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REVIEW article

Front. Med., 26 April 2023
Sec. Pulmonary Medicine
This article is part of the Research Topic Pulmonary Embolism—New Diagnostic and Therapeutic Strategies View all 6 articles

Portal vein thrombosis in cirrhosis: A literature review

Swathi PrakashSwathi Prakash1Jared BiesJared Bies1Mariam HassanMariam Hassan1Adriana MaresAdriana Mares2S. Claudia Didia
S. Claudia Didia1*
  • 1Department of Internal Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, TX, United States
  • 2Paul L. Foster School of Medicine, El Paso, TX, United States

Portal Vein Thrombosis (PVT), a common complication of advanced liver disease, is defined as an obstruction of the portal vein due to thrombus formation that can extend to the superior mesenteric and splenic veins. It was believed that PVT occurred predominantly due to prothrombotic potential. However, recent studies have shown that decreased blood flow related to portal hypertension appears to increase PVT risk as per Virchow’s triad. It is well known that there is a higher incidence of PVTs in cirrhosis with a higher MELD and Child Pugh score. The controversy for management of PVTs in cirrhotics lies in the individualized assessment of risks versus benefits of anticoagulation, since these patients have a complex hemostatic profile with both bleeding and procoagulant propensities. In this review, we will systematically compile the etiology, pathophysiology, clinical features, and management of portal vein thrombosis in cirrhosis.

Introduction

In a study conducted between 1970 and 1982 on 23,796 autopsies revealed a portal vein thrombosis (PVT) prevalence of 1% wherein 28% of the subjects had cirrhosis, 23% of the subjects had primary hepatobiliary malignancy and 44% of the subjects had secondary hepatobiliary malignancy (1). The incidence of PVT in cirrhosis is unclear but, ranges from 4.4% to 15.8% (2). In a prospective study of 369 cirrhotic patients, the incidence of PVT was 1.6% at 1 year, 6% at 3 years and 8.3% at 5 years (3).

Portal Vein Thrombosis (PVT) is defined as a partial or complete obstruction of the portal vein due to thrombus formation (4). Although, there are several causes for PVT development whether it may local or systemic, they usually occur in concurrence to one another. A meta-analysis which included 2,436 cirrhotic patients suggests that PVT may increase mortality and ascites (5). In this review, we will discuss the etiopathogenesis, clinical features, diagnosis, management, and prevention of portal vein thrombosis in cirrhosis.

Etiopathogenesis

The etiopathogenesis of portal vein thrombosis (PVT) in cirrhosis is dynamic. Increased PVT risk is associated with decreased blood flow in relation to portal hypertension as per Virchow’s triad. The liver has a major role in the hemostatic system as it synthesizes most of the coagulation factors and proteins involved in fibrinolysis. It also synthesizes thrombopoietin which is responsible for platelet production. Consequently, acute and chronic liver disease have a profound impact on the hemostatic system. All three major components of the hemostatic process are disturbed in patients with cirrhosis. The derangements occur both on the procoagulant and the anticoagulation processes, leaving cirrhotic patients in a state of rebalanced hemostasis that can be altered in either direction in response to insults.

The extent of certain parameters correlating with PVT in cirrhosis has been shown in literature. Previously, PVT formation has been postulated as a consequence to a hypercoagulable and hyperinflammatory state due to the decrease of anticoagulants such as protein C and protein S with higher concentrations of certain factors such as Von Willebrand Factor (vWF) and factor VIII. Indeed, these risk factors are significant for systemic DVT formation. However, these same factors do not contribute to the formation of PVT. It was believed previously that the portal vein propagated PVT formation through the composition of an excessively inflammatory/hypercoagulable vascular bed. This belief was challenged in a prospective cohort study that showed that hypercoagulability and increased levels of inflammatory markers in the systemic circulation were not predictive of PVT development (6).

One risk factor for systemic DVT formation in the general public is non-O blood types. This is secondary to a hypercoagulable state due to increased von Willebrand Factor (VWF)/factor VIII levels in these individuals. This association is not present in non-O blood type patients with cirrhosis who develop PVT. A retrospective analysis of two large cohorts of cirrhosis patients with PVT found that non-O blood types was not a significant risk factor for PVT formation (7). In the first large cohort prospective study to address the risk factors for non-tumoral PVT development in cirrhotic patients, it was found that the severity of portal hypertension, history of variceal bleeding, low platelet count, and low portal blood flow velocity were the only significant factors contributing to PVT formation (8). It found that acquired or genetic hypercoagulable states were not significant risk factors. The dissociation of genetic hypercoagulability predisposing as a risk factor for PVT formation was further confirmed in a longitudinal prospective study (9).

The hemodynamic changes that occur in portal vein blood flow contribute in the formation of PVT in cirrhotic patients. As the severity of cirrhosis progresses, the intrahepatic vascular resistance increases proportionally and results in the clinical appearance of portal hypertension Consequentially, the increase in portal pressures leads to a compensatory splanchnic arteriolar vasodilation and the formation of porto-collateral vessels. The dilatory effect of the portal vein with shunting of blood away via the newly formed porto-collateral vessels leads to a substantial reduction of portal blood flow and portal flow velocity. The role of decreased portal flow velocity in the formation of PVT was demonstrated in a published prospective study of 100 cirrhotic patients in 2009 (10). This study found a flow velocity below 15 cm/s as a significant risk factor for the formation of PVT in cirrhotic patients. This parameter has been confirmed as a risk factor in other retrospective and prospective studies, therefore, establishing decreased portal flow velocity as a significant risk factor in the development of PVT in cirrhosis (3, 11, 12).

The role of endothelial intravascular vessel wall damage in hemostasis is well understood outside of the splanchnic territory. Although the territory is venous, the pathogenesis of thrombosis differs from that of systemic venous thrombosis. Most of information concerning the pathogenesis of venous thrombosis is systemic. This is largely because the splanchnic venous territory is vastly inaccessible (13, 14). During periods of stress, the endothelial cells can become damaged and express a pro-coagulant phenotype which propagates the initial formation of thrombus (15). The endothelial pro-coagulant phenotype has shown an upregulation of certain markers as the advancement of cirrhosis leads to a significant risk factor for PVT formation. Many studies have shown the upregulation of P-selectin (16, 17) and vWF (18, 19) in dysfunctional endothelium of the portal vein signifying a contributing factor for PVT. A study with 20 cirrhotic patients found elevated vWF in the portal venous circulation in comparison to the peripheral venous circulation, as well as increased levels of endothelial secreted Factor VIII (20). The significance of portal vein endothelial damage and upregulation of procoagulant factors is further supported by circulating factors such as sulphated glycosaminoglycans (GAGs), MP, annexin V+, CD62+, thrombomodulin and t-PAIC (21, 22). Although, the endothelial vessel wall damage plays a role in the formation of PVT, the exact mechanism is not completely elucidated and requires further research (10). The damage of the endothelial vessel wall from increased severity of portal hypertension also increases intimal hyperplasia. The association between formation of PVT secondary to upregulation of procoagulant factors, intimal hyperplasia, and increased severity of portal hypertension is not well understood. In sight of recent studies showing hypercoagulable states not significantly correlating with development of PVT in cirrhosis confirms that PVT and DVT/PE are two distinct disease processes with a distinct pathogenesis (3, 6, 7, 9). Thus, further elucidation of the pathophysiology of PVT formation is needed in literature.

The composition of a thrombosis in the portal vein is quite enigmatic in the sense that it can recanalize in the absence of treatment unlike systemic venous thrombi (10). A recent study analyzed 16 prospective and 64 retrospective portal vein segments from cirrhotic patients using histology and electron microscopy demonstrated that not only was the PVT contributing to the occlusion of the portal vein lumen, but rather the thickening of the tunica intima was also present (23). This appearance resembled intimal fibrosis and demonstrated that the thrombus formation found in the portal vein is more complex when compared to systemic venous thrombi. In addition, in 1/3rd of the cases they found fibrinogen-rich blood clots which was distinct to those described in deep vein thrombi or arterial clots (23, 24). A study showed reduced incidence of PVT in patients given prophylactic ATIII and danaparoid sodium with liver cirrhosis and portal hypertension after splenectomy demonstrates that the etiopathogenesis of a thrombosis differs substantially in comparison to a systemic thrombosis and thus must be treated differently (25).

The formation of PVT in liver cirrhosis is associated with certain risk factors. A retrospective study with 98 cirrhotic patients with PVT and 101 cirrhosis without PVT demonstrated risk factors that contribute to the formation of PVT in cirrhotic patients. This study demonstrated an increase occurrence of PVT in advanced cirrhotic patients which confirmed previous studies. In this study it was demonstrated that patients with hyperglycaemia, hypoalbuminemia, anemia, hyperbilirubinemia, and elevated INR (international normalised ratio) levels, were statistically more likely to have thromboses compared with those of the controls (26, 27). Another significant risk factor leading to PVT that was seen in patient within this study was having HBV which was also seen in a similar study (28). These risk factors have been associated with PVT formation in patients with liver cirrhosis and portal hypertension which have been confirmed in prior studies (29–31). In sight of the many studies demonstrating risk factors for the etiopathogenesis of PVT development in cirrhosis, a meta-analysis of these studies would provide further insight on those that are truly significant.

Clinical features

The prevalence of PVT formation is generally low in the general population, but increased in individuals who have advanced liver cirrhosis with portal HTN. Studies have shown that the prevalence of PVT in cirrhosis with portal HTN increases proportionally with the severity of the disease (2, 32, 33). One study showed that 219 cirrhotic patients awaiting liver transplantation had an overall prevalence PVT that was 15.9% (2), supporting the reported prevalence range of 8%–25% of PVT in advanced liver cirrhosis found in similar studies (34, 35).

The clinical presentation of PVT is classified based on certain criteria. This includes whether the PVT is acute or subacute or chronic; occlusive vs. nonocclusive; benign vs. malignant, and intrahepatic vs. extrahepatic (2, 36–41). Depending on the criteria that is fulfilled on initial presentation determines the severity of symptoms. For example, a partially occluded acute portal vein thrombosis may be asymptomatic and present with nonspecific symptoms. In comparison, a completely occluded thrombosis in an acute phase can present with acute or progressive abdominal pain with signs of decompensation of chronic liver disease in the form of variceal bleeding, worsening ascites, bloody diarrhea, peritonitis, intestinal ischemia, or portal cholangiopathy. In a cirrhotic patient, sudden clinical deterioration such as the development of bacterial peritonitis can indicate the formation of an acute PVT through the unknown pathogenetic interaction of bacterial translocation, decreased portal blood flow velocity, and intimal hyperplasia of the portal vein wall. Intestinal infarction is a significant risk factor when the propagation of the thrombus extends to the superior mesenteric vein, mesenteric arches, and/or splenic vein (42).

The severity of portal hypertension in association with the extension of a portal vein thrombosis in cirrhotic patients correlates to an increased risk of complications. A cirrhotic patient with a PVT has greater than a threefold bleeding risk in comparison to a similar patient without a PVT irrespective of the use of endoscopic hemostasis or surgical shunting (43). In an acute complete occlusion of the portal vein, hepatic arterial vasodilatation typically preserves liver function (38, 42). Following a period of 3–5 weeks, the obstructed PVT is bypassed through the formation of venous collateral which is known as a portal cavernoma (39, 42).

Two separate studies showed that PVT in cirrhosis delayed the time to endoscopically fix esophageal varices, while also serving as an indicating factor of decompensation with poor diagnosis (44, 45). Contrary to these findings, two studies demonstrated no association between PVT development and prognosis (46, 47). A partial PVT that spontaneously resolved demonstrated a potential indication for improvement in liver function, but did not contribute to clinical outcome of a cirrhotic patient (48, 49). In comparison to benign, chronic PVT formation with a mortality rate of less than 10%, malignant PVT formation in the presence of liver cirrhosis secondary to HCC increases the mortality rate by 26% (50, 51). This demonstrates that PVT in liver cirrhosis increases the mortality risk of a patient irrespective of inciting factors.

Diagnosis

There are many classifications of portal vein thrombosis. The Yerdel Classification is the most widely used because it can predict outcomes, correlates with surgical technique and with complication rates (33).

(i) Grade I: Partial PVT wherein the thrombus occupies less than 50% of the diameter.

(ii) Grade II: The obstruction occupies greater than 50% of the vessel lumen with or without minimal extension into the superior mesenteric veins.

(iii) Grade III: Complete obstruction of the portal vein with extension into the proximal part of the superior mesenteric vein.

(iv) Grade IV: Complete thrombosis of the portal vein along with proximal and distal parts of the superior mesenteric veins.

There are several different diagnostic modalities to evaluate for portal vein thrombosis as listed below:

Ultrasonography

Ultrasonography and doppler ultrasonography are typically first-line imaging modalities to evaluate for PVT in cirrhosis with doppler ultrasonography having greater than 75% sensitivity (44). The identification of a thrombus, absent visualization of the hepatic veins, collateral veins along with caudate lobe hypertrophy, and a caudate vein with greater than 3 mm diameter (44). An acute thrombus typically shows heterogenous material in the vessel lumen although it can also be hypoechoic or isoechoic (45). In contrast, a chronic thrombus will show increased hyper-echogenicity due to fibrinous composition (46). A thrombus can also show an absence of blood flow partially or completely in a vessel lumen on a color doppler or have an increase in vessel diameter of greater than 13 mm (45). In a study conducted in 1991 on the efficacy of color doppler imaging in PVT revealed that color doppler ultrasonography had a sensitivity of 89%, specificity of 92%, and an accuracy of 92% (47).

Contrast enhanced ultrasonography (CEUS) is another useful tool to evaluate for portal vein thrombosis wherein microbubble contrast is injected intravenously for easier detection of the blood flow. There is a higher sensitivity (90.9%) and specificity (100%) of detection when compared to color doppler ultrasonography (48, 49). CEUS also has the highest rates of detection and characterization when compared to CT imaging, ultrasonography, and color doppler ultrasonography (52).

Computed tomography scan (CT scan)

On an unenhanced CT, fresh thrombi are typically hyperdense whereas the chronic thrombi can go undetected unless calcifications are present (53). In contrast-enhanced CT imaging, the lumen of the thrombosed vein does not enhance when compared to other vascular structures with periportal enhancement in some cases likely secondary to proliferation of the vasa vasorum of the portal vein (54). Dual-energy multidetector CT scan with iodine quantification has an even better performance for differentiating benign from malignant PVT based on the iodine-uptake assessment (53).

In a study conducted on 174 cirrhotic patients, it was noted that patients with a larger portal vein diameter especially greater than 12.5 mm on CT angiography had a higher risk of PVT development (55).

Magnetic resonance imaging (MRI)

In MRIs, rapid vascular flow creates a lack of signal on T1 or T2 enhanced images whereas slow or stagnant flow secondary to thrombi will create a bright intraluminal signal (54). Post contrast MRIs, Gadoxetic Acid-enhanced MR Imaging, and subtraction imaging are helpful in differentiating benign versus malignant portal vein thrombi in cirrhotics based on enhancement in arterial, portal venous, and delayed phases whereas diffusion weighted MRI has a low sensitivity to differentiate the two (56–58).

Gadoxetic acid-enhanced MRI is superior to contrast enhanced CT in terms of sensitivity and specificity in the detection of PVTs in patients with HCC meeting the Milan criteria. Hence, it is recommended that all patients who were not considered to be ideal liver transplant candidates due to the presence of PVT on contrast enhanced CT should undergo gadoxetic acid-enhanced MRI to confirm the presence of PVT (59).

MR angiography has multiple advantages when compared to ultrasonography with respect to having an unrestricted field of view, insensitivity to bowel gas or body habitus, and accommodate multiple views not limited by acoustic windows (60). MRIs which include Magnetic resonance angiography (MRA) have a very high sensitivity and specificity in detecting PVTs at 100% and 98–100%, respectively, (60, 61).

Angiography

Angiography is a less commonly used method due to its invasive nature where in contrast is administered with concurrent use of vasodilators to optimize for venous enhancement and opacification. This is not a commonly used method but, still used to evaluate the status of the portal venous system, patency of vessels, vascular pressures, collateral flow pathways, and thrombi (54).

Management

When considering treatment, several factors need to be taken into consideration. Some studies suggest that PVT is associated with increased decompensation and mortality risk, while others indicate that it merely indicates cirrhosis progression. Bleeding remains a feared complication. In transplant candidates, the presence of PVT affects surgical technique and may affect survival.

Anticoagulation

Anticoagulation is typically administered in a non-cirrhotic portal vein thrombosis (62), whereas in cirrhotic patients, there is controversy surrounding the need for anticoagulation as many patients have varices which render them prone to gastrointestinal bleeds. Major indications for anticoagulation in cirrhotic PVT include acute symptomatic PVT, liver transplant candidates and in individuals with thrombus extension to the mesenteric veins. Two meta-analyses have stated that in cirrhotic PVT, the rate of portal vein recanalization, complete portal vein recanalization, and thrombus progression after anticoagulation therapy is much higher when compared to untreated cirrhotic PVT (63, 64). Approximately, two thirds of cirrhotic patients with PVT achieved portal vein recanalization after anticoagulation and approximately half of that subset of patients achieved complete portal vein recanalization (63). Although bleeding complications are feared, when examining bleeding events in treatment versus control groups, those who were anticoagulated had less incidence of bleeding events. This may correlate with the reduction in portal pressure in those treated with anticoagulation therapy.

In a meta-analysis conducted on the effect of anticoagulation in portal vein thrombosis, it was noted that 71% of the patients underwent portal vein recanalization in the anticoagulation-treated group and 42% underwent portal vein recanalization without anticoagulation. The rates included both partial and complete portal vein recanalization. Despite this, only 53% of the anticoagulant treated groups underwent complete portal vein recanalization when compared to the 33% in the non-anticoagulation group in six of the studies. This shows that anticoagulation does not guarantee but, may only increase chances of complete portal vein recanalization. The meta-analysis also reported no significant differences in major or minor bleeding events between anticoagulation vs. non-anticoagulation treated groups in six of the studies (65). Several studies have described the effects of anticoagulation and its complications which are listed in Table 1. Case reports, case series, and foreign language manuscripts were excluded in Table 1.

TABLE 1
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Table 1. Studies of portal vein thrombosis treated with anticoagulation.

Choice of anticoagulation agent

Low molecular weight heparin (LMWH) and direct oral anticoagulants (DOACS) are considered safe in patients with cirrhosis and PVT. The drug selection needs to be individualized and adverse effects need to be discussed with the patient. Warfarin therapy has a narrow therapeutic window and the baseline elevation of the PT (prothrombin time) and INR in these patients creates difficulty for monitoring and dosing. Although, LMWH does not require monitoring, it does however include only injections which may be uncomfortable for the patient but, has potentially lesser side effects.

A meta-analysis on DOACs reported that the pooled rate of PVT recanalization among cirrhotic patients was 87.3% versus 44.1% in DOACs versus vitamin K antagonists (VKA) respectively. DOACs were associated with an overall lower pooled risk of major bleeding events when compared to VKAs but, have similar pooled risks of variceal bleeding and death (86). Rivaroxaban is contraindicated in patients with Child Pugh Group B and C cirrhosis with potential to be hepatotoxic (87–89). Apixaban has no warnings against its use in patients with Child Pugh Group A and B cirrhosis (87, 88). Edoxaban has both hepatic and renal clearance whereas dabigatran has predominantly renal clearance (90, 91). As per a review published in 2019, DOACs and LMWH may be safer and more efficacious than warfarin. To a large extent, it appears that DOACs may be safer and a more convenient option in PVT in cirrhotics all for the exception of rivaroxaban due to its hepatotoxic potential (89). Historically, warfarin and LMWH has been preferred due to familiarity and reversal agents. However, it is important to keep in mind that DOACs also have reversal agents in the event of major bleeding events. Despite this, further randomized clinical trials need to be conducted to assess safety and efficacy of DOACs in PVT in cirrhosis and to establish a new standard of care.

The AGA (American Gastroenterological Association Institute) guidelines recommend anticoagulation over no anticoagulation for the treatment of acute or subacute PVT in patients with cirrhosis (92). The EASL (European Association for the Study of the Liver) guidelines also have mentioned that anticoagulation have led to partial or complete recanalization of PVT in cirrhotic patients but, have not formally recommended this as larger randomized clinical trials would be needed to assess for morbidity and mortality (93). Although, EASL guidelines have not formally recommended DOACs for the treatment of PVT, they do recommend using DOACs in the treatment of deep vein thrombosis/pulmonary embolism (DVT/PE) in patients with Child-Pugh class A cirrhosis. They recommend using DOACs with caution in patients with Child-Pugh class B cirrhosis and in those with a creatinine clearance of less than 30 ml/min and advise against DOACs in Child-Pugh class C cirrhosis (93). This could be applied to the treatment for PVT as well although, data is limited. The AASLD (American Association for the Study of the Liver) guidelines have stated treatment for PVT is weak due to lack of clinical trials and the indication for anticoagulation should be dependent on the patient while considering the expected benefits for the patient and decreasing risk for clot extension (44). The AASLD guidelines also state that the non-portal hypertensive bleeding rates among cirrhotics compared to the general population on therapeutic anticoagulation appear to be similar with portal hypertensive bleeding rates among cirrhotics appear to be unchanged by anticoagulation (44).

Based on the guidelines mentioned above and the studies summarized in Table 1, it can be stated that anticoagulation for PVT in cirrhotics should not be feared and may even be recommended especially in the cases of acute and subacute PVT. Individualized bleeding risks should be analyzed prior to initiation of anticoagulation such as evaluating for portal hypertensive gastropathy, unbanded varices, etc. The type of anticoagulation used must be individualized based on their class of cirrhosis, renal function, and compliance with injectables and INR monitoring. Patients can be followed up closely to evaluate for medication related adverse effects, thrombus progression or bleeding complications.

Table 2 summarizes studies regarding the natural history of portal vein thrombosis in patients who did not undergo any form of intervention.

TABLE 2
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Table 2. Studies which depict the natural history of PVT in cirrhotic without anticoagulation.

Transjugular intrahepatic portosystemic shunt (TIPS)

Transjugular intrahepatic portosystemic shunt (TIPS) is a procedure that involves inserting a stent into the portal veins to recanalize the portal vein and reduce portal hypertension especially in patients with severe portal hypertensive symptoms such as recurrent gastrointestinal bleeding and refractory ascites (94). With the development of real-time visualization of the portal vein during TIPS, PVT is no longer considered as an absolute contraindication to TIPS placement (95). A retrospective study comparing the Yerdel grade of PVT showed that anticoagulation had an association with worsening of portomesenteric thrombosis when compared to TIPS (96). This study revealed that 72%–78% of TIPS patients, 27%–29% of anticoagulated patients, and 10%–17% of untreated patients at early and late follow-up showed an improvement in thrombus burden (96).

There was another study that evaluated the efficacy of TIPS in combination with anticoagulation or antiplatelet therapy which revealed that warfarin was superior to aspirin or clopidogrel in achieving partial or complete recanalization of PVT (97). A retrospective study analyzed data from 189 patients who underwent TIPS on chronic PVT depicted that there was a significant reduction in portal vein pressure, decreased rebleeding rates, and no significant different in hepatic encephalopathy (98). Angiojet thrombus aspiration technology has also been used simultaneously during TIPS which was studied on 63 patients with acute PVT and resulted in a 100% success rate. There were only 2 cases of biliary tract injuries and two cases of intrahepatic arteriovenous fistula as postprocedural complications. During the follow-up period, 74.61% had complete portal vein recanalization and 20.63% had partial recanalization (99).

A recently published randomized, controlled trial (2018) compared TIPS with covered stents versus endoscopic band ligation (EBL) plus propranolol for the prevention of variceal rebleeding among patients with cirrhosis and PVT (100). A total of 29 cirrhotic patients (94% Child-Pugh class A or B) with PVT and a recent variceal bleed (6 weeks) were randomly allotted to TIPS intervention (n = 24) versus the EBL and propranolol group (n = 25), respectively (100). The primary endpoint was variceal rebleeding (100). The study found that variceal rebleeding was significantly less frequent in the TIPS group (15% vs. 45% at 1 year and 25% versus 50% at 2 years, respectively; HR = 0.28, 95% CI 0.10 to 0.76, p = 0.008) (100). Hence, TIPS placement in patients with decompensated cirrhosis and PVT was more effective than EBL and propranolol combined for the prevention of rebleeding. Although, this did not improve translate into improved overall survival.

Another randomized, controlled trial (2015) randomly assigned 73 patients to either receive TIPS (n = 37) or EBL plus propranolol (n = 36) (101). This shows that TIPS may be more effective than EBL plus propranolol in preventing recurrent esophageal variceal bleeding (101). The 2-year probability of remaining free of variceal bleed in advanced cirrhosis with PVT was higher in the TIPS group (77.8%) than in the EBL group (42.9%) (value of p = 0.002) (101).

The AASLD guidance recommends portal vein recanalization (PVR) followed by TIPS in liver transplant candidates with chronic PVT which impedes the physiological anastomosis between graft and host portal vein (44). The AASLD guidance also recommends PVR followed by TIPS in patients with chronic PVT and recurrent bleeding and/or recurrent ascites which is not medically or endoscopically manageable (44). The various studies and clinical trial describing TIPS in cirrhotic patients with PVT are described in Table 3.

TABLE 3
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Table 3. Studies of portal vein thrombosis treated with TIPS.

Thrombolysis

Endovascular thrombolysis is performed using multihole infusion catheters when anticoagulation alone is insufficient. They are commonly performed in conjunction to TIPS placement or mechanical thrombectomy. There are two major methods of thrombolysis which include the transvenous method wherein fibrinolytic agents such as tissue plasminogen activator or heparin are injected into the PVT directly. The other method is by using an ultrasound-accelerated infusion catheter wherein a fibrinolytic agent is injected into the clot and the ultrasound waves would additionally disrupt the clot integrity and aid in better resolution of the thrombus (124, 125). Thrombolysis typically achieves partial recanalization only and is likely more beneficial if combined with another technique such as thrombectomy (126). Several contraindications exist for thrombolysis which include a recent stroke, gastrointestinal bleeding, recent orthopedic, cranial, or spinal trauma, and the presence of an intracranial tumor (124, 125).

Mechanical thrombectomy

Mechanical thrombectomy is the restoration of flow within the main portal vein using balloon thrombectomy, rheolytic thrombectomy, or suction thrombectomy (127). Balloon thrombectomy is a procedure wherein a balloon is inflated past the clot which is subsequently retracted over the guidewire to pull the clot into a patent vein and then washed away. Rheolytic therapy uses high-velocity saline jets for the destruction of the thrombus. Suction thrombectomy involves using vacuum-based tools to suction the clot (127). Other methods such as an aspiration mechanical thrombectomy used simultaneously during TIPS is also another effective and safe treatment of PVT (128). A recently published study describes the successful resolution of PVT using large bore thrombectomy in conjunction with the Inari FlowTriever device during or after TIPS placement (129).

Treatment algorithm of portal vein thrombosis

The suggested treatment algorithm of PVT is as described in Figure 1.

FIGURE 1
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Figure 1. Treatment algorithm of portal vein thrombosis.

Prevention

The prevention of PVT in cirrhosis is still an area that is currently undergoing research. A randomized controlled trial studying 70 cirrhotic patients showed that PVT was prevented at 96 weeks in the group that received 4,000 IU of enoxaparin versus 10 out of 36 controls developed PVT (130). Another study stratified risk of PVT based on antithrombin levels where high and highest risk cirrhotic patients received antithrombin III concentrates and danaparoid sodium which resulted in a low incidence of PVT (25). Another randomized controlled trial showed that warfarin is more effective than aspirin in preventing PVT after a laparoscopic splenectomy in cirrhotics while also providing hepato- and nephroprotective effects (131).

Conclusion

This review intends to evade the fear of anticoagulation and interventional strategies in patients with cirrhosis. It was written to enhance the knowledge of managing portal vein thrombosis in cirrhosis as it may help in reducing portal hypertensive complications. Despite the guidance on the management of PVT, an individualized assessment of risks vs. benefits is necessary when deciding between different treatment strategies.

Author contributions

All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

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Keywords: portal vein, cirrhosis, anticoagulation, thrombosis, portal hypertension, bleeding, rebalanced hemostasis

Citation: Prakash S, Bies J, Hassan M, Mares A and Didia SC (2023) Portal vein thrombosis in cirrhosis: A literature review. Front. Med. 10:1134801. doi: 10.3389/fmed.2023.1134801

Received: 30 December 2022; Accepted: 03 March 2023;
Published: 26 April 2023.

Edited by:

Carlos Jerjes-Sanchez, Tecnológico de Monterrey, Mexico

Reviewed by:

Ton Lisman, University Medical Center Groningen, Netherlands
Yong Lv, Air Force Medical University, China

Copyright © 2023 Prakash, Bies, Hassan, Mares and Didia. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: S. Claudia Didia, Sclaudia.Didia@ttuhsc.edu

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