Portasystemic shunt is a medical term used to refer to a condition where blood flow is redirected from the portal vein to the systemic circulation. The word is pronounced as /ˈpɔrtəʊsɪsˈtɛmɪk ʃʌnt/ in IPA phonetic transcription. The first two syllables 'porta' are pronounced with an open 'o' sound as in 'Paul', while the following 'sys' syllable is pronounced with a short 'i' sound as in 'sit'. The stress in the word is on the second syllable 'sys', leaving the last syllable 'shunt' with an unstressed 'u' sound as in 'but'.
A portasystemic shunt, also known as a portacaval shunt, is a medical procedure or condition involving the redirecting or bypassing of blood flow between the portal vein and the systemic circulation. The portal vein is responsible for carrying nutrient-rich blood from the digestive system to the liver, where it undergoes filtration and processing.
In certain medical conditions such as portal hypertension or liver cirrhosis, the portal vein becomes obstructed, causing increased pressure within the liver. This increased pressure can lead to the formation of abnormal blood vessels called varices, which can be prone to bleeding.
To alleviate this condition, a portasystemic shunt may be surgically created, allowing blood to bypass the blocked portal vein. The shunt is typically created by connecting the portal vein to a large vein, such as the inferior vena cava, which returns blood to the heart. This redirects the blood flow away from the liver, reducing the pressure and reducing the risk of variceal bleeding.
There are different types of portasystemic shunts depending on the location where the connection is made, such as distal splenorenal shunt and transjugular intrahepatic portosystemic shunt (TIPS). The choice of shunt depends on various factors including the severity of the condition and the patient's suitability for each procedure.
Portasystemic shunts can effectively alleviate symptoms associated with portal hypertension, but they may also have potential complications such as encephalopathy, infection, or shunt thrombosis. Close monitoring and follow-up care are essential to manage any potential risks.
The term "portasystemic shunt" is composed of two parts: "porta-" and "systemic shunt".
1. "Porta-" refers to the porto- (or portal-) vein, which is a blood vessel that carries blood from the digestive organs to the liver. The word "porta" originates from the Latin word "porta", meaning "gate" or "entrance". In this context, it is specifically used to denote the portal vein.
2. "Systemic shunt" refers to the redirection of blood from one part of the circulatory system to another. The term "shunt" comes from the Old English word "sceont", meaning "a deviation or turning aside".