J Clin Monit Comput - The analysis of transesophageal oxygen saturation photoplethysmography from different signal sources.

Tópicos

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Resumo

The photoplethysmography (PPG) signals detected by transesophageal oximetry sensor toward aorta arch (AA), descending aorta (DA), and left ventricle (LV) under the guidance of transesophageal echocardiography (TEE) were investigated, and the effects of filter application on PPG signals were evaluated. Eleven cardiac surgical patients were involved. After anesthesia was induced, the TEE probe with a modified pulse oximetry sensor was inserted. Under the guidance of TEE, the AA PPG, DA PPG and LV PPG were detected respectively when ventilator was on and off. The mean alternating current (AC) amplitudes and direct current (DC) values of original and filtered PPG signals were measured. The ratio of AC and DC value (AC/DC) and ventilation-induced AC variations were calculated. Satisfactory PPG waveforms were obtained in all patients under the guidance of TEE. The AC amplitude in LV PPG was significant larger than in AA and DA PPG, and both AC/DC and ventilation-induced AC variation in LV PPG were significantly higher than in AA PPG or DA PPG either. There were no significant differences of AC amplitude between filtered and ventilation off PPG signals. The AC amplitudes and AC/DC toward LV are significantly higher than transesophageal oximeter toward AA or DA, and the effect of mechanical ventilation on transesophageal PPG can be obviously reduced by filtering techniques.

Resumo Limpo

photoplethysmographi ppg signal detect transesophag oximetri sensor toward aorta arch aa descend aorta da left ventricl lv guidanc transesophag echocardiographi tee investig effect filter applic ppg signal evalu eleven cardiac surgic patient involv anesthesia induc tee probe modifi puls oximetri sensor insert guidanc tee aa ppg da ppg lv ppg detect respect ventil mean altern current ac amplitud direct current dc valu origin filter ppg signal measur ratio ac dc valu acdc ventilationinduc ac variat calcul satisfactori ppg waveform obtain patient guidanc tee ac amplitud lv ppg signific larger aa da ppg acdc ventilationinduc ac variat lv ppg signific higher aa ppg da ppg either signific differ ac amplitud filter ventil ppg signal ac amplitud acdc toward lv signific higher transesophag oximet toward aa da effect mechan ventil transesophag ppg can obvious reduc filter techniqu

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