Clinical Characteristics and Outcome Related to Blood Eosinophilic Chronic Obstructive Pulmonary Disease (COPD) Patients.

Introduction The term chronic obstructive pulmonary disease (COPD) refers to a range of illnesses that impair breathing and airflow. Clinical history of COPD is further impacted by frequent exacerbations known as acute exacerbation COPD in which these specific symptoms worsen contributing to emergency room (ER) visits and hospitalization. Blood eosinophils are a crucial indicator of therapy effectiveness and exacerbation rate. The role of blood eosinophils as a biomarker for treatment, response, exacerbation risk, inflammation, and other symptoms in COPD patients is implemented by the Global Initiative Obstructive Lung Disease (GOLD) as guidelines. Objective To determine the clinical characteristics and outcomes related specifically to eosinophilic COPD Patients. Methodology This is a retrospective single-center study of all AECOPD presented at ET between 2018 to 2019. A total of 120 patients were included. Patients were divided into two groups depending on blood eosinophil count: high (>300cells/µL) and low (<300cell/µL). Finally, Binary logistics regression was performed to determine correlations between clinical characteristics and eosinophil count levels. Results In the high eosinophil patients' group: none of the independent variables were statistically significant. However, in the low eosinophil patients' group: ER visits, lung disease, and symptomatic exacerbation made a statically significant contribution to the model (p-value of .008, .01, .001) respectively. Conclusion and recommendation The higher eosinophil levels showed better clinical outcomes compared to lower eosinophil levels. Increasing the level of symptomatic AECOPD episodes in low eosinophil levels may be linked to the onset of bacterial infection and airway inflammation. The study further recommends a prospective cross-sectional multi-center study which includes a follow-up of the patients to assess the number of exacerbations after initial treatment.