Chronic bronchitis
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Bronchitis is an inflammation of the bronchi (medium-size airways) in the lungs. Acute bronchitis is usually caused by viruses or bacteria and may last several days or weeks. Chronic bronchitis is not necessarily caused by infection and is generally part of a syndrome called chronic obstructive pulmonary disease (COPD); it is defined clinically as a persistent cough that produces sputum (phlegm) and mucus, for at least three months in two consecutive years.

Signs and symptoms

Bronchitis may be indicated by an expectorating cough (also known as a productive cough, i.e. one that produces sputum), shortness of breath (dyspnea) and wheezing. Occasionally chest pains, fever, and fatigue or malaise may also occur. Mucus is normally green or yellowish green and also may be a neon orange or green, depending on the pathogen causing the inflammation.

Causes

Tobacco smoking is the most common cause.^[1]. Pneumoconiosis and long-term fume inhalation are other causes.^[1]

Diagnosis

A physical examination will often reveal decreased intensity of breath sounds, wheeze (rales) and prolonged expiration. Most doctors rely on the presence of a persistent dry or wet cough as evidence of bronchitis.

A variety of tests may be performed in patients presenting with cough and shortness of breath:

• Pulmonary Function Tests (PFT) (or spirometry) must be performed in all patients presenting with chronic cough. An FEV1/FVC ratio below 0.7 that is not fully reversible after bronchodilator therapy indicates the presence of COPD, that requires more aggressive therapy and carries a more severe prognosis than simple chronic bronchitis.
• A chest X-ray that reveals hyperinflation; collapse and consolidation of lung areas would support a diagnosis of pneumonia. Some conditions that predispose to bronchitis may be indicated by chest radiography.
• A sputum sample showing neutrophil granulocytes (inflammatory white blood cells) and culture showing that has pathogenic microorganisms such as Streptococcus spp.
• A blood test would indicate inflammation (as indicated by a raised white blood cell count and elevated C-reactive protein).
• Neutrophils infiltrate the lung tissue, aided by damage to the airways caused by irritation.
• Damage caused by irritation of the airways leads to inflammation and leads to neutrophils being present
• Mucosal hypersecretion is promoted by a substance released by neutrophils
• Further obstruction to the airways is caused by more goblet cells in the small airways. This is typical of chronic bronchitis
• Although infection is not the reason or cause of chronic bronchitis it is seen to aid in sustaining the bronchitis.

Treatment

Antibiotics

For acute exacerbations of chronic bronchitis, if antibiotics are used, amoxycillin or doxycycline is recommended.

Bronchodilators

For acute exacerbations of chronic bronchitis, a clinical practice guideline by the American College of Physicians found that bronchodilators may help.^[2]

Corticosteroids

For acute exacerbations of chronic bronchitis, a clinical practice guideline by the American College of Physicians found that corticosteroids may help.^[2]

Smoking cessation

Main article: smoking cessation

References

1. ^ ^{a b} MedlinePlus - Bronchitis
2. ^ ^{a b} Bach PB, Brown C, Gelfand SE, McCrory DC (2001). "Management of acute exacerbations of chronic obstructive pulmonary disease: a summary and appraisal of published evidence". Ann. Intern. Med. 134 (7): 600–20. PMID 11281745. 

External links

Wikisource has the text of the 1911 Encyclopædia Britannica article Bronchitis.

• About.com - Chronic Bronchitis
• NIH Medline Plus - Bronchitis
• Familydoctor.org - Chronic Bronchitis
• eMedicineHealth - Bronchitis
• Bronchitis And Sinus Infection