Abstract
The study concerned an optical tissue absorption sensor which, if applied at the chest as a novel region, offers a non-disturbing multiparametric monitoring of all three: cardiac activity, respiratory activity, and changes of the oxyhemoglobin saturation S. Contrary to the standard region (e.g., finger), the chest region yields the respiration activity and accelerated assessment of S, though restricted to relative changes. As a novelty, the mutual interrelations between the respiratory activity and light absorption are discussed. The non-distal sensor could be combined with indispensable thoracic sensors, making distal oxygen sensor redundant if the determination of changes of S is sufficient.
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