Word: aortic
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Dates: during 1940-1949
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...Kaplans were told that three successful aortic ring operations had been done at Massachusetts General Hospital. They drove to Boston, with an oxygen cylinder on the seat beside Sandy in case of emergency (it was not needed...
Last week, Dr. Richard Sweet opened 61-month-old Sandy's chest, tied off the front half of the aortic ring and cut it out. The arterial blood will pass through the rear half, which is expected to grow. On the danger list for 48 hours, Sandy was in an oxygen tent, breathing more soundly and soundlessly than ever before in her short life...
...patients, Dr. Smithy warned, could benefit from the new operation. The only good candidates are those who are young, suffering from stenosis (narrowing) of the mitral or aortic valves, with no active rheumatic involvement of the heart, and whose general health is good enough to make them reasonable operative risks...
...normal air, breathing is controlled by the respiratory centre in the medulla, which is part of the brain. But this centre is itself enfeebled by oxygen lack, passes control to secondary centres, the carotid bodies in the neck and the aortic body near the heart. Lack of oxygen stimulates instead of enfeebling these secondary centres, and they send out stronger and stronger impulses to the respiration muscles. If the lungs suddenly get more oxygen, the carotid and aortic bodies rest, turn back control to the centre in the medulla. But that stupefied centre may not be in shape to take...
When his heart contracts it throws a load of blood forward toward his head. "For the same reason that a discharged gun kicks one in the shoulder," said Dr. Starr, "the recoil throws the body feet-ward." An instant later, when the blood strikes the aortic arch (curve in large heart artery), "[the blood's] headward movement is arrested, creating an impact which throws the body and the table headward...