MURRAY WEINSTOCK, M.D.
To the Editor: Several questions may be raised regarding the data and conclusions of Spach, Barr, Blumenschein, and Boineau in "Clinical Implications of Isopotential Surface Maps" (Ann. Intern. Med. 69: 919, 1968).
They purport to show the advantage of isopotential mapping over electrocardiography and vectorcardiography, but they fail to show any electrocardiograms for comparison and only one vectorcardiogram.
Although the two single QRS complexes in Figure 1 were similar, they were not identical; the complex in the case of the right ventricular hypertrophy (RVH) had an R:S ratio of nearly 1, one of the electrocardiographic criteria for RVH (1). Additional
WEINSTOCK M. ISOPOTENTIAL SURFACE MAPS. Ann Intern Med. ;70:1048. doi: 10.7326/0003-4819-70-5-1048
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Published: Ann Intern Med. 1969;70(5):1048.
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