Pulse Amplitude Ratio PAR

During occlusion peripheral resistance is substantially reduced leading to a pronounced post-occlusive hyperemia in distal arterial segments. Several testing variants are available evaluating perfusion or tone of the digital arteries by arterial volume or photo plethysmography. As the latter method is based on different physiological mechanisms compared to FMD, only a loose correlation to FMD could be shown. Yet peripheral arterial tone testing may have predictive value in assessing cardio-vascular risk. One commercially available variant of this technique, although less demanding than FMD testing, requires the use of expensive disposables sensors.

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