QCM : Diffuse Interstitial Lung Disease Fundamentals — 16 questions

Questions et réponses du QCM

1. What best defines diffuse infiltrative interstitial pneumopathies?

A group of pleural diseases producing only pleural effusions
A single inherited disorder causing isolated airway obstruction
A heterogeneous group marked by diffuse interstitial infiltration visible on imaging
A set of diseases limited to the alveolar spaces without interstitial involvement

A heterogeneous group marked by diffuse interstitial infiltration visible on imaging

Explication

These pneumopathies are defined by diffuse interstitial infiltration seen on imaging. The other options describe different disease patterns that do not match the interstitial definition.

2. Which structures belong to the pulmonary interstitium?

Only the alveolar air spaces and surfactant layer
Only the bronchiolar mucosa and mucus glands
Only the visceral pleura without septal structures
The supporting connective tissue of bronchovascular axes and septa, including the tissue under the pleura

The supporting connective tissue of bronchovascular axes and septa, including the tissue under the pleura

Explication

The pulmonary interstitium includes the connective tissue around bronchovascular axes, inter- and intralobular septa, and tissue under the pleura. It is not limited to air spaces or pleura alone.

3. What is the usual sequence in the pathogenesis of interstitial infiltrates when the initial trigger persists?

Initial aggression, mesenchymal accumulation, tissue repair, then fibrosis
Vascular thrombosis, necrosis, then spontaneous normalization
Alveolar rupture, pleural effusion, then airway remodeling
Fibrosis first, followed by mesenchymal repair and then inflammation

Initial aggression, mesenchymal accumulation, tissue repair, then fibrosis

Explication

The course describes a sequence of initial aggression followed by inflammatory reaction with mesenchymal accumulation, then repair, and fibrosis if the trigger continues. Persistent injury makes repair overshoot and leads to fibrosis.

4. Which statement best describes the cellular and non-cellular components of interstitial infiltrates?

They consist exclusively of lymphocytes and eosinophils with no structural change
They may include inflammatory, hyperplastic, or neoplastic cells, as well as edema, collagen changes, and mineral or organic material
They are caused only by bacterial invasion of the alveoli
They are limited to mucus plugging and smooth muscle spasm

They may include inflammatory, hyperplastic, or neoplastic cells, as well as edema, collagen changes, and mineral or organic material

Explication

Interstitial infiltrates can contain several cellular types and non-cellular elements such as edema, collagen changes, and even organic or mineral components. The other choices are too narrow and do not reflect the described mechanism.

5. How are acute diffuse interstitial lung diseases defined by duration?

They are defined only by seasonal recurrence
They have a rapid onset and last less than 3 weeks
They persist for more than 6 months
They are limited to childhood onset

They have a rapid onset and last less than 3 weeks

Explication

Acute PID are defined by rapid onset with a duration of less than 3 weeks. Longer durations belong to the subacute or chronic group.

6. Which set of etiologic categories is listed among the major causes of acute PID?

Smoking-related disease, lung cancer, and pleural effusion
Connective-tissue disease, drug toxicity, and sarcoidosis only
Infectious causes, hemodynamic causes, ARDS, and acute exacerbation of a subacute or chronic PID
Asthma, COPD, and pulmonary embolism

Infectious causes, hemodynamic causes, ARDS, and acute exacerbation of a subacute or chronic PID

Explication

The acute category includes infectious causes, hemodynamic causes, ARDS, and acute exacerbation of a subacute or chronic PID. The other choices mix chronic causes or unrelated diseases.

7. Which exam is considered a key diagnostic study in the workup of PID?

Plain skull radiography
High-resolution chest CT with 1 mm slice thickness
Electrocardiography at rest
Standard abdominal ultrasound

High-resolution chest CT with 1 mm slice thickness

Explication

High-resolution CT of the chest with 1 mm slices is highlighted as a key diagnostic exam because it analyzes elementary imaging signs. The other exams are not central to the PID imaging workup.

8. What is the recommended overall approach to the diagnostic workup of subacute or chronic PID?

Treatment based only on symptoms without investigations
Diagnosis based only on chest radiography
Immediate surgery before any noninvasive assessment
A multidisciplinary evaluation combining history, exam, imaging, pulmonary tests, BAL, and histology

A multidisciplinary evaluation combining history, exam, imaging, pulmonary tests, BAL, and histology

Explication

The workup relies on a multidisciplinary approach and integrates clinical history, exam, imaging, pulmonary function testing, BAL, and histology. A single test or symptom-based approach is insufficient.

9. Which disease is listed as a connective-tissue-related cause of chronic PID?

Acute bacterial pneumonia
Rheumatoid arthritis
Bronchial asthma
Pulmonary embolism

Rheumatoid arthritis

Explication

Rheumatoid arthritis is among the connective-tissue diseases associated with chronic PID. The other options are not listed as connective-tissue causes in this classification.

10. Which exposure is linked to hypersensitivity pneumonitis as a chronic PID etiology?

Long-term exposure to ambient noise
Repeated exposure to organic antigens such as bird breeding or farmer's lung
Single brief exposure to cold air
Exposure to sunlight in outdoor workers

Repeated exposure to organic antigens such as bird breeding or farmer's lung

Explication

Hypersensitivity pneumonitis is associated with repeated exposure to organic antigens, including occupational settings like bird breeders and farmer's lung. The other choices are not etiologic exposures for this disease.

11. Which clinical evolution is most consistent with sarcoidosis among diffuse interstitial lung diseases?

Guaranteed progression to pulmonary hypertension
Possible spontaneous resolution
Uniform progression to chronic respiratory failure
Immediate transformation into bronchial cancer

Possible spontaneous resolution

Explication

Sarcoidosis can resolve spontaneously depending on the underlying etiology. The more severe complications listed are associated with idiopathic pulmonary fibrosis, not sarcoidosis.

12. Which complication is specifically associated with worsening idiopathic pulmonary fibrosis?

Pleural effusion as the defining complication
Pulmonary hypertension
Left ventricular hypertrophy
Acute bacterial meningitis

Pulmonary hypertension

Explication

Idiopathic pulmonary fibrosis is described as progressing to chronic respiratory failure, pulmonary hypertension, infections, and bronchial cancer. Pulmonary hypertension is one of the key complications mentioned.

13. What is the basic treatment principle when a specific cause of diffuse interstitial lung disease has been identified?

Use surgery as the first-line option
Treat the identified cause directly
Start corticosteroids for every patient
Wait for spontaneous improvement before acting

Treat the identified cause directly

Explication

The main principle is to manage the identified cause, such as treating an infection or stopping a responsible exposure. Corticosteroids are not a universal first-line treatment for all cases.

14. Which intervention is recommended as symptomatic support in chronic respiratory insufficiency due to diffuse interstitial lung disease?

Bronchodilator monotherapy
Oxygen therapy
Routine anticoagulation
High-dose vitamin supplementation

Oxygen therapy

Explication

Oxygen therapy is specifically mentioned as symptomatic treatment when chronic respiratory impairment is present. The other options are not stated as core treatment principles here.

15. Which statement best describes idiopathic pulmonary fibrosis treatment?

Observation alone is sufficient in symptomatic patients
Antifibrotic drugs such as pirfenidone or nintedanib may be used
Corticosteroids and immunosuppressors are standard long-term therapy
Antibiotics are the main treatment in all cases

Antifibrotic drugs such as pirfenidone or nintedanib may be used

Explication

Idiopathic pulmonary fibrosis is treated with antifibrotic therapy, including pirfenidone and nintedanib, and transplantation may be considered. Corticosteroids and immunosuppressors are stated to have no place in this disease.

16. Which sarcoidosis situation is managed with surveillance rather than immediate drug therapy?

Lofgren syndrome
An asymptomatic patient without severe extrarespiratory involvement
Severe extrarespiratory involvement
Symptomatic disease with high risk of progression

An asymptomatic patient without severe extrarespiratory involvement

Explication

Asymptomatic sarcoidosis without severe extrarespiratory involvement may be followed with surveillance. Symptomatic disease and severe extrarespiratory involvement usually require active treatment.

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Diffuse infiltrative pneumopathies — definition?

Heterogeneous group with diffuse interstitial infiltration.

Pulmonary interstitium — function?

Supports airways, septa, and pleura tissues.

Interstitial infiltration pattern — types?

Cellular or fibrous, fibrosis is irreversible.

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