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The term fibrosis describes the development of fibrous connective tissue as a reparative response to injury or damage. Fibrosis may refer to the connective tissue deposition that occurs as part of normal healing or to the excess tissue deposition that occurs as a pathological process. When fibrosis occurs in response to injury, the term “scarring” is used. Some of the main types of fibrosis that occur in the body are described below.
Pulmonary fibrosis refers to a number of conditions that cause interstitial lung damage, followed by fibrosis and eventually loss of lung elasticity. These conditions lead to symptoms such as persistent cough, chest pain, difficulty breathing and fatigue. Pulmonary fibrosis may occur as a secondary condition in various other diseases, but in many cases the underlying cause is not clear and the term idiopathic pulmonary fibrosis is used.
Pulmonary fibrosis can be divided into the following three types:
In many cases, the underlying condition that causes pulmonary fibrosis develops over many years, meaning people often develop the condition later on in life, with the incidence peaking between 50 and 70 years of age. The condition appears to affect males and females equally.
Some of the risk factors for pulmonary fibrosis include:
Many cases of pulmonary fibrosis can be managed with a combination of preventive measures and medications, although some patients may require a lung transplant.
Examples of preventive measures include stopping smoking, avoiding exposure to known irritants, attending any flu jabs and oxygen therapy. Some of the drugs that may be used include immunosuppressive agents such as corticosteroids or antifibrotic agents such as ciclosporin or colchicine. Where patients who do not respond to any of these measures, a physician may discuss the option of a lung transplant
Cirrhosis refers to the scar tissue and nodules that replace liver tissue and disrupt liver function. The condition is usually caused by alcoholism, fatty liver disease, hepatitis B or hepatitis C.
The liver is responsible for several essential functions such detoxifying certain substances in the body, producing essential nutrients and cleaning the blood. Every time the liver undergoes stress or injury, it tries to regenerate and produces scar tissue in the process. As the scar tissue builds up, liver function worsens and when cirrhosis is advanced, the liver no longer works properly. Cirrhosis does not give rise to symptoms until the damage has become extensive, at which point it may cause a wide range of symptoms. Examples include:
If liver cirrhosis is detected and diagnosed during the early stages of disease, any further damage to the liver may be prevented. Treatment depends on the stage of disease and the underlying cause of the cirrhosis, but the overall goal is to slow disease progression and relieve symptoms. This might include the following approaches:
When liver cirrhosis is advanced, a liver transplant using a donor organ may be the only option for some patients. A patient due to receive a transplant needs to undergo extensive testing to ensure they are healthy enough to undergo the procedure. Patients who have alcohol-related disease will also need to abstain form drinking alcohol for at least six months.
Areas of the heart that have become damaged due to myocardial infarction may undergo fibrosis. Cardiac fibrosis can affect the valves in the heart as well as the muscle, which becomes stiff and less compliant. This can increase the risk of heart failure.
Fibrocytes usually secrete collagen and are therefore essential for structural support of the heart. However, when these cells are over activated, fibrosis and thickening of the tricuspid valve and pulmonary valve can occur. This loss of flexibility in the valves can eventually cause valvular dysfunction and heart failure.
A compound present in red wine called resveratrol has been shown to slow the progression of cardiac fibrosis and other techniques such as microRNA inhibition are currently being studied in animal models of the disease.