Which of the following individuals is most likely to have a restrictive lung disorder?
A 70-year-old retired librarian with interstitial lung disease
A 60-year-old farmer with a prolonged cough and sputum production
A 50-year-old office worker with a history of chronic obstructive pulmonary disease
A 30-year-old smoker with chronic bronchitis
The Correct Answer is A
A. Interstitial lung disease is the prototypical restrictive lung disorder characterized by inflammation and progressive fibrosis of the alveolar structures. This pathological scarring increases the elastic recoil of the lungs, resulting in significantly decreased lung compliance and reduced total lung capacity. The physiological hallmark is an inability of the lungs to fully expand during the inspiratory phase of the respiratory cycle.
B. A prolonged cough with sputum production in a farmer often suggests an obstructive pathology such as asthma or chronic bronchitis from organic dust exposure. Obstructive disorders are defined by increased airway resistance and air trapping rather than a reduction in the total volume the lungs can hold. These patients typically demonstrate a decreased FEV1 to FVC ratio, which is not characteristic of pure restrictive disease.
C. Chronic obstructive pulmonary disease is a clinical diagnosis encompassing emphysema and chronic bronchitis, both of which are strictly categorized as obstructive lung diseases. These conditions involve permanent enlargement of air spaces and airway narrowing that prevents efficient exhalation of air from the distal units. Consequently, the lungs become hyperinflated over time, which is the functional opposite of the volume restriction seen in fibrosis.
D. Chronic bronchitis is an obstructive pulmonary condition defined by chronic inflammation of the bronchial mucosa and hypertrophy of mucus-secreting glands. This leads to productive coughing and narrowing of the conducting airways, which increases resistance to expiratory airflow. Unlike restrictive disorders, it does not involve the parenchymal stiffening or the reduction in lung volumes associated with interstitial or extra-pulmonary restrictive pathologies.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Iron deficiency anemia is typically characterized by a microcytic, hypochromic profile, meaning the mean corpuscular volume would be significantly decreased. In this state, the red blood cells are smaller than normal due to the lack of iron available for hemoglobin synthesis. While common in pregnancy, it would not present with a normal MCV
B. Folate deficiency anemia is a type of megaloblastic anemia that results in an increased mean corpuscular volume, or macrocytosis. Folate is essential for DNA synthesis during erythropoiesis, and its absence causes red blood cell precursors to grow large without dividing properly. A patient with folate deficiency would typically show an MCV well above 100 fL.
C. Vitamin B-12 deficiency anemia, much like folate deficiency, causes macrocytic changes in the blood count. This results in large, immature red blood cells and an elevated MCV due to the impairment of nucleic acid metabolism. Since there is a "normal" MCV (normocytic), B-12 deficiency is an unlikely diagnosis for this specific clinical presentation.
D. Hemolytic anemia is a normocytic anemia, meaning the red blood cells that remain in circulation are of normal size, but their total number is reduced due to premature destruction. In pregnancy, this can occur due to autoimmune processes, infections, or mechanical factors. Because the bone marrow's production of cells is initially normal in size, the MCV remains within the standard physiological range.
Correct Answer is C
Explanation
A. IgE mediated mast cell degranulation: This mechanism defines Type 1 immediate hypersensitivity, typically observed in allergic rhinitis or anaphylaxis. It involves the cross-linking of IgE on mast cells, leading to the rapid release of histamine and leukotrienes. This process occurs within minutes of allergen exposure and does not involve the cellular T-cell response seen in Type 4 reactions.
B. Activation of complement proteins: Complement activation is a central feature of Type 2 and Type 3 hypersensitivity reactions. In Type 2, it leads to direct cell lysis or opsonization of target cells. In Type 3, it triggers inflammation around deposited immune complexes. Type 4 reactions are distinct because they are cell-mediated and do not rely on the complement cascade for tissue injury.
C. T-cell mediated delayed hypersensitivity: Type 4 reactions are unique because they are strictly cell-mediated and do not involve antibodies. Sensitized Th1 cells release cytokines that activate macrophages, or CD8+ cytotoxic T-cells directly kill target cells. This response is delayed, typically peaking 48 to 72 hours after antigen exposure, as seen in the tuberculin skin test or contact dermatitis.
D. Antigen-antibody complex deposition in the body tissues: This describes the pathophysiology of Type 3 hypersensitivity, such as systemic lupus erythematosus or serum sickness. In these cases, circulating immune complexes lodge in vessel walls or glomeruli, inducing a neutrophilic inflammatory response. Since Type 4 reactions are mediated by T-lymphocytes rather than antibodies, complex deposition is not a relevant mechanism for this category.
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