Abstract
A technique of recording electrocardiographic maps after exercise is described. This technique allows a measurement to be made of the area of ST segment changes that are projected onto the front of the chest after exercise. A comparison of the sensitivity and specificity of this technique with the orthogonal lead system and a single chest lead showed that praecordial exercise mapping was significantly superior to the other two lead systems in the diagnosis of ischaemic heart disease and may help in identifying patients with extensive disease. In addition information obtained from praecordial exercise mapping can be used to increase the data that are obtained from Holter monitoring of ST segments. The place of the technique in the management of medical and surgical treatment remains to be evaluated.
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