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In trying to differentiate between chronic bronchitis and emphysema, you know that chronic bronchitis:
1. Usually occurs after age 50 and has insidious progressive dyspnea.
2. Usually presents with a cough that is mild and with scant, clear sputum, if any.
3. Presents with adventitious sounds, wheezing and rhonchi, and a normal percussion note.
4. Results in an increased total lung capacity with a markedly increased residual volume.