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Pathophysiology

- The underlying pathophysiology of asthma is reversible and diffuse airway inflammation that leads to airway narrowing and obstruction.

- The inflammation is mediated by various cells and molecules such as mast cells, eosinophils, basophils, neutrophils, lymphocytes, macrophages, cytokines, chemokines, leukotrienes, prostaglandins, histamine, and nitric oxide.

- The inflammation results in two main processes:

  • Bronchoconstriction
  • airway remodeling

- Bronchoconstriction is the acute contraction of the smooth muscle in the bronchial walls that reduces the diameter of the airways and increases the resistance to airflow.

- Bronchoconstriction can be triggered by exposure to allergens, irritants, cold air, exercise, or emotional stress.

- Bronchoconstriction can be reversed by bronchodilators such as beta2-agonists that relax the smooth muscle.

- Airway remodeling is the chronic structural change in the airways that occurs due to prolonged inflammation and tissue damage.

- Airway remodeling can include subepithelial fibrosis, increased smooth muscle mass, mucus hypersecretion, goblet cell hyperplasia, epithelial cell shedding, angiogenesis, and edema. Airway remodeling can lead to irreversible airflow limitation and reduced responsiveness to bronchodilators.

Questions on Pathophysiology

Correct Answer is D

Explanation

Correct. Asthma is a common chronic respiratory condition characterized by airway inflammation and narrowing.

Correct Answer is B

Explanation

Incorrect. Checking for specific antibodies related to asthma is not a primary diagnostic test for asthma; it is more commonly associated with allergies.

Correct Answer is D

Explanation

Correct. Eosinophils are white blood cells that contribute to inflammation and airway damage in asthma by releasing inflammatory substances.

Correct Answer is D

Explanation

Correct. Outdoor allergens like pollen can trigger asthma symptoms in many individuals, so avoiding exposure is an important part of asthma management.

Correct Answer is C

Explanation

Incorrect. Asthma primarily involves airway inflammation and narrowing, not a lack of oxygen in the bloodstream.

Correct Answer is A

Explanation

Incorrect. ESR is a nonspecific test used to detect inflammation in the body but is not specific to asthma diagnosis.

Correct Answer is C

Explanation

Incorrect. ICS are not used to treat acute allergic reactions; they are aimed at preventing asthma symptoms over time.

Correct Answer is D

Explanation

Correct. A skin prick test, also known as a skin allergy test or scratch test, involves applying small amounts of allergens to the skin and monitoring for allergic reactions, helping identify specific allergens triggering asthma symptoms.

Correct Answer is B

Explanation

Incorrect. Bronchial smooth muscle does not release antibodies to protect against asthma attacks.

Correct Answer is D

Explanation

Correct Answer: D) "Asthma is a chronic respiratory condition that involves the narrowing of the airways."Rationale:

Correct Answer is B

Explanation

Incorrect. Pet fur and dander can be potent asthma triggers, and regular cleaning and reducing exposure to these allergens are essential for asthma management.

Correct Answer is C

Explanation

Incorrect. Evaluating bone density and fracture risk is not related to peak flow monitoring.

Correct Answer is B

Explanation

Incorrect. Mast cells do not produce antibodies to protect against asthma attacks.

Correct Answer is C

Explanation

Incorrect. Asthma is not a bacterial infection but a chronic respiratory condition.

Correct Answer is C

Explanation

Incorrect. There is no specific benefit to using a rescue inhaler before bedtime unless asthma symptoms are present at that time.

Correct Answer is C

Explanation

Incorrect. Peak flow measurements are a valuable tool in asthma management and are related to monitoring and controlling asthma symptoms.

Correct Answer is A

Explanation

Incorrect. Infrequent nighttime awakenings due to asthma may be a sign of well-controlled asthma but do not necessarily signal an exacerbation.

Correct Answer is B

Explanation

Incorrect. Bronchodilators are not used to treat allergic reactions; they are used to relieve acute bronchoconstriction associated with asthma.

Incorrect. While asthma action plans may mention triggers, their primary function is to guide actions during asthma attacks.

Incorrect. Allergies are one of several potential factors that can contribute to asthma, but they are not the sole cause.

Incorrect. Spacers are designed to make inhalers easier to use correctly, not more challenging.

Incorrect. Avoiding all exercise is not necessary for asthma prevention and can lead to other health problems. Properly managed exercise can be beneficial for individuals with asthma.

Correct. Spirometry is a common lung function test used to assess airflow and determine the presence and severity of asthma.

Correct. Respiratory infections, especially during early childhood, can be a risk factor for the development of asthma.

Incorrect. Asthma does affect the structure of the airways, primarily through inflammation and airway remodeling in the long term.

Incorrect. Asthma is a chronic condition, and while symptoms may improve with treatment, it does not typically resolve on its own within a few days.

Correct. A spacer device helps ensure that more of the medication reaches the lungs by slowing down and dispersing the spray from the inhaler, making it easier to inhale effectively.

Incorrect. Improved lung function and increased energy at night are not characteristic of asthma; in fact, asthma symptoms often worsen at night.

Incorrect. While emotional stress and anxiety can exacerbate asthma symptoms, they are not the sole triggers of the condition.

Correct. The correct technique involves standing with feet together and exhaling gently but forcefully into the peak flow meter.

Incorrect. Asthma is not an autoimmune disorder and does not primarily affect the joints.

Incorrect. Mild chest tightness after exposure to allergens is a common symptom of asthma but may not necessarily indicate a severe attack.

Incorrect. Having a diet low in processed foods may be associated with better overall health but is not a direct risk factor for asthma.

Correct. Frequent coughing and the production of thick mucus can be indicative of asthma, especially during exacerbations.

Incorrect. Difficulty speaking in full sentences is a more advanced symptom that may occur during an asthma attack.
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