STANDARDIZATION OF PRECORDIAL LEADS
The American Heart Association and the Cardiac Society of Great Britain and Ireland have recently published joint recommendations bearing upon the standardization of a single precordial lead for routine use. Many workers employ multiple precordial leads and the use of such leads is rapidly increasing. The Committee on Precordial Leads of the American Heart Association feels, therefore, that it is desirable to make recommendations with reference to leads of this type. It wishes also to make public the considerations which led to the recommendations adopted.
MULTIPLE PRECORDIAL LEADS
When leads from two or more precordial points are employed, it is suggested that the precordial electrode be paired either with an electrode on the left leg or with a central terminal connected through equal resistances of 5,000 or more ohms to electrodes on the right arm, left arm and left leg. It is suggested further