Respiratory variations in pulse oximeter waveform amplitude are influenced by venous return in mechanically ventilated patients under general anaesthesia | European Journal of Anaesthesiology | Cambridge Core
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M430N-OFWH Innovo Deluxe iP900AP Fingertip Pulse Oximeter with Plethysmograph and Perfusion Index (Off-White with Black)
Respiratory effort from the photoplethysmogram - ScienceDirect
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Innovo Medical iP900AP Deluxe Fingetip Pulse Oximeter (Off-white)
Photoplethysmogram - Wikipedia
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Pulse oximetry based on photoplethysmography imaging with red and green light | SpringerLink