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THE CAUSES OF THE VARIATIONS OF THE CARDIOAORTIC OR “PRESPHYGMIC” INTERVAL.

A. T. KEYT, M.D.
JAMA. 1883;I(23):661-668. doi:10.1001/jama.1883.02390230001001.
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Chapter III. One of the outcomes of the simultaneous graphic method has been the demonstration and measurement of an interval of time between the beginning of ventricular contraction or systole and opening of the aortic valves, or beginning of the aortic pulse. The term “presphygmic,” applied to this interval by the author, appears well chosen, as expressing the phase of ventricular systole which precedes the rise of the arterial pulse. This term and “cardio-aortic/p=''/ or “ventriculo-aortic,” will be used synonymously in this article. Observations relating to the presphygmic interval must necessarily be made on man between the pointof of ventricular beat and the point of pulsation of a near artery, as the carotid, or subclavian; the former being usually selected as more accessible for exploration. To get the presphygmic interval in its purity, it is only required to deduct from the full cardio-carotid interval the brief transmission interval of the

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