Chronic Bronchitis (cont.)
Charles Patrick Davis, MD, PhD
Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.
George Schiffman, MD, FCCP
Dr. Schiffman received his B.S. degree with High Honors in biology from Hobart College in 1976. He then moved to Chicago where he studied biochemistry at the University of Illinois, Chicago Circle. He attended Rush Medical College where he received his M.D. degree in 1982 and was elected to the Alpha Omega Alpha Medical Honor Society. He completed his Internal Medicine internship and residency at the University of California, Irvine.
Melissa Conrad Stöppler, MD
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
In this Article
- Bronchitis facts
- What is bronchitis?
- What is acute bronchitis?
- What are the symptoms of acute bronchitis?
- What is chronic bronchitis?
- What are the causes of chronic bronchitis?
- What are the risk factors for chronic bronchitis?
- What are the symptoms of chronic bronchitis?
- When should an individual seek medical care for chronic bronchitis?
- How is chronic bronchitis diagnosed?
- What is the treatment for chronic bronchitis?
- What are the complications of chronic bronchitis?
- Can chronic bronchitis be prevented?
- What is the outlook (prognosis) for chronic bronchitis?
- Bronchitis FAQs
- Find a local Pulmonologist in your town
What is chronic bronchitis?
Chronic bronchitis is defined as a cough that occurs every day with sputum production that lasts for at least 3 months, two years in a row. This definition was developed to help select uniform patient populations for research purposes, for example, to study medication therapies for treatment of chronic bronchitis.
Many of the bronchi develop chronic inflammation with swelling and excess mucus production. The inflammation causes a change in the lining cells of the airways to varying degrees. Many cells that line the airway lose the function of their cilia (hair-like appendages that are capable of beating rapidly), and eventually the ciliated cells are lost. Cilia perform the function of moving particles and fluid (usually mucus) over the lining surface in such structures as the trachea, bronchial tubes, and nasal cavities to keep these hollow structures clear of particles and fluids. These ciliated cells that help in clearance of secretions are often replaced by so-called goblet cells. This group of cells secretes mucus into the airway. The warm moist environment of the airway along with the nutrients in the mucus is an excellent medium for growing bacteria. The mucus often becomes infected and discolored from the bacterial overgrowth and the body's inflammatory response to it. The inflammation, swelling, and mucus frequently and significantly inhibit the airflow to and from the lung alveoli by narrowing and partially obstructing the bronchi and bronchioles.
The muscles that surround the some of the airways can be stimulated by this airway irritation. This muscular spasm also known as bronchospasm can result in further airway narrowing. With long standing inflammation, as can be seen in chronic bronchitis, this muscular spasm and inflammation results in a fixed, nonreversible narrowing of the airway and the condition is termed chronic obstructive pulmonary disease (COPD). Chronic coughing develops as the body attempts to open and clear the bronchial airways of particles and mucus or as an overreaction to ongoing inflammation. Chronic bronchitis can be a progressive disease; symptoms (listed below) increase over time. Some NIH investigators consider chronic bronchitis a type of COPD.
COPD also includes the entities ofemphysema, chronic bronchitis, and chronic asthma. These conditions are not always separable and patients often have components of each. In the case of chronic bronchitis, the fixed airway obstruction, airway inflammation and retained secretions can result in a mismatch of blood flow and airflow in the lungs. This can impair oxygenation of the blood as well as removal of the waste product, carbon dioxide.
Although people of any age can develop chronic bronchitis, the majority of people diagnosed with the disease are 45 years of age or older.
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