Key result
The phase relation between respiratory induced intensity variations of the PPG signal and macrocirculation changed with ventilatory mode, indicating other mechanisms generate the RIIV signal.
Why the study?
Is macrocirculation the sole determinant of respiratory induced variations in the reflection mode photoplethysmographic signal?
Population
24 patients (12 under anaesthesia with positive pressure ventilation and 12 with spontaneous breathing)
Design
Other
Authors
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Macrocirculation is not the sole determinant of RIIV in reflection-mode PPG; hypothesis-generating for additional mechanisms and should not yet change practice.
Observational (n=24)
Is macrocirculation the sole determinant of respiratory induced variations in the reflection mode photoplethysmographic signal?
The study demonstrates that macrocirculation is not the sole determinant of respiratory-induced variations in reflection mode PPG signals, suggesting other physiological mechanisms are involved.
Nilsson et al. (2003) conducted an observational in Patients under anaesthesia and spontaneously breathing patients (n=24). Positive pressure ventilation vs. Spontaneous breathing was evaluated on Coherence and phase relation between respiratory induced intensity variations (RIIV) of the PPG signal and respiratory synchronous pressure variations in CVP, PVP and ABP. The phase relation between respiratory induced intensity variations of the PPG signal and macrocirculation changed with ventilatory mode, indicating other mechanisms generate the RIIV signal.
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