2008年职称英语考试概括大意和完成句子习题(十九)
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Surgery Involving the Heart 1. The heart-lung machine (pump-oxygenator) is a valuable addition to the modern operating room. This machine has made it possible to perform many operations on the heart and other thoracic organs which could not otherwise be done. There are several types of machines in use, all of which serve as a temporary substitute for the patient’s heart and lungs. 2. The machine siphons off the blood from the large vessels entering the heart on the right side so that no blood passes through the heart and lungs. The blood is returned to the general circulation for body distribution through one of the large arteries. While passing through the machine, the blood is oxygenated by means of an oxygen inlet, and carbon dioxide is removed by various chemical means. These are the processes that normally take place between the blood and the air in the lung tissue. While in the machine, the blood is also “deformed” to be sure that all air bubbles are removed, since such bubbles could be fatal to the patient by obstructing blood vessels. An electric motor in the machine serves as a pump during the surgical procedure to distribute the processed blood throughout the body by means of the artery mentioned above. 3. Diseased valves may become deformed and scarred from endocarditic so that they are ineffective and often obstructive. In some cases a special small knife can be inserted into the heart chamber and the valve can be cut so that it no longer obstructs the blood flow. The valve may even become partially functional. In other cases there may be so much damage that replacement is the only resort. Substitute vales made of plastic materials have proved to be a lifesaving measure for many patients. Very thin butterfly valves made of Dacron or other synthetic material have also been successfully used. 4. Artificial hearts or parts of hearts designed to assist the ventricles in their pumping function have not proved as successful as the artificial valves. However, research continues and it is quite possible that an effective device may soon be ready for use. More spectacular is the transplantation of a human heart from the body of a person who has recently died. Tissues of the donor and the recipient should be as closely matched as possible to avoid rejection by the recipient’s antibody mechanism. This rejection syndrome is the most serious problem related to heart transplants. 练习： 1.Paragraph 1 _____ 2.Paragraph 2 _____ 3.Paragraph 3 _____ 4.Paragraph 4 _____ A. The Heart Transplantation B. How the Heart-lung Machine Works C. A Machine Making Many Kinds of Thoracic Operations Possible D. A Temporary Substitute for the Diseased Valve E. Operations on Cardiac Valves and Substitutes for Valves F. How Every Part of the Heart Performs Its Function 5.The blood is oxygenated and carbon dioxide in it is removed _____. 6.The heart-lung machine is an essential helper for surgeons _____. 7.Endocarditis may cause valves to be damaged ____. 8.It is extremely important in heart transplantation _____. A. and finally they fail to function properly B. to perform many surgical operations on the chest C. when it passes through the heart-lung machine D. and they no longer obstruct the blood flow E. to match tissues of the donor and the recipient F. when the ineffective valves are replaced by artificial ones |
