A 52-year-old man presents to your office for an acute visit because of coughing and shortness of breath. He is well known to you because of multiple office visits in the past few years for similar reasons. He has a chronic "smoker's cough," but reports that in the past 2 days his cough has increased, his sputum has changed from white to green in color, and he has had to increase the frequency with which he uses his albuterol inhaler. He denies having a fever, chest pain, peripheral edema, or other symptoms. His medical history is significant for hypertension, peripheral vascular disease, and two hospitalizations for pneumonia in the past 5 years. He has a 40 year history of smoking and continues to smoke two packs of cigarettes a day. 

• What is the probable diagnosis?
• What are other possible diagnoses?
• At this stage of the case study, what diagnostic studies and basic treatments including non pharmacological treatment are most appropriate to order and why?

Please be specific and precise with answers. A table format or bullet points would be beneficial in presenting your information with clarity or organization.

Reference for management of the case study:

From the 2019 Global Strategy for Prevention, Diagnosis, and Management of COPD. Retrieved from https://goldcopd.org/gold-reports/

Post your initial response and respond to one student by Sunday at midnight.  Both responses should be a minimum of 250 words, scholarly written, APA formatted, and referenced.  A minimum of 2 references