A 68-year-old man presents for evaluation of progressive dyspnea. He has an extensive smoking history
A 68-year-old man presents for evaluation of progressive dyspnea. He has an extensive smoking history. Pulmonary function testing is consistent with severe airway obstruction. Resting arterial blood gas analysis demonstrates a partial pressure of oxygen of 54 m m H g . An echocardiogram shows normal left ventricular systolic function, right ventricular hypertrophy and dilation, […]