Central Venous oxygen Saturation(ScvO2)Monitoring in Hemorrhagic Shock

ABSTRACT

An accurate and relatively simple method for estimating the amount of acute blood loss is essential in the hemorrhagic shock patients. Conventional physiologic parameters, blood pressure, pulse rate and CVP, could not serve for evaluation of the adequate oxygen transport in the tissue. Pulmonary artery catheter is a best tool for evaluating the cardiopulmonary function and the oxygen transport system, and mixed venous oxygen saturation(SvO2) monitoring have made a great advances for early detection of cardiovascular dysfunction and the changes in peripheral tissue oxygenation. But pulmonary artery catheterization is complicated procedure in emergency setting. Although the central venous oxygen saturation(ScvO2) cannot completely replace the SvO2 value, it has a close relation with SvO2 change in variable clinical situations. We testify the usefulness of ScvO2 monitoring in 24 patients of the hemorrhagic shock. Initial resuscitation was performed with ATLS standard and continuous ScvO2 was monitored. Systolic blood pressure and pulse rate were recorded for one hour from initial resuscitation in each 15 minutes. Nineteen patient was traumatic hemorrhagic shock and five was non traumatic. Twelve of 19 patients was blunt trauma, and remains were stab in injury mechanism. Mortality rate was 29.2%. Initial ScvO2 of nonsurvivor was 43.6%, and 51.3% in survivor groups(p>0.05). In the group of stab wound and non-traumatic hemorrhage, the ScvO2 was gradually increase by time. But ScvO2 in survivors of blunt trauma was increased first 30 minutes and decrease afterthen. Continuous monitoring of ScvO2 may by partly useful in resuscitation for hemorrhagic shock. It is more valuable in the blunt trauma than in the penetrating injury or non-traumatic hemorrhage.