title: Catheter-directed sclerotherapy.
abstract: BACKGROUND
  Catheter directed sclerotherapy (CDS) involves the use of a long catheter to deliver a sclerosing agent into a target vessel (saphenous trunks or venous malformations) under ultrasound guidance. Aims and Methods This article reviews the history, current techniques and devices and the evidence as it relates to these procedures.
  
  
  RESULTS
  CDS was developed to increase the safety and efficacy of ultrasound-guided sclerotherapy (UGS). With the advent of foam sclerosants and tumescent anaesthesia, the procedure has enjoyed a higher primary success rate. CDS has a better safety profile when compared with UGS with virtually no risk of intra-arterial injection or sclerosant extravasation. Compared with endovenous laser (EVLA) and radiofrequency ablation (RFA), CDS is a quicker procedure with less associated pain. Some balloon catheters, however, have been found to force the sclerosant down the perforators causing femoral vein occlusion. Based on the current level of evidence, no firm conclusion regarding the efficacy of CDS techniques can be drawn in comparison with EVLA or RFA, but the primary success rate is probably higher than the standard UGS.
  
  
  CONCLUSIONS
  CDS ensures a safe intraluminal delivery of the sclerosing agent into the trunk of the saphenous veins using a single access point. This procedure preceded EVLA and RFA, and remains a safe alternative for the treatment of saphenous incompetence and venous malformations.
authors.affiliation: Department of Dermatology, St Vincent's Hospital, Sydney, Australia. kparsi@ozemail.com.au
authors.forename: K
authors.initials: K
authors.lastname: Parsi
mesh_terms: D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D015911:Sclerotherapy / Q000266:history* / Q000379:methods; D014463:Ultrasonography / Q000266:history* / Q000379:methods; D014648:Varicose Veins / Q000000981:diagnostic imaging / Q000266:history* / Q000628:therapy