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Pulmonary Function:D.R. is a 27-year-old man, who presents to the nurse practitioner at the Family Care Clinic complaining of increasing SOB, wheezing, fatigue, cough, stuffy nose, watery eyes, and postnasal drainage—all of which began four days ago. Three days ago, he began monitoring his peak flow rates several times a day. His peak flow rates have ranged from 65-70% of his regular baseline with nighttime symptoms for 3 nights on the last week and often have been at the lower limit of that range in the morning. Three days ago, he also began to self-treat with frequent albuterol nebulizer therapy. He reports that usually his albuterol inhaler provides him with relief from his asthma symptoms, but this is no longer enough treatment for this asthmatic episode.Case Study QuestionsAccording to the case study information, how would you classify the severity of D.R. asthma attack?Name the most common triggers for asthma in any given patients and specify in your answer which ones you consider applied to D.R. on the case study.Based on your knowledge and your research, please explain the factors that might be the etiology of D.R. being an asthmatic patient.Your initial post should be at least 500 words per case study, formatted and cited in current APA style with support from at least 2 academic sources.