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With every new technical procedure, there is always the danger of reading too much or too little into it. This monograph presents clearly the controversial issues of electrocardiography, and its bibliography is an excellent guide for more intensive reading. The book should prove invaluable to the large group of internists who use the electrocardiograph in their daily work. It is not a book for beginners. But the persons who read electrocardiograms and who are puzzled by the diversity of patterns and by the "borderline" group will find it a helpful guide.
The chapter on left and right strain is particularly arresting. Time alone will determine the truth of Dr. Barnes's view on this phase.
When first introduced, the claims for the fourth lead made many men suspicious to the point of avoiding its use. Dr. Barnes's correlation of this lead with old standard leads is sound and refreshing. The chapter
Electrocardiographic Patterns. Arch Intern Med (Chic). 1941;67(1):240. doi:10.1001/archinte.1941.00200010250018
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