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Hepatic venous outflow obstruction
1Department of Gastrointestinal Surgery and Liver Transplantation, All India Institute of Medical Sciences, New Delhi, India. gkpande@medinst.ernet.in
Insights
Budd-Chiari syndrome, a cause of portal hypertension, involves hepatic vein or IVC obstruction. Management includes anticoagulants, shunts, angioplasty, or transplantation, with potential for hepatocellular carcinoma development.
Area of Science:
- Gastroenterology and Hepatology
- Vascular Medicine
- Hematology
Background:
- Hepatic venous outflow obstruction, or Budd-Chiari syndrome, is an increasingly recognized cause of portal hypertension.
- Obstruction patterns vary geographically, affecting hepatic veins in Western countries and the inferior vena cava (IVC) in South Africa, Japan, and India.
- Etiologies include hypercoagulable states, but a cause remains unidentified in 25-75% of cases.
Purpose of the Study:
- To provide a comprehensive overview of Budd-Chiari syndrome, encompassing its causes, clinical presentation, diagnostic modalities, and therapeutic strategies.
- To highlight the importance of early diagnosis and appropriate management for improving patient outcomes.
- To discuss the long-term complications, including hepatocellular carcinoma, and the role of anticoagulation.
Main Methods:
- Review of existing literature on Budd-Chiari syndrome.
- Analysis of diagnostic approaches, including ultrasound, liver biopsy, and imaging studies like inferior vena cavography.
- Evaluation of treatment options, ranging from thrombolytic therapy and surgical shunts to balloon angioplasty and liver transplantation.
Main Results:
- Hepatic vein obstruction typically presents with hepatomegaly and ascites, while IVC obstruction is associated with prominent superficial veins.
- Ultrasound is the initial diagnostic step, with liver biopsy considered the gold standard.
- Treatment strategies depend on the phase and severity, with anticoagulation crucial for preventing rethrombosis.
Conclusions:
- Budd-Chiari syndrome requires a multi-faceted approach involving accurate diagnosis and tailored treatment.
- Long-term anticoagulation is essential post-intervention to prevent recurrence.
- Hepatocellular carcinoma is a significant long-term risk, necessitating vigilant follow-up.
Abstract:
Hepatic venous outflow obstruction also called the Budd-Chiari syndrome is increasingly being recognized as a cause of portal hypertension. In western countries the obstruction is usually in the hepatic veins while in reports from South Africa, Japan and India the predominant cause is a block in the IVC at the level of the diaphragm above the entry of the hepatic veins. A hypercoagulable state caused by myeloproliferative haematological disorders, clonal defects in haemopoietic stem cells, lupus anticoagulant, contraceptive pills and postpartum state are some of the aetiological conditions described. However in 25% to 75% cases no cause can be identified. The predominant presenting features in patients with hepatic vein obstruction are hepatomegaly and ascites while those with IVC obstruction show prominent veins on the trunk and back. Ultrasound examination should be the first investigative step. However a liver biopsy is the gold standard of diagnosis. To confirm the site of obstruction inferior vena cavography or functional hepatography may be required. In the acute phase thrombolytic therapy may be useful but for established cases either surgical intervention in the form of shunts or recently balloon angioplasty may be helpful. For patients with established cirrhosis and end-stage liver failure the only alternative is liver transplantation. All these patients however should be put on long term anticoagulants to prevent rethrombosis. Some series have reported that upto 45% of patients may develop hepatocellular carcinoma on long term followup. With proper management a larger proportion of patients can be returned to a useful productive life.