Hoover's sign was described by Dr. Charles Franklin Hoover more than 100 years back to differentiate between the organic and functional weakness of pyramidal origin. This test is usually performed in the lower limbs and is valuable when on bedside one is not sure about the nature of hemiparesis. A subject with hemiparesis of organic cause while asked to flex the hip of normal leg against resistance will not exert pressure on the hand of examiner placed under the heel on the affected side while in hysterical weakness heightened pressure will be felt on the examiner's hand. The presumed genesis of this sign could be the crossed extensor reflex or the principle of synergistic contraction. It is a useful clinical test in differentiating functional and organic paresis with moderate sensitivity (63%) and high specificity (100%), but there are some limitations which should be kept in mind while evaluating a patient.
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机译:一百多年前的查尔斯·富兰克林·胡佛(Charles Franklin Hoover)博士对胡佛的星座进行了描述,以区分金字塔起源的有机和功能弱点。该测试通常在下肢进行,当在床边不确定偏瘫的性质时,该测试很有价值。具有器质性偏瘫的受试者被要求弯曲正常腿的髋部以抵抗阻力时,不会在受累侧脚后跟下方的检查员的手上施加压力,而在歇斯底里虚弱时会在检查员的手上感觉到压力升高。该体征的推测起源可能是交叉伸肌反射或协同收缩原理。这是区分功能性和有机性轻瘫的有用临床测试,灵敏度中等(63%),特异性高(100%),但是在评估患者时应牢记一些限制。
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