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Differences in blood pressure between the two arms are very common, especially in unilateral conditions, previously termed the differential blood pressure sign.
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Highlights historical precedence in observing blood pressure differences between arms.
To the Editor: —I have read with interest the article by Dr. V. C. Kinney on "Some Original Blood Pressure Observations" (The Journal, Nov. 1, 1924). Dr. Kinney's opening remarks about there being differences in the blood pressures on the two sides of the body are, however, liable to give the impression that he considers he is the discoverer of this fact. I therefore beg to point out that several years ago I published observations on the blood pressures in the two arms, showing that differences were very common, especially in unilateral conditions, and to these variations, when present, I gave the name of the "differential blood pressure sign." The results of 819 observations were published in theQuarterly Journal of Medicine(13:148-164 [Jan.] 1920), and a further series of 1,897 observations in the same journal (14:309-313 [July] 1921). These results have been confirmed by my brother D.
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Edgar F. Cyriax (1925) conducted a letter in Blood pressure variations. Blood pressure measurement in two arms was evaluated on Differences in blood pressure on the two sides of the body. Differences in blood pressure between the two arms are very common, especially in unilateral conditions, previously termed the differential blood pressure sign.
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