year were selected on referral to Internal Medicine Department, King Abdulaziz University Teaching Hospital, Saudi Arabia. Asthma was diagnosed by spirometry tests. Criteria for asthma diagnosis were in accordance with the Global Strategy for Asthma Management and Prevention (GINA 2016). Exclusion criteria included patients with renal, cardiac and liver diseases. All participants will be free to withdraw from the study at any time. Following pre-training testing, participants were enrolled in three groups according to 25-OHD levels: vitamin D deficiency group (A) 25-OHD level <20ng/ml, vitamin D deficiency group (B) 25-OHD level=20–30 ng/ml and normal vitamin D group(C) 25-OHD level >30ng/ml. Results: There was significant higher values of FVC, FEV1 and FEV1/FVC in group (C) compared to subgroup (A) and group (B) in addition to lower values of asthma control test in subgroup (C) compared to group (A) and group (B). While there was significant difference between groups. Moreover, the 25-OHD showed a strong direct relationship with FVC, FEV1, FEV1/FVC and asthma control test in the three groups (P<0.05). Conclusion: There is a close direct relationship between level of vitamin D, ventilatory function and asthma control in patients with bronchial asthma.