Word: diagrams
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...into two main classes: blockages and aneurysms. Blockages may be almost anywhere-in the greatest vessel of all, the aorta, in the coronary arteries embedded in the heart wall itself, in arteries leading to the legs, and in the carotid and vertebral vessels carrying blood to the brain (see diagram, opposite page). The brain itself, however, is the province of the neurosurgeons...
...models of assistant ventricles have been produced steadily, in improved shapes and for both ventricles (see diagram, left). It is only seven weeks ago that the DeBakey team ran what it thought was a highly successful experiment with a unit that replaced both of a dog's ventricles. Yet progress in the field is so fast that within four days the researchers were dismissing their test as old hat. They were getting as good or better results with a single ballooning sac inserted in the left ventricle alone. It seems, says Dr. Hall, that this may be enough...
...likely to take over and get the rest of the circulatory system, including the three other chambers, to work effectively in unison. However, if both left and right ventricles have been severely damaged, they might be replaced by a two-in-one prosthesis with a single pump (see diagram, right...
...body's powerful muscles, perhaps in the shoulder girdle, to such a pacemaker. Then, when the little device gives its electrical command, the muscle will contract, and in the process it will squeeze an implanted bellows, which in its turn will squeeze the left ventricle or both (see diagram, center). Like all gadgeteers, the heart researchers also dream of using atomic power...
...PITUITARY GLAND. Just about the hardest part of the body for a surgeon to get at is the pea-sized pituitary gland (see diagram), producer of a few master hormones that govern the production of dozens of "slave" hormones. An overactive pituitary causes Cushing's syndrome, some forms of gigantism and adult overgrowth, and some cases of virilism in girls and women. Removal or deactivation of even a normally active pituitary helps some patients with advanced cancer of the breast or prostate, and diabetes victims going blind from bleeding of retinal arteries...