Stopped: COVID pandemic changed completely the surgical schedule and human resources in our hospital. It was impossible to coordinate the anesthesiologists involved in the study with the kind of patients need for this particular study.
Changes in the vascular tone of anesthetized patients is common and cause hemodynamic problems. The investigators have previously demonstrated that the shape of the pulse oximetry waveform (photoplethysmography) is closely related to the changes observed in systemic vascular resistence. The main change in pulse waveform is based to the dichrotic notch position. The present study was designed to determine if the dichrotic notch position is related to a local or a systemic change in the vascular tone.
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Analysis in the position of the dichrotic notch between photoplethysmogram and spectral Doppler waveforms.
Timeframe: 4 hours