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Determination of endothelial function by peripheral artery tonometry. This finger tip plethysmograph measures pulse volume amplitude (PVA) in the index finger of both hands at rest, during a 5 min arm occlusion and then postocclusion. The PVA index is the relative increase in PVA postocclusion in the active finger compared with the control finger. Values greater than approximately 1.4 are normal
