Cuestionario: Asthma Pathophysiology — 10 preguntas

1. Which feature most completely defines asthma?

A. A structural abnormality of the lungs present from birth

B. A bacterial infection of the respiratory mucosa causing permanent airway obstruction

C. An isolated episode of bronchoconstriction without persistent airway inflammation

D. A chronic inflammatory airway condition causing recurrent attacks of impaired breathing

Answer: (D)

Explicación

Asthma is a chronic inflammatory condition of the respiratory mucosa that narrows the airways and causes attacks of impaired breathing. An isolated bronchoconstriction episode does not by itself constitute the full definition of asthma.

2. What is the definition of asthma?

A. A genetic disorder leading to the destruction of alveoli in the lungs.

B. An acute infectious disease affecting the respiratory tract.

C. A temporary obstruction of the airways caused by mucus buildup during infections.

D. A chronic inflammatory condition of the respiratory mucosa characterized by narrowing of the respiratory passageways causing attacks of impaired breathing.

Answer: (D)

Explicación

Asthma is defined as a chronic inflammatory condition of the respiratory mucosa characterized by narrowing of the respiratory passageways that causes attacks of impaired breathing. The other options describe different respiratory conditions or are incorrect.

3. A patient experiences one brief episode of airway narrowing but has no evidence of chronic respiratory inflammation. Why should this episode not by itself be classified as asthma?

A. Asthma requires congenital lung abnormalities to be present

B. Asthma is defined by infection rather than by airway narrowing

C. Asthma affects the nasal passages but not the respiratory airways

D. Asthma requires a chronic inflammatory airway condition, not just isolated bronchoconstriction

Answer: (D)

Explicación

Asthma involves chronic inflammation of the respiratory mucosa together with airway narrowing and attacks of impaired breathing. A single episode of bronchoconstriction lacks the chronic inflammatory component of the definition.

4. What characterizes asthma as a respiratory condition?

A. An acute bacterial infection of the respiratory tract leading to persistent cough.

B. A temporary allergic reaction causing swelling of the nasal passages.

C. A genetic disorder resulting in excessive mucus production in the lungs.

D. A chronic inflammatory condition of the respiratory mucosa causing airway narrowing and breathing difficulties.

Answer: (D)

Explicación

Asthma is defined as a chronic inflammatory condition of the respiratory mucosa characterized by narrowing of the airways, leading to impaired breathing.

5. Which combination correctly identifies the atopic triad?

A. Atopic rhinitis, ASA sensitivity, and viral respiratory infections

B. Atopic dermatitis, nasal polyps, and cold-induced bronchoconstriction

C. Asthma, atopic dermatitis, and atopic rhinitis

D. Asthma, nasal polyps, and ASA sensitivity

Answer: (C)

Explicación

The atopic triad consists of asthma, atopic dermatitis (eczema), and atopic rhinitis. Nasal polyps and ASA sensitivity instead belong to Samter's triad.

6. What is the primary purpose of the ASA sensitivity pathway in the context of asthma?

A. To inhibit leukotriene synthesis and prevent bronchoconstriction

B. To produce large quantities of leukotrienes that cause bronchospasms

C. To activate the cyclooxygenase pathway to promote airway dilation

D. To increase prostaglandin production to reduce inflammation

Answer: (B)

Explicación

The ASA sensitivity pathway involves inhibition of the COX pathway, which leads to increased leukotriene production, causing bronchospasms. This pathway explains the mechanism behind ASA-sensitive asthma.

7. Which set of conditions and sensitivity characterizes Samter's triad?

A. Asthma, atopic dermatitis, and atopic rhinitis

B. Nasal polyps, eczema, and beta-blocker sensitivity

C. Asthma, pet dander exposure, and viral respiratory infection

D. Asthma, nasal polyps, and acetylsalicylic acid sensitivity

Answer: (D)

Explicación

Samter's triad consists of asthma, nasal polyps, and sensitivity to acetylsalicylic acid (ASA). Atopic dermatitis and atopic rhinitis are components of the atopic triad instead.

8. In the sequence of allergen recognition and Th2 response, which event occurs first?

A. Mast cells degranulate and release histamines.

B. IgE antibodies bind to mast cells.

C. Th2 cells release IL-4 and IL-5.

D. Dendritic cells recognize and internalize the allergen.

Answer: (D)

Explicación

The initial step in the allergen recognition process involves dendritic cells recognizing and internalizing the allergen, which then leads to subsequent activation of Th2 cells.

9. How does the mechanism of IgE-mediated mast cell activation differ from the activation of eosinophils in allergic asthma?

A. IgE directly causes eosinophil degranulation, whereas eosinophils activate mast cells through cytokine release.

B. Both mast cells and eosinophils are activated solely by allergen-specific IgE binding, with no other cytokine involvement.

C. Mast cell activation involves the release of leukotrienes and histamines, whereas eosinophil activation involves only the release of proteases.

D. IgE binds to FcεR1 receptors on mast cells causing degranulation, while eosinophil activation is primarily driven by IL-5 released by Th2 cells leading to leukotriene and protease release.

Answer: (D)

Explicación

IgE binds to FcεR1 receptors on mast cells, causing degranulation and release of histamines and leukotrienes. Eosinophil activation, however, is mainly driven by IL-5 released by Th2 cells, leading to leukotriene and protease release, which causes tissue damage and bronchoconstriction.

10. Who is credited with elucidating the role of leukotrienes in the pathway of ASA sensitivity and their impact on bronchospasms?

A. Theodor Kocher

B. Lars Peter Hansen

C. Rudolf Virchow

D. William Harvey

Answer: (A)

Explicación

The understanding of leukotrienes' role in ASA sensitivity and bronchospasms has been developed through research by various scientists, but the pathway involving leukotrienes and their impact on asthma symptoms has been extensively studied and characterized by researchers like Theodor Kocher, who contributed to the understanding of inflammatory mediators in respiratory conditions.