Thromboembolic Events Secondary to Endoscopic Cyanoacrylate Injection: Can We Foresee Any Red Flags?

Pulmonary Embolization After Gastric Varices Obliteration

N-butyl-2-cyanoacrylate (NB2CYA) is frequently used in the treatment of variceal hemorrhage with a success rate in hemostatic control of 87%-100%. Although rare, complications include esophageal perforation, infection, or arterial and venous embolization. We present the case of a 67-year-old male with chronic ethanolic liver disease hospitalized due to melena and hematemesis. He had anemia requiring transfusion support, octreotide, and pantoprazole infusion. Upper digestive endoscopy was performed showing gastric varices with a hemorrhagic rupture point treated with cyanoacrylate. The patient developed respiratory failure over the next 48 hours with chest computed tomography (CT) angiography showing several dense, scattered linear images, with arterial vascular trajectories suggestive of cyanoacrylate embolization. It was decided to provide ventilatory support with invasive mechanical ventilation, initiate systemic corticosteroid therapy, and transfer the patient to the intensive care unit (ICU). The patient was ventilated for 11 days with initial favorable evolution, but after two episodes of decompensation of his chronic liver disease (CLD) (hepatic encephalopathy and hepatorenal syndrome) and a new nosocomial pneumonia, he ended up dying. The present case illustrates a rare but potentially fatal complication associated with cyanoacrylate, highlighting the importance of a high suspicion index in cases of respiratory failure and dyspnea after this therapy.

Endoscopic Advances in Hepatology

Endoscopy is and remains an indispensable tool in diagnosing and managing liver disease and its complications. Due to the progress in advanced endoscopy, endoscopy has become an alternative route for many surgical, percutaneous, and angiographic interventions, not only as a backup tool when conventional interventions fail but increasingly as a first-line choice. The term endo-hepatology refers to the integration of advanced endoscopy in the practice of hepatology. Endoscopy is key in the diagnosis and management of esophageal and gastric varices, portal hypertensive gastropathy, and gastric antral vascular ectasia. Endoscopic ultrasound (EUS) can be used for the evaluation of the liver parenchyma, liver lesions, and surrounding tissues and vessels, including targeted biopsy and complemented with new software functions. Moreover, EUS can guide portal pressure gradient measurement, and assess and help manage complications of portal hypertension. It is crucial that each present-day hepatologist is aware of the (rapidly increasing) full spectrum of diagnostic and therapeutic tools that exist within this field. In this comprehensive review, we would like to discuss the current endo-hepatology spectrum, as well as future directions for endoscopy in hepatology.

Comparing large-volume band ligators and cyanoacrylate injection for gastric variceal eradication: A prospective study

BACKGROUND

The role of endoscopy in the ligation of gastric varices (GV) remains controversial. This study aimed to evaluate the efficacy of endoscopic band ligation (EBL) using large-volume ligators for the management of non-bleeding GV in patients with cirrhosis.

METHODS

One hundred fifty-eight patients with non-bleeding GV due to cirrhosis were divided randomly into 2 groups: the EBL group and the endoscopic variceal obturation (EVO) group. The EBL group underwent EBL with large-volume ligators and the EVO group underwent tissue glue injection for the treatment of GV. Follow-up endoscopy was performed 3 to 4 weeks after endoscopic treatment. Patients were followed up for ≥6 months after treatment. Eradication, complication, and recurrence rates were evaluated and compared between groups.

RESULTS

The type and size of GV were similar in both groups. No significant difference was found in the mean number of treatment sessions or eradication and recurrence rates after 6 months. Ulcer bleeding occurred in 2 EBL patients (2.50%) after ligation, whereas 8 EVO patients (10.25%) experienced bleeding due to glue extrusion. The bleeding rate after endoscopic treatment significantly differed between the groups. In the EVO group, 1 patient developed renal embolism after injection and 2 patients developed sepsis. The prevalence of postoperative fever was significantly higher in the EVO group than in the EBL group.

CONCLUSION SUBSECTIONS

Large-volume band ligators have similar efficacy to tissue glue for eradicating GV, however, the former is safer. Nevertheless, multicenter studies are needed to further confirm these results.

Endoscopic tissue adhesive injection for gastric varices secondary to hepatic cirrhosis: Complications and management strategies

Gastric varices is a common clinical presentation of portal hypertension induced by hepatic cirrhosis, and gastric variceal bleeding is an emergency with high mortality. Endoscopic tissue adhesive injection plays an important role in the primary and secondary prophylaxis of gastric variceal bleeding, and acute bleeding control. However, this is a technique-demanding operation with nonnegligible complications, of which some may be fatal, such as ectopic embolism. Therefore, the prevention and treatment of such complications are of great importance. Herein, we present a review summarizing the complications and treatment strategies of endoscopic tissue adhesive injection for gastric varices secondary to hepatic cirrhosis.

Practice patterns in endoscopic treatment for gastric varices: A Chinese survey

OBJECTIVES

Gastric varices (GV), a common complication of liver cirrhosis, often cause serious consequences. However, the management of GV remains debated. In this study we aimed to explore the practice patterns of Chinese practitioners in GV treatment and discuss whether these patterns conform to the guidelines in China and around the world.

METHODS

Between October 2020 and January 2021, an online questionnaire was sent to doctors from different regions in China via WeChat. Data on the practice patterns for endoscopic treatment with and without a multidisciplinary discussion team (MDT) clinic for GV were analyzed.

RESULTS

Questionnaires were collected from 241 practitioners from 29 provinces in China. Before endoscopic treatment, 100 (41.5%) of the practitioners arranged computed tomography angiography (CTA) examination. In endoscopic tissue adhesive (ETA) treatment, 183 (75.9%) of the practitioners chose ETA combined with lauromacrogol. Approximately one-fourth of all practitioners did not prescribe drugs to reduce portal pressure. Only 75 (31.1%) of physicians preferred using early transjugular intrahepatic portosystemic shunt (TIPS) for patients at a high risk of treatment failure for GV. Compared to those without MDT clinics, practitioners with MDT clinics more often chose early TIPS for high-risk patients (39.0% vs 18.9%, P = 0.001).

CONCLUSIONS

Treatment for GV differ across China. Practitioners with MDT clinics can better use assistant strategies such as CTA to evaluate the risk and efficacy. Further clinical studies are needed, and more guidelines and consensuses are warranted to standardize clinical practice for GV.

Two-step complete splenic artery embolization for the management of symptomatic sinistral portal hypertension

BACKGROUND

Sinistral portal hypertension (SPH) is a rare clinical syndrome. The purpose of this study was to assess the clinical outcomes and safety of splenic artery embolization (SAE) in the treatment of SPH.

METHODS

This retrospective study included 39 SPH patients who underwent SAE treatment between August 2009 and May 2021. The cases had esophageal, gastric, or ectopic varices detected by endoscopy or enhanced CT, with symptoms or signs of upper gastrointestinal (GI) bleeding and/or postprandial fullness. Clinical symptom improvement rate, complications, and symptomatic recurrence rate were observed and analyzed after treatment.

RESULTS

All the procedures were performed successfully. Of all patients, 17 received the 2-step complete SAE procedure, 19 received only the first step of the 2-step protocol (i.e., partial splenic embolization [PSE] procedure), and the remaining three received the 1-step complete SAE procedure. After the procedures, the symptoms completely disappeared in all patients, and the main complications were post-embolization syndromes, with 27 patients (69.2%) developing a low-grade fever, 24 (61.5%) developing abdominal pain and 4 (10.3%) developing nausea or mild vomiting. During the prolonged follow-up, varicose veins were gradually reduced as detected by enhanced CT; liver function parameters and platelet count remained in the normal range. Only one patient who underwent PSE treatment developed upper GI rebleeding 7 months after the procedure.

CONCLUSION

Two-step complete SAE is a safe and feasible procedure for the treatment of symptomatic SPH.

Complications and management of elective endoscopic cyanoacrylate injection with lauromacrogol for gastric varices

OBJECTIVE

To report the complications and evaluate the risk factors of elective endoscopic cyanoacrylate injection with lauromacrogol for gastric varices in cirrhotic patients.

METHODS

A total of 583 elective endoscopic tissue adhesives procedures were performed in 439 patients in our hospital from January 2015 to December 2016. The clinical characteristics and complications were retrospectively collected and evaluated.

RESULTS

The median age was 56 ± 11 years, and 290 (66.1%) patients were male. The main etiology of liver cirrhosis was hepatitis virus (63.3%). Two hundred fifty-nine (59.0%) patients were classified as Child-Pugh Class A. Bleeding occurred in 44 patients (7.5%) during procedures. Two patients developed distant embolism (0.5%; one pulmonary, one cerebra). In perioperative period, fever was a common complication; however, only 16 cases had high fever and one case had sepsis. Bleeding was observed in 7 (1.2%) patients. Overall incidence of the major perioperative complication was 3.8%. The major postoperative complication rate was 10.4% (60/582, 26 rebleeds, 27 ascites increase, 12 new-onset portal vein thrombosis). The complication-related death was 1.6% (one death from embolism, five deaths from rebleeding, one death from refractory ascites). Injection point was the only factor related to the major perioperative complications [odds ratio (OR) = 1.581, 95% CI, 1.086-2.301; P < 0.05]. Etiology of cirrhosis and injection point were independent risk factors of major postoperative complications (OR = 1.830, 95% CI, 1.005-3.331, P = 0.048; OR = 1.373, 95% CI, 1.089-1.731, P = 0.007).

CONCLUSION

The incidence of complications after elective endoscopic cyanoacrylate injection with lauromacrogol for gastric varices was low. The injection point was the risk factor for both perioperative and postoperative complications.

Cyanoacrylate closure for peripheral veins: Consensus document of the Australasian College of Phlebology

Background

Cyanoacrylates are fast-acting adhesives used in procedural medicine including closure of superficial wounds, embolization of truncal vessels pre-operatively, vascular anomalies, visceral false aneurysms, endoleaks, gastrointestinal varices and gastrointestinal bleeding. More recently, catheter-directed cyanoacrylate adhesive closure was introduced as an alternative to endovenous thermal ablation (ETA) to occlude superficial veins of the lower limbs.

Objectives

To formulate policies for the safe and effective delivery of cyanoacrylate adhesive closure procedures in Australasia, based on current experience and evidence.

Methods

A panel of phlebologists including vascular surgeons, interventional radiologists, dermatologists and research scientists systematically reviewed the available data on cyanoacrylate products used in medicine and shared personal experience with the procedure. The reviewed material included bibliographic and biomedical data, material safety data sheets and data requested and received from manufacturers. Results and recommendations: Cyanoacrylate adhesive closure appears to be an effective treatment for saphenous reflux with occlusion rates at 36 months of 90–95%. We recommend a maximum dose of 10 mL of cyanoacrylate per treatment session. Serious complications are rare, but significant. Hypersensitivity to acrylates is reported in 2.4% of the population and is an important absolute contraindication to cyanoacrylate adhesive closure. 1 Post-procedural inflammatory reactions, including hypersensitivity-type phlebitis, occur in 10–20% of patients. 2 In the long term, cyanoacrylate adhesive closure results in foreign-body granuloma formation within 2–12 months of the procedure. We recommend against the use of cyanoacrylate adhesive closure in patients with uncontrolled inflammatory, autoimmune or granulomatous disorders (e.g. sarcoidosis). Caution should be exercised in patients with significant active systemic disease or infection and alternative therapies such as thermal ablation and foam sclerotherapy should be considered.

Conclusions

Cyanoacrylate adhesive closure appears to be an effective endovenous procedure, with short-term closure rates comparable to ETA and therefore greater efficacy than traditional surgery for treating superficial veins of the lower limbs. Ongoing data collection is required to establish the long-term safety.