A 50 year old male is evaluated in the emergency room (ER) for a complaint of dyspnea. The dyspnea has become worse over many years but today is especially bad. He reports a history of smoking. His breath sounds are clear but greatly diminished throughout his lungs. ABGs, peak flow test (PF), VQ scan and chest x-ray (CXR) are completed. Results are below. ABGs: pH 7.48, PCO2: 30, HCO3 : 24, PO2 80, SO2 94%. PF: 50%of predicted norm (ie, "low" PF). V/Q scan 0.8. CXR shows hyperinflated aveoli and air trapping.

Normal ABG ranges: PO2: 80-100 mmHg (Remember, you are supposed to know pCO2: 35-45 mmHg pH range, SO2 range, & RR range)HCO3: 22-26 mEq/L

Required:
a. What is the most likelydiagnosison this patient?
b. What is the expected breathing rate & pattern of this patient?