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Heart Disease Observed: Thus, this kind of heart disease has been practically eradicated, although 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 congenital heart disease made up only 1.5% of all of 3,000 patients with Signs or symptoms of heart disease.
Although most of the causes of heart disease observed in the first quarter of the 20th century are still present, their relative proportions have changed considerably, and some causes that were mentioned only occasionally or not at all at that time are considered common today. This is especially true of the virus infections. In some parts of the world the diagnosis of "heart disease of unknown origin" is a common one. In the United States such a diagnosis exists but is uncommon, and a few kinds of heart disease that are common in certain other countries are rare or nonexistent in the United States. For example, Chagas' disease (myocardial trypanosomiasis) is a parasitic infestation of the heart common in South America.
Infectious Types of Heart Disease. During the early 1900's infectious types of heart 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 diseases in the United States are rheumatic heart disease and syphilitic heart disease.
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