Mass screening surveys for various types of major disease have been increasingly used and found variously useful in recent years. It is generally agreed that a simple, inexpensive, reliable screening technique for the detection of heart disease in mass surveys would be valuable. Such a technique should ideally yield a very large percentage of "positive" results in those with heart disease (whether known or unknown) and a very small percentage of "false positive" results in those without heart disease.
Coronary heart disease, especially in the older age groups, forms a very large percentage of all cases of heart disease. Master and others found that "at least 40% of patients with coronary disease do not present any objective evidence of heart disease." Their examination included a resting 12-lead electrocardiogram. White has stated that "nearly one fourth of all cases of angina pectoris show an apparently normal heart by all methods of