Multiple Sclerosis
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Multiple sclerosis, or MS, is a disease of the central nervous system. The central nervous system is made up of the brain and spinal cord. Both have nerve fibers that are wrapped in a myelin sheath. In MS, the myelin sheath becomes inflamed and gradually is destroyed. With the destruction of the myelin sheath comes an array of symptoms that may include numbness or tingling, balance problems, weakness, muscle spasms, and blurred vision.
Anyone can develop MS, but many patients share the following characteristics. The majority experiences their first symptoms between ages 20 and 40. Caucasians are more than twice as likely as other races to develop MS. MS is two to three times more common in women as in men. MS is five times more common in temperate climates like those of the northern US, Canada, and Europe. And people whose close relatives have MS are more susceptible to developing the disease, but there is no evidence the disease is directly inherited.
No single test detects MS, which makes it difficult to diagnose. Symptoms can mimic those of a number of other conditions and they can change depending on the area of the central nervous system that loses myelin. Some symptoms of MS are numbness or tingling in parts of the body, usually an arm or leg, unexplained weakness, dizziness, and fatigue, and blurry vision, double vision or blindness.
To diagnose the disease, healthcare providers use a number of tools and tests to help rule out other causes. The first is medical history. In this procedure, the doctor asks about personal and family health history. The doctor also questions the patient about the symptoms, their duration, and their onset. In a Physical examination, the doctor runs tests that will determine the health of nerves and muscles. Doctors will also look for weakness in specific parts of the body. In a MRI, a patients body is placed within a magnetic field and scanned by radio waves. Doctors also take pictures of the brain or spine to see if there are any patches or scars on the myelin sheath. In CSF collection, the doctor will take a sample of the patients spinal fluid. Then doctors study the sample for abnormalities like an increase of white blood cells and high amounts of immunoglobulin G. In ERTs, doctors attach wires to a patients scalp. Then doctors can measure the speed of visual, hearing, and sensory pathways and can detect damaged areas of the brain.
The course of the disease is also uncertain. In general, though, the disease follows several known patterns. These patterns are grouped under the heading “chronic progressive MS.” Relapsing-remitting MS is a form of MS in which patients experience series of actively symptomatic periods called attacks followed by remissions. Secondary-progressive