Epidemiology and disease structure
Chronic diffuse lung diseases rank first in prevalence among all chronic bronchopulmonary diseases. Statistics show a steady increase in the number of cases in the Russian Federation:
- In cities, the annual growth rate is 6–7%.
- In rural areas, this figure is 2–3%.
The total number of patients with this pathology doubles every 10–12 years. In the disease structure, the largest share (from 65 to 90%) is accounted for by chronic bronchitis. There is also an increase in cases of bronchial asthma, which is accompanied by epidemic outbreaks.
Etiology and pathogenesis
The development of the pathological process is closely linked to a complex of adverse factors:
- Environmental factors: pollutant emissions into the atmosphere.
- Smoking as a potent damaging agent.
- Occupational hazards: constant contact with organic and mineral dusts, toxic gases, and isocyanates.
- Infections: previous acute respiratory infections, especially of viral etiology.
- Immune status: individual state of the body's defense mechanisms.
- Genetic predisposition: the role of hereditary factors has been proven, in particular the PiZZ and PiSS phenotypes, which cause alpha-1 antitrypsin deficiency.
The morphogenesis of the pathology proceeds strictly along one of three possible pathways.
Classification of lung lesions
Taking into account functional features and the nature of morphological changes in the air-conducting or respiratory divisions, all diseases are divided into three main groups:
- Obstructive — with impaired patency of the airways.
- Restrictive — with a limitation of the lungs' ability to expand and a decrease in their volume.
- Mixed — combining signs of obstruction and restriction.
Note: A mixed type of lesion naturally develops in the late stages of almost all chronic diffuse lung diseases.
Briefly: answers to topical questions
Through what three pathways does the morphogenesis of chronic diffuse lung diseases occur?
The morphogenesis of chronic diffuse lung diseases is realized through three main mechanisms. These include:
- Bronchitogenic — based on impaired bronchial drainage function and bronchial patency.
- Pneumoniogenic — develops as a consequence of acute pneumonia and its complications.
- Pneumonitogenic — based on primary inflammation of the interstitium.
All three mechanisms ultimately lead to the development of pneumosclerosis, secondary pulmonary hypertension, and cor pulmonale.
Which nosologies belong to the group of chronic obstructive pulmonary diseases?
The group of chronic obstructive pulmonary diseases includes five main nosologies. These include:
- Chronic obstructive bronchitis;
- Bronchiectasis;
- Chronic obstructive pulmonary emphysema;
- Chronic bronchiolitis;
- Bronchial asthma.
The development of these diseases is based on impaired bronchial drainage function (obstructio — hindrance, obstruction), which is accompanied by decreased airway patency and increased resistive resistance to airflow.
What morphological changes in the bronchial wall are characteristic of chronic bronchitis?
Chronic bronchitis is characterized by the development of chronic inflammation in the bronchial wall. The main morphological substrate of the disease consists of:
- Chronic inflammation of the bronchial wall;
- Goblet cell hyperplasia;
- Mucous gland hyperplasia — accompanied by mucus production.
The pathological process affects the entire bronchial tree, including the bronchioles, leading to the development of chronic bronchiolitis.
Doubling every 10–12 years, and bronchitis accounts for 65–90%: remember the rule "10 years to double and almost 90% for bronchitis".
Class and exam questions
Which disease has the largest share in the structure of chronic diffuse lung diseases?
The largest share (from 65 to 90%) is accounted for by chronic bronchitis.
How often does the number of patients with chronic diffuse lung diseases double?
A doubling of the total number of patients is recorded every 10–12 years.
What groups are distinguished in the classification of lung diseases by functional characteristics?
Three groups are distinguished: obstructive, restrictive, and mixed (combining obstruction and restriction).
Which genetic factor predisposes to the development of the pathology?
Genetic predisposition is associated with PiZZ and PiSS phenotypes, which cause alpha-1 antitrypsin deficiency.
What else to study on this topic
- Dynamics of morbidity growth among the urban and rural population of the Russian Federation
- The impact of occupational factors and pollutants on lung tissue
- The role of alpha-1 antitrypsin deficiency (PiZZ, PiSS phenotypes) in pathogenesis
- Three possible pathways of morphogenesis of chronic diffuse lung diseases
- Clinical and morphological differences between obstructive and restrictive disorders in late stages
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