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  3. In the 1950s, the development of antipsychotic drugs called neuroleptics(抑制精神病药物)radically changed the clinical outlook for pati

In the 1950s, the development of antipsychotic drugs called neuroleptics(抑制精神病药物)radically changed the clinical outlook for pati

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问题    In the 1950s, the development of antipsychotic drugs called neuroleptics(抑制精神病药物)radically changed the clinical outlook for patients in mental institutions who had previously been considered hopelessly psychotic.  Daily medication controlled delusions and made psychotherapy possible. Many who otherwise might never have left institutions returned to society. Now physicians have learned that there is a price to be paid for these benefits. Approximately 10 to 15 percent of patients who undergo long-term treatment with antipsychotic drugs develop a cluster of symptoms called tardive dyskinesia(迟发性运动障碍 ), the most common symptoms of which are involuntary repetitive movement of the tongue, mouth, and face, and sometimes the limbs and trunk.
   Neuroleptic drugs interfere with the action of dopamine (多巴胺), an important neurotransmitter in the brain, by binding to the dopamine receptors of nerve cells, and dopamine is a prime suspect in the pathophysiology of schizophrenia. Large doses of drugs such as amphetamines(苯丙胺), which stimulate secretion of dopamine, produce a psychosis resembling schizophrenia.  Reducing the activity of this neurotransmitter alleviates the delusions that cause psychotic behavior. Although the inhibition of dopamine activity can control psychotic behavior, researchers now believe that the central nervous system of some patients adapts to long-term therapy by increasing the number of specific dopamine binding sites. The net result is dopamine hypersensitivity which is correlated with the subsequent appearance of tardive dyskinesia.
   The risk of developing tardive dyskinesia is not so great that doctors have considered abandoning the use of antipsychotic drugs. Patients generally are bothered only slightly by the physical side effects, though the abnormal movements are troubling and may hinder social adjustment. Additionally, early diagnosis and prompt discontinuation of the neuroleptics might decrease the incidence of the movement disorders. Unfortunately, without neuroleptic drugs, psychotic behavior returns. So researchers have tried to achieve a satisfactory balance between the two effects, lowering dosage to a level that minimizes movement disorders yet control psychosis. In a five-year study of twenty-seven psychiatric patients treated with neuroleptics representing all classes of antipsychotic drugs, researchers attempted to decrease drug doses to their lowest effective levels. Patient responses suggested that low to moderate doses of antipsychotic drugs could control psychoses just as well as high doses, and tardive dyskinesia symptoms stabilized and gradually diminished or completely disappeared.
   The fact that psychoses can be controlled at the same time that tardive dyskensia symptoms are reduced suggests that a drug more specifically affecting the mechanism of psychoses might not cause movement disorders. Sulpiride, a drug not available in the United States but widely used in Europe, where it was developed, may be one such alternative. The drug selectively blocks D-2 dopamine receptors, perhaps especially those in the limbic area of the brain, which is involved in emotion and behavior.  It does not adversely affect the adenylate ( 腺苷酸) cyclase ( 环化酶 )-linked D -1 dopamine receptors. Sulpiride has proven effective in the short term, but whether it suppresses tardive dyskenesia over a long period of treatment is not yet known.
It can be inferred that the primary danger of tardive dyskinesia is the______.
选项 A、psychological effect on the patient
B、long-term therapeutic use of drugs
C、addiction of a patient to dopamine
D、physical injuries caused by violent muscle spasms
答案A
解析 推论题，其正确答案不会具体地在文中找到，但从作者提供的材料里可以归纳出来。A是正确的答案。在第三段，作者说到physical effects of tardive dyskinesia是不严重的，但病人会被这种“effects”， bothered，还提及abnormal movement may hinder social adjustments，所以，据此我们可以推断the most serious problem is psychological。有了这样的理解，那么D的内容就显然不能成立。B是错的，因为long- term use是产生tardive dyskinesia的原因．不是副作用。C也是错的，因为dopamine是大脑的产物，而不是药品的副作用。
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