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Sarcoidosis

Sarcoidosis is an immune system disorder characterised by non-necrotising granulomas (small inflammatory nodules). Virtually any organ can be affected, however, granulomas most often appear in the lungs (D860) or the lymph nodes (D861). more...

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Symptoms can occasionally appear suddenly but more often than not appear gradually. When viewing X-rays of the lungs, sarcoidosis can have the appearance of tuberculosis or lymphoma.

Epidemiology

Sarcoidosis occurs throughout the world in any race. It is more commonly seen in blacks than whites, primarily people of northern European descent in the latter case. Pulmonary involvement is the most common presentation of sarcoidosis.

Signs and symptoms

Sarcoidosis is a systemic disease that can affect any organ. Common symptoms are vague, such as fatigue unchanged by sleep, lack of energy, aches and pains, dry eyes, blurry vision, shortness of breath, a dry hacking cough or skin lesions. The cutaneous symptoms are protean, and range from rashes and noduli (small bumps) to erythema nodosum or lupus pernio.

The combination of erythema nodosum, bilateral hilar lymphadenopathy and arthralgia is called Lofgren syndrome. This syndrome has a relatively good prognosis.

Renal, liver, heart or brain involvement may cause further symptoms and altered functioning. Manifestations in the eye include uveitis and retinal inflammation, which may result in loss of visual acuity or blindness. Sarcoidosis affecting the brain or nerves is known as neurosarcoidosis.

The combination of anterior uveitis, parotitis and fever is called Heerfordt-Waldenstrom syndrome. (D868)

Hypercalcemia (high calcium levels) and its symptoms may be the result of excessive vitamin D production.

Sarcoidosis most often manifests as a restrictive disease of the lungs, causing a decrease in lung volume and decreased compliance (the ability to stretch). The vital capacity (full breath in, to full breath out) is decreased, and most of this air can be blown out in the first second. This means the FEV1/FVC ratio is increased from the normal of about 80%, to 90%.

Causes and pathophysiology

No direct cause of sarcoidosis has been identified, although there have been reports of cell wall deficient bacteria that may be possible pathogens. These bacteria are not identified in standard laboratory analysis. It has been thought that there may be a hereditary factor because some families have multiple members with sarcoidosis. To date, no reliable genetic markers have been identified, and an alternate hypotheses is that family members share similar exposures to environmental pathogens. There have also been reports of transmission of sarcoidosis via organ transplants.

Sarcoidosis frequently causes a dysregulation of vitamin D production; extrarenal (outside the kidney) production can be marked. Production of vitamin D goes on outside the kidneys. This results in elevated levels of the hormone 1,25-dihydroxyvitamin D and symptoms of hypervitaminosis D that may include fatigue, lack of strength or energy, irritability, metallic taste, temporary memory loss or cognitive problems. Physiological compensatory responses (e.g. suppression of the parathyroid hormone levels) may mean the patient does not develop frank hypercalcemia.

Read more at Wikipedia.org


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The mystery of sarcoidosis
From Ebony, 8/1/05 by Joy Bennett Kinnon

ITS victims are usually young and full of vigor. Their cases run the gamut from mildly irritating to life-threatening. The inflammatory disease is sarcoidosis, a systemic condition that can affect every organ in the body, although it most often begins in the lungs.

African-Americans, along with Swedes and Danes, have the highest rates of sarcoidosis in the world, according to the American Lung Association. Black women are victimized twice as often as Black men, and Blacks are also more likely to have more severe, chronic symptoms than Whites. And although deaths from the disease are rare, the mortality rate among Blacks is more than 16 times that of Whites.

In December 2004 sarcoidosis sufferer and NFL great Reggie White died at age 43. Medical experts believe sarcoidosis contributed to his death. Earlier this year comedian and actor Bernie Mac revealed that he's had the disease since 1983, and basketball legend Bill Russell and his daughter Karen Russell are both battling the mysterious disease.

Sarcoidosis (pronounced SARKOI-DOE-SIS) can appear in almost any organ in the body, although the inflammation of the body's tissues can begin in any organ and usually affects more than one organ.

The disease, which most commonly strikes young adults between the ages of 20 and 40, is a puzzling one, with no known cause and no cure.

"Most of the patients are young and this works to their disadvantage," says Dr. Talmadge E. King Jr., chief of medical services at San Francisco General Hospital and a fellow of the American College of Chest Physicians. "Patients often develop intense fatigue, and because they are so young, doctors tend not to believe them."

In fact, many patients complain that the disease is often routinely misdiagnosed. "The disease is often diagnosed serendipitously," Dr. King adds, "through a chest x-ray or routine physical exam."

For instance, it took more than a year to properly diagnose Dr. Marsha Thornhill's sarcoidosis--and she is a physician. A former marathon runner, she says she knew about fatigue--both from finishing a long race and from staying up all night as a resident on-call. "This kind of fatigue [associated with sarcoidosis] is indescribable and immobilizing," she says. "It's like trying to come up out of quicksand. You never feel refreshed, even after rest."

And because she was in such good physical shape, her physicians initially attributed her fatigue to a stressful workload. Although she was diagnosed in 2001 with multisystem sarcoidosis manifesting in very severe symptoms, her physicians now believe she may have had the disease anywhere from a year to 16 years prior to the 2001 diagnosis.

The 43-year-old New Jersey anesthesiologist says the frustration associated with getting a proper diagnosis motivated her to become more involved with helping sarcoidosis patients. "If this could happen to a physician in a major metropolitan area where we have access to the best care, [it could happen anywhere]," she says. She credits thoracic expert Dr. King with saving her life. "If it wasn't for him, I wouldn't be here right now," she says.

Open and honest communication between doctor and patient is a vital key to managing this disease, patients say. Andrea Wilson, founder of the Foundation for Sarcoidosis Research (FSR) in Chicago, has a virulent and potentially life-threatening form of the disease. She was first diagnosed in 1994, after eight years of battling perplexing symptoms. "They said I had multiple sclerosis, a brain tumor, inner-ear issues--just about everything under the sun," she says. "Finally I was lucky enough to get a doctor who was savvy enough to go the extra mile and order a chest x-ray that showed dramatic inflammation in both lungs."

After a brief respite from the disease, during pregnancy with her now 10-year-old daughter, "all hell broke loose" as the disease returned with a vengeance, and she was told bluntly by one physician to "go home and get your affairs in order." At that time she had a 2-month-old daughter at home, and she says she literally got up and walked out of his office. "I was mad as hell," she says now. Frustrated with the lack of knowledge about the disease, both in the medical and patient communities, she and her investment banker husband, Reading Wilson--who took a year's leave of absence from his job--formed the FSR in 2000. Their mission is twofold--to find the causes of and the cure for sarcoidosis, and to take care of the patients.

"Unfortunately, we get too many memorials--Reggie White and sportscaster Darrian Chapman, here in Chicago, died of sarcoidosis." FSR, she says, is the only privately funded organization funding groundbreaking research in sarcoidosis. To date, the organization has raised almost $1 million and funded six research projects, while partnering with the American Thoracic Society.

Wilson says former Boston Celtics star and Hall of Famer Bill Russell and his daughter have filmed a series of public service announcements for the group. Russell, who has sarcoidosis in his lungs, is championing this cause and working to raise awareness of the devastating disease.

Another advocate, Paula Yette Polite of Memphis, Tenn., says things have improved since her initial diagnosis in 1981 when she was in her early 20s. "It was five years from my diagnosis before I met anyone who had this disease," she says. "There were no patient organizations at that time." Polite has no internal organ involvement; her problems are limited mostly to her skin and joints. However, she says the numbing fatigue and side effects from prednisone, a corticosteroid drug treatment generally used to treat sarcoidosis, have dramatically affected her quality of life. Once active and outgoing, the divorcee now she has to conserve her strength, working part-time to care for her 9-year-old daughter Adira. In 1991, she formed a patient education association to focus on "patient education and public awareness."

Some signs and symptoms of sarcoidosis include fever, fatigue, weight loss, night sweats, small red bumps on the face, arms or buttocks (more common in Blacks than in Whites), red, watery eyes, arthritis in ankles, elbows, wrists and hands.

Physicians say the lungs are affected in more than 90 percent of sarcoidosis patients. A persistent cough and shortness of breath, particularly with exertion and chest pain, are prominent symptoms.

With this disease, Dr. King says, fatigue and chest pain are additional common symptoms that first send patients to a physician. Because these symptoms can mimic other diseases, doctors often use blood tests, chest x-rays, breathing tests and biopsy to diagnosis sarcoidosis.

Self-care is important when battling a chronic disease. Physicians and patients offer the following recommendations to facilitate living with sarcoidosis: Find a doctor you can communicate with. Polite and others recommend one central doctor--usually an internist--to coordinate the many specialists involved in sarcoidosis treatment; have your eyes examined every year, Dr. King says, because severe visual impairment or blindness can be side effects of the disease; keep a journal to record treatments, medications and how your body responds to the disease; exercise and therapeutic massage have been helpful to some patients; developing and/or maintaining a strong spiritual relationship helps buoy patients to fight the disease, experts say; maintain a strong support system. Along with family, friends and loved ones, a number of organizations and support groups exist to help people cope with sarcoidosis.

Despite the mysteries surrounding sarcoidosis, researchers are making significant progress in finding a cure, experts say. Wilson says her scientific advisory board is currently reviewing the results of some "very exciting and groundbreaking" research that will be revealed later this year. "We do have a way to go," she says, "however, it's a very exciting time."

COPYRIGHT 2005 Johnson Publishing Co.
COPYRIGHT 2005 Gale Group

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