Abstract
The most frequent cause for misinterpretation of the electrocardiogram results from the belief that certain changes in the QRST complex are specific for myocardial disease. A list, admittedly incomplete, of 47 conditions not due to primary heart disease but which may be associated with changes in the electrocardiogram similar to those due to diffuse myocardial disease is presented in proof of the non-speeificity of these changes.