Heart Devices

69 促使切尼副总统心脏跳动的机械装置

DATE=7-17-01
TITLE=SCIENCE IN THE NEWS #2133 - Heart Devices
BYLINE=Jerilyn Watson

VOICE ONE:
This is Sarah Long.
VOICE TWO:
And this is Steve Ember with Science in the News, a VOA Special English program about recent developments in science.  Today we tell about a (1)patient who received a new kind of (2)mechanical heart.  And we tell about a device (3)implanted in Vice¹ President Dick Cheney to make his heart beat normally. 
((THEME))
VOICE ONE:
Earlier this month, American doctors placed a mechanical heart in the chest of a patient dying of heart (4)disease. The new device has no (5)wires or (6)tubes (7)connected to (8)equipment outside the body. It was the first such implant² ever placed in a human.
The mechanical heart is called an AbioCor.  It (9)contains a (10)pump that forces blood through the device to replace normal heart action.  (11)Abiomed Incorporated of Danvers, (12)Massachusetts developed the mechanical heart.  It is made of (13)titanium and plastic.  It weighs less than one kilogram. 
Laman Gray and Robert Dowling placed the AbioCor in the patient at (14)Jewish Hospital in (15)Louisville, (16)Kentucky. The operation took seven hours.  Its goal was to permit the patient to live a month or two longer. 
Hospital officials identified the patient only as a man in his fifties.  He had (17)suffered several damaging heart attacks.   Examinations showed he had only days or weeks to live.  He also had (18)diabetes and (19)kidney failure.  This prevented him from receiving a human heart.  
VOICE TWO:
During the operation, Doctor Gray and Doctor Dowling (20)removed most of the man's diseased heart.  Then they connected the AbioCor to the two upper parts of the remaining heart, the left and right (21)atria.  The doctors connected the mechanical heart to the (22)aorta, the main (23)artery³ to the body. They also connected the device to the (24)pulmonary artery, which carries blood to the lungs. 
Unlike a human heart, the (25)rhythm of the AbioCor depends on the level of (26)blood pressure in the arteries⁴.  The human heart pumps blood to the body and lungs at the same time.  The AbioCor works differently. It pumps blood to the body.  Then it pumps blood to the lungs.  Then it pumps blood to the body again. 
The AbioCor receives power from a (27)battery worn on the body. The patient wears this battery pack around the waist, like a belt.  It sends power across the skin to another battery inside the (28)abdomen. 
Doctor Gray noted⁵ that the patient's body does not (29)reject the mechanical heart because it does not contain (30)foreign (31)tissue.
VOICE ONE:
Space engineers helped develop the AbioCor. They designed it to prevent (32)blockages in blood (33)vessels that cause (34)strokes. They also designed it to prevent (35)infections.  These conditions harmed patients who received earlier mechanical hearts.
The earlier devices depended on tubes from the patient to machines outside the body. Infections developed because the patient always had an open wound.  And the patient could not move around without also moving the equipment.
(36)The federal government approved the AbioCor earlier this year for experimental use. Its (37)developers say the goal of the device is to give (38)severely sick patients another one to five years of life.  But Abiomed officials also said they would consider their invention successful if the patient in Kentucky survived for sixty days. This is because his condition was so poor before receiving the device.  Doctors also want to learn if the implant causes pain or robs the patient of any (39)mental abilities.
Several other patients with severe heart disease also may receive the mechanical hearts.  Four other hospitals in the United States have been chosen to perform AbioCor implant operations.  
VOICE TWO:
Experts not (40)involved in the AbioCor implant disagreed about its value.  Some doctors praised the AbioCor as a major development in treatment of heart disease.  They said the mechanical heart could keep patients alive while they wait to receive a human heart.
Other experts said better tools than the AbioCor are currently in use. For example, some patients with severe heart disease receive (41)ventricular (42)assist devices.  Doctors implant this device in the patient's chest without removing the heart.  It helps the heart work better. Doctors have used ventricular assist devices for ten years. 
The first (43)permanent mechanical heart was placed in a human patient in the United States in Nineteen-Eighty-Two. Robert Jarvik invented this device, the Jarvik-Seven.  It was implanted in the chest of a man named Barney Clark. The Jarvik-Seven had tubes from the patient to large equipment outside his body. Mister Clark lived one-hundred-twelve days after the operation.  During that time he suffered kidney failure and other severe problems.
((MUSIC BRIDGE))
VOICE ONE:
You are listening to the Special English program SCIENCE IN THE NEWS on VOA.  This is Sarah Long with Steve Ember in Washington.
((MUSIC BRIDGE))
VOICE ONE (CONT):
Doctors in Washington, D.C. recently placed a special heart device in the chest of Vice President Dick Cheney.  The goal was to help his heart beat normally.  Mister Cheney had the operation at George Washington University Hospital.  Doctors performed the operation to prevent trouble with the rhythm of his heart.
Mister Cheney is sixty years old.  He has suffered four heart attacks in the last twenty-three years.  This was the third operation to treat a heart problem since he was elected vice president in November. 
The vice president received a device called an (44)implantable (45)cardioverter (46)defibrillator or I-C-D. The electrical device has two (47)purposes.  One is to keep the heart beating at a normal rate. The other is to prevent the heart from (48)fibrillating.  (49)Fibrillation is a dangerous process in which the heart beats wildly out of control.  So the device is both a (50)pacemaker and (51)defibrillator.  A pacemaker speeds up a heart that is beating too slowly.  A defibrillator prevents death from a wildly beating heart. 
VOICE TWO:
Doctors placed the small I-C-D in Mister Cheney's body through a cut in the chest below the shoulder. The I-C-D records heart activity through wires called (52)leads.  These leads are passed through (53)veins into the heart.   There they act like a computer as they (54)document heart action.
An I-C-D speeds a patient's heartbeat if it falls below forty beats each minute.  The device also slows the heartbeat if it becomes faster than one-hundred beats a minute.  And the I-C-D sends more electricity if the heart starts beating out of control. This additional electricity can stop abnormally wild, fast heartbeats before they become deadly. 
When the device (55)detects harmful rhythms, it sends a (56)shock of electricity through the leads to correct the rhythms. Sometimes the patient does not feel this. Other times it can feel like being hit in the chest.
VOICE ONE:
Almost sixty-eight-thousand people around the world received I-C-D devices last year. The vice president decided⁷ to have the I-C-D after being examined by a heart (57)monitor.  This device records the electrical (58)performance of the heart.   Mister Cheney wore it for thirty-four hours.  His doctor observed that Mister Cheney's heart beat abnormally fast four times during the test. 
This abnormal activity is called (59)ventricular (60)tachycardia.  It happens when the main pumping part of the heart beats too quickly. Mister Cheney then had another test called an (61)electrophysiology study. This test (62)confirmed his need for the I-C-D. 
The vice president returned to work less than forty-eight hours after receiving his I-C-D. 
VOICE TWO:
Dick Cheney had his first heart attack at age thirty-seven. He suffered his most recent heart attack last November.  Doctors told him that that one artery was almost completely (63)blocked.  They placed a small metal tube device inside the artery to keep it open.  This device is called a stent.
VOICE TWO (CONT):
Mister Cheney went to the hospital again after suffering chest pains in March.  The doctors found a one-(64)millimeter area of (65)narrowing at one end of the stent. The doctors opened the blocked area using a method called balloon (66)angioplasty.
Vice President Cheney's heart trouble has caused some observers to question whether he can finish his term in office.  But his doctors and other experts say Mister Cheney should be well enough to carry out his duties as vice president. 
((THEME))
VOICE ONE:
This SCIENCE IN THE NEWS program was written by  Jerilyn Watson.  It was produced by Caty Weaver⁸ with audio assistance by Tracy # This is Sarah Long.
VOICE TWO:
And this is Steve Ember.  Join us again next week for more news about science in Special English on the Voice of America.

(1)patient [ 5peiFEnt ] n.病人, 患者
(2)mechanical [ mi5kAnikl ] adj.机械的
(3)implant [ im5plB:nt ] v.植入
(4) disease [ di5zi:z ] n.疾病
(5)wire [ 5waiE ]n.金属丝, 电线
(6)tube [ 5tju:b ]n.管, 管子
(7)connect [ kE5nekt ] v.连接
(8)equipment [ i5kwipmEnt ] n.装备, 设备, 器材
(9)contain [ kEn5tein ] vt.包含
(10)pump [ pQmp ] n.泵
(11)Abiomed Incorporated of Danvers n. 丹佛阿比奥姆德联合公司
(12)Massachusetts [ 7mAsE5tFu:sits ] n.麻萨诸塞州
(13)titanium [ tai5teinjEm, ti- ] n.[化]钛
(14)Jewish [ 5dVu(:)iF ] adj.犹太人的
(15)Louisville [ 5lu(:)ivil ] 路易(斯)维尔[美国肯塔基州北部城市]
(16)Kentucky [ ken5tQki ] n.肯塔基州
(17)suffer [ 5sQfE ] vt.经历
(18)diabetes [ 7daiE5bi:ti:z, -ti:s ] n.[医] 糖尿病, 多尿症
(19)kidney failure [ 5kidni ] [ 5feiljE ] 肾衰竭
(20)remove [ ri5mu:v ] vt.移开
(21)atria [ 5eitriE ] [解]心房,心耳
(22)aorta [ ei5C:tE ] n.大动脉
(23)artery [ 5B:tEri ] n.动脉, 要道
(24)pulmonary [ 5pQlmEnEri ] adj.肺部的
(25)rhythm [ 5riTEm, 5riWEm ] n.节奏
(26)blood pressure n.血压
(27)battery [ 5bAtEri ] n.电池
(28)abdomen [ 5AbdEmEn; Ab5dEumEn ] n.腹, 腹部
(29)reject [ ri5dVekt ] vt.排斥
(30)foreign [ 5fCrin ] [医]异质的
(31)tissue [ 5tisju: ] [生]组织
(32)blockage [ 5blCkidV ] n.堵塞
(33)vessel [ 5vesl ] n.脉管
(34)stroke [ strEuk ] n.打击
(35)infection [ in5fekFEn ]n.[医] 感染
(36)federal government n.联邦政府
(37)developer [ di5velEpE ] n.开发者
(38)severely [ si5viEli ] adv.剧烈地
(39)mental [ 5mentl ] adj.精神的
(40)involve [ in5vClv ] vt.包括于
(41)ventricular [ ven5trikjulE ] adj.心室的, 膨胀的
(42)assist [ E5sist ] v.辅助
(43)permanent [ 5pE:mEnEnt ] adj.永久的, 持久的
(44)implantable [Im`plB:ntEbl;-`plAn-]adj.[医]可植入的
(45)cardioverter [9kB:dIEJ`v:tE(r)]n.[医]心律转变器
(46)defibrillator [ dI`fBIbrIleItE(r) ] n.[医](电击)去纤颤器
(47)purpose [ 5pE:pEs ] n.用途
(48)fibrillate [ 5faibrileit ] adj.有原纤维的,有原纤维组织的
(49)fibrillation [ 7faibri5leiFEn ] n.[医]纤维性颤动, 心室纤维颤动
(50)pacemaker [ 5peismeikE ] n.起搏器
(51)defibrillator [ dI`fBIbrIleItE(r) ] n.[医](电击)去纤颤器
(52)lead [ li:d ] n. 导线
(53)vein<sup>6</sup> [ vein ] n.血管
(54)document [ 5dCkjumEnt ] v.存档
(55)detect [ di5tekt ] vt.探测
(56)shock [ FCk ] n. 震动
(57)monitor [ 5mCnitE ] n.监视器
(58)performance [ pE5fC:mEns ] n.运行
(59)ventricular [ ven5trikjulE ] adj.心室的, 膨胀的
(60)tachycardia [ 7tAki5kB:diE ] n.[医]心动过速
(61)electrophysiology [I`lektrEJ9fIzI`ClEdVI]n.[物]电生理学
(62)confirm [ kEn5fE:m ] vt.确定
(63)block [ blCk ] vt. 阻塞
(64)millimeter [5mIlImi:tE(r)]n.毫米
(65)narrowing [ 5nArEuiN ] n.窄化, 变窄
(66)angioplasty [9AndVIEJsB:`kEJmE]n.[医]血管肉瘤

1 vice   

n.坏事；恶习；[pl.]台钳，老虎钳；adj.副的

参考例句：

• He guarded himself against vice.他避免染上坏习惯。
• They are sunk in the depth of vice.他们堕入了罪恶的深渊。

2 implant   

vt.注入，植入，灌输

参考例句：

• A good teacher should implant high ideals in children.好教师应该把高尚理想灌输给孩子们。
• The operation to implant the artificial heart took two hours.人工心脏植入手术花费了两小时。

3 artery   

n.干线，要道；动脉

参考例句：

• We couldn't feel the changes in the blood pressure within the artery.我们无法感觉到动脉血管内血压的变化。
• The aorta is the largest artery in the body.主动脉是人体中的最大动脉。

4 arteries   

n.动脉( artery的名词复数 )；干线，要道

参考例句：

• Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
• This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》

5 noted   

adj.著名的，知名的

参考例句：

• The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
• Jim is noted for arriving late for work.吉姆上班迟到出了名。

6 vein   

n.血管，静脉；叶脉，纹理；情绪；vt.使成脉络

参考例句：

• The girl is not in the vein for singing today.那女孩今天没有心情唱歌。
• The doctor injects glucose into the patient's vein.医生把葡萄糖注射入病人的静脉。

7 decided   

adj.决定了的，坚决的；明显的，明确的

参考例句：

• This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
• There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。

8 weaver   

n.织布工；编织者

参考例句：

• She was a fast weaver and the cloth was very good.她织布织得很快，而且布的质量很好。
• The eager weaver did not notice my confusion.热心的纺织工人没有注意到我的狼狈相。