April, 2016 is National Sarcoidosis Awareness Month 2016. Sarcoidosis Information Learn more about sarcoidosis symptoms, diagnosis and treatment.
What is sarcoidosis?
Sarcoidosis is a disease that results from a specific type of inflammation of tissues of the body. It can appear in almost any body organ, but it starts most often in the lungs or lymph nodes.
The cause of sarcoidosis is unknown. The disease can appear suddenly and disappear. Or it can develop gradually and go on to produce symptoms that come and go, sometimes for a lifetime.
As sarcoidosis progresses, microscopic lumps of a specific form of inflammation, called granulomas, appear in the affected tissues. In the majority of cases, these granulomas clear up, either with or without treatment. In the few cases where the granulomas do not heal and disappear, the tissues tend to remain inflamed and become scarred (fibrotic).
Sarcoidosis was first identified over 100 years ago by two dermatologists working independently, Dr. Jonathan Hutchinson in England and Dr. Caesar Boeck in Norway. Sarcoidosis was originally called Hutchinson’s disease or Boeck’s disease. Dr. Boeck went on to fashion today’s name for the disease from the Greek words “sark” and “oid,” meaning flesh-like. The term describes the skin eruptions that are frequently caused by the illness.
What are symptoms of sarcoidosis?
Shortness of breath (dyspnea) and a cough that won’t go away can be among the first symptoms of sarcoidosis. But sarcoidosis can also show up suddenly with the appearance of skin rashes. Red bumps (erythema nodosum) on the face, arms, or shins and inflammation of the eyes are also common symptoms.
It is not unusual, however, for sarcoidosis symptoms to be more general. Weight loss, fatigue, night sweats, fever, or just an overall feeling of ill health can also be clues to the disease.
Who gets sarcoidosis?
Sarcoidosis was once considered a rare disease. We now know that it is a common chronic illness that appears all over the world. Indeed, it is the most common of the scarring lung disorders and occurs often enough in the United States for Congress to have declared a national Sarcoidosis Awareness Day in 1990.
Anyone can get sarcoidosis. It occurs in all races and in both sexes. Nevertheless, the risk is greater if you are a young black adult, especially a black woman, or of Scandinavian, German, Irish, or Puerto Rican origin. No one knows why.
Because sarcoidosis can escape diagnosis or be mistaken for several other diseases, we can only guess at how many people are affected. The best estimate today is that about five in 100,000 white people in the United States have sarcoidosis. Among black people, it occurs more frequently, in probably 40 out of 100,000 people. Overall, there appear to be 20 cases per 100,000 in cities on the East Coast and somewhat fewer in rural locations. Some scientists, however, believe that these figures greatly underestimated the percentage of the U.S. population with sarcoidosis.
Sarcoidosis mainly affects people between 20 to 40 years of age. White women are just as likely as white men to get sarcoidosis, but the black female gets sarcoidosis two times as often as the black male. No one knows what causes sarcoidosis.
Sarcoidosis also appears to be more common and more severe in certain geographic areas. It has long been recognized as a common disease in Scandinavian countries, where it is estimated to affect 64 out of 100,000 people. But it was not until the mid ’40s, when a large number of cases were identified during mass chest x-ray screening for the Armed Forces, that its high prevalence was recognized in North America.
What we know about sarcoidosis
Much about sarcoidosis remains unknown. Nevertheless, if you have the disease, you can be reassured about several things. Sarcoidosis is usually not crippling. It often goes away by itself, with most cases healing in 24 to 36 months. Even when sarcoidosis lasts longer, most patients can go about their lives as usual. Sarcoidosis is not a cancer. It is not contagious, and your friends and family will not catch it from you. Although it can occur in families, there is no evidence that sarcoidosis is passed from parents to children.
Some things we don’t know about sarcoidosis
Sarcoidosis is currently thought to be associated with an abnormal immune response. It is not known whether the trigger that initiates the immune disturbance is a foreign substance, chemical, drug, virus, or some other substance.
In general, sarcoidosis appears briefly and heals naturally in 60%-70% of the cases, often without the patient knowing or doing anything about it. From 20%-30% of sarcoidosis patients are left with some permanent lung damage. In 10%-15% of the patients, sarcoidosis can become chronic.
When either the granulomas or fibrosis seriously affect the function of a vital organ—the lungs, heart, nervous system, liver, or kidneys, for example—sarcoidosis can be fatal. This occurs 5%-10% of the time. Some people are more at risk than others; no one knows why.
No one can predict how sarcoidosis will progress in an individual patient. The patient’s symptoms, race, and the doctor’s findings can give some clues. For example, a sudden onset of general symptoms such as weight loss of feeling poorly are usually taken to mean that the course of sarcoidosis will be relatively short and mild. Dyspnea and possibly skin sarcoidosis often indicate that the sarcoidosis will be more chronic and severe.
White patients are more likely to develop the milder form of the disease. Black people tend to develop the more chronic and severe form.
Sarcoidosis rarely develops before the age of 10 or after the age of 60. However, the illness—with or without symptoms—has been reported in younger as well as in older people. When symptoms do appear in these age groups, the symptoms are those that are more general in nature, for example, tiredness, sluggishness, coughing, and a general feeling of ill health.
How is sarcoidosis diagnosed?
Preliminary diagnosis of sarcoidosis is based on the patient’s medical history, routine tests, a physical examination, and a chest x- ray.
The doctor confirms the diagnosis of sarcoidosis by eliminating other diseases with similar features. These include such granulomatous diseases as berylliosis (a disease resulting from exposure to beryllium metal), tuberculosis, farmer’s lung disease (hypersensitivity pneumonitis), fungal infections, rheumatoid arthritis, rheumatic fever, and cancer of the lymph nodes (lymphoma).
What are some signs and symptoms that suggest possible sarcoidosis?
In addition to the lungs and lymph nodes, the body organs more likely than others to be affected by sarcoidosis are the liver, skin, heart, nervous system, and kidneys, in that order of frequency. Patients can have symptoms related to the specific organ affected, they can have only general symptoms, or they can be without any symptoms whatsoever. Symptoms also can vary according to how long the illness has been under way, where the granulomas are forming, how much tissue has become affected, and whether the granulomatous process is still active.
Even when there are no symptoms, a doctor can sometimes detect signs of sarcoidosis during a routine examination, usually a chest x- ray, or when checking out another complaint. The patient’s age and race or ethnic group can raise an additional red flag that a sign or symptom of illness could be related to sarcoidosis. Enlargement of the salivary or tear glands and cysts in bone tissue are also among sarcoidosis signals.
The lungs are usually the first site involved in sarcoidosis. Indeed, about nine out of 10 sarcoidosis patients have some type of lung problem, with nearly one-third of these patients showing some respiratory symptoms—usually coughing, either dry or with phlegm, and dyspnea. Occasionally, patients have chest pain and a feeling of tightness in the chest.
It is thought that sarcoidosis of the lungs begins with inflammation of the alveoli (alveolitis), the tiny sac-like air spaces in the lungs where carbon dioxide and oxygen are exchanged. Alveolitis either clears up spontaneously or leads to granuloma formation. Eventually fibrosis can form, causing the lung to stiffen and making breathing even more difficult.
Eye disease occurs in about 20%-30% of patients with sarcoidosis, particularly in children who get the disease. Almost any part of the eye can be affected—the membranes of the eyelids, cornea, outer coat of the eyeball (sclera), retina, and lens. The eye involvement can start with no symptoms at all or with reddening or watery eyes. In a few cases, cataracts, glaucoma, and blindness can result.
The skin is affected in about 20% of sarcoidosis patients. Skin sarcoidosis is usually marked by small, raised patches on the face. Occasionally, the patches are purplish in color and larger. Patches can also appear on limbs, face, and buttocks.
Other symptoms include erythema nodosum, mostly on the legs and often accompanied by arthritis in the ankles, elbows, wrists, and hands. Erythema nodosum usually goes away, but other skin problems can persist.
Occasionally (1%-5%), sarcoidosis can lead to nervous system problems. For example, sarcoid granulomas can appear in the brain, spinal cord, and facial and optic nerves. Facial paralysis and other symptoms of nerve damage call for prompt treatment with medications such as high doses of cortisone (see below). Also, people with sarcoidosis can have depression that is unrelated to the activity of the disease and is felt to be, in part, because of a misdirected immune system.
Symptoms can appear suddenly and then disappear. Sometimes, however, they can continue over a lifetime.
How is sarcoidosis treated?
Fortunately, many patients with sarcoidosis require no treatment. Symptoms, after all, are usually not disabling and do tend to disappear spontaneously.
When therapy is recommended, the main goal is to keep the lungs and other affected body organs working and to relieve symptoms. The disease is considered inactive once the symptoms fade. After many years of experience with treating the disease, corticosteroid drugs remain the primary treatment for inflammation and granuloma formation. Prednisone is probably the corticosteroid most often prescribed today. There is no treatment at present to reverse the lung scarring (fibrosis) that might be present in advanced sarcoidosis. More than one test is needed to diagnose sarcoidosis.
Tests can also show if patients with sarcoidosis are getting better. Occasionally, a blood test will show a high blood level of calcium accompanying sarcoidosis. The reasons for this are not clear. When it does occur, the patient may be advised to avoid calcium-rich foods, vitamin D, or sunlight, or to take prednisone (this corticosteroid usually quickly reverses the condition).
Because sarcoidosis can disappear even without therapy, even doctors sometimes disagree on when to start the treatment, what dose to prescribe, and how long to continue the medicine. The doctor’s decision depends on the organ system involved and how far the inflammation has progressed. If the disease appears to be severe, especially in the lungs, eyes, heart, nervous system, spleen, or kidneys, the doctor may prescribe corticosteroid.
Corticosteroid treatment usually results in improvement. Symptoms often start up again, however, when it is stopped. Treatment, therefore, may be necessary for several years, sometimes for as long as the disease remains active or to prevent relapse.
Frequent checkups are important so that the doctor can monitor the illness and, if necessary, adjust the treatment.
Corticosteroids, for example, can have side effects: mood swings, swelling, and weight gain because the treatment tends to make the body hold on to water; high blood pressure; high blood sugar; and craving for food. Long-term use can affect the stomach, skin, and bones. This situation can bring on stomach pain, an ulcer, or acne or cause the loss of calcium from bones. However, if the corticosteroid is taken in carefully prescribed low doses, the benefits from the treatment are usually far greater than the problems.
Besides corticosteroid, various other drugs have been tried, but their effectiveness has not been established in controlled studies. These drugs include chloroquine (Aralen) and D-penicillamine. Several drugs such as chlorambucil (Leukeran), azathioprine (Imuran), methotrexate (Rheumatrex, Trexall), and cyclophosphamide (Cytoxan), which might suppress alveolitis by killing the cells that produce granulomas, have also been used. None have been evaluated in controlled clinical trials, and the risk of using these drugs must be compared closely with the benefits in preventing organ damage by the disease. They are not to be used by pregnant women.
Cyclosporine, a drug used widely in organ transplants to suppress immune reaction, has been evaluated in one controlled trial. It was found to be unsuccessful. More recently, thalidomide (Thalomid) has been used successfully in a limited number of patients and seemed to improve lung function and heal skin lesions. Infliximab (Remicade) has been reported recently as effective in treating patients with sarcoidosis.
There are many unanswered questions about sarcoidosis. Identifying the agent that causes the illness, along with the inflammatory mechanisms that set the stage for the alveolitis, granuloma formation, and fibrosis that characterized the disease is the major aim of researchers of sarcoidosis. Development of reliable methods of diagnosis, treatment, and eventually, the prevention of sarcoidosis is the ultimate goal.
Originally, scientists thought that sarcoidosis was caused by an acquired state of immunological inertness (anergy). This notion was revised when the technique of bronchoalveolar lavage provided access to a vast array of cells and cell-derived mediators operating in the lungs of sarcoidosis patients. Sarcoidosis is now believed to be associated with a complex mix of immunological disturbances involving simultaneous activation, as well as depression, of certain immunological functions.
Immunological studies on sarcoidosis patients show that many of the immune functions associated with thymus-derived white blood cells, called T-lymphocytes or T-cells, are depressed. The depression of this cellular component of systemic immune response is expressed in the inability of the patients to evoke a delayed hypersensitivity skin reaction (a positive skin test), when tested by the appropriate foreign substances, or antigen, underneath the skin.
In addition, the blood of sarcoidosis patients contains a reduced number of T-cells. These T-cells do not seem capable of responding normally when treated with substances known to stimulate the growth of laboratory-cultured T-cells. Neither do they produce their normal complement of immunological mediators, cytokines, through which the cells modify the behavior of other cells.
In contrast to the depression of the cellular immune response, humoral immune response of sarcoidosis patients is elevated. The humoral immune response is reflected by the production of circulating antibodies against a variety of exogenous antigens, including common viruses. This humoral component of systemic immune response is mediated by another class of lymphocytes known as B-lymphocytes, or B-cells, because they originate in the bone marrow.
In another indication of heightened humoral response, sarcoidosis patients seem prone to develop autoantibodies (antibodies against endogenous antigens) similar to rheumatoid factors.
With access to the cells and cell products in the lung tissue compartments through the bronchoalveolar technique, it also has become possible for researchers to complement the above investigations at the blood level with analysis of local inflammatory and immune events in the lungs. In contrast to what is seen at the systemic level, the cellular immune response in the lungs seems to be heightened rather than depressed.
The heightened cellular immune response in the diseased tissue is characterized by significant increases in activated T-lymphocytes with certain characteristic cell-surface antigens, as well as in activated alveolar macrophage. This pronounced, localized cellular response is also accompanied by the appearance in the lung of an array of mediators that are thought to contribute to the disease process; these include interleukin-1, interleukin-2, B-cell growth factor, B-cell differentiation factor, fibroblast growth factor, and fibronectin. Because a number of lung diseases follow respiratory tract infections, ascertaining whether a virus can be implicated in the events leading to sarcoidosis remains an important area of research.
Some recent observations seem to provide suggestive leads on this question. In these studies, the genes of cytomegalovirus (CMV), a common disease-causing virus, were introduced into lymphocytes, and the expression of the viral genes was studied. It was found that the viral genes were expressed both during acute infection of the cells and when the virus was not replicating in the cells. However, this expression seemed to take place only when the T-cells were activated by some injurious event. In addition, the product of a CMV gene was found capable of activating the gene in alveolar macrophage responsible for the production of interleukin-1. Since interleukin-1 levels are found to increase in alveolar macrophage from patients with sarcoidosis, this suggests that certain viral genes can enhance the production of inflammatory components associated with sarcoidosis. Whether these findings implicate viral infections in the disease process in sarcoidosis is unclear.
Currently, thalidomide is being studied as a treatment for sarcoidosis. Future research with viral models may provide clues to the molecular mechanisms that trigger alterations in white blood cell (lymphocyte and macrophage) regulation leading to sarcoidosis.
For difficult to treat (refractory) sarcoidosis and sarcoidosis involving the nervous system (neurosarcoidosis), recent research using biologic medications that inhibit tumor necrosis factor (TNF-blockers) has been beneficial. The TNF-blockers used were adalimumab (Humira) and infliximab.
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The cause of sarcoidosis is unknown. Because the lungs and thoracic lymph nodes (the lymph nodes located in the chest) are the most frequently involved organs, some physicians and researchers suspect that sarcoidosis may be caused by something that enters the body through the lungs, that is, something that is inhaled such as a virus or bacteria, or an unidentified environmental toxin.
In particular, there is some evidence that sarcoidosis may be associated with Mycobacterium tuberculosis, the bacterium that causes tuberculosis. Sometimes sarcoidosis and tuberculosis occur simultaneously, suggesting they may have the same cause. Also, scientists have found M. tuberculosis DNA in infected sarcoidosis tissue, suggesting the bacteria is present and may be causing the disease. On the other hand, it may be that a patient with sarcoidosis has a suppressed immune system, making them more susceptible to tuberculosis. Or, a patient with TB may be more susceptible to sarcoidosis. One may not have anything to do with the other except that if you have one, your body is defenseless against the other. Sarcoidosis also resembles berryliosis, a disease caused by inhalation of the metal berrylium.
There is some evidence of geographical clustering, meaning the disease tends to occur with greater frequency in certain geographical areas. This suggests an environmental cause (i.e., if everyone in the area is breathing the same environmental toxin, and if sarcoidosis is caused by that toxin, people living in the area where the toxicity is high are more likely to develop the disease) or transmissible agent (i.e., if one person in the area has sarcoidosis, and it is infectious, other people in the area are likely to get infected).
No matter whether the trigger is a chemical toxin or bacteria, sarcoidosis involves a malfunctioning immune system. It is not really clear what the problem is and how it begins. It may even have a partial genetic basis.
Familial sarcoidosis occasionally occurs, suggesting that there may be an inherited genetic component.
Incidence and Prevalence
The frequency of sarcoidosis (the percentage of a population infected at a given time) is largely unknown because many cases are asymptomatic and never reported. Often, sarcoidosis is discovered by a chest x-ray done for other purposes. Or, it is not seen until after death, during an autopsy.
According the the NIH’s National Heart, Lung, and Blood Institute, the occurrence of sarcoidosis was considered rare in the United States until fairly recently. It was detected in large numbers during a mass chest x-ray screening of U.S. military personnel in the 1940s. In 1990, Congress declared a Sarcoidosis Awareness Day to increase awareness of the disease. Although usually considered fairly mild, it can be a very serious, life-threatening condition, especially in certain racial and ethnic groups. For example, in the United States, young African-American men suffer the most severe form of sarcoidosis and have the highest mortality rate.
Unlike most lung diseases, sarcoidosis actually occurs more frequently in nonsmokers than smokers. It is not clear why.
Reference: http://holidaysofyear.com/national-sarcoidosis-awareness-month/ (April, 2016 is National Sarcoidosis Awareness Month 2016. Sarcoidosis Information Learn more about sarcoidosis symptoms, diagnosis and treatment.)