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1.
OBJECTIVES: One hundred consecutive patients with recurrent or refractory acute variceal hemorrhage treated with a transjugular intrahepatic portosystemic shunt (TIPS) from June 1990 to June 1993 at Oregon Health Sciences University or the Portland Veterans Affairs Medical Center were evaluated to assess shunt patency and clinical outcome, including complications of TIPS, rebleeding, and survival. METHODS: Success of shunt placement, reduction in portal pressure, complications, survival, recurrent hemorrhage, severity of ascites, hepatic encephalopathy before and after TIPS, and shunt patency were assessed in each patient. RESULTS: The mean follow-up period was 17.7 months (range, 0.1-56.7 months). TIPS was successfully completed in all patients, with a mean reduction in portosystemic gradient from 24 to 11 mm Hg. Major complications occurred in 11 patients, including one death. Survival after TIPS was 85% at 30 days, 71% at 1 yr, and 56% at 2 yr. Variceal bleeding stopped within 24 hours after TIPS in all eight patients with active hemorrhage. Recurrent variceal hemorrhage occurred in 18 patients at a mean of 4.3 months (range, 1-713 days) after TIPS. The cumulative rate of recurrent variceal bleeding was 20% at 1 yr and 25% at 2 yr after TIPS. Recurrent variceal bleeding was associated with shunt stenosis or occlusion in all patients with endoscopically documented variceal hemorrhage, which was successfully managed by reopening obstructed shunts and performing variceal embolization. The prevalence of ascites was significantly reduced among surviving patients evaluated 3 months after TIPS (67 vs 25%, p < 0.005). Three months after TIPS, the incidence of new or worsening hepatic encephalopathy was 20%, but encephalopathy improved in an equal proportion of patients. Seventy-three of 77 (95%) shunts examined for patency were open at the last follow-up examination. However, most shunts required intervention to maintain patency, and only 48% (37 of 77) were primarily patent at a mean of 168 days (range, 2-538 days) of follow-up. Shunt stenosis or occlusion, as determined by venography, became increasingly frequent with longer follow-up (52% at 3-9 months and 70% at 9-15 months). CONCLUSIONS: TIPS is effective in lowering elevated portal pressures in patients with refractory variceal hemorrhage, has acceptable postprocedure complication and mortality rates, ameliorates ascites, and in, a minority of patients, worsens encephalopathy. Shunt stenosis occurs in the majority of patients but can be effectively treated by interventional techniques to maintain patency. The incidence of recurrent variceal hemorrhage is low and is associated with shunt stenosis or occlusion.  相似文献   

2.
Nonsurgical reduction of portal hypertension by transjugular intrahepatic portosystemic shunt (TIPS) is widely used for prevention of variceal rebleeding (elective TIPS). Information is limited about the value of emergency TIPS for acute variceal bleeding unresponsive to endoscopic and drug therapy. The aim of the present study was therefore to determine whether the effects and complications differ between emergency and elective TIPS in patients with cirrhosis of the liver. TIPS was performed in 11 patients with acute variceal bleeding unresponsive to endoscopic treatment and 22 patients in stable condition after an episode of variceal bleeding. Clinical examination, blood sampling, Doppler sonography of TIPS flow, and upper gastrointestinal endoscopy were performed at days 1, 7, and 30 and at three-month intervals after TIPS. Mean follow-up was 549 (1-987) days. Bleeding was controlled by emergency TIPS in 10/11 patients. Probability of survival was not different after emergency and elective TIPS (0.73 vs 0.84 at one year). Early rebleeding (< or =2 weeks) occurred more often after emergency TIPS (3/11 vs 0/22 patients; P = 0.03), but there was no significant difference in late rebleeding. Occlusion of TIPS was more frequent after emergency TIPS. Occurrence of TIPS stenoses was identical in both groups (4/11 vs 8/22). De novo or deterioration of preexisting hepatic encephalopathy was similar (18% vs 24%; NS). It is concluded that TIPS is effective for control of acute variceal bleeding unresponsive to endoscopic and drug treatment. Early rebleeding and stent occlusion occurred more often after emergency TIPS. Late rebleeding, complications, and long-term survival did not differ from elective TIPS.  相似文献   

3.
We report the results of transjugular intrahepatic portosystemic shunt (TIPS) procedure in six patients with liver cirrhosis and recurrent bleeding or acute intractable bleeding from oesophageal varices in spite of multiple sessions of sclerotherapy. Median follow-up was 15 months (range 1-24 months). The procedure was technically successful in all patients without procedure-related morbidity or mortality. Four of the procedures were performed electively and two as an emergency procedure. The portosystemic pressure gradient decreased to below 12 mmHg following TIPS implantation and the shunt bloodflow was one quarter to three-quarters of the portal bloodflow determined by Doppler ultrasound. Recurrent bleeding occurred in one patient but was amenable to endoscopic sclerotherapy. In this patient the shunt had developed a stenosis that was treated by balloondilatation and insertion of an additional stent six months following the initial procedure, and no further bleeding occurred. The remaining five patients had no rebleeding episodes. Repeated Doppler examinations in the followup period demonstrated patency of all shunts. None of the patients developed portosystemic encephalopathy. One patient died of cerebral haemorrhage, unrelated to TIPS, 16 months following implantation. Another patient died 14 months following TIPS due to acute mesenteric occlusion and septicaemia. We conclude that TIPS is feasible and effective in selected patients with liver cirrhosis and persistent or recurrent variceal bleeding following repeated endoscopic therapy.  相似文献   

4.
Transjugular intrahepatic portosystemic shunt (TIPS) is a procedure recently introduced for the management of complications of portal hypertension. TIPS can be placed in the liver with relative ease by a skilled radiologist with a low risk of mortality. The major complications following the procedure are infection, especially in patients undergoing emergency TIPS, intra-abdominal haemorrhage from capsular punctures, and long-term problems related to encephalopathy and stenosis of the shunt. Encephalopathy is more of a problem in older patients with wide diameter shunts. Stenosis of the shunt is related to pseudo-intimal hyperplasia, probably related to transection of bile ductules during placement of the shunt. In view of the high rate of encephalopathy and stenosis following the shunt, a careful follow-up of all patients, including ultrasonographic and angiographic examination of the shunt, is mandatory. TIPS is used predominantly for the control of acute variceal haemorrhage, prevention of recurrent variceal bleeding, and refractory ascites when conventional treatment has failed. However, the role of TIPS in the management of complications of portal hypertension still awaits the outcome of clinical trials.  相似文献   

5.
The TIPS (transjugular intrahepatic portosystemic shunt) procedure is a relatively new therapeutic treatment option for variceal bleeding secondary to portal hypertension. The TIPS procedure evolved in response to the need for a safe, nonoperative shunting procedure, and is becoming a practical alternative to surgically placed shunts. Possible complications of a TIPS include hemorrhage, postprocedure sepsis, shunt encephalopathy or decompensation. Development of shunt stenosis or occlusion is associated with re-bleeding. Three children (ages 10-13) with recurrent, significant variceal bleeding were referred for the TIPS procedure. Two had recurrent GI hemorrhage despite sclerotherapy. To date, all have maintained shunt patency for up to 1 year. None of these children have had significant re-bleeding episodes, and the only recurrence of varices was associated with an obstructed shunt. In this article, the author reviews both conventional treatment and the TIPS procedure for the child with bleeding varices. Nursing implications from a pediatric perspective are emphasized. Pediatric GI nurses must understand TIPS in order to prepare the child and family and to monitor for complications or shunt failure afterward.  相似文献   

6.
One hundred patients underwent transjugular intrahepatic portosystemic shunt (TIPS) creation for variceal bleeding (n = 94), intractable ascites (n = 3), hepatorenal syndrome (n = 2), and preoperative portal decompression (n = 1). Shunts were completed in 96 patients. Portal vein pressure was reduced from 34.5 mm Hg +/- 7.6 (standard deviation) to 24.5 mm Hg +/- 6.2; the residual portal vein-hepatic vein gradient was 10.4 mm Hg +/- 0.9. Acute variceal bleeding was controlled in 29 of 30 patients. Of the 96 patients who underwent successful TIPS creation, 26 have died and 22 have undergone liver transplantation; the remaining 48 patients have survived an average of 7.6 months. Variceal bleeding recurred in 10 patients. Fifteen patients developed shunt stenosis (n = 6) or occlusion (n = 9). Patency was reestablished in eight of the nine occluded shunts. Seventeen patients developed new or worsened encephalopathy. The authors conclude that TIPS creation is an effective and reliable means of lowering portal pressure and controlling variceal bleeding, particularly in patients with acute variceal bleeding unresponsive to sclerotherapy and patients with chronic variceal bleeding before liver transplantation.  相似文献   

7.
Transjugular intrahepatic portosystemic shunts (TIPS) achieve portal decompression in a manner analogous to side-to-side surgical portacaval shunts but avoid the risks of general anesthesia and major surgery. These considerations have popularized this procedure for the treatment of refractory variceal hemorrhage. However, its increasing use has also led to the recognition of both expected as well as unexpected complications associated with TIPS. Also, the natural history of cirrhosis and portal hypertension after TIPS has now been well described. Such data allow optimizing management strategies for individual patients after TIPS placement. The use of TIPS for active variceal bleeding and the clinical factors influencing subsequent management are discussed in this article.  相似文献   

8.
Transjugular intrahepatic portosystemic shunt (TIPS) is a side-to-side portocaval shunt for threatening complications of portal hypertension. The purpose of this study was to evaluate in first 33 patients indicated for TIPS insertion in our institution the efficacy, complications, and mortality. Indication was failure of sclerotherapy or ligation in control either of acute (n = 4) or repetitive (n = 25) variceal bleeding and refractory ascites (n = 4). The technical success rate was with 70% (21/30) lower than expected, but the complication rate was also very low. There were no fatal complications, only one subcapsular liver hematome, and in one patient repetitive punction of biliary tract. The 30-days mortality was 10% (2/21) and rebleeding was 15% (3/20), caused always by thrombosis of the shunt. TIPS seems to be a promising therapeutic procedure after failed endoscopic therapy of esophageal varices without the mortality and morbidity of an open surgical procedure. Recent indications for TIPS are acute variceal hemorrhage refractory to endoscopic treatment and recurrent variceal bleeding despite sclerotherapy or band ligation. Promising seems to be TIPS insertion in the treatment of refractory ascites.  相似文献   

9.
BACKGROUND: There is no agreement on the management of patients with cirrhosis and recurrent variceal bleeding after failure of medical or endoscopic treatments or both. Portal systemic shunts are highly effective in preventing rebleeding but are associated with a high incidence of chronic encephalopathy. This study compared the results of a slightly modified Sugiura procedure (esophageal transection plus esophagogastric devascularization plus splenectomy) with those of nonselective portal systemic shunts in patients with previous variceal bleeding. METHODS: Fifty-four patients were included in this randomized controlled study between January 1984 and April 1989. The major end point was chronic encephalopathy. Secondary end points were recurrent variceal bleeding, survival, ascites, and hepatocellular carcinoma. RESULTS: Twenty-seven patients were assigned to each group. The rate of chronic encephalopathy was significantly (p = 0.002) lower after modified Sugiura procedure than after portal systemic shunt. Recurrent variceal bleeding was more frequent after modified Sugiura procedure than after portal systemic shunt, but the difference is not significant. One-, two-, and three-year survival rates were 93%, 81%, and 67%, respectively, in the modified Sugiura group and 78%, 66%, and 39%, respectively, in the portal systemic shunt group (p = 0.044). CONCLUSIONS: These results suggest that the modified Sugiura procedure is better overall than the nonselective portal systemic shunt in the management of patients with cirrhosis and recurrent variceal bleeding. Although the rebleeding rate is higher after the modified Sugiura procedure, this does not seem to affect mortality in these patients.  相似文献   

10.
Bleeding from anorectal varices can be massive and life threatening. Prompt differentiation between hemorrhoids and anorectal varices is crucial in treating these patients. Many different treatments are available for bleeding anorectal varices, but none has proved efficacy. We report a case of successful transjugular intrahepatic portosystemic shunt (TIPS) in controlling massive rectal variceal bleeding in an elderly patient with primary biliary cirrhosis and portal hypertension. After TIPS, rapid decompensation of liver function and encephalopathy developed and led to her death. Although TIPS may be effective in controlling acute life-threatening bleeding from anorectal varices, it can be associated with life-threatening complications.  相似文献   

11.
Transjugular intrahepatic portosystemic shunt (TIPS) is an exciting new method for treating complications of cirrhosis. Technical advances have allowed TIPS to be widely applied in the treatment of variceal bleeding. This article presents and discusses the results of recent experiences in TIPS placement. TIPS can be successfully placed in almost all patients. The complication rate of the procedure is low. TIPS is an effective means of controlling variceal bleeding and is especially useful for controlling bleeding in patients awaiting liver transplantation. It may also have a role in the treatment of ascites and other conditions related to portal hypertension. The most important issue facing TIPS is the long-term patency of the shunt. Potential solutions to the problem of long-term shunt patency are discussed.  相似文献   

12.
BACKGROUND & AIMS: Transjugular intrahepatic portosystemic shunt (TIPS) procedures are increasingly being used, but the relationship between the hemodynamic effects of TIPS and the clinical events on follow-up remains undefined. Hence, we have investigated the hemodynamic correlations of portal hypertension-related events after a TIPS procedure. METHODS: Prospective follow-up of 122 cirrhotic patients who had a TIPS procedure performed because of variceal hemorrhage was conducted. RESULTS: The portacaval pressure gradient (PPG) significantly decreased after the TIPS procedure (from 19.7 +/- 4.6 to 8.6 +/- 2.7 mm Hg; P > 0.001), but increased thereafter and at rebleeding (n = 25) was > 12 mm Hg in all patients (18.4 +/- 4.6 mm Hg). Twenty-six patients developed ascites; the PPG (measured in 19) was always > 12 mm Hg. Increasing the PPG to > 12 mm Hg occurred very frequently (83% at 1 year). Within 1 year, 77% of patients underwent balloon angioplasty or restenting. However, 80% had again a PPG of > 12 mm Hg 1 year after reintervention. Hepatic encephalopathy developed in 31% of patients at 1 year; 21 of 23 patients had a PPG of < 12 mm Hg. CONCLUSIONS: Total protection from the risk of recurrent complications of portal hypertension after a TIPS procedure requires that the PPG be decreased and maintained < 12 mm Hg. However, reintervention will be required in most patients within 1 year and again the second year. On the other hand, such portal decompression is associated with an increased risk of hepatic encephalopathy.  相似文献   

13.
OBJECTIVE: The objective of this study was to assess the impact of endoscopic therapy, liver transplantation, and transjugular intrahepatic portosystemic shunt (TIPS) on patient selection and outcome of surgical treatment for this complication of portal hypertension, as reflected in a single surgeon's 18-year experience with operations for variceal hemorrhage. SUMMARY BACKGROUND DATA: Definitive treatment of patients who bleed from portal hypertension has been progressively altered during the past 2 decades during which endoscopic therapy, liver transplantation, and TIPS have successively become available as alternative treatment options to operative portosystemic shunts and devascularization procedures. METHODS: Two hundred sixty-three consecutive patients who were surgically treated for portal hypertensive bleeding between 1978 and 1996 were reviewed retrospectively. Four Eras separated by the dates when endoscopic therapy (January 1981), liver transplantation (July 1985), and TIPS (January 1993) became available in our institution were analyzed. Throughout all four Eras, a selective operative approach, using the distal splenorenal shunt (DSRS), nonselective shunts, and esophagogastric devascularization, was taken. The most common indications for nonselective shunts and esophagogastric devascularization were medically intractable ascites and splanchnic venous thrombosis, respectively. Most other patients received a DSRS. RESULTS: The risk status (Child's class) of patients undergoing surgery progressively improved (p = 0.001) throughout the 4 Eras, whereas the need for emergency surgery declined (p = 0.002). The percentage of nonselective shunts performed decreased because better options to manage acute bleeding episodes (sclerotherapy, TIPS) and advanced liver disease complicated by ascites (liver transplantation, TIPS) became available (p = 0.009). In all Eras, the operative mortality rate was directly related to Child's class (A, 2.7%; B, 7.5%; and C, 26.1 %) (p = 0.001). As more good-risk patients underwent operations for variceal bleeding, the incidence of postoperative encephalopathy decreased (p = 0.015), and long-term survival improved (p = 0.012), especially since liver transplantation became available to salvage patients who developed hepatic failure after a prior surgical procedure. There were no differences between Eras with respect to rebleeding or shunt occlusion. Distal splenorenal shunts (p = 0.004) and nonselective shunts (p = 0.001) were more protective against rebleeding than was esophagogastric devascularization. CONCLUSIONS: The sequential introduction of endoscopic therapy, liver transplantation, and TIPS has resulted in better selection and improved results with respect to quality and length of survival for patients treated surgically for variceal bleeding. Despite these innovations, portosystemic shunts and esophagogastric devascularization remain important and effective options for selected patients with bleeding secondary to portal hypertension.  相似文献   

14.
Thrombocytopenia is frequently present in patients with cirrhosis. The effect of portal decompression on thrombocytopenia using a variety of shunt procedures has been contradictory. Transjugular intrahepatic portosystemic shunt (TIPS) has been proposed as a less invasive procedure for portal decompression, mainly for control of variceal bleeding or intractable ascites. Its effect on thrombocytopenia has not been defined yet. The aim of this review is to define the effect of TIPS on patients with cirrhosis and thrombocytopenia. Sixty-two patients who underwent TIPS at the University of Pittsburgh and survived without transplant for more than two months were included. Platelet count was determined prior to TIPS as well as at one-week, one-month, and three-month intervals after TIPS. The prevalence of thrombocytopenia prior to TIPS was 49%. TIPS had no effect on thrombocytopenia even when the portosystemic gradient was reduced to less than 12 mm Hg. In conclusion, portal decompression after TIPS did not affect the degree of thrombocytopenia.  相似文献   

15.
Creation of a transjugular intrahepatic portasystemic stent shunt (TIPSS) was used as a rescue treatment for patients with variceal bleeding refractory to standard medical and endoscopic treatment. Over a 2-year period 242 episodes of variceal bleeding were treated and emergency shunting was performed on 20 patients with uncontrolled bleeding (Pugh grade A, one; B, seven; C, 12). The procedure was technically successful and controlled bleeding in all patients. Six patients had early rebleeding within 5 days, and further shunting was required in two. Two had late rebleeding related to shunt occlusion and had a further TIPSS procedure followed by portacaval shunting. Twelve patients died within 40 days from liver failure and sepsis, and there were two late deaths after 2 and 6 months, unrelated to bleeding. TIPSS insertion is an effective therapeutic option in patients with acute variceal bleeding refractory to medical and endoscopic treatment. However, despite control of bleeding in this group, the hospital mortality rate was high, reflecting the severity of the underlying liver disease.  相似文献   

16.
Current strategies for management of acute esophageal variceal bleeding and for long-term treatment after an episode of variceal bleeding are outlined. Acute variceal bleeding is best managed by means of endoscopic therapy (sclerotherapy, band ligation, or "superglue"), whereas the role of pharmacologic agents remains controversial. In cases of failure of endoscopic therapy, a transjugular intrahepatic portosystemic shunt (TIPS) procedure, an emergency shunt, or a transection operation should be performed. Patients who experience an acute variceal bleeding episode require long-term management to prevent recurrent bleeding. Endoscopic treatment is preferred using either sclerotherapy or banding. The principal alternative is long-term pharmacologic therapy with beta-adrenergic receptor blocking agents. Major surgical procedures should be reserved for failures of endoscopic or pharmacologic therapy. The distal splenorenal shunt or the new narrow-diameter polytetrafluoroethylene portacaval shunt is preferred. All patients who are first seen with acute variceal bleeding should be considered for a liver transplant, although few will ultimately become transplant candidates. Patients with end-stage liver disease who are not transplant candidates should be identified and major high-cost therapy discontinued. Prophylactic therapy prior to variceal bleeding should be considered in selected patients. At present, only pharmacologic therapy is justified. The major problem remains identification of those patients at high risk for a first episode of variceal bleeding.  相似文献   

17.
Ascites becomes refractory to medical treatment in nearly 10% of cirrhotic patients, who then require repeated large-volume paracentesis. In this prospective study we evaluated the use of transjugular intrahepatic portosystemic shunt (TIPS) in 30 patients with refractory ascites. TIPS was successful in all and resulted in a 54% reduction in portacaval gradient (from 22.8 +/- 0.8 to 10.4 +/- 0.6 mm Hg). Ascites became easily controlled with diuretics in 26 patients following TIPS. Ascites recurrence associated with shunt stenosis was observed during follow-up in eight patients; revision could be undertaken in five of them and resulted in good control of ascites. In responders, a marked decrease in plasma aldosterone and renin activity, a reduction in serum creatinine, and a rise in urinary sodium excretion were observed. Creatinine and inulin clearances improved significantly; PAH clearance remained unchanged. However, new-onset or worsening hepatic encephalopathy was seen in 14 patients. Severe disabling chronic encephalopathy occurred in five patients; it could be reversed successfully by balloon occlusion of the shunt in three. The cumulative survival rate was 41 and 34% at 1 and 2 years, respectively. In summary, TIPS can control refractory ascites in a majority of patients but is associated with a high rate of chronic disabling HE. In addition, the survival rate is poor. Randomized trials are needed to evaluate the exact role of TIPS in the management of refractory ascites. It is unlikely to improve survival but can ameliorate quality of life in nontransplant candidates and be useful as a bridge to transplantation, in particular, to improve denutrition associated with longstanding tense ascites.  相似文献   

18.
BACKGROUND: The increase in portal vascular resistance is a significant complication of metastatic disease to the liver or locally advanced cancer, e.g., biliary cancer. PATIENTS AND METHODS: This paper describes the successful palliative treatment of two cancer patients with portal hypertension presenting with the symptoms of tense ascites, mesenteric congestion, and severe variceal bleeding. By creating a stenttract between a hepatic vein and a main branch of the portal vein and/or by placing an extendable stent into the portal vein, the transjugular intrahepatic portosystemic stent-shunt (TIPS) technique was used to decompress the portovascular system. RESULTS: The TIPS-technique offers a new, safe and effective palliation for malignant portal hypertension. In both patients, the symptoms of the portal hypertension disappeared after the procedure. This was accompanied by a significant improvement of the patients performance status allowing an early ambulation. CONCLUSION: Our findings demonstrate the feasibility and effectiveness of the TIPS procedure as a minimal invasive treatment for portal vein decompression in selected tumor patients.  相似文献   

19.
Twenty-five patients with liver cirrhosis and portal hypertension were admitted for creation of a transjugular intrahepatic portosystemic shunt (TIPS). The procedure was successful in 22 patients (technical success 88%). The mean portal pressure gradient was lowered from 24.5 mmHg before to 11.4 mmHg after TIPS. Two early and three late occlusions were observed (primary patency rate 78%). The rate of secondary interventions was 41%. Five times a hepatic vein stenosis was dilated and stented, two times an occluded shunt was recanalized, two times a new shunt was created parallel to an occluded (secondary patency rate within a maximum of 16 months 95%). In two patients sepsis occurred which was effectively treated with antibiotics, two patients died shortly after TIPS due to hepatorenal syndrome and hepatic failure, respectively. There was no recurrent bleeding. Two patients developed hepatic encephalopathy; both improved after protein restriction. The authors conclude that TIPS is an alternative procedure to shunt surgery, especially for patients who cannot benefit from sclerotherapy.  相似文献   

20.
Hepatic hydrothorax is a rare complication of portal hypertension. Conservative therapy may be successful but refractory hepatic hydrothorax is not uncommon. Management of refractory hydrothorax is usually ineffective and can result in a worsened clinical status. Transjugular intrahepatic portosystemic shunts (TIPS) lower portal pressure and have been used in the treatment of refractory ascites. The aim of this study was to determine the efficacy of TIPS in the treatment of symptomatic refractory hepatic hydrothorax. A TIPS was placed in 24 consecutive cirrhotic patients with symptomatic refractory hepatic hydrothorax. Five patients (20.8%) were Child's/Pugh class B and 19 (79.2%) were class C. All had undergone multiple thoracenteses and were hypoalbuminemic. Mean follow-up was 7.2 months (range, 0.25-49 months). Fourteen (58.3%) of 24 patients had complete relief of symptoms after shunt placement and did not require further thoracentesis. Five (20.8%) additional patients required fewer thoracenteses. Five (20.8%) patients developed worsening liver function and died within 45 days. In eight (66.7%) of 12 patients with > or = 60 days of follow-up, the serum albumin increased by a mean of 1.2 g/dL (range, 0.1-2.2 g/dL). The Child's-Pugh score improved in 7 (58.3%) of these 12 patients and two patients improved from class C to class A. These two patients no longer require liver transplantation. This study shows that TIPS can be effective in the management of symptomatic, refractory hepatic hydrothorax. Clinical and laboratory improvement may be seen and liver transplantation may become unnecessary.  相似文献   

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