Both forms alike the mucous membrane is always infiltrated with small cells. It is a serious matter when the purulent form attacks the smallest tubes — capillary bronchitis — as is so commonly the case in children, the practical result being very like that of pneumonia. These very small tubes cannot be followed up and laid open with scissors, and one must therefore get at the character of their contents by squeezing them out from the cut surface. Minute drops of pus welling up at a certain distance from one another on pressure, indicate the presence of capillary bronchitis. The connection between this form of inflammation and lobular atelectasis has been already alluded to. Chronic catarrhal bronchitis, such as is usually associated with emphysema, and, as has been already mentioned, is so often the cause of bronchiectasis, leads to considerable thickening of the mucous membranes; the transverse and longitudinal fibrous strise are brought out with great prominence, especially at the bifurcations, where they may give rise to actual stenosis. The portions of the wall which intervene between these projecting fibrous bands sometimes become bulged out and form minute diverticula. In those cases in which fibrinous or croupous bronchitis occurs independently of fibrinous or croupous pneumonia, it is generally secondary to laryngeal croup. The larger bronchi are found to be lined with a pretty dense, fibrinous false membrane, sometimes as much as two millimeters in thickness, which forms complete hollow casts of the tubes, and can be removed from them as such. Cases of uncomplicated fibrinous bronchitis are very rare, and usually run a chronic course. Tumors are very rarely primary in the bronchi. Small ecchondroses, or simple outgrowths from the cartilaginous rings, sometimes occur, and when metastatic deposits are very abundant in the lungs they are also sometimes found in the bronchial mucous membrane.
<Callout type="important" title="Critical Observation">When examining capillary bronchitis, look for minute drops of pus welling up on pressure from cut surfaces. This indicates severe inflammation and requires immediate medical attention.</Callout> The vessels are the only important parts of the lungs which still await our consideration. Some of the changes which they undergo have been already alluded to, as brown induration, the result of dilatation of the capillaries, the larger branches, and even the main trunk of the pulmonary arterj^ sometimes, in consequence of passive congestion dependent on valvular disease of the left heart; fatty degeneration of the intima is also to be sought for, a condition which predisposes to hemorrhagic infarction, and is manifested by the presence of irregularly-shaped yellow spots, or even small losses of substance, on the inner surface of the arteries. Then emboli which may escape demonstration, but give rise to embolic infarction and metastatic abscess; likewise aneurisms which are sometimes formed in cavities in the lung, and on bursting may give rise to fatal hemorrhage.
<Callout type="risk" title="Potential Complications">Embolism can occur without causing immediate symptoms but can lead to severe complications such as infarction or abscess formation.</Callout> The bronchial lymphatic glands present many pathological conditions, which may be either primary or secondary to changes in the lungs. They are almost always more or less pigmented, sometimes so much so that a black fluid resembling ink may be squeezed from the cut surface. This pigmentation generally corresponds in degree with that of the pulmonary tissue, though it is usually rather more intense.
<Callout type="beginner" title="Understanding Pigmentation">Pigmentation in lymphatic glands often reflects the severity and extent of lung pathology.</Callout>
Key Takeaways
- Capillary bronchitis is indicated by minute drops of pus on pressure from cut surfaces.
- Fatty degeneration predisposes to hemorrhagic infarction and abscess formation.
- Pigmentation in lymphatic glands reflects the severity of lung pathology.
Practical Tips
- When examining a patient with suspected capillary bronchitis, look for signs of pus on pressure from cut surfaces.
- Monitor patients with fatty degeneration closely as they are at risk for hemorrhagic infarction and abscess formation.
- Pigmentation in lymph nodes can indicate the severity of lung disease.
Warnings & Risks
- Capillary bronchitis is a serious condition that requires immediate medical intervention.
- Fatty degeneration of pulmonary arteries increases the risk of severe complications such as hemorrhagic infarction and abscess formation.
- Pigmentation in lymph nodes may indicate significant lung pathology.
Modern Application
While this chapter focuses on historical diagnostic techniques, understanding these conditions is still crucial today. Modern imaging technology can confirm many of these diagnoses non-invasively, but the principles remain the same. Knowledge of capillary bronchitis and its symptoms, for instance, helps in early detection and treatment.
Frequently Asked Questions
Q: What are the signs of capillary bronchitis?
Capillary bronchitis is indicated by minute drops of pus welling up at a certain distance from one another on pressure from cut surfaces.
Q: How does fatty degeneration affect pulmonary arteries?
Fatty degeneration predisposes to hemorrhagic infarction and abscess formation, manifesting as irregularly-shaped yellow spots or small losses of substance on the inner surface of the arteries.
Q: What does pigmentation in lymphatic glands signify?
Pigmentation in lymphatic glands generally corresponds in degree with that of the pulmonary tissue and reflects the severity and extent of lung pathology.