pneumonia

A 65-year-old woman with a past medical history of diabetes and chronic obstructive pulmonary disease presented with a 3-day history of shortness of breath and mostly dry cough. She was tachypneic, tachycardic, and afebrile on admission, and her oxygen saturation was 82% on room air. There were bilateral crackles and expiratory wheezes but no murmurs or gallop on auscultation and...