The arterial pressure wave at the level of the ankle was reconstructed from noninvasive data in 48 limbs of patients with normal circulation, a minor arterial stenosis, major arterial stenosis, and complete occlusion. The mean systolic slope of the arterial pressure wave was calculated. It was an accurate index for the detection of arterial stenosis or occlusion. This method is noninvasive, easily repeatable, and simple.
Johnston KW, Kakkar VV. Noninvasive Measurement of Systolic Pressure Slope: A Reliable Index of the Presence of Peripheral Arterial Occlusive Disease. Arch Surg. 1974;108(1):52–56. doi:10.1001/archsurg.1974.01350250044012
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