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TABES DORSALIS
Tabes dorsalis is a slow degeneration of the nerve cells and nerve fibers that carry sensory information to the brain. The degenerating nerves are in the dorsal columns of the spinal cord (the portion closest to the back of the body) and carry information that help maintain a person's sense of position.Tabes dorsalis is a form of neurosyphilis, which is a complication of late stage syphilis infection. Syphilis is a bacterial infection that is spread sexually. When syphilis is untreated, the bacteria damages the spinal cord and peripheral nervous tissue. This leads to the symptoms of tabes dorsalis.Tabes dorsalis is the result of an untreated syphilis infection. Symptoms may not appear for some decades after the initial infection and include weakness, diminished reflexes, unsteady gait, progressive degeneration of the joints, loss of coordination, episodes of intense pain and disturbed sensation, personality changes, dementia, deafness, visual impairment, and impaired response to light. The disease is more frequent in males than in females. Onset is commonly during mid-life. The incidence of tabes dorsalis is rising, in part due to co-associated HIV infection.
Tabes dorsalis is a form of neurosyphilis, which is a complication of late stage syphilis infection. Syphilis is a bacterial infection that is spread sexually. When syphilis is untreated, the bacteria damages the spinal cord and peripheral nervous tissue. This leads to the symptoms of tabes dorsalis.Tabes dorsalis commonly progresses with neurological dysfunction including ataxia, paralysis, sensory and reflexes loss, bladder dysfunction, and loss of sexual function.In tabes dorsalis, the preganglionic portion of the dorsal roots of spinal nerves is infiltrated with lymphocytes and plasma cells, and invasion of treponema pallidum spirochetes to posterior columns of the spinal cord makes it atrophic.
Sign and symptoms
Signs and symptoms may not appear for decades after the initial infection and include weakness, diminished reflexes, paresthesias (shooting and burning pains, pricking sensations, and formication), hypoesthesias (abnormally diminished sense of touch), tabetic gait (locomotor ataxia), progressive degeneration of the joints, loss of coordination, episodes of intense pain and disturbed sensation (including glossodynia), personality changes, urinary incontinence, dementia, deafness, visual impairment, positive Romberg's test, and impaired response to light (Argyll Robertson pupil). The skeletal musculature is hypotonic due to destruction of the sensory limb of the spindle reflex. The deep tendon reflexes are also diminished or absent; for example, the "knee jerk" or patellar reflex may be lacking (Westphal's sign). A complication of tabes dorsalis can be transient neuralgic paroxysmal pain affecting the eyes and the ophthalmic areas, previously called "Pel's crises" after Dutch physician P.K. Pel. Now more commonly called "tabetic ocular crises", an attack is characterized by sudden, intense eye pain, tearing of the eyes and sensitivity to light.
"Tabes dorsalgia" is a related lancinating back pain.
"Tabetic gait" is a characteristic ataxic gait of untreated syphilis where the person's feet slap the ground as they strike the floor due to loss of proprioception. In daylight the person can avoid some unsteadiness by watching their own feet.
Treatment
Intravenously administered penicillin is the treatment of choice. Associated pain can be treated with opiates, valproate, or carbamazepine. Those with tabes dorsalis may also require physical therapy and occupational therapy to deal with muscle wasting and weakness.Preventive treatment for those who come into sexual contact with an individual with syphilis is important.
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