Abstract

Since its discovery, photoplethysmography (PPG) has been almost exclusively associated with pulse oximetry, a noninvasive and continuous technique measuring oxygen saturation levels in blood. This chapter will describe how PPG signals are utilized in pulse oximetry to measure blood oxygen saturation (SpO2). The chapter will also provide a snapshot on the capabilities and potentials of PPG in the clinical monitoring of oxygenation and perfusion. The first part of the chapter covers the principles, latest advancements, and applications of pulse oximetry, whereas the second part covers the application of PPG in measuring blood volume changes and perfusion among other parameters.

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