Dr. Waqar Anwer (Emergency Medicine) needs a second opinion on this medical case.
A 45-year-old man presents to the emergency department with progressive shortness of breath and dyspnea on exertion, fever on and off and weight loss for the past month. The patient reports no chest pain, hemoptysis, orthopnea, paroxysmal nocturnal dyspnea, palpitations, or lower-extremity swelling.
On physical examination, the patient's temperature is 98.6°F . His pulse rate is 86 beats/min, with a regular rhythm. His blood pressure is 160/100mm Hg. The patient's respiratory rate is 22 breaths/min, with an oxygen saturation of 92% while breathing room air. His chest is nontender on palpation, and expands symmetrically. The abdominal, cardiac and neurologic examinations are unremarkable. The patient has no cyanosis, clubbing, or edema of the extremities.
What's the likely diagnosis and treatment?