Partial splenic artery embolization in cirrhotic patients

Splenic artery embolization for variceal bleeding in portal hypertension: a systematic review and metanalysis

PURPOSE

Splenic artery embolization (SAE) has emerged as a promising alternative for managing variceal bleeding secondary to portal hypertension (PH). This study aims to elucidate the significance of SAE in managing esophageal variceal bleeding in patients with PH, providing an overview of its efficacy, safety, and role in PH management.

METHODS

A systematic review and meta-analysis were conducted in accordance with PRISMA standards. EMBASE, PubMed, Scopus, and Web of Science databases were searched from inception until April 14, 2024. Original observational and clinical studies on SAE in managing variceal bleeding due to PH were included. Meta-analyses were performed using a random-effects model, and publication bias was assessed using regression and rank correlation tests for funnel plot asymmetry.

RESULTS

Eighteen studies met the inclusion criteria, encompassing 531 patients. The meta-analysis revealed a significant reduction in variceal bleeding post-SAE (RD = -0.86; 95% CI: -0.97, -0.75; p < 0.001). Complete resolution of varices was observed in 26% of patients (95% CI: 11%, 45%; p = 0.006), and 78% showed improvement in variceal grade (95% CI: 43%, 88%; p < 0.001). SAE significantly increased platelet counts (SMD = 1.15; 95% CI: 0.63, 1.68; p < 0.001). Common complications included post-embolization syndrome, and the overall complication rate was low.

CONCLUSIONS

This systematic review and meta-analysis study supports the efficacy and safety of SAE in managing variceal bleeding due to PH, demonstrating significant reductions in bleeding, improvements in variceal grade, and increases in platelet counts.

Partial splenic embolization with embosphere microspheres (700-900 µm) for the treatment of hypersplenism: comparison of selective superior splenic artery embolization and inferior splenic artery embolization

OBJECTIVE

To compare clinical outcomes of superior versus inferior splenic artery embolization in partial splenic embolization (PSE) and identify predictors of major complications.

MATERIAL AND METHODS

This retrospective case-control study included 73 patients who underwent PSE between May 2005 and April 2021. They were divided into two groups: the superior and middle splenic artery embolization group (Group A, n = 37) and the inferior and middle splenic artery embolization group (Group B, n = 36). Outcome differences and major complications between the groups were assessed. Logistic regression was used to analyze potential predictors of major complications, and the optimal cutoff value for splenic embolization rates was determined using the Youden index.

RESULTS

There were no significant differences in laboratory and radiological outcomes between the two groups. Group A had a significantly lower incidence of major complications than Group B (p = 0.049), a lower Visual Analog Scale (VAS) score for pain (p = 0.036), and a shorter hospital stay (p = 0.022). Independent risk factors for major complications included inferior and middle splenic artery embolization (odds ratio [OR] = 3.672; 95% confidence interval [CI] = 1.028-13.120; p = 0.045) and a higher spleen embolization rate (OR = 1.108; 95% CI = 1.003-1.224; p = 0.044). The optimal cutoff for spleen embolization rate to predict major complications was 59.93% (sensitivity 77.8%, specificity 63.6%).

CONCLUSION

Using 500-700 µm microspheres for PSE, targeting the middle and superior splenic artery yields similar effects to targeting the middle and inferior artery, but results in lower rates of major complications and shorter hospital stays. To effectively minimize the risk of major complications, the embolization rate should be kept below 59.93%, regardless of the target vessel.

The role of partial splenic artery embolization in the management of refractory esophageal variceal bleeding due to portal vein thrombosis

BACKGROUND

Gastro-esophageal variceal hemorrhage (GEVH) is one of the major causes of life-threatening gastrointestinal bleeding in children. Medical, endoscopic, angiographic, and surgical interventions can be utilized in treatment. In this case report, we describe partial splenic artery embolization for refractory GEVH due to portal vein thrombosis.

CASE PRESENTATION

A 3-year-old male patient was admitted with abdominal distension. He had been followed up for hepatosplenomegaly for 2 years. The patient's body weight was 15.5 kg (50-75th percentile, 0.69 SDS) and height was 96 cm (50-75th percentile, 0.27 SDS). The general condition was moderate, and the skin appeared pale. The liver was palpable 2 cm, and the spleen was palpable 6 cm below the costal margin. Other system examinations were normal. Laboratory findings included hemoglobin (Hgb) of 7.1 g/dL, hematocrit (Hct) of 24%, white blood cell count of 9800/mm3, platelets of 67000/mm3, and INR of 1.3. Abdominal CT angiography demonstrated a hypodense thrombus at the portal confluence, almost completely occluding the lumen. Endoscopy revealed esophageal varices at the 2 and 7 o'clock positions in the distal esophagus, which became more prominent with insufflation and had red spots on them. Hyperemia was observed in the corpus and antrum of the stomach. Findings were consistent with stage 3 esophageal varices and increased vascularity in the duodenum due to portal vein thrombosis. Medical treatment with a proton pump inhibitor and beta-blocker was initiated. The patient underwent endoscopic band ligation (EBL) three times over 9 months. Despite EBL, the patient presented with GEVH three times during a 1.5-year follow-up. Due to newly developed multiple varices observed on control endoscopy a decision was made to perform splenic artery embolization. Interventional radiology performed selective lower splenic pole embolization. Six months later, the patient underwent another selective embolization. The patient has been followed up for 3 years without GEVH.

CONCLUSIONS

In this case, splenic artery embolization was observed to be an effective, repeatable, and safe treatment method for patients with hypersplenism caused by portal hypertension and refractory esophageal variceal bleeding.

Clinical benefits of partial splenic embolization for cancer patients

Partial splenic embolization (PSE) has developed as an alternative to surgical splenectomy, mainly to improve hypersplenism and esophagogastric varices in cirrhotic patients. We proposed the novel concept that splenic infarction volume, rather than the splenic infarction ratio, is essential for patients receiving PSE. A splenic infarction volume between 388 and 540 mL is suitable for a sufficient increase in platelet count and less severe PSE-related complications. When restricted to patients with massive splenomegaly >700 mL, the noninfarcted volume of the spleen plays an important role in increasing platelet counts. Based on the splenic volume concept, PSE or laparoscopic splenectomy should be selected. Partial splenic embolization is effective for cancer patients with hypersplenism. Hypersplenism can occur due to portal vein congestion by thrombosis or tumor thrombosis, and hepatic sinusoidal obstruction syndrome after oxaliplatin-including chemotherapy other than liver cirrhosis. Therefore, PSE has been emphasized as a pretreatment intervention for invasive treatments for cancer patients and is applied synchronously with systemic chemotherapy or chemoembolization for patients with liver malignancies. It was reported that additional PSE on chemoembolization can prolong progression-free survival for patients with hepatocellular carcinoma. Moreover, PSE can improve liver function and fibrosis, promote liver regeneration, and activate host immunity. Partial splenic embolization can result in thrombocytosis (<200 × 109/L), but this platelet count is unlikely to promote cancer progression. Partial splenic embolization can improve hypersplenism caused by various factors related to the patient's comorbidity and cancer treatment. Our splenic volume concept helps identify appropriate treatment procedures. A proper understanding of PSE and its dissemination is strongly required.

Efficacy of endoscopic therapy combined with partial splenic embolization versus Hassab's operation for patients with liver cirrhosis with esophageal variceal bleeding and hypersplenism: a multicenter cohort study based on propensity score matching

BACKGROUND

The prognosis comparison between endoscopic therapy + partial splenic embolization (PSE) and Hassab's operation is unclear in the treatment of esophageal variceal bleeding in patients with liver cirrhosis. This study aimed to compare the outcome of endoscopic therapy + PSE (EP) with a combination of splenectomy + pericardial devascularization procedure, known as Hassab's operation (SH) for esophageal variceal bleeding in patients with liver cirrhosis with hypersplenism.

METHODS

We enrolled 328 patients, including 125 and 203 patients who underwent EP and SH, respectively. Each group consisted of 110 patients after propensity score matching (PSM). Subsequently, we recorded and analyzed bleeding episodes and mortality in 6 months and 1, 2, and 5 years after therapies.

RESULTS

The median follow-up time in the EP and SH groups was 53 and 64 months, respectively. Bleeding incidence 6 months after therapies in the EP group was lower than that in the SH group (1.8% vs. 10.0%, P = 0.010). Additionally, complications in the perioperative period were not significantly different (0% vs. 3.6%, P = 0.008). However, the bleeding rate between the two groups was not significantly different at 1, 2, and 5 years after therapies (7.3% vs. 12.7%, P = 0.157; 10.9% vs. 16.4%, P = 0.205; 30.6% vs. 31.8%, P = 0.801), as well as mortality rate (4.5% vs 7.3%, P = 0.571).

CONCLUSION

Compared with SH therapy, the bleeding rate 6 months after EP therapy was lower, but the long-term bleeding rate was similar.

Splenic artery embolization complicated by pleural effusion

This case report and review describes a 31-year-old man with a history of chronic pancreatitis who presented to the hospital with shortness of breath and left-sided chest pain. Three days prior, he underwent mid-splenic artery embolization due to hematemesis attributed to a splenic artery pseudoaneurysm associated with a peripancreatic pseudocyst. Upon this presentation, the patient reported increasing shortness of breath, left-sided pleuritic chest pain, and epigastric and left upper quadrant abdominal pain. Imaging revealed left pleural effusion, splenic infarcts, and adjacent fluid collections. Thoracentesis confirmed an exudative effusion. The pleural effusion was attributed to recent splenic artery embolization, and the patient was discharged on appropriate medications in stable condition on the sixth day of hospitalization. This case underscores the importance of considering embolization-related complications in the differential diagnosis of pleural effusions following such procedures. The etiology, diagnosis, and management of splenic artery aneurysms are discussed in this review.

Partial Splenic Artery Embolization for the Management of Symptomatic Hypersplenism in Portal Hypertension: Clinical Insights from a Case Series

BACKGROUND AND AIMS

Partial splenic artery embolization (PSAE) is an alternative treatment modality for managing hypersplenism secondary to portal hypertension. We are presenting a case series of patients with portal hypertension who underwent PSAE for symptomatic hypersplenism.

METHODS

We included patients with portal hypertension who underwent PSAE from January 2022 to December 2022. Patients' characteristics and procedure related complications were noted. Data were analyzed for improvement in the hematological parameters.

RESULTS

A total of 11 (7 women, median age 34 [18-56] years) patients were included. Three patients were cirrhotic (hepatitis B-2, metabolic dysfunction-associated steatotic liver disease -1) and 8 were non-cirrhotic (extra-hepatic portal vein obstruction-5, Non cirrhotic portal fibrosis-3). Splenic artery aneurysm was concomitantly present in 5 cases. Technical success was achieved in all cases. Post embolization, hemoglobin, white blood cells and platelet counts improved at 4 weeks, 12 weeks and 24 weeks along with symptomatic improvement. All patients had post-embolization syndrome. One patient developed transient ascites and secondary bacterial peritonitis which was managed conservatively. One patient died due to splenic abscess and septicemia.

CONCLUSION

Although, hematological parameters and symptoms improve post procedure, PSAE is associated with major complications and should be performed judiciously in selected cases only. Graphical abstract is presented in Figure 1.

Radiological and Surgical Treatments of Portal Hypertension

Interventions for portal hypertension are continuously evolving and expanding beyond the realm of medical management. When complications such as varices and ascites persist despite conservative interventions, procedures including transjugular intrahepatic portosystemic shunt creation, transvenous obliteration, portal vein recanalization, splenic artery embolization, surgical shunt creation, and devascularization are all potential interventions detailed in this article. Selection of the optimal procedure to address the underlying cause, treat symptoms, and, in some cases, bridge to liver transplantation depends on the specific etiology of portal hypertension and the patient's comorbidities.

A systematic review of diagnostic and interventional techniques in non-occlusive hepatic artery hypoperfusion syndrome

OBJECTIVE

This systematic review aims to elucidate the diagnostic capabilities of imaging techniques in identifying Non-Occlusive Hepatic Artery Hypoperfusion Syndrome (NOHAH) and to evaluate the efficacy and outcomes of splenic artery embolization (SAE), including the choice and placement of embolic agents.

MATERIALS AND METHODS

A comprehensive literature search was conducted using PubMed, CINAHL, and Scopus databases, adhering to PRISMA guidelines. Fifteen studies encompassing 240 patients treated with embolization (using coils or Amplatzer Vascular Plugs (AVP)) were analyzed. Key metrics assessed included patient demographics, embolization techniques, embolic agents, technical success, radiologic findings pre- and post-embolization, and complication rates.

RESULTS

Among the 240 patients studied, 177 (73.8%) were reported by gender, with a majority being male (127/177, 71.7%). Doppler ultrasonography (DUS) emerged as the primary initial screening tool in 80% of studies. The hepatic arterial resistive index (RI) was a critical parameter, with mean values significantly decreasing from 0.84 pre-embolization to 0.70 post-embolization (p < 0.001). All cases confirmed technical success via digital subtraction angiography, revealing delayed hepatic arterial filling without stenosis or thrombosis. Coils were the predominant embolic agent, used in 80.8% of patients, followed by AVP in 16.3%. The overall mortality rate was 4.58%, with 29 major and 3 minor complications noted. Notably, proximal placement of coils in the splenic artery was associated with lower mortality rates compared to distal placement and showed comparable complication rates to AVPs.

CONCLUSION

DUS is a reliable screening modality for NOHAH, with post-SAE assessments showing significant improvements. The choice and location of embolization significantly impact patient outcomes, with proximal placement of coils emerging as a preferable strategy due to lower mortality rates and comparable complication profiles to alternative methods.

The role and evolution of partial splenic embolization over three decades: A multicentric retrospective single cohort study of 90 patients from French nationwide experience

BACKGROUND

Partial splenic embolization (PSE) has been proposed to treat the consequences of hypersplenism in the context of portal hypertension, especially thrombocytopenia. However, a high morbidity/mortality rate has made this technique unpopular. We conducted a multicenter retrospective nationwide French study to reevaluate efficacy and tolerance.

METHODS

All consecutive patients who underwent PSE for hypersplenism and portal hypertension in 7 tertiary liver centers between 1998 and 2023 were included.

RESULTS

The study population consisted of 91 procedures in 90 patients, with a median age of 55.5 years [range 18-83]. The main cause of portal hypertension was cirrhosis (84.6 %). The main indications for PSE were (1) an indication of medical treatment or radiological/surgical procedure in the context a severe thrombocytopenia (59.3 %), (2) a chronic hemorrhagic disorder associated with a severe thrombocytopenia (18.7 %), and (3) a chronic pain associated with a major splenomegaly (9.9 %). PSE was associated with a transjugular intrahepatic portosystemic shunt in 20 cases. Median follow-up after PSE was 41.9 months [0.5-270.5]. Platelet count increased from a median of 48.0 G/L [IQR 37.0; 60.0] to 100.0 G/L [75.0; 148]. Forty-eight patients (52.7 %) had complications after PSE; 25 cases were considered severe (including 7 deaths). A Child-Pugh B-C score (p < 0.02) was significantly associated with all complications, a history of portal vein thrombosis (p < 0.01), and the absence of prophylactic antibiotherapy (p < 0.05) with severe complications.

CONCLUSION

Our results strongly confirm that PSE is very effective, for a long time, although a quarter of the patients experienced severe complications. Improved patient selection (exclusion of patients with portal vein thrombosis and decompensated cirrhosis) and systematic prophylactic antibiotherapy could reduce morbidity and early mortality in the future.

Thrombotic Thrombocytopenic Purpura in the Setting of Cirrhosis and Baseline Thrombocytopenia

The management of immune thrombotic thrombocytopenic purpura (iTTP) has evolved significantly over the past several years. However, despite recent advances, there are limited tools available for patients with comorbidities that preclude either the utilization of available treatment modalities or evidence-based laboratory target levels. Literature to guide the management of such patients is sparse at best, and many complications associated with pre-existing comorbidities in the context of iTTP have not been reported. Here we describe the case of a patient with severe thrombocytopenia at baseline due to liver cirrhosis who developed iTTP. The challenges of the case in terms of pursuing disease-directed treatment, defining laboratory parameters to guide treatment, and mitigating the risks of bleeding and disease exacerbation are discussed. We offer our perspective in treating iTTP in the setting of severe baseline thrombocytopenia and high bleeding risk.

The use of splenic embolization in immune thrombocytopenia: A systematic review and meta-analysis

The effectiveness of splenic embolization (SE) in treating refractory immune thrombocytopenia (ITP) remains uncertain. A systematic literature review was undertaken to assess the effectiveness and safety of SE in treating both paediatric and adult patients with ITP. We conducted an extensive search employing predefined criteria. We extracted platelet counts at baseline and at multiple intervals following SE, along with details of the proportion of embolized spleen parenchyma and the proportion of patients exhibiting complete or partial platelet count responses. We identified nine eligible reports for the analysis of effectiveness (228 patients) and 15 reports for the safety analysis (151 patients). Pooled estimates of complete response (platelet count >100 × 109/L) and overall response (platelet count >30 × 109/L) were 50.1% (95% CI: 38-62.3) and 74.4% (95% CI: 64.9-83.9) respectively. Most studies applied an embolization of at least 60% of the spleen parenchyma. Nearly all the patients suffered from mild adverse events (AEs), 1.3% suffered from serious AEs and one patient died (0.7%). In conclusion, SE resulted in an overall response rate in 74.4% of patients with ITP. However, this finding derives from uncontrolled studies of low to moderate quality.

Will partial splenic embolization followed by splenectomy increase intraoperative bleeding?

BACKGROUND

Partial splenic embolization (PSE) has been suggested as an alternative to splenectomy in the treatment of hypersplenism. However, some patients may experience recurrence of hypersplenism after PSE and require splenectomy. Currently, there is a lack of evidence-based medical support regarding whether preoperative PSE followed by splenectomy can reduce the incidence of complications.

AIM

To investigate the safety and therapeutic efficacy of preoperative PSE followed by splenectomy in patients with cirrhosis and hypersplenism.

METHODS

Between January 2010 and December 2021, 321 consecutive patients with cirrhosis and hypersplenism underwent splenectomy at our department. Based on whether PSE was performed prior to splenectomy, the patients were divided into two groups: PSE group (n = 40) and non-PSE group (n = 281). Patient characteristics, postoperative complications, and follow-up data were compared between groups. Propensity score matching (PSM) was conducted, and univariable and multivariable analyses were used to establish a nomogram predictive model for intraoperative bleeding (IB). The receiver operating characteristic curve, Hosmer-Lemeshow goodness-of-fit test, and decision curve analysis (DCA) were employed to evaluate the differentiation, calibration, and clinical performance of the model.

RESULTS

After PSM, the non-PSE group showed significant reductions in hospital stay, intraoperative blood loss, and operation time (all P = 0.00). Multivariate analysis revealed that spleen length, portal vein diameter, splenic vein diameter, and history of PSE were independent predictive factors for IB. A nomogram predictive model of IB was constructed, and DCA demonstrated the clinical utility of this model. Both groups exhibited similar results in terms of overall survival during the follow-up period.

CONCLUSION

Preoperative PSE followed by splenectomy may increase the incidence of IB and a nomogram-based prediction model can predict the occurrence of IB.

Perioperative proximal splenic artery embolization in cirrhotic patients with splenomegaly

INTRODUCTION

The purpose of this study was to determine the effect of proximal splenic artery embolization (SAE) in cirrhotic patients with splenomegaly who underwent surgical laparotomy.

MATERIAL AND METHODS

This retrospective observational study included 8 cirrhotic patients with splenomegaly. They underwent proximal SAE before- (n = 6) or after (n = 2) laparotomy. Vascular plugs or coils were placed in the proximal splenic artery. The diameter of the portal vein and the splenic volume were recorded. Clinical outcome assessments included platelet counts, the model for end-stage liver disease (MELD) score, and complications.

RESULTS

After embolization, the portal venous diameter was significantly smaller (pre: 13.6 ± 2.7 mm, post: 12.5 ± 2.3 mm, p = 0.023), the splenic volume was significantly decreased (pre: 463.2 ± 145.7 ml, post: 373.3 ± 108.5 ml, p = 0.008) and the platelet count was significantly higher (pre: 69.6 ± 30.8 × 103/μl, post: 86.8 ± 27.7 × 103/μl, p = 0.035). Before embolization, the median MELD score was 12; after embolization, it was 11 (p = 0.026). No patient developed post-treatment complications after embolization.

CONCLUSIONS

The reduction of hypersplenism by perioperative proximal SAE may be safe and reduce the surgical risk in cirrhotic patients with splenomegaly.

Diagnosis and management of ectopic varices in portal hypertension

Ectopic variceal bleeding is a rare cause of gastrointestinal bleeding that can occur in settings of cirrhotic and non-cirrhotic portal hypertension and is characterised by its development at locations remote from the oesophagus and stomach. Ectopic varices can be difficult to identify and access, and, although a relatively uncommon cause of portal hypertensive bleeding, can represent a difficult diagnostic and therapeutic challenge associated with considerable mortality. Low incidence and variance in variceal anatomy preclude large randomised controlled trials, and clinical practice is based on experience from case reports, case series, and specialist centre expertise. Optimisation of survival outcomes relies on understanding a patient's portal venous anatomy and functional hepatic reserve to guide timely and targeted endoscopic and endovascular interventions to facilitate the rapid control of ectopic variceal bleeding.

Two Cases of Gastric Varices with Left-sided Portal Hypertension Due to Essential Thrombocythemia Treated with Gastric Devascularization or Partial Splenic Embolization

Left-sided portal hypertension (LSPH) is a condition of extrahepatic portal hypertension that often results in bleeding from isolated gastric varices (GVs). LSPH is sometimes caused by myeloproliferative diseases, such as essential thrombocythemia (ET). We herein report two cases of GVs with LSPH due to ET that were successfully controlled by gastric devascularization (GDS) or partial splenic embolization (PSE). Since each patient with LSPH due to ET has a different pathology, optimal treatment should be performed depending on the patient's condition, such as platelet counts, hemodynamics, or the prognosis. We believe that these cases will serve as a reference for future cases.

Evaluation of splenic infarction ratio and platelet increase ratio after partial splenic artery embolization

OBJECTIVE

The spleen is part of the lymphatic system and is one of the least understood organs of the human body. It is involved in the production of blood cells and helps filter the blood, remove old blood cells, and fight infection. Partial splenic artery embolization (PSE) is widely used to treat pancytopenia and portal hypertension. The efficacy of PSE for improving thrombocytopenia has been well demonstrated. In this study, we evaluated the splenic infarction ratio and platelet increase ratio after PSE.

METHODS

Forty-five consecutive patients underwent PSE from January 2014 to August 2022. We retrospectively evaluated the splenic infarction volume and ratio after PSE and analyzed the relationship between the splenic infarction ratio and platelet increase ratio after PSE.

RESULTS

The platelet increase ratio was correlated with the splenic infarction ratio after PSE. The cutoff value for the splenic infarction ratio with a two-fold platelet increase was 63.0%.

CONCLUSION

We suggest performance of PSE in patients with a splenic infarction ratio of 63% to double the expected platelet count.

Refractory Immune Thrombocytopenic Purpura with Abdominal Splenosis: A Complex Case

Immune thrombocytopenia (ITP) is an acquired thrombocytopenia resulting from immune-mediated platelet destruction via antiplatelet antibodies and T cells. Medical management of ITP includes corticosteroids and multiple other adjunct therapies, with splenectomy generally being reserved for severe, refractory cases. In this clinical case report, we describe the evaluation of a 35-year-old male with a history of prior traumatic splenic injury who presented to the emergency department endorsing easy bruising and a petechial rash, ultimately found to have severe thrombocytopenia. The patient was diagnosed with primary ITP that proved to be refractory to a number of first- and second-line medical therapies. His course was complicated by the presence of abdominal splenosis discovered at the time of planned splenectomy and intra-abdominal hemorrhage requiring splenic artery embolization thereafter. To our knowledge, this is one of few published cases of ITP complicated by abdominal splenosis, highlighting the need to consider splenosis and the presence of accessory splenic tissue in cases of refractory ITP.

A Bridge to Banding: Splenic Artery Embolization in Hepatosplenic Schistosomiasis

Schistosomiasis is a parasitic infection endemic to sub-Saharan Africa. The severe form of disease, caused by deposition of Schistosoma eggs in the portal vein, is known as hepatosplenic schistosomiasis. We present a case of a 26-year-old woman with esophageal varices in the setting of hepatosplenic schistosomiasis. This patient underwent partial splenic artery embolization to treat thrombocytopenia secondary to splenic sequestration. After embolization and improvement of cell counts, the patient was successfully able to undergo variceal band ligation.

Splenic Artery Embolism in Liver Transplant Patients: A Single-Center Experience

BACKGROUND

Hypersplenism, portal hypertension, and ascites have been seen after liver transplants. Patients are usually treated medically with refractory patients potentially undergoing splenectomy. Splenic artery embolism (SAE) is an alternative that can be performed to limit the surgical intervention that may have the benefit of improving portal hypertension. Few studies have studied the effect on main portal vein (MPV) velocities and hepatic artery resistive indices (HARIs) which may be beneficial as markers of portal hypertension.

PURPOSE

This study aims to evaluate the efficacy and safety of interventional radiology (IR)-guided SAE for the management of portal hypertension in patients who have had liver transplants.

METHODS

A retrospective analysis was conducted on liver transplant patients who had undergone IR-guided SAE post-transplant at a single tertiary transplant center from 2012 to 2022. The primary outcome of intervention efficacy was quantified by peak HARIs and MPV velocities. Ultrasound with Doppler obtained before and after the intervention was reviewed for these parameters. Secondary outcomes included adverse events at the time of the procedure and within one year of the procedure, the need for splenectomy, and spleen size.

RESULTS

Twenty-eight patients met the criteria for inclusion. The mean age of patients was 52.5 years (21-71 years) and the time after transplant was 149.5 days (2-1588 days). About 96.4% of SAEs were technically successful (n=27). Twenty-one patients had MPV velocities available, and 24 had peak HARIs available. In these patients, HARIs decreased by an average of 0.063 (95% CI 0.014-0.112) after SAE. MPV velocity decreased by an average of 47.2 cm/s (95% CI 27.3-67.1) after SAE. About 10.4% of patients (n=3) developed a procedure-related complication, all of which were femoral access site aneurysms. No (0) patients suffered from bleeding, infections, or abscesses after the procedure. About 10.7% of patients (n=3) required splenectomy after SAE: one splenectomy was due to technical failure and two were due to refractory symptoms.

CONCLUSION

We performed one of the first analyses on MPV and RI and showed that our patients saw an improvement post-embolization with a theoretical improvement in portal hypertension. The complication rate and risk of infection seem to be acceptable risks, making SAE a feasible option for management.

Pediatric liver cirrhosis interventional procedures: from biopsy to transjugular intrahepatic portosystemic shunt

Cirrhosis is a complex diffuse process whereby the architecture of the liver is replaced by abnormal nodules because of the presence of fibrosis. Several pediatric diseases such as extrahepatic portal vein obstruction, biliary atresia, alpha-1-antitrypsin deficit and autoimmune hepatitis can lead to cirrhosis and portal hypertension in children. In this article the authors describe interventional radiology procedures that can facilitate the diagnosis and treatment of diseases associated with liver cirrhosis and portal hypertension in the pediatric population. These procedures include image-guided liver biopsy, mesenteric-intrahepatic left portal vein shunts, balloon-occluded retrograde transvenous obliteration, transjugular intrahepatic portosystemic shunts and splenic embolization.

Infarcts and ischemia in the abdomen: an imaging perspective with an emphasis on cross-sectional imaging findings

Infarcts and ischemia of abdominal organs may present with acute abdominal pain, and early diagnosis is crucial to prevent morbidity and mortality. Unfortunately, some of these patients present in poor clinical conditions to the emergency department, and imaging specialists are crucial for optimal outcomes. Although the radiological diagnosis of abdominal infarcts is often straightforward, it is vital to use the appropriate imaging modalities and correct imaging techniques for their detection. Additionally, some non-infarct-related abdominal pathologies may mimic infarcts, cause diagnostic confusion, and result in delayed diagnosis or misdiagnosis. In this article, we aimed to outline the general imaging approach, present cross-sectional imaging findings of infarcts and ischemia in several abdominal organs, including but not limited to, liver, spleen, kidneys, adrenals, omentum, and intestinal segments with relevant vascular anatomy, discuss possible differential diagnoses and emphasize important clinical/radiological clues that may assist radiologists in the diagnostic process.

Proximal Splenic Artery Embolization for Refractory Ascites and Hydrothorax Post-Liver Transplant

PURPOSE

Proximal splenic artery embolization (pSAE) has been advocated as a valuable tool to ameliorate portal hyper-perfusion (PHP). The purpose of this study was to determine the safety and efficacy of pSAE to treat refractory ascites (RA) and/or refractory hydrothorax (RH) in the setting of PHP post-liver transplant.

MATERIAL AND METHODS

A total of 30 patients who underwent pSAE for RA and/or RH after liver transplantation (LT) between January 2007 and December 2017 were analyzed retrospectively. The patients were divided into groups according to the time frame from pSAE to clinical resolution in order to identify predictors of RA/RH response to the procedure.

RESULTS

Twenty-four (80%) patients responded to pSAE within three months, whereas 6 (20%) still required additional treatments for RA/RH at three months post-pSAE. In all cases clinical symptoms resolved within six months. Complications after pSAE were as follows: 2 cases of splenic infarction (6.6%), one case of post-splenic embolization syndrome (3.3%), one case of hepatic artery thrombosis (3.3%) and one case of portal vein (PV) thrombosis (3.3%). Increased intraoperative PV flow volume and increased pre-pSAE PV velocity, as well as higher estimated glomerular filtration rate were associated with early RA/RH resolution.

CONCLUSION

pSAE is safe and effective in treating RA and RH due to PHP after LT. This study suggests that clinical parameters indicating more severe PHP and better kidney function are possible predictors for early response to pSAE.

Long-Term Effects of Proximal Splenic Artery Embolization on Splenic Volume and Platelet Count

BACKGROUND

The spleen is the most commonly injured visceral organ in blunt abdominal trauma. Post-splenectomy infection risk has led to the shift toward spleen preserving procedures and splenic artery embolization (SAE) is now the treatment of choice for hemodynamically stable patients with splenic injury. This study aims to assess the long-term effect of SAE on splenic volume and platelet count.

MATERIALS AND METHODS

Using CPT codes, 66 patients who underwent SAE were identified, and 14 of those who had the necessary imaging and laboratory follow-up were included in the study. Indications for SAE were portal hypertension in 8 patients, bleeding in 4 patients, and thrombocytopenia in 1, and one patient had a separate indication. Splenic volume was calculated by automated volumetric software (Aquarius, TeraRecon, Inc.). Paired t-tests were performed to compare splenic volume and platelets before and after SAE.

RESULTS

Fourteen patients (7 males, 7 females) with a mean age of 51 ± 11.95 years underwent SAE and were followed by a repeat computed tomography scan at an average of 733.57 days. Nine SAEs were performed using vascular plugs, 3 using micro coils, and 2 out of that were with Gelfoam slurry, and 2 using coils only. All embolizations were technically successful with complete cessation of flow. Mean splenic volumes pre- and post-SAE were 903.5 ± 523.73 cm³ and 746.5 ± 511.95 cm³, respectively, representing a mean decrease of 8.31% compared to baseline [P = 0.346]. Minimum platelet counts (x10³) pre-SAE (within 3 months) and post-SAE (2 weeks to 3 months after the procedure) were 55.79 ± 57.11 and 116 ± 145.40, respectively. The minimum platelet count showed a statistically significant mean increase of 134.92% (P = 0.033).

CONCLUSIONS

The splenic volume is not altered significantly by SAE in the long term. Similarly, the platelet count is also not significantly altered at 3 months follow-up. This study, although small, suggests that SAE is a safe intervention that can preserve splenic volume and function in the long term.

Splenomegaly in patients with primary or secondary myelofibrosis who are candidates for allogeneic hematopoietic cell transplantation: a Position Paper on behalf of the Chronic Malignancies Working Party of the EBMT

Splenomegaly is a hallmark of myelofibrosis, a debilitating haematological malignancy for which the only curative option is allogeneic haematopoietic cell transplantation (HCT). Considerable splenic enlargement might be associated with a higher risk of delayed engraftment and graft failure, increased non-relapse mortality, and worse overall survival after HCT as compared with patients without significantly enlarged splenomegaly. Currently, there are no standardised guidelines to assist transplantation physicians in deciding optimal management of splenomegaly before HCT. Therefore, the aim of this Position Paper is to offer a shared position statement on this issue. An international group of haematologists, transplantation physicians, gastroenterologists, surgeons, radiotherapists, and radiologists with experience in the treatment of myelofibrosis contributed to this Position Paper. The key issues addressed by this group included the assessment, prevalence, and clinical significance of splenomegaly, and the need for a therapeutic intervention before HCT for the control of splenomegaly. Specific scenarios, including splanchnic vein thrombosis and COVID-19, are also discussed. All patients with myelofibrosis must have their spleen size assessed before allogeneic HCT. Myelofibrosis patients with splenomegaly measuring 5 cm and larger, particularly when exceeding 15 cm below the left costal margin, or with splenomegaly-related symptoms, could benefit from treatment with the aim of reducing the spleen size before HCT. In the absence of, or loss of, response, patients with increasing spleen size should be evaluated for second-line options, depending on availability, patient fitness, and centre experience. Splanchnic vein thrombosis is not an absolute contraindication for HCT, but a multidisciplinary approach is warranted. Finally, prevention and treatment of COVID-19 should adhere to standard recommendations for immunocompromised patients.

Thrombocytopenia and liver disease: pathophysiology and periprocedural management

Abnormal bleeding in patients with liver disease may result from elevated portal pressure and varix formation, reduced hepatic synthesis of coagulation proteins, qualitative platelet dysfunction, and/or thrombocytopenia. Major mechanisms of thrombocytopenia in liver disease include splenic sequestration and impaired platelet production due to reduced thrombopoietin production. Alcohol and certain viruses may induce marrow suppression. Immune thrombocytopenia (ITP) may co-occur in patients with liver disease, particularly those with autoimmune liver disease or chronic hepatitis C. Drugs used for the treatment of liver disease or its complications, such as interferon, immunosuppressants, and antibiotics, may cause thrombocytopenia. Periprocedural management of thrombocytopenia of liver disease depends on both individual patient characteristics and the bleeding risk of the procedure. Patients with a platelet count higher than or equal to 50 000/µL and those requiring low-risk procedures rarely require platelet-directed therapy. For those with a platelet count below 50 000/µL who require a high-risk procedure, platelet-directed therapy should be considered, especially if the patient has other risk factors for bleeding, such as abnormal bleeding with past hemostatic challenges. We often target a platelet count higher than or equal to 50 000/µL in such patients. If the procedure is elective, we prefer treatment with a thrombopoietin receptor agonist; if it is urgent, we use platelet transfusion. In high-risk patients who have an inadequate response to or are otherwise unable to receive these therapies, other strategies may be considered, such as a trial of empiric ITP therapy, spleen-directed therapy, or transjugular intrahepatic portosystemic shunt placement.

Efficacy and safety of heparin plus dexamethasone after partial splenic embolization for liver cirrhosis with massive splenomegaly

PURPOSE

The aim of this study was to investigate the efficacy and safety of the combination of low-molecular-weight heparin + dexamethasone after partial splenic embolization in cirrhotic patients with massive splenomegaly.

METHODS

This study included 116 patients with liver cirrhosis complicated with massive splenomegaly who underwent PSE in Union Hospital from January 2016 to December 2019, and they met the criteria. They were divided into two groups: PSE + Hep + Dex group (N = 54) and PSE group (N = 62). We conducted a retrospective study to analyze the efficacy and safety of the two groups of patients.

RESULTS

The volume of splenic embolization was 622.34 ± 157.06 cm³ in the PSE + Hep + DEX group and 587.62 ± 175.33 cm³ in the PSE group (P = 0.306). There was no statistically difference in the embolization rate of the spleen between the two groups (P = 0.573). WBC peaked 1 week after PSE and PLT peaked 1 month after PSE in both groups; it gradually decreased later, but was significantly higher than the preoperative level during the 12-month follow-up period. The incidences of abdominal pain (46.3% vs 66.1%, P = 0.039), fever (38.9% vs 75.8%, P < 0.001), PVT (1.9% vs 12.9%, P = 0.026), refractory ascites (5.6% vs 19.4%, P = 0.027) were lower in the PSE + Hep + DEX group than in the PSE group. The VAS score of abdominal pain in PSE group was higher than that in PSE + Hep + DEX group on postoperative days 2-8 (P < 0.05). Splenic abscess occurred in 1(1.6%) patient in the PSE group and none (0.0%) in the PSE + Hep + DEX group (P = 0.349).

CONCLUSIONS

The combined use of dexamethasone and low-molecular-weight heparin after PSE is a safe and effective treatment strategy that can significantly reduce the incidence of complications after PSE (such as post-embolization syndrome, PVT, refractory ascites).

Portal Interventions in the Setting of Venous Thrombosis or Occlusion

Portal vein thrombosis most commonly occurs as a complication of liver cirrhosis and can result in worsening symptoms of portal hypertension, which often can be challenging to treat with conventional decompression therapies. In addition, because complete portal vein thrombosis is associated with higher posttransplant morbidity and mortality, it is regarded as a relative contraindication to liver transplant. Often, the diagnosis of portal vein thrombosis is incidental; hence, imaging remains the mainstay for diagnosing this complication and is used to guide subsequent treatment. Although anticoagulation is the initial approach used to treat acute portal vein thrombosis, endovascular and/or surgical interventions may be necessary when there is concern for impending bowel ischemia. Treatment of chronic portal vein thrombosis is primarily aimed at alleviating the symptoms of portal hypertension and improving the chance of candidacy for liver transplant. Awareness of the portal venous anatomy to differentiate it from the periportal collaterals is key during recanalization of a chronically occluded portal vein. The authors provide an overview of the pathophysiology, acute and chronic imaging findings, and management of portal vein thrombosis, with a specific focus on endovascular management, as well as a summary of the current related literature. An invited commentary by Lopera and Yamaguchi is available online. ©RSNA, 2022.

Approach to persistent ascites after liver transplantation

Persistent ascites (PA) after liver transplantation (LT), commonly defined as ascites lasting more than 4 wk after LT, can be expected in up to 7% of patients. Despite being relatively rare, it is associated with worse clinical outcomes, including higher 1-year mortality. The cause of PA can be divided into vascular, hepatic, or extrahepatic. Vascular causes of PA include hepatic outflow and inflow obstructions, which are usually successfully treated. Regarding modifiable hepatic causes, recurrent hepatitis C and acute cellular rejection are the leading ones. Considering predictors for PA, the presence of ascites, refractory ascites, hepato-renal syndrome type 1, spontaneous bacterial peritonitis, hepatic encephalopathy, and prolonged ischemic time significantly influence the development of PA after LT. The initial approach to patients with PA should be to diagnose the treatable cause of PA. The stepwise approach in evaluating PA includes diagnostic paracentesis, ultrasound with Doppler, and an echocardiogram when a cardiac cause is suspected. Finally, a percutaneous or transjugular liver biopsy should be performed in cases where the diagnosis is unclear. PA of unknown cause should be treated with diuretics and paracentesis, while transjugular intrahepatic portosystemic shunt and splenic artery embolization are treatment methods in patients with refractory ascites after LT.

S, Agarwal A, Yadav RR. Emergent Management of Gastric Variceal Bleed in the Setting of Acute Pancreatitis-Related Sinistral Hypertension With Partial Splenic Embolization: A Series of Two Cases

Sinistral portal hypertension in the setting of acute pancreatitis is a known complication owing to splenic vein thrombosis. It can lead to upper gastrointestinal bleeding due to the development of fundal gastric varices due to the shunting of blood via short gastric veins. However, in the setting of acute pancreatitis, surgical procedures can have high post-operative morbidity. Emergent management of cases with absent gastro-renal shunt can be done by partial splenic arterial embolization, as it is minimally invasive and can provide similar results. Herein, we report a case series of two cases of acute pancreatitis complicated with splenic vein thrombosis and gastric varices, which were managed by partial splenic artery embolization.

Efficacy of interventional radiology in the management of portal hypertension: A narrative review

Portal hypertension is associated with numerous adverse effects, including the formation of gastroesophageal varices and a portal vein general circulation shunt. Portal hypertension can lead to portal blood flow into the liver and a subsequent reduction in liver function. Clinical interventions can be hampered by a concurrent reduction in circulating platelets associated with increased splenic activity. Pharmaceutical interventions for the treatment of complications associated with portal hypertension have achieved various degrees of success. However, an effective therapeutic strategy for portal hypertension has not yet been established. A literature search was performed using "PubMed." Database between 1966 and January 2021 using the following keywords: portal hypertension, interventional radiology, balloon-occluded retrograde transvenous obliteration, transjugular retrograde obliteration of gastric varices, percutaneous transhepatic obliteration, partial splenic embolization, and transjugular intrahepatic portosystemic shunting. In this narrative review, we summarize the application of interventional radiology in patients with portal hypertension, including techniques for embolization of collateral veins and portal pressure reduction. These up-to-date interventional radiology techniques can be used to treat portal hypertension. The data that support the findings of this study are available from the corresponding author, upon reasonable request.

Research on Portal Venous Hemodynamics and Influencing Factors of Portal Vein System Thrombosis for Wilson’s Disease after Splenectomy

Objective

Splenectomy is one crucial solution for hypersplenism with portal hypertension. However, portal vein system thrombosis (PVST) caused by hemodynamic changes affects the prognosis of patients. We analyze the changes in portal vein hemodynamics following splenectomy for Wilson’s disease combined with portal hypertension and the influencing factors that lead to PVST.

Methods

A retrospective cohort study was conducted, in which 237 Wilson’s disease patients with hypersplenism underwent splenectomy. The hemodynamic indices of the portal vein were monitored before surgery and on the 1st, 7th, and 14th days around surgery. The patients were divided into PVST and non-PVST groups. The clinical factors were identified by univariate and multivariate logistic regression. The Logit P was calculated according to the logistic regression prediction model, and the ROC curve for each independent factor was plotted.

Results

The portal vein velocity, flow, and inner diameter showed a downward trend around surgery, with statistically significant differences between each time point (P < 0.01). The PVST incidence rate was 55.7%. Univariate analysis revealed that the platelet (PLT) levels on the postoperative 3rd and 7th days (P = 0.001; P < 0.001), D-dimer (D-D) on the postoperative 7th and 14th days (P = 0.002; P < 0.001), preoperative portal vein velocity, flow, diameter (P < 0.001), and splenic vein diameter (P < 0.001) were all statistically and significantly different between the two groups. Multivariate logistic regression revealed a significant increase in PLT on the postoperative 7th day (OR = 1.043, 95% CI, 1.027–1.060, P < 0.001) and D-D on the postoperative 14th day (OR = 1.846, 95% CI, 1.400–2.435, P < 0.001). Preoperative portal and splenic vein diameters (OR = 1.565, 95% CI, 1.213–2.019, P = 0.001; OR = 1.671, 95% CI, 1.305–2.140, P < 0.001) were the risk factors for PVST. However, preoperative portal vein velocity and flow (OR = 0.578, 95% CI, 0.409–0.818, P = 0.002; OR = 0.987, 95% CI, 0.975–0.990, P = 0.046) were protective factors for PVST. Logit P was calculated using a logistic regression prediction model with a cut-off value of −0.32 and an area under receiver operating characteristic curve of 0.952 with 88.61% accuracy.

Conclusions

Splenectomy relieves portal hypertension by reducing the hemodynamics index. PVST is linked to multiple factors, including preoperative portal vein diameter, velocity, flow, and splenic vein diameter, especially PLT on the postoperative 7th day and D-D on the postoperative 14th day. The predictive model is accurate in predicting PVST.

Repeated partial splenic artery embolization for hypersplenism improves platelet count

Splenic embolization is a minimally invasive alternative to splenectomy for the treatment of hypersplenism. This was a retrospective study of 101 patients with hypersplenism caused by cirrhosis who were treated with splenic embolization and for whom 6 months of follow-up data were available. Of these patients, 65 underwent partial splenic artery embolization (PSE), including 23 who underwent repeated PSE (RPSE). The incidence of abdominal pain was significantly higher in the PSE group than in the total splenic artery embolization (TSE) group (P < 0.001), and its duration was also longer in the PSE group (P = 0.003). Biochemical markers of liver function were compared before and after the operation; aminotransferase indices decreased (alanine aminotransferase, aspartate aminotransferase, and alkaline phosphatase), total bilirubin increased slightly, and albumin and prealbumin decreased after the operation (all P < 0.001). Platelet (PLT) counts began to increase at 1 week postoperatively, peaked at 1 month postoperatively, and then decreased gradually. There was no significant intergroup (PSE and TSE) difference at any time point (1 day, 1 week, 1 month, and 6 months postoperatively, P > 0.05). There was a significant intergroup (PSE and RPSE) difference in the mean postoperative change in PLT count (P = 0.45). Splenic embolization can improve the inflammatory indicators of liver function. Performing PSE twice or more improves the PLT counts.

Successful Embolization of Spleen through Gastroepiploic Artery in a Liver Transplant Recipient with Splenic Artery Ligation

Partial splenic embolization (PSE) is a minimally invasive endovascular procedure for the treatment of hypersplenism. This procedure is normally done by catheterization of the splenic artery, which if ligated during surgery, makes the procedure very challenging. We present a case where the splenic artery had been ligated during liver transplant surgery, and the only major endovascular route to reach the spleen was through the hypertrophied tortuous gastroepiploic artery. Successful PSE in these patients suggests the feasibility of this procedure after splenic artery ligation and can thus help to spare a patient from the otherwise more invasive surgical splenectomy.

Avatrombopag: A Review in Thrombocytopenia

Avatrombopag (Doptelet^®) is an orally administered second generation thrombopoietin receptor agonist (TPO-RA) approved for the treatment of primary chronic immune thrombocytopenia (ITP) in adult patients who are refractory or have an unsatisfactory response to other treatments, as well as for the treatment of thrombocytopenia in adult patients with chronic liver disease (CLD) scheduled to undergo an invasive procedure. In phase III studies, avatrombopag was associated with a significantly greater platelet response than placebo in patients with chronic ITP, and was superior to placebo in reducing the requirement for platelet transfusion or rescue procedures for bleeding caused by surgery in patients with CLD with a platelet count < 50 × 10⁹/L at baseline. Longer term data indicate that avatrombopag is associated with high durable response rates in ITP and may have corticosteroid-sparing effects. The drug was generally well tolerated in both indications. Avatrombopag thus represents a convenient and effective second-line treatment for patients with chronic ITP and can prevent bleeding events in patients with CLD scheduled to undergo a procedure, offering a useful alternative to other available treatments in both indications.

Avatrombopag (Doptelet^®) is an orally administered drug that mimics the natural compound (thrombopoietin) responsible for stimulating the production of platelets, an essential component of the clotting process that prevents excessive bleeding. Several conditions can cause reduced platelet levels (thrombocytopenia) to the point that intervention is needed to prevent excessive blood loss. Avatrombopag is approved for the treatment of primary chronic immune thrombocytopenia (ITP) and to prevent bleeding caused by surgery in patients with low platelet levels caused by chronic liver disease (CLD). Clinical trials in patients with ITP show that avatrombopag quickly increases platelet levels and that this increase is maintained in the longer term in many patients. Similarly, clinical trials in patients with low platelet levels because of CLD showed that giving avatrombopag prior to surgery reduced the need for platelet transfusions or rescue procedures for bleeding. Avatrombopag is thus a convenient and effective treatment for patients with chronic ITP and can prevent bleeding events in patients with CLD scheduled to undergo a procedure. In both indications avatrombopag offers a useful alternative to other available treatments.

Quantitative splenic embolization possible: application of 8Spheres conformal microspheres in partial splenic embolization (PSE)

BACKGROUND

To investigate the safety and efficacy of 8Spheres in partial splenic embolization. To explore the possibility of accurate control of splenic embolic volume by quantifying the number of microspheres used during PSE.

METHOD

The data of 179 patients who underwent PSE were collected. The patients were divided into two groups: 300-500 um microsphere group (N = 83) and 500-700 um microsphere group (N = 96). The spleen volume before PSE, infarct volume and infarct rate of the spleen after PSE, changes in peripheral blood cells after PSE, postoperative adverse events and incidence of infection were compared between the two groups.

RESULTS

300-500 um group vs 500-700 um group: postoperative spleen volume (cm³): 753.82 ± 325.41 vs 568.65 ± 298.16 (P = 0.008); spleen embolization volume (cm³): 525.93 ± 118.29 vs 630.26 ± 109.71 (P = 0.014); spleen embolization rate: 41.1 ± 12.3% vs 52.4 ± 10.1% (P = 0.021). Leukocytes and platelets were significantly increased after PSE in both groups; leukocyte, 1 month: 4.13 ± 0.91 vs 5.08 ± 1.16 (P = 0.026); 3 months: 4.08 ± 1.25 vs 4.83 ± 0.98 (P = 0.022); platelet, 1 month: 125.6 ± 20.3 vs 138.7 ± 18.4 (P = 0.019); 3 months: 121.8 ± 16.9 vs 134.3 ± 20.1 (P = 0.017). Incidence of abdominal pain after PSE, 72 (86.7%) vs 69 (71.9%), P = 0.027. The incidence of other adverse events and infections after PSE was not statistically different.

CONCLUSION

PSE with 8Spheres is safe and effective. The use of 500-700 um microsphere for PSE can make the increase of peripheral blood cells more stable. Each vial of 8Spheres corresponds to a certain volume of splenic embolization, so it is possible to achieve quantitative embolization in PSE.

Thrombocytopenia in Chronic Liver Disease: Challenges and Treatment Strategies

Thrombocytopenia is a common hematologic complication seen in patients with chronic liver disease (CLD). The pathophysiology of thrombocytopenia in CLD is multifactorial, primarily stemming from platelet sequestration and decreased platelet production. This review focuses on the pathophysiology and current treatment options in the treatment of thrombocytopenia in chronic liver disease. While platelet transfusions are the gold standard of treatment, considerations ought to be given to CLD patients who can benefit from transjugular intrahepatic portosystemic shunt and splenic artery embolization. Finally, the recent approval of thrombopoietin receptor agonists for use in CLD patients paves a way for a safe and effective alternative method of improving platelet levels and reducing the need for recurrent platelet transfusions.

Splenic Artery Embolisation for the Emergency Treatment of Sinistral Portal Hypertension: A Systematic Review

Objectives Sinistral portal hypertension (SPH) is caused by increased pressure on the left portal system secondary to splenic vein stenosis or occlusion and may lead to gastric varices. The definitive management of SPH is splenectomy, but this is associated with significant mortality and morbidity in the acute setting. In this systematic review, we investigated the efficacy and safety of splenic artery embolisation (SAE) in managing refractory variceal bleeding in patients with SPH.

Methods A comprehensive literature search was conducted using MEDLINE and Embase databases. A qualitative analysis was chosen due to heterogeneity of the studies.

Results Our search yielded 339 articles, 278 of which were unique. After initial screening, 16 articles relevant to our search remained for full text review. Of these, 7 were included in the systematic review. All 7 papers were observational, 6 were retrospective. Between them they described 29 SAE procedures to control variceal bleeding. The technical success rate was 100% and there were no cases of rebleeding during follow up. The most common complication was post-embolisation syndrome. Four major complications occurred, two resulting in death. These deaths were the only 30-day mortalities recorded and were in patients with extensive comorbidities.

Conclusions Although there is a distinct lack of randomized controlled studies comparing SAE to other treatment modalities, it appears to be safe and effective in treating hemorrhage secondary to SPH.

Comparison of three embolic materials at partial splenic artery embolization for hypersplenism: clinical, laboratory, and radiological outcomes

Purpose

To compare effectiveness of three widely used embolic agents in partial splenic embolization (PSE) by analyzing their clinical, laboratory, and radiological outcomes within one year of follow-up.

Materials and methods

This retrospective study examined 179 patients who underwent PSE to manage hypersplenism secondary to cirrhosis. Patients were divided into 3 groups according to embolic agent used. Group 1 (gelatin sponge) included 65 patients, group 2 (embospheres) included 58 patients, and group 3 (PVA) included 56 patients. Clinical, laboratory, and radiological outcomes were compared between groups.

Results

The technical success rate was 100% in all groups. Pain as a major complication was lower in the gelatin sponge group (20%) compared to the embosphere group (31%) and PVA group (32.3%). Major complications other than pain were found in 20.1%; 24.6% in gelatin sponge group, 15.5% in embosphere group and 19.6% in PVA group (p = 0.045). WBCs and platelet counts showed a significant increase after PSE in all groups. Entire splenic volume as measured by computed tomography after PSE showed no significant difference among the 3 groups; however, the volume of infarcted spleen was significantly lower in the gelatin sponge group compared to other two groups (p = 0.001). The splenic span was significantly reduced one-year post-procedure in three groups (p = 0.006), and it was significantly less in embosphere and PVA groups compared to gelatin sponge group (p < 0.05). Recurrent bleeding was higher in gelatin sponge group (p < 0.05).

Conclusions

Permanent embolic materials achieved better laboratory and radiological outcomes than gelatin sponge particles in PSE of cirrhotic hypersplenism patients. However, permanent particles were associated with greater abdominal pain.

Noninvasive Management of Complications From Splenic Artery Aneurysm Embolization After Liver Transplant: A Case Report

Splenic artery aneurysms are more common in patients with cirrhosis than in the general population. We report the case of a patient with a history of an orthotopic liver transplant who developed an enlarging splenic artery aneurysm that was treated with splenic artery embolization. He developed extensive portal vein thrombosis and subsequently splenic abscess. Both complications were managed endovascularly, with catheter-directed thrombolysis and percutaneous drains. This case illustrates the possible complications after splenic artery embolization and demonstrates the nonsurgical options for treatment.

Splenic embolization in trauma: results of a survey from an international cohort

PURPOSE

A questionnaire regarding splenic embolization in trauma was submitted to an international sample of IR faculty members, to compare their practice to the available recommendations.

METHODS

A 21 multiple-choice questionnaire was sent to an international cohort of 96 IR faculty. Questions included the initial patient evaluation, embolization materials and techniques, post-procedure management, availability of an institutional protocol, and use of guidelines.

RESULTS

For each question, there were from a minimum of 45 to a maximum of 52 responders: 94% require a CT with contrast prior to embolization, and 87% use the American Association for the Surgery of Trauma (AAST) scale to grade the splenic injuries. Embolization is performed across all values of the AAST scale. Of the patients with injuries of grade III or greater, embolization is primarily done for those patients who are hemodynamically stable. Unstable patients are embolized less frequently and primarily in cases in which the injuries are of a lower grade. Coils are the preferred material for proximal embolization (69%). Particles/Gelfoam is the preferred material for distal embolization (38%). In total, 63% administer intravenous antibiotics before the procedure and 15% administer intra-arterial antibiotics during the procedure. After embolization, follow-up imaging is recommended by 87%, antibiotics are administered regularly by 33%, clinical follow-up is recommended by 73%, and vaccination against encapsulated organisms is routinely recommended by 39%.

CONCLUSIONS

There is significant variability among a heterogeneous cohort of respondents. Available recommendations may not be sufficiently addressing the practice of splenic embolization.

Splanchnic Vein Thrombosis in Liver Cirrhosis After Splenectomy or Splenic Artery Embolization: A Systematic Review and Meta-Analysis

INTRODUCTION

Splenectomy and splenic artery embolization are major treatment options for hypersplenism and portal hypertension in liver cirrhosis, but may lead to splanchnic vein thrombosis (SVT), which is potentially lethal. We conducted a systematic review and meta-analysis to explore the incidence of SVT in liver cirrhosis after splenectomy or splenic artery embolization and the risk factors for SVT.

METHODS

All relevant studies were searched through the PubMed, EMBASE, and Cochrane Library databases. The incidence of SVT in liver cirrhosis after splenectomy or splenic artery embolization was pooled. Odds ratios (ORs) with 95% confidence intervals (CIs) were calculated.

RESULTS

Sixty-six studies with 5632 patients with cirrhosis were included. The pooled incidence of SVT after splenectomy and splenic artery embolization was 24.6% (95% CI 20.2-29.3%) and 11.7% (95% CI 7.1-17.3%), respectively. A meta-analysis of three comparative studies demonstrated that the incidence of SVT after splenectomy was statistically similar to that after splenic artery embolization (OR 3.15, P = 0.290). Platelet count, mean platelet volume, preoperative splenic or portal vein diameter, preoperative or postoperative portal blood velocity, splenic volume and weight, and periesophagogastric devascularization were significant risk factors for SVT after splenectomy. Postoperative use of preventive antithrombotic therapy was a significant protective factor against SVT after splenectomy.

CONCLUSIONS

SVT is common in liver cirrhosis after splenectomy and splenic artery embolization. Coagulation and hemostasis factors, anatomical factors, and surgery-related factors have been widely identified for the assessment of high risk of SVT after splenectomy. Prophylactic strategy after splenectomy, such as antithrombotic therapy, might be considered in such high-risk patients.

STUDY REGISTRATION

This study was registered in PROSPERO with a registration number of CRD42019129673.

Partial splenic embolization combined with endoscopic therapies and NSBB decreases the variceal rebleeding rate in cirrhosis patients with hypersplenism: a multicenter randomized controlled trial

Background

Global research on endoscopic therapies in combination with partial splenic embolization (PSE) for variceal hemorrhage (VH) is limited. Therefore, we aimed to evaluate the efficacy and safety of endoscopy plus PSE (EP) treatment in comparison to endoscopic (E) treatment for the secondary prophylaxis of VH in cirrhosis patients with hypersplenism.

Methods

Cirrhosis patients with hypersplenism (platelet count < 100, 000/µL) and those who had recovered from an episode of VH were enrolled in a multicenter randomized controlled trial. The participants were randomly assigned into EP and E groups in a 1:1 ratio. The primary endpoint was variceal rebleeding, and the secondary endpoints were severe variceal recurrence and mortality during the 2-year follow-up. Hematological indices, serum biochemical parameters, and the Child–Pugh score were measured at each time point.

Results

From June 2016 to December 2019, 108 patients were enrolled in the study, among which 102 patients completed the protocol (51 in EP and 51 in E group). The rebleeding rate of the varices was significantly reduced in the EP group compared to that in the E group during the 2 years (16% vs. 31%, p < 0.001). The EP group showed a significantly lower variceal recurrence rate than the E group (22% vs. 67%, p < 0.001). The COX proportional hazard models revealed that grouping was an independent predictor for variceal rebleeding (H = 0.122, 95% CI 0.055–0.270, p < 0.001) and variceal recurrence (hazard ratio, H = 0.160, 95% CI 0.077–0.332, p < 0.001). The peripheral blood cell count, Child–Pugh class/score, albumin concentration, and coagulation function in the EP group improved significantly compared to the values observed in the E group at any time point (p < 0.05).

Conclusions

The EP treatment was more effective in preventing variceal rebleeding and variceal recurrence than the conventional E treatment during the secondary prophylaxis of VH in cirrhosis patients with hypersplenism. Furthermore, the EP treatment could significantly increase the peripheral blood cell count and albumin concentration and also improved the coagulation function and the Child–Pugh score.

Clinical trials registration

Trial registration number ClincialTrials.gov: NCT02778425. The URL of the clinical trial: https://clinicaltrials.gov/

Supplementary Information

The online version contains supplementary material available at 10.1007/s12072-021-10155-0.

Evaluation of perfusion changes using a 2D Parametric Parenchymal Blood Flow technique with automated vessel suppression following partial spleen embolization in patients with hypersplenism and portal hypertension

To evaluate the feasibility and potential value of 2D Parametric Parenchymal Blood Flow (2D-PPBF) for the assessment of perfusion changes following partial spleen embolization (PSE) in a retrospective observational study design.Overall, 12 PSE procedures in 12 patients were included in this study. The outcome of the study was the platelet response (PR), calculated as the percentage increase of platelet count (PLT), following PSE. To quantify perfusion changes using 2D-PPBF, the acquired digital subtraction angiography series were post-processed. A reference region-of-interest (ROI) was placed in the afferent splenic artery and a target ROI was positioned on the embolization territory of the spleen on digital subtraction angiography series pre- and post-embolization. The ratios of the target ROIs to the reference ROIs were calculated for the Wash-In-Rate (WIR), the Time-To-Peak (TTP) and the Area-Under-the-Curve (AUC). Comparisons between pre- and post-embolization data were made using Wilcoxon signed-rank test and Spearman's rank correlation coefficient (r). Afterwards, the study population was divided by the median of the TTP before PSE to analyze its value for the prediction of PR following PSE.Following PSE, PLT increased significantly from 43,000 ± 21,405 platelets/μL to 128,500 ± 66,083 platelets/μL with a PR of 255 ± 243% (P = .003). In the embolized splenic territory, the pre-/post-embolization 2D-PPBF parameter changed significantly: WIRpre-PSE 1.23 ± 2.42/WIRpost-PSE 0.09 ± 0.07; -64 ± 46% (p = 0.04), TTPpre-PSE 4.41 ± 0.99/TTPpost-PSE 5.67 ± 1.52 (P = .041); +34 ± 47% and AUCpost-PSE 0.81 ± 0.85/AUCpost-PSE 0.14 ± 0.08; -71 ± 18% (P = .002). A significant correlation of a 2D-PPBF parameter with the PLT was found for TTPpre-PSE/PLTpre-PSE r = -0.66 (P = .01). Subgroup analysis showed a significantly increased PR for the group with TTPpre-PSE >4.44 compared to the group with TTPpre-PSE ≤4.44 (404 ± 267% versus 107 ± 76%; P = .04).2D-PPBF is an objective approach to analyze the perfusion reduction of embolized splenic tissue. TTP derived from 2D-PPBF has the potential to predict the extent of PR during PSE.

Lusutrombopag Is Safe and Efficacious for Treatment of Thrombocytopenia in Patients With and Without Hepatocellular Carcinoma

BACKGROUND & AIMS

Patients with hepatocellular carcinoma (HCC) secondary to chronic liver disease often require invasive procedures but frequently have thrombocytopenia. Lusutrombopag is an agonist of the thrombopoietin receptor that activates platelet production.

METHODS

We performed an integrated analysis of data from 2 phase 3 trials (L-PLUS 1, Japan, October 2013 to May 2014, and L-PLUS 2, global, June 2015 to April 2017) that compared the efficacy and safety of lusutrombopag with placebo in patients with chronic liver disease, with and without HCC. Our analysis included patients with Eastern Cooperative Oncology Group grades of 0 or 1, Child-Pugh classes A or B, and a platelet count less than 50 × 10⁹/L who were scheduled to undergo invasive procedures in 9 to 14 days. Patients received lusutrombopag (3 mg) or placebo daily for 7 days or fewer before an invasive procedure. Imaging studies assessed treatment-emergent adverse events, including asymptomatic portal vein thrombosis. The primary end point was no requirement for platelet transfusion before the invasive procedure and rescue therapies for bleeding 7 days or fewer after the invasive procedure.

RESULTS

The per-protocol population included 270 patients (95 with HCC). A significantly higher proportion of patients with HCC who received lusutrombopag achieved the primary end point (68.0%) vs patients who received placebo (8.9%) (P < .0001); in patients without HCC, these proportions were 77.0% vs 21.6% (P < .0001). Lusutrombopag reduced the need for platelet transfusions, increased platelet counts for 3 weeks, and reduced the number of bleeding events in patients with and without HCC compared with placebo. Risk of thrombosis was similar to that of placebo.

CONCLUSIONS

Patients with and without HCC receiving lusutrombopag had a reduction in the number of platelet transfusions before invasive procedures compared with patients receiving placebo, with no increase in thrombosis or bleeding. L-PLUS 1: JapicCTI-132323; L-PLUS 2: ClinicalTrials.gov number no: NCT02389621.

Contemporary endovascular management of splenic vascular pathologies

The spleen is a commonly injured organ and the splenic vasculature is also susceptible to inflammation and trauma, often resulting in aneurysm formation. Splenic artery aneurysms carry a high risk of rupture and are associated with high mortality and morbidity. Due to the advances in endovascular techniques and devices, endovascular management of splenic vascular pathologies is now considered a first-line strategy. Endovascular embolisation and advance techniques including balloon- or stent-assisted coil embolisation enables minimally invasive management option while preserving splenic function.

Treatment Options for Thrombocytopenia in Patients With Chronic Liver Disease Undergoing a Scheduled Procedure

Thrombocytopenia is a consequence of portal hypertension and is the most common hematological manifestation of chronic liver disease (CLD) (ie, cirrhosis). Data indicates the rates of CLD are increasing and, as a result, so will the incidence of this complication. Although bleeding risks are only relevant when elective procedures are performed, this is a frequent concern as these procedures are commonly part of the spectrum of care for patients with cirrhosis. As such, thrombocytopenia remains a pertinent issue. Fortunately, we now have effective and accurate treatment modalities to raise platelet counts before scheduled procedures, known as thrombopoietin receptor agonists. Two drugs in this therapeutic class (avatrombopag and lusutrombopag) are now approved for the treatment of thrombocytopenia in adults with CLD undergoing a procedure and have revolutionized how this is managed. Although there is progress in the field, peer-reviewed literature and expert guidance are lacking. Recognizing these unmet needs, a group of expert hepatologists comprised this review, which summarizes the most current and relevant peer-reviewed literature on thrombocytopenia in CLD and provides clinical expertise on this timely topic.

Modern management of splenomegaly in patients with myelofibrosis

Myelofibrosis (MF) is a chronic myeloproliferative neoplasm which can lead to massive splenomegaly secondary to extramedullary hematopoiesis. Patients frequently exhibit debilitating symptoms including pain and early satiety, in addition to cellular sequestration causing severe cytopenias. JAK 1/2 inhibitors, such as ruxolitinib and fedratinib, are the mainstay of therapy and produce significant and durable reductions in spleen volume. However, many patients are not eligible for JAK 2 inhibitor therapy or become refractory to treatment over time. Novel therapies are in development that can reduce the degree of splenomegaly for some of these patients. However, splenectomy, splenic irradiation, and partial splenic artery embolization remain valuable therapeutic options in select patients. In this review, we will discuss currently available pharmacologic therapies and describe promising drugs currently in development. We will also delve into the efficacy and safety concerns of splenectomy, splenic irradiation, and partial splenic artery embolization. Finally, we will propose a treatment algorithm to help guide clinicians in the management of symptomatic splenomegaly in patients with MF.

Severe Complications After Splenic Artery Embolization for Portal Hypertension Due to Hepatic Cirrhosis

Background

Splenomegaly/hypersplenism is one of the most common complications of portal hypertension. Splenic artery embolization (SAE) has been increasingly used for treatment of splenomegaly/hypersplenism. However, few studies focused on the severe complications after embolization. In this paper, we reported 16 cases of severe complications after SAE for portal hypertension.

Methods

From February 2011 to January 2019, 16 cirrhotic patients were diagnosed with severe complications after embolization. The clinical symptoms, therapies and prognosis were analyzed.

Results

In these patients, the splenic embolization volume was between 50% and 70%. Among 16 cases, 7 patients were diagnosed with splenic abscess and/or left subphrenic abscess, suffered from the insistent fever, and eventually underwent the surgical therapy; 6 patients with left refractory pleural effusion, suffered from severe chest distress, and underwent repeated thoracocentesis or thoracic closed drainage; 3 patients with thrombosis in portal vein needed oral warfarin therapy.

Conclusion

In cirrhotic patients, the severe complications after SAE are not uncommon after the procedure. It causes more suffering, prolonged hospital stay and more medical cost in these patients. It was debatable whether this technique was an appropriate technique for portal hypertension due to liver cirrhosis, patients contraindicated for the treatment should be carefully identified to avoid the complications.