Editorial

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Abstract
Problems and uncertainties arising in the use of tables prepared to provide the range of variation of many features of normal ecg''s are pointed out. It is further emphasized that "normal" tracings may occur in patients with serious heart disease and that "abnormal" records are quite often seen in the absence of heart disease. The physician interpreting ecg''s can only judge their normality or abnormality as purely electrical records, and the physician responsible for the patient should use the interpretation in the light of all other clinical information. If the tracings are interpreted by individuals with knowledge and experience, the author believes the readings may properly include inferences relative to possible or probable diagnosis and not be a purely objective description of the records.

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