TAILIEUCHUNG - Chapter 025. Numbness, Tingling, and Sensory Loss (Part 5)

Touch localization is performed by light pressure for an instant with the examiner's fingertip or a wisp of cottonwool; the patient, whose eyes are closed, is required to identify the site of touch with the fingertip. Bilateral simultaneous stimulation at analogous sites (., the dorsum of both hands) can be carried out to determine whether the perception of touch is extinguished consistently on one side or the other. The phenomenon is referred to as extinction. Graphesthesia means the capacity to recognize with eyes closed letters or numbers drawn by the examiner's fingertip on the palm of the hand. Once. | Chapter 025. Numbness Tingling and Sensory Loss Part 5 Touch localization is performed by light pressure for an instant with the examiner s fingertip or a wisp of cottonwool the patient whose eyes are closed is required to identify the site of touch with the fingertip. Bilateral simultaneous stimulation at analogous sites . the dorsum of both hands can be carried out to determine whether the perception of touch is extinguished consistently on one side or the other. The phenomenon is referred to as extinction. Graphesthesia means the capacity to recognize with eyes closed letters or numbers drawn by the examiner s fingertip on the palm of the hand. Once again interside comparison is of prime importance. Inability to recognize numbers or letters is termed agraphesthesia. Stereognosis refers to the ability to identify common objects by palpation recognizing their shape texture and size. Common standard objects such as a key paper clip or coins are best used. Patients with normal stereognosis should be able to distinguish a dime from a penny and a nickel from a quarter without looking. Patients should only be allowed to feel the object with one hand at a time. If they are unable to identify it in one hand it should be placed in the other for comparison. Individuals unable to identify common objects and coins in one hand and who can do so in the other are said to have astereognosis of the abnormal hand. Localization of Sensory Abnormalities Sensory symptoms and signs can result from lesions at almost any level of the nervous system from parietal cortex to the peripheral sensory receptor. Noting the distribution and nature of sensory symptoms and signs is the most important way to localize their source. Their extent configuration symmetry quality and severity are the key observations. Dysesthesias without sensory findings by examination may be difficult to interpret. To illustrate tingling dysesthesias in an acral distribution hands and feet can be systemic in origin

• Y học thường thức
• Numbness
• Tingling
• Sensory Loss
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