Reflex sympathetic dystrophy syndrome (RSDS) — also known as complex regional pain syndrome (CRPS)— is a chronic condition characterized by severe burning pain, pathological changes in bone and skin, excessive sweating, tissue swelling, and extreme sensitivity to touch. The syndrome, which is a variant of a condition known as causalgia, is a nerve disorder that occurs at the site of an injury (most often to the arms or legs). It occurs especially after injuries from high-velocity impacts such as those from bullets or shrapnel. However, it may occur without apparent injury. Causalgia was first documented in the 19th century by physicians concerned about pain Civil War veterans continued to experience after their wounds had healed. Doctors often called it "hot pain," after its primary symptom. Over the years, the syndrome was classified as one of the peripheral neuropathies, and later, as a chronic pain syndrome. RSDS is currently classified as a variant of causalgia, not necessarily caused by trauma. MedlinePlus (medlineplus. ... eMedicine is an online clinical medical knowledge base that was founded in 1996. ... The Diseases Database is a free website that provides information about the relationships between medical conditions, symptoms, and medications. ... Pain is an unpleasant sensation which may be associated with actual or potential tissue damage and which may have physical and emotional components. ... Grays illustration of a human femur, a typically recognized bone. ... Diagram of the layers of human skin In zootomy and dermatology, skin is an organ of the integumentary system composed of a layer of tissues that protect underlying muscles and organs. ... SWEAT is an OLN/TSN show hosted by Julie Zwillich that aired in 2003-2004. ... Reflex sympathetic dystrophy syndrome (RSDS) — also known as complex regional pain syndrome (CPRS)— is a chronic condition characterized by severe burning pain, pathological changes in bone and skin, excessive sweating, tissue swelling, and extreme sensitivity to touch. ... Nerves (yellow)    Nerves redirects here. ... Peripheral neuropathy is the medical term for damage to nerves of the peripheral nervous system, which may be caused either by diseases of the nerve or from the side-effects of systemic illness. ...

In ICD-10, it is listed as "Sympathetic reflex dystrophy", a form of algoneurodystrophy (M89.0), which has a distinct classification from causalgia (G56.4). The International Statistical Classification of Diseases and Related Health Problems (commonly known by the abbreviation ICD) is a detailed description of known diseases and injuries. ...

Symptoms

The symptoms of RSDS usually occur near the site of an injury, either major or minor, and include: burning pain, muscle spasms, local swelling, increased sweating, softening of bones, joint tenderness or stiffness, restricted or painful movement, and changes in the nails and skin. One visible sign of RSDS near the site of injury is warm, shiny red skin that later becomes cool and bluish.

The pain that patients report is out of proportion to the severity of the injury and gets worse, rather than better, over time. It is frequently characterized as a burning, aching, searing pain, which may initially be localized to the site of injury or the area covered by an injured nerve but spreads over time, often involving an entire limb. It can sometimes even involve the opposite extremity. Pain is continuous and may be heightened by emotional stress. Moving or touching the limb is often intolerable. Eventually the joints become stiff from disuse, and the skin, muscles, and bone atrophy. The symptoms of RSDS vary in severity and duration. There are three variants of RSDS, previously thought of as stages. It is now believed that patients with RSDS do not progress through these stages sequentially and/or that these stages are not time limited. Instead, patients are likely to have one of the three following types of disease progression: A top-down view of skeletal muscle Muscle is a contractile form of tissue. ...

1. Type one is characterized by severe, burning pain at the site of the injury. Muscle spasm, joint stiffness, restricted mobility, rapid hair and nail growth, and vasospasm (a constriction of the blood vessels) that affects color and temperature of the skin can also occur.
2. Type two is characterized by more intense pain. Swelling spreads, hair growth diminishes, nails become cracked, brittle, grooved, and spotty, osteoporosis becomes severe and diffuse, joints thicken, and muscles atrophy.
3. Type three is characterized by irreversible changes in the skin and bones, while the pain becomes unyielding and may involve the entire limb. There is marked muscle atrophy, severely limited mobility of the affected area, and flexor tendon contractions (contractions of the muscles and tendons that flex the joints). Occasionally the limb is displaced from its normal position, and marked bone softening is more dispersed.

Hair with a round cross-section will fall straight, as opposed to curly hair, which has a flat cross-section Hair is a filamentous outgrowth of the skin found only in mammals. ... Nails: left hand, 24 y. ... Vasospasm refers to a condition in which blood vessels spasm, leading to constriction. ... The arterial system The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... Osteoporosis is a disease of bone in which bone mineral density (BMD) is reduced and bone microarchitecture is disrupted. ... A tendon or sinew is a tough band of fibrous connective tissue that connects muscle to bone. ...

Cause

The cause of RSDS is unknown. The syndrome is thought to be the result of damaged nerves of the sympathetic nervous system — the part of the nervous system responsible for controlling the diameter of blood vessels. These damaged nerves send inappropriate signals to the brain, interfering with normal information about sensations, temperature, and blood flow. Since RSDS is most often caused by trauma to the extremities, other conditions that can bring about RSDS include sprains, fractures, surgery, damage to blood vessels or nerves, and cerebral lesions. The disorder is unique in that it simultaneously affects the nerves, skin, muscles, blood vessels, and bones. The nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and processes input from the senses, and initiates actions. ... Comparative brain sizes In animals, the brain, or encephalon (Greek for in the head), acts as the control center of the central nervous system. ...

Susceptibility

RSDS can strike at any age, but is more common between the ages of 40 and 60. It affects both men and women, but is most frequently seen in women. Although it can occur at any age, the number of RSDS cases among adolescents and young adults is increasing.

Investigators estimate that two to five percent of those with peripheral nerve injury and 12 to 21 percent of those with hemiplegia (paralysis of one side of the body) will suffer from RSDS.

How is RSDS diagnosed?

RSDS is often misdiagnosed because it remains poorly understood. Diagnosis is complicated by the fact that some patients improve without treatment. A delay in diagnosis and/or treatment for this syndrome can result in severe physical and psychological problems. Early recognition and prompt treatment provide the greatest opportunity for recovery.RSDS is diagnosed primarily through observation of the symptoms. However, some physicians use thermography — a diagnostic technique for measuring blood flow by determining the variations in heat emitted from the body — to detect changes in body temperature that are common in RSDS. A color-coded "thermogram" of a person in pain often shows an altered blood supply to the painful area, appearing as a different shade (abnormally pale or violet) than the surrounding areas of the corresponding part on the other side of the body. An abnormal thermogram in a patient who complains of pain may lead to a diagnosis of RSDS. X-rays may also show changes in the bone. Thermography can refer to a printing process and a imaging process. ... In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz...

What is the prognosis?

Good progress can be made in treating RSDS if treatment is begun early, ideally within 3 months of the first symptoms. Early treatment often results in remission. If treatment is delayed, however, the disorder can quickly spread to the entire limb and changes in bone and muscle may become irreversible. In 50 percent of RSDS cases, pain persists longer than 6 months and sometimes for years.

Treatment

Physicians use a variety of drugs to treat RSDS, including corticosteroids, vasodilators, and alpha- or beta-adrenergic-blocking compounds. Elevation of the extremity and physical therapy are also used to treat RSDS. Injection of a local anesthetic, such as lidocaine, is usually the first step in treatment. Injections are repeated as needed. TENS (transcutaneous electrical stimulation), a procedure in which brief pulses of electricity are applied to nerve endings under the skin, has helped some patients in relieving chronic pain. Neurostimulation (spinal cord stimulators) may also be surgically implanted to diffuse the pain by replacing it with a tingling sensation. These devices place electrodes either in the epidural space (space above the spinal cord) or directly over nerves located outside the central nervous system. Implantable drug pumps may also be used to deliver pain medication directly to the cerebrospinal fluid which allows the use of powerful opioids to be used in a much smaller dose than when taken orally. In some cases, surgical or chemical sympathectomy — interruption of the affected portion of the sympathetic nervous system — is necessary to relieve pain. Surgical sympathectomy involves cutting the nerve or nerves, destroying the pain almost instantly. But surgery may also destroy other sensations as well. A medication is a licenced drug taken to cure or reduce symptoms of an illness or medical condition. ... Anesthesia (AE), also anaesthesia (BE), is the process of blocking the perception of pain and other sensations. ... An opioid is any agent that binds to opioid receptors found principally in the central nervous system and gastrointestinal tract. ...

Physical therapy is also an important part of treatment, though it should be noted that many patients are incapable of participating in physical therapy due to subsequent muscular and bone problems. People struggling with RSD often develop guarding behaviors where they avoid using or touching the affected limb. Unfortunately, inactivity can exacerbate the disease and perpetuate the pain cycle. Physical therapy works best for some patients, especially goal-directed therapy, where the patient begins from an initial point, regardless of how minimal, and then endeavors to increase activity each week. While the unpredictability of this illness often causes a frustrating pattern of progress and regress, it is essential to continue to try to increase and normalize physicial activity.

Similar disorders

RSDS has many of the same features as causalgia, such as severe burning pain that is aggravated by physical or emotional stimuli. However, causalgia usually affects the lower limbs, the palm of the hand or the sole of the foot; RSDS may strike any part of the body.

RSDS also has characteristics similar to those of other disorders, such as shoulder-hand syndrome, which sometimes occurs after a heart attack and is marked by pain and stiffness in the arm and shoulder; Sudeck's syndrome, which is prevalent in older people and in women and is characterized by bone changes and muscular atrophy, but is not always associated with trauma; and Steinbrocker's syndrome, which affects both sexes but is slightly more prevalent in females, and includes such symptoms as gradual stiffness, discomfort, and weakness in the shoulder and hand.

Current research

The National Institute of Neurological Disorders and Stroke (NINDS), a part of the National Institutes of Health (NIH), supports and conducts research on the brain and central nervous system, including research relevant to RSDS, through grants to major medical institutions across the country. NINDS-supported scientists are working to develop effective treatments for neurological conditions and, ultimately, to find ways of preventing them.Investigators are studying new approaches to treat RSDS and intervene more aggressively after traumatic injury to lower the patient's chances of developing the disorder. In addition, NINDS-supported scientists are studying how signals of the sympathetic nervous system cause pain in RSDS patients. Using a technique called microneurography, these investigators are able to record and measure neural activity in single nerve fibers of affected patients. By testing various hypotheses, these researchers hope to discover the unique mechanism that causes the spontaneous pain of RSDS and that discovery may lead to new ways of blocking pain.Other studies to overcome chronic pain syndromes are discussed in the pamphlet "Chronic Pain: Hope Through Research," published by the NINDS. The National Institute of Neurological Disorders and Stroke is a part of the U.S. National Institutes of Health. ... An axon, or nerve fiber, is a long slender projection of a nerve cell, or neuron, which conducts electrical impulses away from the neurons cell body or soma. ...

Further information

• RSD Support Group
• Forgrace.org
• rsdhope.org

Based on http://www.ninds.nih.gov/health_and_medical/pubs/rsds_fact_sheet.htm (in the public domain)

Above site was reorganised. Further info now available at http://www.ninds.nih.gov/disorders/reflex_sympathetic_dystrophy/reflex_sympathetic_dystrophy.htm