Etiology and pathogenesis
Changes in the structure of the bronchial wall are irreversible. This can manifest as a symptom of other disorders or act as an independent pathology. Deformation develops under the influence of a combination of causes:
- Genetics and congenital anomalies: impaired ciliary motility (Kartagener syndrome), anatomical bronchial defects, or $\alpha_1$-antitrypsin deficiency, which thickens secretions.
- Airway obstruction: luminal occlusion by foreign bodies or external compression by enlarged bronchopulmonary lymph nodes.
- Chronic diseases and external factors: prolonged COPD (chronic bronchitis), inhalation of chemical toxins, and frequent aspiration pneumonia (characteristic of patients with alcoholism).
- Infectious agent: against the background of altered airway structure, bacteria, viruses, and fungi easily colonize the mucosa, triggering a chronic purulent-inflammatory process.
Classification by form
Morphologically, four types of dilations are distinguished: cylindrical, fusiform, varicose, and saccular. The shape of the defect directly determines the severity of the patient's condition. Saccular bronchiectasis has the most severe course because it creates ideal conditions for the accumulation and stasis of purulent exudate. Cylindrical and varicose forms drain better and are therefore tolerated more easily.
Clinical presentation
The disease is characterized by cyclicity: periods of remission alternate with periods of infection exacerbation.
During an exacerbation, fever increases and general well-being worsens. The main clinical marker is the postural drainage phenomenon, where the intensity of coughing and the volume of discharge depend on the patient's posture. A classic manifestation is the «morning bronchial toilet» symptom. When the patient wakes up and stands up, abundant purulent or mucopurulent sputum is expectorated «full mouth». An admixture of blood is often found in it.
There is also a specific form — «dry bronchiectasis». In this condition, there is no abundant sputum production at all, and the only symptom is hemoptysis.
Physical examination reveals:
- Noticeable weight loss in the patient.
- Changes in the hands: clubbing of the fingers (Hippocratic fingers) and watch-glass nails.
- Percussion: limitation of lower lung border mobility and areas of dullness.
- Auscultation: harsh breathing accompanied by ringing (consonating) fine moist rales. A crucial feature is that these rales are strictly localized to one area and do not change their position.
Complications
If the disease is prolonged and lacks radical treatment, severe consequences develop:
- Cor pulmonale.
- Chronic respiratory failure.
- Secondary amyloidosis (protein degeneration of tissues, predominantly affecting the kidneys).
- Malignant transformation (bronchial cancer).
Approaches to diagnosis and treatment
To confirm the diagnosis and precisely localize dilations, radiography, bronchoscopy, and bronchography are used. However, the most informative method (especially for surgeons) is computed tomography (CT). Diagnosis also aims to identify the cause of obstruction, the source of bleeding, and to rule out bronchial cancer, which can mimic this pathology.
Exacerbation therapy includes careful selection of antibiotics based on the sensitivity of the isolated microflora and mandatory bronchial clearance to improve pus drainage (physiotherapy, expectorants).
Surgical treatment is indicated to prevent fatal hemorrhages, malignancy, and amyloidosis. Operations can be radical (complete resection of affected tissue in localized forms) and palliative (removal of the most destroyed segments to alleviate the condition).
Briefly: answers to topical questions
What are the indications for surgical treatment of bronchiectasis?
Surgical treatment of bronchiectasis is indicated to prevent fatal complications when conservative therapy fails.
Main indications:
- Refractory course — presence of localized (1–2 segments, unilateral) bronchiectasis with frequent exacerbations and a persistent focus of infection when conservative treatment is completely ineffective.
- Urgent conditions — development of life-threatening complications, primarily pulmonary hemorrhages.
Refusal of timely surgery can lead to renal amyloidosis, malignancy (cancer), and profuse hemorrhages.
What constitutes the classic clinical triad of Kartagener syndrome?
The classic clinical triad of Kartagener syndrome includes three main manifestations.
- Bronchiectasis
- Situs inversus (situs inversus)
- Sinusitis (pansinusitis)
This syndrome is a variant of congenital bronchiectasis and is often associated with ciliary dyskinesia syndrome, leading to impaired mucociliary clearance.
What are the main bacterial pathogens cultured from sputum during bronchiectasis exacerbations?
In bronchiectasis, altered bronchi create conditions for microbial colonization, and exacerbation is associated with the activation of infection.
Among the bacterial agents explicitly named in the source:
- Staphylococcus aureus;
- Haemophilus influenzae.
Bacteriological sputum culture is required to verify the pathogen; antibacterial therapy is selected taking into account microflora sensitivity.
The «morning bronchial toilet» symptom is easy to visualize as a jug of water: while the patient lies down, the liquid (pus) remains in the widened «belly» of the bronchus. As soon as the person assumes an upright position, the contents flow toward the outlet, triggering a reflex cough and expectoration «full mouth».
Class and exam questions
What are the characteristic features of rales in bronchiectasis?
Ringing (consonating) fine moist rales are heard. Their main feature is strict localization and consistent auscultation in the exact same spot.
What is «dry bronchiectasis»?
This is a specific variant of the disease course characterized by the absence of classic abundant purulent sputum production, with hemoptysis being the patient's only complaint.
Why are the kidneys affected in this disease?
Prolonged purulent-inflammatory processes in the lungs lead to systemic protein metabolism disorders and the deposition of a specific protein, resulting in secondary amyloidosis, most commonly targeting the kidneys.
What else to study on this topic
- Pathophysiology of Kartagener syndrome and ciliary dysfunction.
- The role of alpha-1-antitrypsin deficiency in the development of bronchopulmonary pathologies.
- Secondary amyloidosis: mechanisms of renal tissue damage.
- Differential diagnosis of bronchiectasis and central lung cancer.
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