Judah Marmor, M.D.
JAMA. 1941;117(21):1807. doi:10.1001/jama.1941.02820470054026.
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Note.—  This letter was referred to the authors, who reply:

To the Editor:—  In the writing of our report Dr. Sapirstein and I had seriously weighed the question of whether or not the polycythemia had been a significant predisposing factor for the thrombosis and after thorough consideration had come to the conclusion that it had not. Our opinion was based chiefly on the fact that the hematocrit test was within normal limits, which is not the case in true polycythemia. This seemed to indicate that we were dealing merely with a high normal blood count of no particular pathogenic significance, and we concluded, therefore, that the advanced cerebral arteriosclerosis was the important predisposing factor in our case.Nevertheless, we would agree that the statement expressed by your correspondent is a valid one, namely that "in elderly persons with polycythemia, carotid sinus stimulation should be performed with caution." We would


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