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.