Which of the following are clinical findings associated with chronic bronchitis?

1. Cyanosis
2. Purulent sputum
3. Right heart failure
4. Elevated CO2 level
a. 1, 2
b. 3, 4
c. 1, 3
d. 1, 2, 3, 4

D
Patients with chronic bronchitis may demonstrate cyanosis, purulent sputum, right heart failure, and hypercarbia.