The Influence of Peripheral Blood Eosinophil Counts in Asthma Comorbidities in Adults: A Real Life Study

Asthma and eosinophilia are two closely related pathologies whose interaction is key in the era of precision medicine. However, this relationship is rarely taken into account without the influence of therapeutic prescriptions. In this study involving 1296 subjects, the relationship between eosinophilia and asthma was analyzed without taking into account other biases. We observed that rhinitis only appears in non-asthmatic patients with elevated blood eosinophil levels, while atopy was elevated in parallel to eosinophilia regardless of whether the patients were asthmatic or not. In terms of lung function, a decrease was observed for higher blood eosinophil levels, which is especially relevant in the FEV1/FVC ratio. FENO is elevated in relation to higher eosinophilia, but total IgE is only elevated in patients with high peripheral blood eosinophil levels and asthma. Finally, the only feature of asthma that is altered by increased peripheral eosinophilia is persistent asthma, with all other features remaining unchanged.