الفهرس 
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Abstract
Aim of the work
To study the changes in the oxygen saturation in the portal vein, splenic vein and systemic artery to determine differences in oxygen saturation of the portal blood and the degree of the splenic venous blood to these differences.
Conclusion
With the increase in pressure in the portal circulation the grade of varices increases and the oxygen saturation drops which means that portal circulation becomes more and more stagnant. Accordingly, diversion of the splenic venous blood from a high pressure drainage system, portal circulation, to a low pressure drainage system, systemic venous circulation, will improve the stasis in the circulation of the gastrosplenic compartment of the portal system.
This study reveals no correlation between portal vein diameter or splenic vein diameter and any other factor that indicates the severity of the disease e.g. number of bleeding attacks, child’s class, grade of varices and portal vein pressure.
This study reveals that there is a highly significant correlation between the number of bleeding attacks and both child’s class and Pugh score, so any one of the three can be taken as an indicator of the severity of the disease with equal results.