题干

     As a young man, Tom was a famous artist with a wife and two fine sons. One night, his older son was ill. Tom and his wife thought it was nothing serious. But the boy died suddenly that night..

    After his son died, Tom always felt very sad. To make matters worse, his wife also left him later, leaving him alone with his six-year-old younger son, Emie. Sadly, he turned to alcohol(酒) for help.

    As time went by, Tom began to lose everything he had——his land, house, etc. A few months later, Tom passed away alone in a small bar. Hearing of Tom's death, I thought,“What a complete failure!”

   But later, I began to change my earlier opinion. I knew Tom's now adult son, Emie. He is one of the kindest, most caring men. I saw the love between Emie and his children. And I thought that kindness and caring had to come from somewhere.

    One day, I asked him what made him become such a specia1 person. Emie said quietly, “My father came into my room every night, give me a kiss and said,“love you, son.”

     Hearing his words, I understood everything. Tom didn't leave many things behind. But he had been a kind loving father, and left behind his best love.

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冷冻疗法挽救生命

    ①登山或潜水运动员都深知寒冷给身体带来的危害。然而,作为一种医学治疗手段,降低体温可以减少心脏病患者在接受使用体外循环机进行的手术时造成脑部后遗症的风险。

    ②伴随心脏问题产生的是由于缺氧而造成的大脑损伤。缺氧5分钟就会给大脑带来不可挽回的破坏,10分钟即可造成神经死亡。美国心脏学会建议,在手术中有控制地降低体温以减少脑部损伤。这种疗法的关键在于循序渐进地把体温降至35摄氏度以下。因为体温每降1摄氏度,氧气的消耗量就会降低5%~8%。西班牙马德里心脏外科主任恩里克·罗德里格斯指出:“在所有使用体外循环机的外科手术中,我们都会用到适中的降低体温的做法,也就是说,降至28摄氏度至31摄氏度之间,以避免在出现危险时给大脑造成损伤。”

    ③此外,冷冻疗法可以延长手术的安全时间。例如在成人主动脉切断或儿童先天性心脏病的手术治疗中,需要完全中断血液循环。为此需要把患者的身体冷冻起来,使之接近冬眠状态。当体温降至20摄氏度的时候,医生有半小时的安全时间进行手术;当体温降至16摄氏度时,安全时间为40分钟至60分钟。心脏外科助理医师卡洛斯·莫拉莱斯指出:“体温降得越低,我们进行安全手术的时间就越充裕,成功的几率也更大。”

    ④但是,控制体温的同时,也蕴涵着一定的风险。冷冻疗法最困难的一个环节是手术后如何使体温回升。按照一般规则,如果身体被冷冻30分钟,那么手术后的恢复时间就将增加一倍。负责将血液重新灌注到血管当中的医师需要在短时间内迅速地使患者体温回升。如果体温在28摄氏度以下,那么产生心室纤维性颤动的风险就会很高。恩里克·罗德里格斯说:“尽管这些威胁依然存在,但是目前医学界使用冷冻疗法遇到的最大问题是可能出现的大脑水肿和血凝紊乱,因为低温破坏了血液蛋白。”重症监护室中的最大难题通常是痉挛和寒热增加的氧气消耗,以及患者免疫系统的改变。因此专家建议给接受了冷冻疗法的患者实施镇静辅助治疗,使用抗生素,特别是在冷冻时间长达几天的情况下。

(摘自《参考消息》2008年3月)

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