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To the Editor:
—In reviewing oscillometric curves taken at various levels in cases of thrombo-angiitis obliterans as well as in cases of peripheral thromboses and emboli, and comparing these readings at corresponding levels in the unaffected limb, an interesting observation was made. It was noted that the oscillometric index at the point just proximal to the point of occlusion was definitely and consistently larger than the index at the same level in the unaffected limb. This did not hold true when the obstructive lesion was sclerotic in character.An explanation of this phenomenon is seen when one reviews the hydrodynamics of the peripheral circulation, so well described by Dr. W. Wayne Babcock (Am. J. Surg. 16: 401 [June] 1932). When the velocity of the blood flow is increased, the wall pressure decreases. With occlusion of the vessel, the blood flow velocity is decreased to zero and therefore the wall pressure
Beck WC. THE OSCILLOMETRIC INDEX PROXIMAL TO VASCULAR OCCLUSION. JAMA. 1932;99(10):849. doi:10.1001/jama.1932.02740620059028
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