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Inherited Disease: Muscular dystrophy is an¬other: it is a disorder believed to be an inherited abnormality in the chemistry of the body result¬ing in a degeneration of the muscle cells. As described by Francis H. C. Crick in the feature article "The Language of Life," sickle-cell anemia is an inherited disease of the blood that affects the chemical composition of the hemo¬globin in red blood cells. Hemophilia, another inherited blood disease, is characterized by the inability of the blood to clot properly. The "bleeder's disease," as hemophilia has been popularly called, has run through many of the royal families of Europe, including among its victims the young son of the last czar of Russia.
People display differing degrees of susceptibility to such other diseases as diphtheria, diabetes, and cancer. Certain kinds of cancsr, for example, seem to be more prevalent in some families than in others, but direct in-heritability has so far been demonstrated only in certain rare types. A "genetic predisposition to many of the psychosomatic diseases" has also been demonstrated (23, p. 79, 1955). Individual differences in susceptibil¬ity may be accounted for in part by environmental factors such as condi¬tions causing emotional stress and strain, and in part by structural weak¬ness, certain types of inherited constitution, and predisposition to the disease. For actual contraction of these diseases, there must be both sus¬ceptibility and exposure to the infectious agent and/or the environmental pressures. From the field of animal experimentation has come evidence that mice known to have inherited suscept'1 ility to Cancer do not de¬velop this disease when environmental conditions are properly controlled.See Also Known Disease -pro¬ducing:FMD' is caused and transmitted by a picorna virus (one of the smallest known disease -pro¬ducing disease-pro¬ducing organisms) of which there are seven major types and at least 50 subtypes. The great variety of strains is both a bane and a blessing to the veterinarian. Each strain has its own idio-syncracies in such characteristics as antigenic-ity and resistance to control. These differences, however, often aid the epidemiologist in pin¬pointing the geographic area from which the disease was transmitted.
Thus, this kind of heart disease has been practically eradicated, al¬though rare cases are still encountered in elderly people. Other endocrine disorders affecting the heart are very rare.
Congenital Heart Disease. With the increasing control of rheumatic heart disease it is probable that congenital cardiovascular disease will soon outstrip it in incidence, and with the increasing control of high blood pressure, congenital heart disease will take second place. An interesting statistical fact is that in the 1920's, T. Duckett Jones and Paul Dudley White found that con¬genital heart disease made up only 1.5% of all of 3,000 patients with Signs or symptoms of heart disease.
On The Other Hand See Heart Disease —this:He maintained that the causes of Heart disease —This disease deserve first priority since the prevention of Heart disease —This disease, the ulti¬mate goal, depends upon determining the causes. In a follow-up to this article, the American car-diologist Paul Dudley White published the first edition of his textbook Heart disease —This Disease (1931), emphasizing the etiological, or causative, diag¬nosis first, followed by structural and functional diagnoses in that order.
Infectious Types of Heart disease —This Disease. During the early 1900's infectious types of Heart disease —This disease were the greatest scourge, making up much more than half of all the cardiac cases. Today they account for less than a fourth of all cases in the United States and other countries that are equally prosperous and equally able to control infectious diseases. The two major infectious Heart disease —This diseases in the United States are rheumatic Heart disease —This disease and syphilitic Heart disease —This disease. |
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