reversed shunt

shunt

[shunt] 1. to turn to one side; to divert; to bypass.2. a passage or anastomosis between two natural channels, especially between blood vessels. Such structures may be formed physiologically (e.g., to bypass a thrombosis), or they may be structural anomalies.3. a surgical anastomosis.arteriovenous shunt a U-shaped plastic tube inserted between an artery and a vein (usually between the radial artery and cephalic vein), bypassing the capillary network, a formerly common means of arteriovenous access.cardiovascular shunt an abnormality of the blood flow between the sides of the heart or between the systemic and pulmonary circulation; see shunt" >left-to-right shunt and shunt" >right-to-left shunt.jejunoileal shunt an intestinal bypass performed to control obesity.left-to-right shunt diversion of blood from the left side of the heart to the right side, or from the systemic to the pulmonary circulation through an anomalous opening such as a septal defect or patent ductus arteriosus.LeVeen shunt peritoneovenous shunt.mesocaval shunt a portosystemic shunt between the superior mesenteric vein and the inferior vena cava to reduce portal hypertension.peritoneovenous shunt a device whose purpose is to remove excess ascitic fluid from the peritoneal cavity and return it to the venous system; called also LeVeen shunt.

The shunt consists of a peritoneal tube, a one-way valve, and a tube leading to a large vein, usually the superior vena cava or the jugular vein. The perforated peritoneal tube is placed in the peritoneal cavity and attached to the one-way valve which opens at a pressure of 3 cm H₂O. The valve controls the direction of the flow of ascitic fluid and prevents a backflow of blood from the vein. A tube leading from the valve empties into the venous system.
The shunt is triggered into action by the patient's breathing. Upon inspiration, the diaphragm descends toward the abdominal cavity and causes a rise in fluid pressure in the thoracic superior vena cava. The difference in pressure, usually about 5 cm H₂O, opens the shunt valve, allowing the flow of ascitic fluid into the large vein. The action of the shunt can be enhanced by the patient's inspiring against pressure, as when using a blow bottle.
A disadvantage of the shunt is dilution of the blood and a resultant drop in hematocrit, which necessitates transfusion of packed cells and perhaps a slowing of the rate of flow of ascitic fluid into the venous system. Other inherent risks are infection, leakage of ascitic fluid from the operative site, elevated bilirubin, gastrointestinal bleeding, and disseminated intravascular coagulation.

Peritoneovenous (LeVeen) shunt for chronic ascites moves fluid from the peritoneal (abdominal) cavity into the superior vena cava. From Ignatavicius and Workman, 2000.portacaval shunt a portosystemic shunt between the portal vein and the vena cava.portosystemic shunt a surgically created shunt that connects the portal and systemic circulations, such as a mesocaval, portacaval, or splenorenal shunt.postcaval shunt portacaval shunt.pulmonary shunt an anomaly in which blood moves from the venous circulation to the arterial circulation without participating in gas exchange, resulting in hypoxemia.reversed shunt right-to-left shunt.right-to-left shunt diversion of blood from the right side of the heart to the left side or from the pulmonary to the systemic circulation through an anomalous opening such as septal defect or patent ductus arteriosus.splenorenal shunt an anastomosis of the splenic vein and the left renal vein, created to lower portal hypertension following splenectomy.ventriculoatrial shunt the surgical creation of a communication between a cerebral ventricle and a cardiac atrium by means of a plastic tube; done for relief of hydrocephalus.ventriculoperitoneal shunt a communication between a cerebral ventricle and the peritoneum by means of plastic tubing; done for the relief of hydrocephalus.ventriculovenous shunt a communication between a lateral ventricle and the venous system by means of a plastic tube; done for relief of hydrocephalus.

re·versed shunt

right-to-left shunt that had previously been a left-to-right shunt; rarely the opposite.

shunt

S08-858260 (shunt) [ME. shunten, to avoid] 1. To turn away from; to divert.2. An anomalous passage or one artificially constructed to divert flow from one main route to another.3. An electric conductor connecting two points in a circuit to form a parallel circuit through which a portion of the current may pass.

anatomical shunt

A normal or abnormal direct connection between arterial and venous circulation. An example of a normal anatomical shunt is the bronchial and thebesian vein connection.

arteriovenous shunt

An abnormal connection between an artery and the venous system.

Blalock-Taussig shunt

See: Blalock-Taussig shunt

cardiovascular shunt

An abnormal connection between the cavities of the heart or between the systemic and pulmonary vessels.

DIALYSIS SHUNT

dialysis shunt

An arteriovenous shunt created for use during renal dialysis. See: illustration

left-to-right shunt

The passage of blood from the left side of the heart to the right side through an abnormal opening (e.g., a septal defect).

physiological shunt

The route by which pulmonary blood perfuses unventilated alveoli. This process is caused by an imbalance between ventilation and perfusion.

pleuroperitoneal shunt

A conduit connecting the pleural space and the peritoneum, used to drain recurring pleural effusions, such as those that accumulate in patients with certain cancers in the chest. Synonym: Denver shunt

portacaval shunt

Surgical creation of a connection between the portal vein and the vena cava. Synonym: postcaval shunt

postcaval shunt

Portacaval shunt.

reversed shunt

Right-to-left shunt.

right-to-left shunt

The movement of blood or other body fluids backward through a shunt. The shunted blood has no opportunity to become oxygenated because of failure to pass through the lungs.

transjugular intrahepatic portosystemic shunt

Abbreviation: TIPS
A shunt that is inserted through the skin, jugular vein, and liver and then into the portal venous system to manage complications of portal hypertension, such as bleeding caused by esophageal varices or uncontrollable ascites. The shunt decreases pressure within the portal venous circulation (e.g., in patients with cirrhosis), bypassing the liver and allowing portal blood to flow directly into the vena cava. A common complication of the procedure is altered mental status, since blood that was previously detoxified by the liver is directed around it.

单词	reversed shunt
释义	DictionarySeeshunt reversed shunt shunt [shunt] 1. to turn to one side; to divert; to bypass.2. a passage or anastomosis between two natural channels, especially between blood vessels. Such structures may be formed physiologically (e.g., to bypass a thrombosis), or they may be structural anomalies.3. a surgical anastomosis.arteriovenous shunt a U-shaped plastic tube inserted between an artery and a vein (usually between the radial artery and cephalic vein), bypassing the capillary network, a formerly common means of arteriovenous access.cardiovascular shunt an abnormality of the blood flow between the sides of the heart or between the systemic and pulmonary circulation; see shunt" >left-to-right shunt and shunt" >right-to-left shunt.jejunoileal shunt an intestinal bypass performed to control obesity.left-to-right shunt diversion of blood from the left side of the heart to the right side, or from the systemic to the pulmonary circulation through an anomalous opening such as a septal defect or patent ductus arteriosus.LeVeen shunt peritoneovenous shunt.mesocaval shunt a portosystemic shunt between the superior mesenteric vein and the inferior vena cava to reduce portal hypertension.peritoneovenous shunt a device whose purpose is to remove excess ascitic fluid from the peritoneal cavity and return it to the venous system; called also LeVeen shunt. The shunt consists of a peritoneal tube, a one-way valve, and a tube leading to a large vein, usually the superior vena cava or the jugular vein. The perforated peritoneal tube is placed in the peritoneal cavity and attached to the one-way valve which opens at a pressure of 3 cm H₂O. The valve controls the direction of the flow of ascitic fluid and prevents a backflow of blood from the vein. A tube leading from the valve empties into the venous system. The shunt is triggered into action by the patient's breathing. Upon inspiration, the diaphragm descends toward the abdominal cavity and causes a rise in fluid pressure in the thoracic superior vena cava. The difference in pressure, usually about 5 cm H₂O, opens the shunt valve, allowing the flow of ascitic fluid into the large vein. The action of the shunt can be enhanced by the patient's inspiring against pressure, as when using a blow bottle. A disadvantage of the shunt is dilution of the blood and a resultant drop in hematocrit, which necessitates transfusion of packed cells and perhaps a slowing of the rate of flow of ascitic fluid into the venous system. Other inherent risks are infection, leakage of ascitic fluid from the operative site, elevated bilirubin, gastrointestinal bleeding, and disseminated intravascular coagulation.Peritoneovenous (LeVeen) shunt for chronic ascites moves fluid from the peritoneal (abdominal) cavity into the superior vena cava. From Ignatavicius and Workman, 2000.portacaval shunt a portosystemic shunt between the portal vein and the vena cava.portosystemic shunt a surgically created shunt that connects the portal and systemic circulations, such as a mesocaval, portacaval, or splenorenal shunt.postcaval shunt portacaval shunt.pulmonary shunt an anomaly in which blood moves from the venous circulation to the arterial circulation without participating in gas exchange, resulting in hypoxemia.reversed shunt right-to-left shunt.right-to-left shunt diversion of blood from the right side of the heart to the left side or from the pulmonary to the systemic circulation through an anomalous opening such as septal defect or patent ductus arteriosus.splenorenal shunt an anastomosis of the splenic vein and the left renal vein, created to lower portal hypertension following splenectomy.ventriculoatrial shunt the surgical creation of a communication between a cerebral ventricle and a cardiac atrium by means of a plastic tube; done for relief of hydrocephalus.ventriculoperitoneal shunt a communication between a cerebral ventricle and the peritoneum by means of plastic tubing; done for the relief of hydrocephalus.ventriculovenous shunt a communication between a lateral ventricle and the venous system by means of a plastic tube; done for relief of hydrocephalus. re·versed shunt right-to-left shunt that had previously been a left-to-right shunt; rarely the opposite. shunt S08-858260 (shunt) [ME. shunten, to avoid] 1. To turn away from; to divert.2. An anomalous passage or one artificially constructed to divert flow from one main route to another.3. An electric conductor connecting two points in a circuit to form a parallel circuit through which a portion of the current may pass. anatomical shunt A normal or abnormal direct connection between arterial and venous circulation. An example of a normal anatomical shunt is the bronchial and thebesian vein connection. arteriovenous shunt An abnormal connection between an artery and the venous system. Blalock-Taussig shunt See: Blalock-Taussig shunt cardiovascular shunt An abnormal connection between the cavities of the heart or between the systemic and pulmonary vessels.DIALYSIS SHUNT dialysis shunt An arteriovenous shunt created for use during renal dialysis. See: illustration left-to-right shunt The passage of blood from the left side of the heart to the right side through an abnormal opening (e.g., a septal defect). physiological shunt The route by which pulmonary blood perfuses unventilated alveoli. This process is caused by an imbalance between ventilation and perfusion. pleuroperitoneal shunt A conduit connecting the pleural space and the peritoneum, used to drain recurring pleural effusions, such as those that accumulate in patients with certain cancers in the chest. Synonym: Denver shunt portacaval shunt Surgical creation of a connection between the portal vein and the vena cava. Synonym: postcaval shunt postcaval shunt Portacaval shunt. reversed shunt Right-to-left shunt. right-to-left shunt The movement of blood or other body fluids backward through a shunt. The shunted blood has no opportunity to become oxygenated because of failure to pass through the lungs. transjugular intrahepatic portosystemic shunt Abbreviation: TIPS A shunt that is inserted through the skin, jugular vein, and liver and then into the portal venous system to manage complications of portal hypertension, such as bleeding caused by esophageal varices or uncontrollable ascites. The shunt decreases pressure within the portal venous circulation (e.g., in patients with cirrhosis), bypassing the liver and allowing portal blood to flow directly into the vena cava. A common complication of the procedure is altered mental status, since blood that was previously detoxified by the liver is directed around it.
随便看	master of rural development management master of sacred theology master of science master of science environmental engineering master of science for professional educators master of science health science master of science in accounting master of science in accounting and financial management master of science in accounting and taxation master of science in accounting forensics master of science in accounting information systems master of science in acupuncture and oriental medicine master of science in administration master of science in administrative studies master of science in adult education master of science in aerospace engineering master of science in anesthesia master of science in applied computer science master of science in applied economics master of science in applied engineering master of science in applied epidemiology master of science in applied physics master of science in applied technology master of science in athletic training master of science in aviation safety management