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The Role of Serum IL-1β in Combination with Fractional Exhaled Nitric Oxide in the Diagnosis of Adult Bronchial Asthma

Background: Asthma is a chronic airway disorder, in which cytokines are probably contributing in the inflammation and in the pathophysiology of the disease. This study aimed to determine the benefit of measurement of FENO and IL-1β in the diagnosis of asthma. Method: The study was conducted in Merjan Medical City and Spiro private clinic in Babylon province in the period from March to June 2019, 127 asthmatic patients were compared with 60 healthy subjects as control group. The age ranged from 10 to 60 years old, fractional exhaled nitric oxide (FENO) test was performed to assess asthma by using (Medisoft® company, Belgium). Body mass index (BMI) was subtracted as weight (kg)/height (m2). Waist circumference/cm (WC) was calculated between the inferior margin of thoracic ribs and midline of the iliac-crest. Hip circumference/cm (HC) was calculated from the broadest hip eminent before the waist/hip ratio (W/H) computed. The FENO measures had classified into low (<25 ppb) or intermediate-high (⩾25 ppb) according to the ‘’American Thoracic Society recommendations’’. Iterleukine-1 beta (IL-1β) was measured in the sera by ELISA technique using Human IL-1β (Interleukin 1-Beta) ELISA Kit from Elabscience®. Results: there was no significant correlation between the levels of FENO and IL-1β with body weight as measured by the way of BMI and waist/hip ratio. There was no correlation between duration of asthma with the levels of FENO and IL-1β. ROC curve analysis of FENO test in BA patients showed significant (p-0.001) high sensitivity (92%) and specificity (90%). However, ROC curve analysis of IL-1β in BA patients revealed non-significant (p-0.53), lower accuracy (56.4%), sensitivity 962%) and specificity (57%) to distinguish BA patients). Conclusion: No relation between obesity and eosinophilic airways inflammation. The measurement of FENO level is more important in assessment of asthma inflammation than IL-1β.