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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.
Which of the following titles best describes the content of the passage?
选项 A、The Therapeutic Value of Antipsychotic Drugs
B、The Tradeoff in the Use of Neuroleptic Drugs
C、The Connection between Psychotherapy and Neuroleptic Drugs
D、Recent Developments in the Treatment of Mental Illness
答案B
解析 主旨题。需要我们找出最适合于文章主题的选项。作者讨论了neuroleptic drugs的用途、它们的优点及副作用。最后，他提出了消除副作用的方法。B正确地反映了这种内容，单词tradeoff(平衡)很好地体现了这种意义。A的内容不完整，neuroleptic drugs有优点，但也有副作用。C所提及的内容仅是文章的一小部分，不完整，D的内容超越了主题的范围。文章仅是集中在如何使neuroleptic drugs的治疗作用 tradeoff，不是讨论近来精神病的总体治疗问题。
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