Which of the following is the classic clinical definition of chronic bronchitis?

A 28-year-old non-smoker is diagnosed with emphysema affecting the lower lobes bilaterally. Which type is most likely, and what enzyme is deficient?

A 22-year-old woman experiences shortness of breath, wheezing, and coughing after exposure to cats.

Spirometry shows decreased FEV₁ that improves after bronchodilator use.

What is the most likely diagnosis?

Chronic bronchitis can lead to which of the following complications?

A patient with bronchiectasis is most likely to experience which of the following complications?

Which type of emphysema predominantly affects the upper lobes of the lungs and is most strongly associated with smoking?

A 60-year-old male smoker presents with chronic cough and excessive sputum production.

He has mild cyanosis and peripheral edema.

What is the most likely diagnosis?

Which immunoglobulin plays a key role in the pathogenesis of allergic asthma?

A 35-year-old woman with a history of recurrent sinus infections and productive cough presents with foul-smelling sputum.

High-resolution CT of the chest shows dilated bronchi with thickened walls.

What is the most likely diagnosis?