Pattern of vitamin D in patients with chronic obstructive pulmonary diseases and in patients with bronchial asthma

To determine the prevalence of vitamin D deficiency in patients with COPD and bronchial asthma, and the relation of vitamin D serum levels to pulmonary spirometric measures as well as other important clinical parameters that could affect quality of life in these patients. The study included 80 subjects: 30 patients with COPD and 30 patients with bronchial asthma and 20 healthy volunteers. Patients and control groups were subjected to vitamin D assay by ELISA as well as spirometric assessment. Assessment of patients with COPD was done according to GOLD guidelines 2013: using (mMRCs), CAT score, spirometric assessment of FEV1, and exacerbation assessment. They were also subjected to Combined COPD assessment and BODE index calculation. For all patients with bronchial asthma, GINA classification 2014 of bronchial asthma severity and asthma control assessment were done. Statistically significant lower values of vitamin D were found in patients with COPD (11.94±7.66ng/ml) compared to patients with bronchial asthma (22.03±8.19ng/ml) with p