Comparative study reveals photoplethysmography detects upper-limb vascular blood redistribution during brachial occlusion missed by laser Doppler, suggesting enhanced monitoring utility.
Key Points
To evaluate differences between raw photoplethysmography and laser Doppler flowmetry signals in tracking upper-extremity cutaneous hemodynamics during a brachial artery occlusion test.
Monitored cutaneous hemodynamics across multiple locations on the hand during brachial arterial occlusion.
Compared raw photoplethysmography (PPG) signals with conventional laser Doppler flowmetry (LDF) blood flow measurements.
Raw PPG signals captured extensive blood redistribution among the arterial, microcirculatory, and venous beds across different hand locations during occlusion.
Conventional LDF blood flow parameters demonstrated lower sensitivity to microvascular changes and failed to detect this vascular redistribution.