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Updated: Jun 22, 2026

Endoscopic Injection Sclerotherapy Assisted by Cyanoacrylate and Clips for Gastroesophageal Varices
Published on: June 13, 2025
1Department of Dermatology, St Vincent's Hospital, Sydney, Australia. kparsi@ozemail.com.au
This article reviews catheter-directed sclerotherapy as a treatment for venous conditions like saphenous incompetence and venous malformations. The procedure uses a catheter to deliver a sclerosing agent into target veins under ultrasound guidance. It was developed to improve the safety and success rate of standard ultrasound-guided methods. Foam sclerosants and tumescent anaesthesia have increased primary success rates. Catheter-directed methods are safer than standard procedures, with no risk of arterial injection or extravasation. Compared to laser and radiofrequency ablation, catheter-directed sclerotherapy is quicker and less painful. However, some balloon catheters may cause unintended vein occlusion. The evidence does not yet support firm conclusions about its superiority over newer ablation techniques. The procedure remains a safe alternative for treating venous issues.
Area of Science:
Background:
Current treatments for venous insufficiency include various minimally invasive options. Ultrasound-guided sclerotherapy has been widely used, but concerns remain about its safety profile. No prior work had resolved how to optimize delivery of sclerosing agents while minimizing complications. Prior research has shown that foam sclerosants and tumescent anaesthesia improve outcomes. However, the risk of intra-arterial injection remains a concern in standard procedures. This gap motivated the development of catheter-directed techniques. That uncertainty drove comparisons with newer technologies like laser and radiofrequency ablation. No prior work had resolved whether these newer methods offer better safety or efficacy than catheter-directed approaches.
Purpose Of The Study:
This review aimed to evaluate the role of catheter-directed sclerotherapy in treating venous conditions. The specific problem addressed is the need for safer and more effective alternatives to standard ultrasound-guided methods. The motivation stems from the limitations of existing techniques, including risks of extravasation and arterial injection. The study sought to synthesize evidence on the safety and efficacy of catheter-directed approaches. It focused on comparing outcomes with endovenous laser and radiofrequency ablation. The goal was to determine whether catheter-directed methods offer advantages in terms of speed and pain reduction. The authors also aimed to assess the current level of evidence supporting these procedures. This review provides a comprehensive overview of historical developments and current practices.
Main Methods:
The authors conducted a literature review to examine the history and evolution of catheter-directed sclerotherapy. They analyzed current techniques and devices used in the procedure. The review included comparisons with other treatment modalities like endovenous laser ablation. Evidence was synthesized from published studies on safety and efficacy outcomes. The authors evaluated the impact of foam sclerosants and tumescent anaesthesia on success rates. They also considered the role of balloon catheters in directing the sclerosing agent. The review approach involved assessing the risk profile of catheter-directed methods. The synthesis focused on identifying gaps in the evidence base for these procedures.
Main Results:
Catheter-directed sclerotherapy offers a safer alternative to standard ultrasound-guided procedures. The primary success rate is higher when using foam sclerosants and tumescent anaesthesia. The risk of intra-arterial injection is virtually eliminated with catheter-directed methods. Compared to endovenous laser ablation, catheter-directed procedures are quicker and less painful. Some balloon catheters may inadvertently cause femoral vein occlusion via perforators. The evidence does not yet support firm conclusions about efficacy compared to laser ablation. The procedure allows single-access delivery of sclerosing agents into target vessels. No definitive data currently compare catheter-directed methods with radiofrequency ablation.
Conclusions:
The authors propose that catheter-directed sclerotherapy remains a viable treatment option. They suggest that the procedure offers a safer profile than standard ultrasound-guided methods. The review highlights the need for further studies comparing outcomes with newer technologies. The authors note that catheter-directed methods may offer advantages in terms of procedural time and pain. However, no firm conclusions can be drawn about superiority over laser or radiofrequency ablation. The evidence supports the use of catheter-directed techniques for saphenous incompetence. The procedure's historical precedence and safety record make it a valuable alternative. The authors emphasize the importance of continued research to clarify its role in treatment algorithms.
The primary advantage is a safer profile with virtually no risk of intra-arterial injection or sclerosant extravasation.
The use of foam sclerosants and tumescent anaesthesia is associated with a higher primary success rate in catheter-directed sclerotherapy.
A single access point ensures intraluminal delivery of the sclerosing agent into the saphenous vein trunk, reducing procedural risks.
Balloon catheters can direct the sclerosing agent but may inadvertently cause femoral vein occlusion via perforators.
Catheter-directed sclerotherapy is a quicker procedure with less associated pain compared to endovenous laser ablation.
The evidence does not support firm conclusions about efficacy comparisons with radiofrequency ablation.