Why the study?
Does photoplethysmogram (PPG) amplitude correlate with beat-by-beat changes in arterial blood pressure and vascular compliance in anesthetized patients?
Does photoplethysmogram (PPG) amplitude correlate with beat-by-beat changes in arterial blood pressure and vascular compliance in anesthetized patients?
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Continuous photoplethysmography (PPG) amplitude monitoring provides a reliable, non-invasive surrogate for real-time beat-by-beat changes in arterial blood pressure and vascular tone during anesthesia.
In 26 anesthetized patients PPG amplitude, invasive arterial blood pressure, estimated vascular compliance (Cvasc) and Doppler resistive index (RI)/mean flow velocity (Vm) were recorded during changes in arterial blood pressure. These variables were analyzed as: 1) Group-averaged analysis: 20 beats were selected at different arterial pressure levels in each patient and then pooled together with data from all patients; 2) Individual analysis: PPG amplitude was correlated with PP and Cvasc beat-by-beat during ~ 5-10 minute recordings.
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Gerardo et al. (2021) studied this question.
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