Inflammatory and oncological diseases
The appearance of blood in the sputum is an alarming sign, the etiology of which is usually divided into several major categories.
Infectious and inflammatory diseases of the respiratory tract lead in frequency. Hemoptysis accompanies acute pneumonia, abscesses, gangrene, and pulmonary tuberculosis (especially cavitary forms). Blood may appear in acute viral lesions (bronchitis, tracheitis, laryngitis against the background of ARVI) and bronchiectasis. Notably, in «dry» bronchiectasis, purulent sputum is absent, and bleeding occurs exclusively due to mucosal erosion in areas of inflammation or atrophy, where the walls of small vessels are damaged.
Oncological pathology requires special clinical vigilance. Bronchogenic lung cancer often manifests as moderate, but persistent hemoptysis. A specific, albeit rare, late sign of marked tumor breakdown is the discharge of sputum resembling «raspberry jelly».
Cardiovascular pathology
Pathology of the lesser circulation and the heart directly affects pressure in the pulmonary capillaries, leading to their rupture.
The vascular pathology group includes pulmonary embolism (PE), primary pulmonary hypertension, and pulmonary infarction. Pulmonary infarction is characterized by a clear sequence of symptoms: chest pain, fever, and cough (initially dry, and then with bloody sputum), while X-ray reveals a picture of focal pneumonia.
Cardiac causes include conditions causing marked venous congestion. These are acute left ventricular failure, chronic congestive heart failure, and mitral stenosis. The pathogenesis of hemoptysis in these valvular heart diseases is closely linked to the development of pronounced pulmonary hypertension.
Trauma, tissue destruction, and vasculitis
Traumatic and iatrogenic factors include mechanical chest injuries, lung contusion, foreign bodies in the airways, as well as injuries to the airways and pharynx. Bleeding can be triggered by anticoagulant therapy, bronchoscopy with biopsy, or pulmonary artery catheterization. Sometimes fragile vessels rupture simply due to a sharp increase in intrapulmonary pressure during a severe, debilitating cough.
The highest risk of massive pulmonary hemorrhage is carried by destructive processes and vasculitis. These include lung abscess and cavitary tuberculosis (where deep destruction of lung tissue occurs due to aseptic or infectious necrosis), Wegener's granulomatosis, and hemorrhagic alveolitis in systemic vasculitis.
In rare cases, the cause should be sought in genetics: hereditary hemorrhagic telangiectasia (Osler-Weber-Rendu disease) manifests as recurrent bleeding (pulmonary, nasal, gastrointestinal). Its diagnosis is based on the visualization of telangiectasias on the skin and mucous membranes, as well as family history. If, after a complete examination, the etiology remains unclear, it is referred to as idiopathic (cryptogenic) hemoptysis.
Hemoptysis in specific infections
Severe systemic infections play a significant role in the development of hemoptysis.
Tuberculosis According to the Russian classification, hemoptysis and pulmonary hemorrhage are classic complications of various forms of tuberculosis. The risk is high in destructive forms: caseous pneumonia, disseminated, cavitary, and fibro-cavitary tuberculosis. Hemoptysis often coexists with other formidable complications: spontaneous pneumothorax, atelectasis, cor pulmonale, and amyloidosis.
HIV infection Respiratory involvement in HIV is not pathognomonic for specific pathogens, but hemoptysis (occurring in about 20% of cases alongside fever and tachypnea) requires the exclusion of severe opportunistic conditions. Blood in the sputum may indicate focal or interstitial pneumonia caused by mixed bacterial-fungal flora (Candida, Aspergillus, Pneumocystis, CMV, Toxoplasma, atypical mycobacteria), or pulmonary tumors (Kaposi sarcoma).
Influenza and its complications Severe forms of influenza can also provoke blood discharge. This is due to the systemic effect of the virus: marked vasculitis, microcirculatory disorders, and aggravation of hemorrhagic syndrome develop. In early viral-bacterial (up to 4–5 days) or late post-influenza bacterial pneumonia, patients complain of a productive cough with purulent-bloody sputum. The main causative agent of bacterial complications is most often Staphylococcus aureus (Staphylococcus aureus).
To remember the 6 main groups of causes of hemoptysis, use the mnemonic: Inflammatory, Oncology, Vascular, Trauma (and iatrogenesis), Cardiac, Destructive (and vasculitis).
Class and exam questions
How to distinguish sputum in lobar pneumonia and late stages of lung cancer?
In lobar pneumonia, sputum acquires a specific «rusty» color due to the presence of altered blood. With marked breakdown of bronchogenic cancer, it may look like «raspberry jelly».
Why does hemoptysis occur in «dry» bronchiectasis?
The pathogenesis is associated with mucosal erosion in areas of inflammation or atrophy. This leads to damage to the walls of small vessels, even if purulent sputum is not discharged.
Does hemoptysis indicate pulmonary infarction in PE?
Yes, pulmonary infarction is characterized by a triad: chest pain, fever, and a cough that is initially dry and then accompanied by bloody sputum against the background of an X-ray picture of focal pneumonia.
What is the danger of hemoptysis in severe influenza?
It indicates the development of generalized vasculitis and aggravation of hemorrhagic syndrome. Such a condition is associated with a high risk of hemorrhagic pulmonary edema, cavitary bleeding, and fatal outcome.
What else to study on this topic
- Russian classification of pulmonary tuberculosis and its complications
- Spectrum of opportunistic respiratory tract lesions in HIV
- Pathogenesis of viral-bacterial pneumonia in influenza
- Destructive processes in the lungs: abscess and gangrene
- Osler-Weber-Rendu disease (hereditary hemorrhagic telangiectasia)
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