Book contents
- Liver Disease in Children
- Liver Disease in Children
- Copyright page
- Contents
- Contributors
- Preface
- Section I Pathophysiology of Pediatric Liver Disease
- Chapter 1 Liver Development
- Chapter 2 Functional Development of the Liver
- Chapter 3 Mechanisms of Bile Formation and the Pathogenesis of Cholestasis
- Chapter 4 Acute Liver Failure in Children
- Chapter 5 Cirrhosis and Chronic Liver Failure in Children
- Chapter 6 Portal Hypertension in Children
- Chapter 7 Laboratory Assessment of Liver Function and Injury in Children
- Section II Cholestatic Liver Disease
- Section III Hepatitis and Immune Disorders
- Section IV Metabolic Liver Disease
- Section V Other Considerations and Issues in Pediatric Hepatology
- Index
- References
Chapter 6 - Portal Hypertension in Children
from Section I - Pathophysiology of Pediatric Liver Disease
Published online by Cambridge University Press: 19 January 2021
- Liver Disease in Children
- Liver Disease in Children
- Copyright page
- Contents
- Contributors
- Preface
- Section I Pathophysiology of Pediatric Liver Disease
- Chapter 1 Liver Development
- Chapter 2 Functional Development of the Liver
- Chapter 3 Mechanisms of Bile Formation and the Pathogenesis of Cholestasis
- Chapter 4 Acute Liver Failure in Children
- Chapter 5 Cirrhosis and Chronic Liver Failure in Children
- Chapter 6 Portal Hypertension in Children
- Chapter 7 Laboratory Assessment of Liver Function and Injury in Children
- Section II Cholestatic Liver Disease
- Section III Hepatitis and Immune Disorders
- Section IV Metabolic Liver Disease
- Section V Other Considerations and Issues in Pediatric Hepatology
- Index
- References
Summary
A portal system is one, which by definition, begins and ends with capillaries. The major portal system in humans is one in which the capillaries originate in the mesentery of the intestines and spleen and end in the hepatic sinusoids. Capillaries of the superior mesenteric and splenic veins supply the portal vein with a nutrient- and hormone-rich blood supply. The partially oxygenated portal venous blood supplements the oxygenated hepatic arterial flow to give the liver unique protection against hypoxia. Blood flow from the hepatic artery and portal vein is well coordinated to maintain consistent flow and explains the ability of the liver to withstand thrombosis of either of these major vascular structures. This well-regulated blood flow in conjunction with the very low resistance found in the portal system results in a low baseline portal pressure in healthy individuals.
- Type
- Chapter
- Information
- Liver Disease in Children , pp. 74 - 93Publisher: Cambridge University PressPrint publication year: 2021