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  • Title: [The pulmonary arterial oxygen saturation monitoring via trachea in hypoxia dogs].
    Author: Gong Q, Wang L, Wei W, Yang Z, Mou L, Liu Q.
    Journal: Sheng Wu Yi Xue Gong Cheng Xue Za Zhi; 2009 Aug; 26(4):752-6. PubMed ID: 19813603.
    Abstract:
    This study was aimed to assess the agreement between pulse pulmonary arterial oxygen saturation (StO2) by oximetry in trachea and the mixed venous oxygen saturation (SvO2) by fiberoptic pulmonary arterial catheter, and to evaluate the accuracy of StO2 monitoring during hypoxia. 10 mongred dog's were used. After anesthesia was induced and thorax was opened, we placed a fiberoptic pulmonary artery catheter directly through the dog's right ventricular outlet. Then, we placed and adjusted the trachea catheter, attached the oximetry probe to trachea carina till the high quality StO2 PPG signal was obtained, and till the readings were stable at about +/-2% from fiberoptic catheter. The pair readings of StO2 and SvO2 were recorded at every minute interval in 10 minutes when circulation was stable. Decreasing the inhaled oxygen concentration till the tongue's SpO2 decreased to 60%; recording the changes of StO2 and SvO2 in every 5% drop of tongue's SpO2 when the tongue's SpO2 decreased from 100% to 50%. The results showed that there was a good agreement between the two methods for pulmonary arterial oxygen saturation measurement. However, the difference between the two methods was great and unacceptable during the presence of hypoxia.
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