مقايسه حالت اسيد و باز در خون شرياني و وريدي بيهوشي

The comparison of acid and base status of arterial and venous blood of hand during anesthesia

Background: From the beginning of anesthesiology, there has been a need for monitoring especially monitoring of oxygenation, acid and base status. So, different devices have been made which one of the most useful methods is monitoring of arterial blood gas which is an invasive way and is not useful for all patients. According to its complications and being invasive, this method is limited to specific patients. So, we compared the acid and base status in arterial blood with veins of hand which is an easier method and has less complications. Materials and methods: 20 patients with ASA Class I and II were enrolled in this prospective study. 15 minutes after induction of anesthesia, we first took blood sample of radial artery and immediately after it, of hand vein and were sent to blood gas labs. Results: In this study, oxygen pressure (PO:), C02 pressure (PC02), oxygen saturation (SP02) and pH had significant difference in arterial and venous blood (p<0.01). Mean base exceeds (BE) and bicarbonate (HCO3) didnʹt have significant difference in arterial and venous blood (P>0.05) Conclusion: According to significant difference in P02, SP02 and pH of arterial and venous blood, venous blood canʹt be used as a reliable replacement for arterial blood to evaluate the oxygenation and acid- base status.