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Salerno M, Bissacco D, Chi YW, Narayanan S, Addis A, Dellavia C, Canciani E, Righini PC, Nano G, Gianesini S. Empty vein ablation (EVA) technique: an in-vivo animal model to assess the effects of sclerosing agent concentration and wall contact time on intima and media tunicae structure. INT ANGIOL 2024; 43:223-228. [PMID: 38512703 DOI: 10.23736/s0392-9590.24.05147-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
BACKGROUND Sclerotherapy is a cornerstone of the treatment of chronic venous disease, despite some technical aspects (e.g., sclerosant liquid agent concentration [SLAC] and contact time between sclerosant agent and vein wall [ctSA/VW]) to maximize outcomes remain an unsolved problem and a source of debate. An innovative three-balloon catheter has been developed to allow sclerotherapy in empty vein conditions (Empty Vein Ablation technique, EVA), revolutionizing the definition of SLAC and ctSA/VW. Aim of this experimental study is to analyze EVA effects on intima and media vessel tunicae using different SLAC and ctSA/VW in an in-vivo animal model. METHODS Two adult sheep were treated by EVA using jugular and common iliac vein axes (eight vein segments). Different SLAC (polidocanol 0.5% or 1%) and different ctSA/VW (3 or 5 minutes) were combined for testing residual circumferential intima percentage and media thickness after EVA. RESULTS Intact circumferential residual intima after the treatment was 21.3±4.9%, 18.2±7.4%, 15.7±2.4% and 8.9±2.0% using 0.5% (3 min), 0.5% (5 min), 1% (3 min) and 1% (5 min), respectively (R2=0.945; control sample: 97.6%). Media thickness after the treatment was 121.6±35.3 µm, 110.9±7.8 µm, 96.1±30.4 µm and 79.1±34.1 µm using 0.5% (3 min), 0.5% (5 min), 1% (3 min) and 1% (5 min), respectively (R2=0.990; control sample 125.7 µm). No significant modifications were detected analyzing the adventitia in all samples. CONCLUSIONS EVA proved to be effective in venous wall destruction even with a very low SLAC and ctSA/VW (0.5% in 3 minutes), in quite large caliber veins. Direct comparisons with foam/liquid sclerotherapy should be done to confirm therapeutic effectiveness of these results, despite EVA has provided a maximized and controlled SA/VW contact time and ratio.
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Affiliation(s)
- Mario Salerno
- Unit of Angiology, Department of Medicine and Cardiopulmonary Rehabilitation, Istituti Clinici Scientifici Maugeri IRCCS, Institute of Tradate, Varese, Italy
- I-VASC S.r.l, Milan, Italy
| | - Daniele Bissacco
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy -
| | - Yung-Wei Chi
- Vascular Center, University of California, Sacramento, CA, USA
| | | | - Alessandro Addis
- CRABCC, Biotechnology Research Center for Cardiothoracic Applications, Rivolta D'Adda, Cremona, Italy
| | - Claudia Dellavia
- Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy
| | - Elena Canciani
- Department of Health Sciences "Amedeo Avogadro", University of Eastern Piedmont, Vercelli, Italy
| | - Paolo C Righini
- Operative Unit of Vascular Surgery, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
| | - Giovanni Nano
- Operative Unit of Vascular Surgery, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | - Sergio Gianesini
- Department of Translational Medicine, University of Ferrara, Ferrara, Italy
- Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
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Ma J, Chen Y, Zhang K, Yang T, Xie H, Yang X, Ding P. Study of vascular sclerosing agent based on the dual mechanism of vascular endothelial cell damage-plasmin system inhibition. Biochem Biophys Res Commun 2023; 680:135-140. [PMID: 37738903 DOI: 10.1016/j.bbrc.2023.09.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/05/2023] [Accepted: 09/14/2023] [Indexed: 09/24/2023]
Abstract
Venous malformations are a vascular disorder. Currently, the use of chemical sclerosing agents is a common clinical approach for the treatment of venous malformations. However, the effectiveness of existing sclerosing agents is unsatisfactory and often accompanied by severe side effects. In this study, we have developed a novel cationic surfactant-based sclerosing agent (POL-TA) by conjugating the plasmin inhibitor tranexamic acid (TA) with a nonionic surfactant polidocanol (POL) through an ester bond. POL-TA induces endothelial cell damage, triggering the coagulation cascade and thrombus formation. Moreover, it releases TA in vivo, which inhibits plasmin activity and the activation of matrix metalloproteinase (MMPs), thereby stabilizing the fibrin network of the thrombus and promoting vascular fibrosis. We have established a cell model using venous malformation endothelial cells and assessed the cellular damage and underlying mechanisms of POL-TA. The inhibitory effects of POL-TA on the plasmin-MMPs system were evaluated using MMP-9 activity assay kit. Additionally, the mice tail vein model was employed to investigate the vascular sclerosing effects and mechanisms of POL-TA.
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Affiliation(s)
- Jizhuang Ma
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, 110016, China; College of Pharmacy, Shenzhen Technology University, Shenzhen, 518118, China
| | - Yongfeng Chen
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, 110016, China; College of Pharmacy, Shenzhen Technology University, Shenzhen, 518118, China
| | - Keda Zhang
- College of Pharmacy, Shenzhen Technology University, Shenzhen, 518118, China
| | - Tianzhi Yang
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, Husson University, Bangor, ME, USA
| | - Huichao Xie
- College of Pharmacy, Shenzhen Technology University, Shenzhen, 518118, China.
| | - Xinggang Yang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, 110016, China.
| | - Pingtian Ding
- College of Pharmacy, Shenzhen Technology University, Shenzhen, 518118, China.
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Bontinis V, Bontinis A, Koutsoumpelis A, Claridge M, Chorti A, Rafailidis V, Giannopoulos A, Ktenidis K. Interventions For the Treatment of Lower Limb Telangiectasias and Reticular Veins: A Systematic Review and Network Meta-Analysis. Eur J Vasc Endovasc Surg 2023; 66:560-576. [PMID: 37209995 DOI: 10.1016/j.ejvs.2023.05.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 04/23/2023] [Accepted: 05/15/2023] [Indexed: 05/22/2023]
Abstract
OBJECTIVE To assess the safety and efficacy of available interventions in the treatment of lower limb reticular veins and telangiectasias. DATA SOURCES An electronic search was performed on Scopus, Embase, and Google scholar. REVIEW METHODS A systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Following data extraction and processing, a Bayesian network meta-analysis and meta-regression was undertaken. The primary endpoint was telangiectasia and reticular vein clearance. RESULTS Nineteen studies, 16 randomised controlled trials and three prospective case series, including 1 356 patients and 2 051 procedures, were finally incorporated. All interventions, apart from 0.5% sodium tetradecyl sulphate (STS) and 0.25% STS displayed statistically significantly superior telangiectasia and reticular vein clearance compared with normal saline (N/S), Meta-regression analysis employing the type of the venule treated (telangiectasia or reticular vein) as a covariable, revealed a positive correlation between Nd:YAG 1064 nm laser and telangiectasia clearance (β = 1.38, 95% CI 0.56 - 2.14). Further exploration unveiled the superiority of Nd:YAG 1064 nm in the treatment of telangiectasias compared with all included interventions except 72% chromated glycerin (CG). STS 0.25% increased the risk of hyperpigmentation compared with all interventions except 0.5% STS, and 1% polidocanol. CG 72% decreased the risk of matting compared with polidocanol foam (risk ratio [RR] 0.14, 95% CI 0.02 - 0.80) and STS (RR 0.31, 95% CI 0.07 - 0.92). Non-statistically significant differences were identified between interventions regarding pain outcomes. CONCLUSION This network meta-analysis has demonstrated a proportional relationship between sclerosant potency and side effect occurrence in the treatment of telangiectasias and reticular veins and the superiority of laser therapy compared with injection sclerotherapy in treating telangiectasias. The transition of telangiectasia and reticular vein treatment from highly potent detergent solutions to equally effective but milder sclerosants could potentially reduce undesirable adverse events.
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Affiliation(s)
- Vangelis Bontinis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece.
| | - Alkis Bontinis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Andreas Koutsoumpelis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Martin Claridge
- Department of Vascular Surgery, Heart of England NHS Foundation Trust, Birmingham, UK
| | - Angeliki Chorti
- Department of Surgery, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Vasileios Rafailidis
- Department of Radiology, Aristotle University of Thessaloniki, School of Medicine, AHEPA University Hospital, Thessaloniki, Greece
| | - Argirios Giannopoulos
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
| | - Kiriakos Ktenidis
- Department of Vascular Surgery, Aristotle University of Thessaloniki, AHEPA University General Hospital, Thessaloniki, Greece
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Salerno M, Bissacco D, Chi YW, Narayanan S, Addis A, Dellavia C, Canciani E, Gard M, Gianesini S. Empty vein ablation innovative technique for chronic venous disease treatment: proof of concept and ex-vivo analysis. INT ANGIOL 2023; 42:420-426. [PMID: 37377397 DOI: 10.23736/s0392-9590.23.05055-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
BACKGROUND Sclerotherapy is among the mainstays of chronic venous disease treatment, yet its occlusion rate remains suboptimal compared to thermal tumescent techniques. An innovative three-balloons catheter has been developed to allow sclerotherapy in empty vein conditions (empty vein ablation technique, EVA). Aim of this investigation was to describe the EVA technical aspects and related ex-vivo effects on vein wall. METHODS Two samples from jugular veins of an adult sheep were treated by EVA or foam sclerotherapy (FS, Tessari method). Primary outcome was the percentage of circumferential intima treated by EVA or FS; secondary outcomes were intima and media thickness modifications after treatment. RESULTS Intact circumferential residual intima were 6.07±2.94% and 16.55±0.70% after EVA and FS, respectively (P=0.020). Despite the average intima and media thickness did not differ between treatments, EVA demonstrated a homogenous damage throughout the vein segment, while FS effect was less destructive distally to the injection site, because moving away from the injection site and floating, it has a less contact with internal surface of the vein. CONCLUSIONS EVA seems to overcome chemical ablation limits as flushing effect and the increases vein wall/sclerosant agent contact effect compared to FS. Ex-vivo encouraging results need in-vivo validation to evaluate other points like deactivation of sclerosing agent by blood protein and the contact time control between SA and the vein wall. If we have further confirmations in vivo we might think we have a potential higher occlusion rate compared to FS, paving the way for future clinical trials.
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Affiliation(s)
- Mario Salerno
- Unit of Angiology, Department of Medicine and Cardiopulmonary Rehabilitation, IRCCS Maugeri Institute, Tradate, Varese, Italy
- I-VASC S.r.l, Milan, Italy
| | - Daniele Bissacco
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy -
| | - Yung-Wei Chi
- University of California, Davis Vascular Center, Sacramento, CA, USA
| | - Sriram Narayanan
- The Harley Street Heart and Vascular Center, Singapore, Singapore
| | - Alessandro Addis
- CRABCC, Biotechnology Research Center for Cardiothoracic Applications, Rivolta D'Adda, Cremona, Italy
| | - Claudia Dellavia
- Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy
| | - Elena Canciani
- Center for Translational Research on Autoimmune & Allergic Disease-CAAD, Department of Health Sciences, University of Eastern Piedmont, Novara, Italy
| | | | - Sergio Gianesini
- Department of Translational Medicine, University of Ferrara, Ferrara, Italy
- Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
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Guerra JD, Ulloa JH. Foam as seen through the microscope. J Vasc Surg Venous Lymphat Disord 2023; 11:411. [PMID: 36822794 DOI: 10.1016/j.jvsv.2022.09.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/02/2022] [Accepted: 09/09/2022] [Indexed: 02/24/2023]
Affiliation(s)
- José Daniel Guerra
- Division of Vascular Surgery, Department of Surgery, University Hospital Fundación Santa Fe de Bogotá, Bogotá, Colombia.
| | - Jorge Hernando Ulloa
- Division of Vascular Surgery, Department of Surgery, University Hospital Fundación Santa Fe de Bogotá, Bogotá, Colombia
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Whiteley MS. Current Best Practice in the Management of Varicose Veins. Clin Cosmet Investig Dermatol 2022; 15:567-583. [PMID: 35418769 PMCID: PMC8995160 DOI: 10.2147/ccid.s294990] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/27/2022] [Indexed: 12/01/2022]
Abstract
This article outlines the current best practice in the management of varicose veins. “Varicose veins” traditionally means bulging veins, usually seen on the legs, when standing. It is now a general term used to describe these bulging veins, and also underlying incompetent veins that reflux and cause the surface varicose veins. Importantly, “varicose veins” is often used for superficial venous reflux even in the absence of visible bulging veins. These can be simply called “hidden varicose veins”. Varicose veins usually deteriorate, progressing to discomfort, swollen ankles, skin damage, leg ulcers, superficial venous thrombosis and venous bleeds. Patients with varicose veins and symptoms or signs have a significant advantage in having treatment over conservative treatment with compression stockings or venotropic drugs. Small varicose veins or telangiectasia without symptoms or signs can be treated for cosmetic reasons. However, most have underlying venous reflux from saphenous, perforator or local “feeding veins” and so investigation with venous duplex should be mandatory before treatment. Best practice for investigating leg varicose veins is venous duplex ultrasound in the erect position, performed by a specialist trained in ultrasonography optimally not the doctor who performs the treatment. Pelvic vein reflux is best investigated with transvaginal duplex ultrasound (TVS), performed using the Holdstock-Harrison protocol. In men or women unable to have TVS, venography or cross-sectional imaging is needed. Best practice for treating truncal vein incompetence is endovenous thermal ablation. Increasing evidence suggests that significant incompetent perforating veins should be found and treated by thermal ablation using the transluminal occlusion of perforator (TRLOP) approach, and that incompetent pelvic veins refluxing into symptomatic varicose veins in the genital region or leg should be treated by coil embolisation. Bulging varicosities should be treated by phlebectomy at the time of truncal vein ablation. Monitoring and reporting outcomes is essential for doctors and patients; hence, participation in a venous registry should probably be mandatory.
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de Ávila Oliveira R, Riera R, Vasconcelos V, Baptista-Silva JC. Injection sclerotherapy for varicose veins. Cochrane Database Syst Rev 2021; 12:CD001732. [PMID: 34883526 PMCID: PMC8660237 DOI: 10.1002/14651858.cd001732.pub3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND Varicose veins are enlarged and tortuous veins, affecting up to one-third of the world's population. They can be a cause of chronic venous insufficiency, which is characterised by oedema, pigmentation, eczema, lipodermatosclerosis, atrophie blanche, and healed or active venous ulcers. Injection sclerotherapy (liquid or foam) is widely used for treatment of varicose veins aiming to transform the varicose veins into a fibrous cord. However, there is limited evidence regarding its effectiveness and safety, especially in patients with more severe disease. This is the second update of the review first published in 2002. OBJECTIVES To assess the effectiveness and safety of injection sclerotherapy for the treatment of varicose veins. SEARCH METHODS For this update, the Cochrane Vascular Information Specialist searched the Cochrane Vascular Specialised Register, CENTRAL, MEDLINE, Embase, AMED, CINAHL, and LILACS databases, and the World Health Organization International Clinical Trials Registry Platform and ClinicalTrials.gov trials registries, on 20 July 2021. SELECTION CRITERIA We included all randomised controlled trials (RCTs) (including cluster-randomised trials and first phase cross-over studies) that used injection sclerotherapy for the treatment of varicose veins. DATA COLLECTION AND ANALYSIS Two review authors independently assessed, selected and extracted data. Disagreements were cross-checked by a third review author. We used Cochrane's Risk of bias tool to assess the risk of bias. The outcomes of interest were cosmetic appearance, complications, residual varicose veins, quality of life (QoL), persistence of symptoms, and recurrent varicose veins. We calculated risk ratios (RRs) or mean difference (MD) with 95% confidence intervals (CIs). We used the worst-case-scenario for dichotomous data imputation for intention-to-treat analyses. For continuous outcomes, we used the 'last-observation-carried-forward' for data imputation if there was balanced loss to follow-up. We assessed the certainty of the evidence using the GRADE approach. MAIN RESULTS We included 23 new RCTs for this update, bringing the total to 28 studies involving 4278 participants. The studies differed in their design, and in which sclerotherapy method, agent or concentration was used. None of the included RCTs compared sclerotherapy to no intervention or to any pharmacological therapy. The certainty of the evidence was downgraded for risk of bias, low number of studies providing information for each outcome, low number of participants, clinical differences between the study participants, and wide CIs. Sclerotherapy versus placebo Foam sclerotherapy may improve cosmetic appearance as measured by IPR-V (independent photography review - visible varicose veins scores) compared to placebo (polidocanol 1%: mean difference (MD) -0.76, 95% CI -0.91 to -0.60; 2 studies, 223 participants; very low-certainty evidence); however, deep vein thrombosis (DVT) rates may be slightly increased in this intervention group (RR 5.10, 95% CI 1.30 to 20.01; 3 studies, 302 participants; very low-certainty evidence). Residual varicose vein rates may be decreased following polidocanol 1% compared to placebo (RR 0.19, 95% CI 0.13 to 0.29; 2 studies, 225 participants; very low-certainty evidence). Following polidocanol 1% use, there may be a possible improvement in QoL as assessed using the VEINES-QOL/Sym questionnaire (MD 12.41, 95% CI 9.56 to 15.26; 3 studies, 299 participants; very low-certainty evidence), and possible improvement in varicose vein symptoms as assessed using the Venous Clinical Severity Score (VCSS) (MD -3.25, 95% CI -3.90 to -2.60; 2 studies, 223 participants; low-certainty evidence). Recurrent varicose veins were not reported for this comparison. Foam sclerotherapy versus foam sclerotherapy with different concentrations Three individual RCTs reported no evidence of a difference in cosmetic appearance after comparing different concentrations of the intervention; data could not be pooled for two of the three studies (RR 1.11, 95% CI 0.84 to 1.47; 1 study, 80 participants; very low-certainty evidence). Similarly, there was no clear difference in rates of thromboembolic complications when comparing one foam concentration with another (RR 1.47, 95% CI 0.41 to 5.33; 3 studies, 371 participants; very low-certainty evidence). Three RCTs investigating higher concentrations of polidocanol foam indicated the rate of residual varicose veins may be slightly decreased in the polidocanol 3% foam group compared to 1% (RR 0.67, 95% CI 0.43 to 1.04; 3 studies, 371 participants; moderate-certainty evidence). No clear improvement in QoL was detected. Two RCTs reported improved VCSS scores with increasing concentrations of foam. Persistence of symptoms were not reported for this comparison. There was no clear difference in recurrent varicose vein rates (RR 0.91, 95% CI 0.62 to 1.32; 1 study, 148 participants; low-certainty evidence). Foam sclerotherapy versus liquid sclerotherapy One RCT reported on cosmetic appearance with no evidence of a difference between foam or liquid sclerotherapy (patient satisfaction scale MD 0.2, 95% CI -0.27 to 0.67; 1 study, 126 participants; very low-certainty evidence). None of the RCTs investigated thromboembolic complications, QoL or persistence of symptoms. Six studies individually showed there may be a benefit to polidocanol 3% foam over liquid sclerotherapy in reducing residual varicose vein rate; pooling data from two studies showed a RR of 0.51, with 95% CI 0.41 to 0.65; 203 participants; very low-certainty evidence. One study reported no clear difference in recurrent varicose vein rates when comparing sodium tetradecyl sulphate (STS) foam or liquid (RR 1.10, 95% CI 0.86 to 1.42; 1 study, 286 participants; very low-certainty evidence). Sclerotherapy versus sclerotherapy with different substances Four RCTs compared sclerotherapy versus sclerotherapy with any other substance. We were unable to combine the data due to heterogeneity or assess the certainty of the evidence due to insufficient data. AUTHORS' CONCLUSIONS There is a very low to low-certainty evidence that, compared to placebo, sclerotherapy is an effective and safe treatment for varicose veins concerning cosmetic appearance, residual varicose veins, QoL, and persistence of symptoms. Rates of DVT may be slightly increased and there were no data concerning recurrent varicose veins. There was limited or no evidence for one concentration of foam compared to another; foam compared to liquid sclerotherapy; foam compared to any other substance; or one technique compared to another. There is a need for high-quality trials using standardised sclerosant doses, with clearly defined core outcome sets, and measurement time points to increase the certainty of the evidence.
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Affiliation(s)
| | - Rachel Riera
- Cochrane Brazil Rio de Janeiro, Cochrane, Petrópolis, Brazil
| | - Vladimir Vasconcelos
- Department of Surgery, Division of Vascular and Endovascular Surgery, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Jose Cc Baptista-Silva
- Evidence Based Medicine, Cochrane Brazil, Universidade Federal de São Paulo, São Paulo, Brazil
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No significant difference between 1940 and 1470 nm in endovenous laser ablation using an in vitro porcine liver model. Lasers Med Sci 2021; 37:1899-1906. [PMID: 34687391 DOI: 10.1007/s10103-021-03449-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Accepted: 10/18/2021] [Indexed: 10/20/2022]
Abstract
Current endovenous laser ablation (EVLA) practice favours 1470 nm, as water is a major chromophore for this wavelength. Water has a greater affinity for 1940 nm, leading to claims that lower powers or linear endovenous energy densities (LEEDs) are needed. We compared the thermal spread and carbonisation of EVLA using these two wavelengths, in the porcine liver model. Using the previously validated porcine liver model, we performed 5 treatments, at each power: 2 W, 4 W, 6 W, 8 W and 10 W using a standard pullback of 8 s/cm. This gave LEEDs for each wavelength of 16, 32, 48, 64 and 80 J/cm. Digital images were given random codes and analysed by two blinded observers. Thermal spread was measured using "SketchandCalc" online software and graded carbonisation from 0 (none) to 3 (black carbon tract). There was no significant difference in thermal spread between the two wavelengths at 6 W, 8 W and 10 W. At 2 W, the 1470-nm laser had a significantly increased thermal spread over the 1940 nm. Significantly more carbonisation was found with the 1940-nm laser compared to 1470 nm. In this model, there was no significant difference in thermal spread at powers of 6 W and more. At 2 W and potentially 4 W, 1470 nm showed spread than 1940 nm, due to increased absorption at the device/tissue interface. At powers and LEEDs used for saphenous ablation, we found no evidence to support reduced power or LEED when using 1940 nm. However, 1940 nm may be more advantageous than 1470 nm when ablating small thin-walled veins, near to the skin.
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Kabnick LS, Phelan N, Cummins S, O Hynes S. A pre-clinical animal study of a novel mechanical-only ablation device treatment for superficial venous disease. Phlebology 2021; 37:112-119. [PMID: 34553616 DOI: 10.1177/02683555211045868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Current minimally invasive techniques for ablation in superficial venous reflux are limited to thermal based systems requiring tumescent anesthesia, non-thermal chemical sclerosants and permanent glue implantation. The aim of this feasibility study was to determine the safety and efficacy of a novel mechanical-only ablation (MOA) device called EnVena, in a recognised large animal model with chronic follow up. METHODS Venous ablation of six lateral saphenous veins in three sheep was performed using the EnVena device. Luminal patency and vein wall fibrosis were evaluated by histologic analysis at 51 and 89 days. RESULTS All treated veins demonstrated fibrotic occlusion in contiguous segments at 51 and 89 days on histological analysis. From 45 consecutive segments spanning the treatment length across the six treated veins, 26 (57%) were fully occluded, 7 (16%) were impinged or partially occluded and 12 (27%) were open. There were no device related complications during the follow up period. CONCLUSIONS A purely mechanical approach to superficial venous ablation demonstrated safety and efficacy in a recognized large animal model based on histological findings.
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Affiliation(s)
| | | | | | - Seán O Hynes
- Department of Histopathology, University Hospital Galway and National University of Ireland, Galway, Ireland
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Yang B, Nie QQ, Fan XQ, Zhang JB, Liu P. Histopathological analysis of incompetent great saphenous veins after mechanochemical ablation treatment - An ex-vivo experiment. Vascular 2021; 30:349-356. [PMID: 33878955 DOI: 10.1177/17085381211007613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND The endovascular technique of mechanochemical ablation (MOCA) has become popular in treating patients with saphenous reflux. We reported the histopathological findings in human ex-vivo incompetent great saphenous veins following treatment with saline, polidocanol, mechanical ablation and MOCA using ClariVein device. METHODS Twenty-four vein GSV specimens were obtained via traditional surgery and treated with four methods: Group A: 0.9% normal saline (NS); Group B: 3% polidocanol; Group C: mechanical ablation + 0.9% NS; Group D: mechanical ablation + 3% polidocanol (MOCA). Hematoxylin and eosin (HE), Masson's trichrome and immunohistochemical staining were performed on each specimen and integrated optical densities were measured with vWF and a-SMA stains and statistically evaluated. vWF staining was used to assess endothelial damage and a a-SMA staining was used to assess media injury. RESULTS HE and Masson's trichrome staining of Groups C and D revealed severe damage to the endothelium and media compared to Groups A and B. The statistical result of vWF staining showed the damage of endothelium was significantly increased by Group D compared to Groups A, B and C. The statistical result of a-SMA staining showed the damage of media was significantly increased by Groups C and D compared to Groups A and B. CONCLUSIONS The mechanism of MOCA was caused by both endothelium damage and media tearing. The damage of endothelium was significantly increased by MOCA when compared with mechanical ablation alone.
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Affiliation(s)
- Bo Yang
- Peking University China-Japan Friendship School of Clinical Medicine, Beijing, China
| | - Qiang-Qiang Nie
- Department of Cardiovascular, China-Japan Friendship Hospital, Beijing, China
| | - Xue-Qiang Fan
- Department of Cardiovascular, China-Japan Friendship Hospital, Beijing, China
| | - Jian-Bin Zhang
- Department of Cardiovascular, China-Japan Friendship Hospital, Beijing, China
| | - Peng Liu
- Department of Cardiovascular, China-Japan Friendship Hospital, Beijing, China
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Whiteley MS, Taylor LK, King JC, Hughes BE. Clinical dilemma of management: Cardiac arrest after microsclerotherapy for lower limb telangiectasia with liquid 0.3% aethoxysklerol or idiopathic cardiac arrest? SAGE Open Med Case Rep 2021; 9:2050313X211000866. [PMID: 33786187 PMCID: PMC7958149 DOI: 10.1177/2050313x211000866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 02/17/2021] [Indexed: 11/15/2022] Open
Abstract
A 48-year-old woman attended to discuss a dilemma. She had suffered a cardiac arrest
immediately following microsclerotherapy of leg telangiectasia with 0.3% aethoxysklerol.
She had successful defibrillation and been transferred to hospital. In hospital, despite
normal cardiac tests, she was diagnosed as having idiopathic cardiac arrest. The exposure
to aethoxysklerol was discounted by her cardiologists as a cause of her arrest. Following
the hospital protocol, she was strongly advised to have an implantable defibrillator.
Cardiac arrest and myocardial infarction are documented after aethoxysklerol injection
with proposed mechanisms being anaphylaxis, direct cardiotoxicity or endothelin-1 release.
Before consenting to an implantable defibrillator, which may have its own complications in
the long term, doctors and the patient need to be certain that this arrest was not due to
a reaction to aethoxysklerol.
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Affiliation(s)
- Mark S Whiteley
- The Whiteley Clinic, Guildford, UK.,Faculty of Health and Biomedical Sciences, University of Surrey, Guildford, UK
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12
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Critello DC, Pullano SA, Gallo G, Matula TJ, Fiorillo AS. Low frequency ultrasound as a potentially viable foaming option for pathological veins. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124919] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Gonzalez Ochoa AJ, Carrillo J, Manríquez D, Manrique F, Vazquez AN. Reducing hyperpigmentation after sclerotherapy: A randomized clinical trial. J Vasc Surg Venous Lymphat Disord 2020; 9:154-162. [PMID: 32739509 DOI: 10.1016/j.jvsv.2020.06.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 06/25/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Sclerotherapy for the treatment of varicose veins is one of the most common medical procedures performed in the Western world, and hyperpigmentation is one of the most frequent, dreaded, minor adverse events. There has recently been some interest in investigating the inflammatory response of the local endothelium after sclerotherapy and the possible benefits of venoactive drugs because of their pleiotropic properties. The aim of this study was to evaluate whether adding a venoactive drug (sulodexide) to the standard sclerotherapy treatment protocol for patients with varicose veins can reduce the occurrence of postsclerotherapy hyperpigmentation. METHODS We carried out a prospective, multicenter, randomized controlled trial with a parallel group design. It included 720 patients with telangiectasia, reticular veins, or varicose veins who were candidates for sclerotherapy. Patients with reflux in deep system or saphenous veins were excluded. Group A consisted of 354 patients who received an oral dose of sulodexide twice a day for 7 days before scheduled sclerotherapy; the treatment then continued for 3 months. Group B consisted of 366 patients who received the standard sclerotherapy protocol. Polidocanol was used as the sclerosing agent, and 20 to 30 mm Hg compression stockings were used in both groups for 7 days. Control photographs were taken, and a follow-up examination took place after 1 month and 3 months. Computer software was used to analyze the treated area for incidence of hyperpigmentation, total area of hyperpigmentation, skin tone increase in the hyperpigmented area, vein disappearance, and incidence of major bleeding. The sample size was calculated to give a statistical power of 80%. Student t-test and the χ2 test were used for comparative analyses, as appropriate. The level of significance was set at P < .05. RESULTS A total of 609 patients completed the 3-month follow-up: 312 in group A and 297 in group B. After 1 month, the incidence of hyperpigmentation was 8.7% in group A and 14.8% in group B (P = .01). Group A developed an average area of hyperpigmentation of 10.7% compared with 18.2% in group B (P = .01), and the skin tone of the hyperpigmented area was lower in group A than in group B (P = .02). However, the latter difference was not significant after 3 months. The overall vein disappearance rate was similar in both groups. CONCLUSIONS Our analysis shows that by adding a venoactive drug (sulodexide) to the standard sclerotherapy protocol, the occurrence of hyperpigmentation is reduced without affecting the desired therapeutic vein elimination response.
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Affiliation(s)
- Alejandro Jose Gonzalez Ochoa
- HGZ 12 Instituto Mexicano del Seguro Social, San Luis Rio Colorado, Sonora, Mexico; CLINEDEM, San Luis Rio Colorado, Sonora, Mexico.
| | - Joaquín Carrillo
- Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexicali, Baja California, Mexico
| | - Diana Manríquez
- Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexicali, Baja California, Mexico
| | | | - Alejandro Nuricumbo Vazquez
- Instituto de Seguridad y Servicios Sociales de los Trabajadores del Gobierno y Municipios del Estado Baja California, Mexicali, Baja California, Mexico
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Connor DE, Gerbelli J, Chew AN, Cooley-Andrade O, Goonawardhana D, Cheung K, Parsi K. Sirolimus and propranolol inhibit endothelial proliferation while detergent sclerosants induce endothelial activation, microparticle release and apoptosis in vitro. Phlebology 2020; 35:566-575. [PMID: 32216526 DOI: 10.1177/0268355520913384] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES To investigate the effects of detergent sclerosants, sodium tetradecyl sulphate and polidocanol, on endothelial cell activation and microparticle release and the effects of detergent sclerosants, sirolimus and propranolol, on apoptosis in vitro. METHODS Cultured human umbilical vein endothelial cells and murine haemangioendothelioma (EOMA) cell lines were incubated with different concentrations of sodium tetradecyl sulphate and polidocanol, as well as sirolimus and propranolol. Endothelial activation was assessed using flow cytometry for CD62e (E-Selectin), CD54 (ICAM-1), CD105 (endoglin), CD144 (VE-Cadherin), CD146 (MCAM) and the release of endothelial microparticles. Cell proliferation was assessed using [3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium] and carboxyfluorescein succinimidyl ester assays. Apoptosis was assessed using flow cytometry for lactadherin/propidium iodide staining and for Caspase-3 expression. RESULTS Sublytic concentrations of sodium tetradecyl sulphate and polidocanol (0.075%-0.3%) increased the expression of the activation markers CD62e and CD54. The expression of CD105 decreased in sclerosant treated cultured human umbilical vein endothelial cells. Both sodium tetradecyl sulphate and polidocanol induced the release of endothelial microparticles. All agents inhibited cell proliferation. Sodium tetradecyl sulphate and polidocanol-induced apoptosis as evidenced by increased phosphatidylserine exposure and caspase-3 expression, whereas sirolimus and propranolol increased caspase-3 expression only. CONCLUSION Sublytic concentrations of detergent sclerosants induce endothelial activation and the release of endothelial microparticles. All agents were anti-proliferative in EOMA cell lines, with sodium tetradecyl sulphate and polidocanol inducing cellular apoptosis.
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Affiliation(s)
- David E Connor
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Jessica Gerbelli
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia.,Centro Universitário Barão de Mauá, Ribeirão Preto, Brazil
| | - An-Ning Chew
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Osvaldo Cooley-Andrade
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Dulani Goonawardhana
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Kelvin Cheung
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Kurosh Parsi
- Dermatology, Phlebology and Fluid Mechanics Research Laboratory, St. Vincent's Centre for Applied Medical Research, St. Vincent's Hospital, Sydney, Australia.,Faculty of Medicine, University of New South Wales, Sydney, Australia
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Ashpitel HF, Dabbs EB, Salguero FJ, Nemchand JL, La Ragione RM, Whiteley MS. Histopathologic differences in the endovenous laser ablation between jacketed and radial fibers, in an ex vivo dominant extrafascial tributary of the great saphenous vein in an in vitro model, using histology and immunohistochemistry. J Vasc Surg Venous Lymphat Disord 2020; 7:234-245. [PMID: 30771831 DOI: 10.1016/j.jvsv.2018.09.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 09/20/2018] [Indexed: 10/27/2022]
Abstract
OBJECTIVE The study aimed to investigate the biologic effects of the 1470-nm endovenous laser (EVL), with a jacketed fiber and a radial fiber, during EVL ablation of an ex vivo dominant extrafascial tributary of the great saphenous vein in our in vitro model by histology and immunohistochemistry. METHODS Ten segments of the dominant extrafascial tributary of the great saphenous vein were harvested by a consultant vascular surgeon from patients during routine varicose vein surgery. Six segments were treated using an ex vivo model of our design by a 1470-nm EVL with a jacketed fiber. The other four segments were also treated by a 1470-nm EVL but with a radial-firing fiber. Each segment was split into five sections and treated at five different linear endovenous energy densities (LEEDs) at 10 W: 0, 20, 40, 60, and 80 J/cm. The veins were incubated and subsections collected at 6 and 24 hours after treatment. Subsections were immersed in buffered formalin and taken for histologic and immunohistochemical analysis. Histopathologic analysis was then performed. RESULTS Treatment with the radial fiber led to a pattern of damage that was more homogeneous than with the jacketed fiber, with no carbonization of tissue present. Significant transmural damage and necrosis were observed at LEEDs of 60 and 80 J/cm in both treatment groups. At the same LEEDs, p53 and caspase 3 analysis showed that transmural cell wall vein death (necrosis or apoptosis) occurred by 6 hours after treatment with both fibers. CONCLUSIONS There was a significant difference in the effects of treatment with a jacketed fiber and a radial fiber in EVL ablation in vitro. Although both fibers caused transmural vein wall cell death at similar LEEDs, the pattern of damage with the radial fiber was more homogeneous. There was no overtreatment of tissue in terms of carbonization after treatment with the radial fiber. Treatment with the jacketed fiber showed carbonization of tissue at the same LEEDs.
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Affiliation(s)
- Henry F Ashpitel
- Research Department, The Whiteley Clinic, Guildford, Surrey, United Kingdom; Department of Pathology and Infectious Diseases, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Emma B Dabbs
- Research Department, The Whiteley Clinic, Guildford, Surrey, United Kingdom
| | - Francisco J Salguero
- Department of Pathology and Infectious Diseases, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Jaya L Nemchand
- Research Department, The Whiteley Clinic, Guildford, Surrey, United Kingdom; Department of Pathology and Infectious Diseases, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Roberto M La Ragione
- Department of Pathology and Infectious Diseases, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Mark S Whiteley
- Research Department, The Whiteley Clinic, Guildford, Surrey, United Kingdom; Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, United Kingdom.
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16
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Joyce DP, Walsh SR, Yap CJQ, Chong TT, Tang TY. Compression therapy following ClariVein® ablation therapy: a randomised controlled trial of COMpression Therapy Following MechanO-Chemical Ablation (COMMOCA). Trials 2019; 20:678. [PMID: 31806052 PMCID: PMC6894465 DOI: 10.1186/s13063-019-3787-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 10/05/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Endovenous treatment of varicose veins has increased in popularity over the last decade. There remains, however, a degree of uncertainty regarding the role of compression bandaging or hosiery following this intervention. The National Institute for Clinical Excellence Guideline Development Group has advocated further research to evaluate the clinical and cost-effectiveness of this post-procedure intervention. In addition to this, the duration of compression bandaging also warrants clarification. METHODS Ethical approval for the study was obtained from the Singhealth Centralised Institutional Review Board (CIRB Ref: 2017/2710). Consent to enter the study will be sought from each participant only after a full explanation has been given, an information leaflet offered and time allowed for consideration. Signed participant consent will be obtained. Patients will be randomised to either compression (group A) or no compression (group B). The primary aim of the study is to assess the patient's pain scores for the first 10 days post procedure using a visual analogue scale. Secondary aims include an assessment of patient compliance with compression, quality of life scores, clinical effectiveness, rates of bruising and phlebitis, time taken to return to normal activities, patient satisfaction and occlusion rate at 6 months. DISCUSSION The purpose of this study is to examine the effect of compression therapy in patients having mechano-chemical ablation (MOCA) therapy for truncal incompetence of their varicose veins using the ClariVein® device. This study may provide clarification on the role of compression therapy in patients undergoing MOCA. TRIAL REGISTRATION ClinicalTrials.gov, NCT03685838. Registered on 26 September 2018.
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Affiliation(s)
- Doireann P Joyce
- Department of Vascular Surgery, Galway University Hospital, Galway, Ireland
| | - Stewart R Walsh
- Department of Vascular Surgery, Galway University Hospital, Galway, Ireland
| | - Charyl J Q Yap
- Department of Vascular Surgery, Singapore General Hospital, Singapore, Singapore
| | - Tze T Chong
- Department of Vascular Surgery, Singapore General Hospital, Singapore, Singapore
| | - Tjun Y Tang
- Department of Vascular Surgery, Singapore General Hospital, Singapore, Singapore.
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17
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Critello CD, Pullano SA, Matula TJ, De Franciscis S, Serra R, Fiorillo AS. Recent developments on foaming mechanical and electronic techniques for the management of varicose veins. Expert Rev Med Devices 2019; 16:931-940. [PMID: 31622557 DOI: 10.1080/17434440.2019.1682549] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Introduction: Varicose veins are a common disease, causing significant impairment of quality of life to afflicted individuals. Conventional surgery has represented the traditional treatment for years, with significant post-operative complications. By the end of the 20th century, novel approaches had been developed to induce biochemical sclerosis into the treated vein in order to exclude it from blood circulation.Areas covered: Foaming techniques for treatment of varicose veins, both clinically-approved methods and those under experimental studies. A brief description of cavitation, which is the basis of microbubbles formation, and an overview of foam properties have been also provided, including a discussion on clinical efficacy and safety profile.Expert commentary: Foam sclerotherapy has rapidly gained popularity since it represents the most minimally invasive and cost-effective procedure in the short term. Several different methods of foam preparation have been described in literature. In general, the foam generation method may affect characteristics such as stability and bubble size distribution, which in turn affect the therapeutic action of foam itself. Therefore, the selection of a suitable foaming technique is of importance for treatment success. Future developments on foaming techniques are expected to make sclerotherapy, already an effective treatment, even safer and more versatile therapeutic procedure.
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Affiliation(s)
- C Davide Critello
- Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Salvatore A Pullano
- Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Thomas J Matula
- Applied Physics Laboratory, University of Washington, Seattle, WA, USA
| | - Stefano De Franciscis
- Department of Surgical and Medical Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Raffaele Serra
- Department of Surgical and Medical Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Antonino S Fiorillo
- Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
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18
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Bottaro E, Paterson JAJ, Quercia L, Zhang X, Hill M, Patel VA, Jones SA, Lewis AL, Millar TM, Carugo D. In vitro and ex vivo evaluation of the biological performance of sclerosing foams. Sci Rep 2019; 9:9880. [PMID: 31285447 PMCID: PMC6614483 DOI: 10.1038/s41598-019-46262-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 06/21/2019] [Indexed: 11/09/2022] Open
Abstract
Since the first reports on foam sclerotherapy, multiple studies have been conducted to determine the physical properties and behavior of foams, but relatively little is known about their biological effects on the endothelial cells lining the vessel wall. Moreover, a systematic comparison of the biological performance of foams produced with different methods has not been carried out yet. Herein, a 2D in vitro method was developed to compare efficacy of commercially available polidocanol injectable foam (PEM, Varithena) and physician-compounded foams (PCFs). Endothelial cell attachment upon treatment with foam was quantified as an indicator of therapeutic efficacy, and was correlated with foam physical characteristics and administration conditions. An ex vivo method was also developed to establish the disruption and permeabilisation of the endothelium caused by sclerosing agents. It relied on the quantitation of extravasated bovine serum albumin conjugated to Evans Blue, as an indicator of endothelial permeability. In our series of comparisons, PEM presented a greater overall efficacy compared to PCFs, across the different biological models, which was attributed to its drainage dynamics and gas formulation. This is consistent with earlier studies that indicated superior physical cohesiveness of PEM compared to PCFs.
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Affiliation(s)
- Elisabetta Bottaro
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | | | - Luciano Quercia
- Computer Science Department, University of Bari, Bari, Italy
| | - Xunli Zhang
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
- Institue for Life Sciences (IfLS), University of Southampton, Southampton, UK
| | - Martyn Hill
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
- Institue for Life Sciences (IfLS), University of Southampton, Southampton, UK
| | - Venisha A Patel
- Biocompatibles UK Ltd., Lakeview, Riverside Way, Watchmoor Park, Camberley, UK
| | - Stephen A Jones
- Biocompatibles UK Ltd., Lakeview, Riverside Way, Watchmoor Park, Camberley, UK
| | - Andrew L Lewis
- Biocompatibles UK Ltd., Lakeview, Riverside Way, Watchmoor Park, Camberley, UK
| | - Timothy M Millar
- Faculty of Medicine, University of Southampton, Southampton, UK.
| | - Dario Carugo
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK.
- Institue for Life Sciences (IfLS), University of Southampton, Southampton, UK.
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Bai T, Liu Y, Liu J, Yu C, Jiang W, Fan Y. A comparison of different surfactants on foam stability in foam sclerotherapy in vitro. J Vasc Surg 2019; 69:581-591.e1. [DOI: 10.1016/j.jvs.2018.02.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 02/20/2018] [Indexed: 11/30/2022]
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20
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Validation of a Gravitational Model to Study Local Endogenous Biomarkers in Chronic Venous Insufficiency. Eur J Vasc Endovasc Surg 2018; 56:865-873. [DOI: 10.1016/j.ejvs.2018.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Accepted: 08/02/2018] [Indexed: 02/01/2023]
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Whiteley MS. Re. "Comments to: Histological and Immunofluorescent Analysis of the Large Tributary of the Great Saphenous Vein Treated With a 1920 nm Endovenous Laser: Preliminary Findings". EJVES Short Rep 2018; 41:26-27. [PMID: 30582024 PMCID: PMC6300457 DOI: 10.1016/j.ejvssr.2018.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 10/17/2018] [Indexed: 11/07/2022] Open
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Deak ST. Retrograde administration of ultrasound-guided endovenous microfoam chemical ablation for the treatment of superficial venous insufficiency. J Vasc Surg Venous Lymphat Disord 2018; 6:477-484. [PMID: 29909854 DOI: 10.1016/j.jvsv.2018.03.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 03/08/2018] [Indexed: 02/06/2023]
Abstract
OBJECTIVE This study measured patient outcomes among symptomatic patients with superficial chronic venous insufficiency who were treated with retrograde ultrasound-guided polidocanol microfoam 1% in a community setting. METHODS Between March 2015 and June 2017, 250 symptomatic patients with C2-C6 chronic venous insufficiency received polidocanol microfoam 1% and were followed for 16 ± 7 months. Sixteen of the 250 patients (6.4%) had skin ulcers, and 56 (22.4%) were treated previously with thermal or surgical interventions. All patients underwent a duplex ultrasound venous incompetence study to map perforators and veins to be treated. Incompetent veins were accessed with a micropuncture needle distal to the midthigh perforator, approximately 10 cm above the knee fold. The leg was then elevated 45°. Under ultrasound guidance, the incompetent greater saphenous vein was closed with polidocanol microfoam 1%. A second injection was administered through the same catheter directing the microfoam to flow in a retrograde fashion through the incompetent venous valves to the ankle. RESULTS All patients completed the initial treatment; 55 (22.0%) required planned secondary treatment during the follow-up period for residual venous reflux in the below-knee greater saphenous vein. Complete elimination of venous valvular reflux and symptom improvement was documented in 236 patients (94.4%). Minor adverse events included asymptomatic deep vein thrombi (n = 2), common femoral vein thrombus extension (n = 1), and superficial venous thrombi (n = 4). Of the 16 patients with skin ulcers, 10 were C6 patients and 80% experienced wound closure within 4 weeks of treatment. CONCLUSIONS Retrograde administration of polidocanol microfoam 1% is a safe and effective treatment with important clinical benefit for superficial venous insufficiency in community practice.
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Zhu J, Qi X, Yu H, Su C, Guo X. Acid suppression in patients treated with endoscopic therapy for the management of gastroesophageal varices: a systematic review and meta-analysis. Expert Rev Gastroenterol Hepatol 2018; 12:617-624. [PMID: 29564926 DOI: 10.1080/17474124.2018.1456918] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIM Endoscopic therapy is the cornerstone choice for the management of varices and variceal hemorrhage. The aim of the present systematic review and meta-analysis was to evaluate the efficacy of acid suppression in patients treated with endoscopic therapy for gastroesophageal varices. METHODS All eligible studies were searched via the PubMed, EMBASE, and Cochrane Library databases. Incidence of bleeding, mortality, ulcers, chest pain, and dysphagia after endoscopic therapy and length of stay were analyzed. Subgroup analyses were performed according to the types and major indications of endoscopic treatments. Odds ratios (ORs) with 95% confidence intervals (95%CIs) were calculated. RESULTS Nine studies with 1470 patients were included. Acid suppression could significantly decrease the incidence of bleeding (OR = 0.39, 95%CI: 0.19-0.81, P = 0.01) and diminish the ulcer size (OR = 0.78, 95%CI: 0.38-1.57, P = 0.48) after endoscopic therapy. The subgroup analyses showed that acid suppression could significantly decrease the incidence of bleeding in patients undergoing prophylactic EVL, rather than in patients undergoing therapeutic EVL. There was no significant difference in the incidence of mortality, ulcers, chest pain, and dysphagia and length of stay between patients treated with and without acid suppression. CONCLUSION Acid suppression might be considered in patients undergoing prophylactic EVL for gastroesophageal varices.
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Affiliation(s)
- Jia Zhu
- a Liver Cirrhosis Study Group, Department of Gastroenterology , General Hospital of Shenyang Military Area , Shenyang , China
- b Postgraduate College , Shenyang Pharmaceutical University , Shenyang , China
| | - Xingshun Qi
- a Liver Cirrhosis Study Group, Department of Gastroenterology , General Hospital of Shenyang Military Area , Shenyang , China
| | - Haonan Yu
- b Postgraduate College , Shenyang Pharmaceutical University , Shenyang , China
| | - Chunping Su
- c Library of Fourth Military Medical University , Xi'an , China
| | - Xiaozhong Guo
- a Liver Cirrhosis Study Group, Department of Gastroenterology , General Hospital of Shenyang Military Area , Shenyang , China
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Histological and Immunofluorescent Analysis of a Large Tributary of the Great Saphenous Vein Treated with a 1920 nm Endovenous Laser: Preliminary Findings. EJVES Short Rep 2018; 39:7-11. [PMID: 29988869 PMCID: PMC6033209 DOI: 10.1016/j.ejvssr.2018.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 03/11/2018] [Accepted: 03/18/2018] [Indexed: 11/23/2022] Open
Abstract
Objectives To analyse the biological effects of a 1920 nm endovenous laser (EVL) on extra-fascial great saphenous vein (GSV) in vitro. Methods A 10 cm length of a large tributary bypassing a hypoplastic segment of the GSV (sometimes called an “extra-fascial GSV”) was obtained during routine varicose vein surgery. The length was treated in five sections with different LEEDs (0 (control), 20, 40, 60, and 80 J/cm) with a 1920 nm EVL at 4W power, in a novel in vitro treatment model. The biological effects were assessed by histological staining of the samples for haematoxylin and eosin (HE) and Martius Scarlet Blue (MSB), and by immunofluorescent detection of p-p53 and VCAM-1. Results Histological analysis showed significant structural damage at LEEDs above 60 J/cm, especially in the intima and media, with the treatment at 80 J/cm causing perforation of the vein wall. In addition, there was a significant increase in p-p53 expression in treated tissue at 60 and 80 J/cm. Conclusions Using this ex vivo model, the results indicate that in vitro treatment with a 1920 nm EVL, at or above an LEED of 60 J/cm and 4 W power, causes significant vein wall cell death reaching deep into the media by a combination of direct thermal damage and apoptosis. A wavelength of 1920 nm appears to be effective for the endovenous ablation of truncal veins. Biological effects of 1920 nm EVL examined using ex vivo tissue in an in vitro model. Significant structural damage in vein wall identified with treatment above 60 J/cm. Significant upregulation of apoptosis in vein wall treated with 60 and 80 J/cm. Results imply the joint role of structural damage and apoptosis in vein ablation. 1920 nm appears to be an effective wavelength for EVLA of truncal veins.
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Bush R, Bush P. Response to Professor Whitely, concerning “Evaluation of sodium tetradecyl sulfate and polidocanol as sclerosants for leg telangiectasia based on histological evaluation with clinical correlation”. Phlebology 2018; 33:215-216. [DOI: 10.1177/0268355517744924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - Peggy Bush
- Water's Edge Dermatology, Stuart, FL, USA
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Whiteley MS. Letter Re: Evaluation of sodium tetradecyl sulfate and polidocanol as sclerosants for leg telangiectasia based on histological evaluation with clinical correlation. Phlebology 2018; 33:213-214. [DOI: 10.1177/0268355517748251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Mark S Whiteley
- The Whiteley Clinic, Guildford, UK
- Faculty of Health and Biomedical Sciences, University of Surrey, Guildford, UK
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Sun JJ, Chowdhury MM, Sadat U, Hayes PD, Tang TY. Mechanochemical Ablation for Treatment of Truncal Venous Insufficiency: A Review of the Current Literature. J Vasc Interv Radiol 2017; 28:1422-1431. [PMID: 28811080 DOI: 10.1016/j.jvir.2017.07.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 07/03/2017] [Accepted: 07/04/2017] [Indexed: 10/19/2022] Open
Abstract
Mechanochemical ablation (MOCA) is a nonthermal nontumescent technique used in the treatment of superficial venous disease. This review analyzed the available data on the efficacy and safety of MOCA. A systematic literature search was performed. Of 101 studies identified, 14 were suitable for inclusion. The studies were found to be heterogeneous in design, and the quality of evidence was found to be low or very low. MOCA was demonstrated to be effective in the short-term with minimal complications. Consensus guidelines and definitions of reporting outcome measures must be standardized to allow comparison with other techniques.
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Affiliation(s)
- James J Sun
- Cambridge Vascular Unit, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Mohammed M Chowdhury
- Cambridge Vascular Unit, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Umar Sadat
- Cambridge Vascular Unit, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Paul D Hayes
- Cambridge Vascular Unit, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Tjun Y Tang
- Vascular Service, Department of General Surgery, Changi General Hospital, 2 Simei Street, Singapore 529889, Singapore.
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Dabbs EB, Dos Santos SJ, Shiangoli I, Holdstock JM, Beckett D, Whiteley MS. Pelvic venous reflux in males with varicose veins and recurrent varicose veins. Phlebology 2017; 33:382-387. [PMID: 28857674 DOI: 10.1177/0268355517728667] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objectives To report on a male cohort with pelvic vein reflux and associated primary and recurrent lower limb varicose veins. Methods Full lower limb duplex ultrasonography revealed significant pelvic contribution in eight males presenting with bilateral lower limb varicose veins. Testicular and internal iliac veins were examined with either one or a combination of computed tomography, magnetic resonance venography, testicular, transabdominal or transrectal duplex ultrasonography. Subsequently, all patients received pelvic vein embolisation, prior to leg varicose vein treatment. Results Pelvic vein reflux was found in 23 of the 32 truncal pelvic veins and these were treated by pelvic vein embolisation. Four patients have since completed their leg varicose vein treatment and four are undergoing leg varicose vein treatments currently. Conclusion Pelvic vein reflux contributes towards lower limb venous insufficiency in some males with leg varicose veins. Despite the challenges, we suggest that pelvic vein reflux should probably be investigated and pelvic vein embolisation considered in such patients.
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Affiliation(s)
| | - Scott J Dos Santos
- 1 The Whiteley Clinic, Guildford, Surrey, UK.,2 Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
| | - Irenie Shiangoli
- 1 The Whiteley Clinic, Guildford, Surrey, UK.,2 Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
| | | | - David Beckett
- 1 The Whiteley Clinic, Guildford, Surrey, UK.,3 Department of Radiology, Royal Bournemouth Hospital, Bournemouth, UK
| | - Mark S Whiteley
- 1 The Whiteley Clinic, Guildford, Surrey, UK.,2 Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
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Dabbs EB, Dos Santos SJ, Mainsiouw LE, Sheikh AA, Gkantiragas A, Shiangoli I, Watkins MR, Nemchand JL, Whiteley MS. Implication of foam sclerosant inactivation by human whole blood in a laboratory setting. Phlebology 2017; 33:338-343. [PMID: 28516808 DOI: 10.1177/0268355517708468] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background During sclerotherapy, it has been recommended to confirm intravenous placement of the needle by aspirating blood into the sclerosant syringe. This may inactivate some, or all of the sclerosant. Aims To quantify the volume of human blood needed to completely inactivate 1 ml of sodium tetradecyl sulphate, and comparing fresh blood and blood that has been stored in an ethylenediaminetetraacetic acid tube. Methods A series of manual titrations were carried out following a procedure developed at STD Pharmaceutical Products Ltd (Hereford, UK) and listed in the British Pharmacopeia. Three percent of sodium tetradecyl sulphate stock solutions were made with increasing volumes of blood and titrated against benzethonium chloride to determine the active concentration (% w/v) of sodium tetradecyl sulphate remaining in the solution. Results A calculated approximation showed 0.3 ml of blood is required to fully inactivate 1 ml of 3% sodium tetradecyl sulphate when made into a foam. A comparison was made between the use of fresh blood and blood stored in ethylenediaminetetraacetic acid tubes. Blood stored in ethylenediaminetetraacetic acid tubes showed more inactivation of sodium tetradecyl sulphate, but this was not significant at the P ≤ 0.05 level. Conclusion The data from our study have shown that a minimum of 0.3 ml of fresh blood is required to inactivate 1 ml of 3% sodium tetradecyl sulphate as a foam and it is not significantly affected by storing blood in an ethylenediaminetetraacetic acid tube. Our methodology suggests that during foam sclerotherapy treatment, blood should not be aspirated into the syringe to confirm position, and that ultrasound guidance is more appropriate for needle placement.
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Affiliation(s)
| | - Scott J Dos Santos
- 1 The Whiteley Clinic, Surrey, UK
- 2 Faculty of Health and Medical Sciences, University of Surrey, Surrey, UK
| | | | | | | | | | | | - Jaya L Nemchand
- 1 The Whiteley Clinic, Surrey, UK
- 2 Faculty of Health and Medical Sciences, University of Surrey, Surrey, UK
| | - Mark S Whiteley
- 1 The Whiteley Clinic, Surrey, UK
- 2 Faculty of Health and Medical Sciences, University of Surrey, Surrey, UK
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Mechanochemical ablation causes endothelial and medial damage to the vein wall resulting in deeper penetration of sclerosant compared with sclerotherapy alone in extrafascial great saphenous vein using an ex vivo model. J Vasc Surg Venous Lymphat Disord 2017; 5:370-377. [PMID: 28411705 DOI: 10.1016/j.jvsv.2016.12.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 12/25/2016] [Indexed: 01/22/2023]
Abstract
BACKGROUND Nonthermal, tumescentless devices are the next generation of minimally invasive devices to treat varicose veins. We aimed to investigate the effects of mechanochemical ablation (MOCA) using ClariVein (Vascular Insights, Quincy, Mass) on ex vivo great saphenous vein with histology and immunofluorescent staining. METHODS Extrafascial great saphenous veins were harvested during surgery for varicose veins and were treated ex vivo for 10 to 11 minutes with either liquid sclerotherapy or the use of ClariVein, with and without 3% sodium tetradecyl sulfate. Veins were sectioned and subjected to hematoxylin and eosin staining and immunofluorescent staining for endothelial and smooth muscle cell markers (CD31 and α-actin) to assess overall damage and cell death in the vein wall compared with control sections. RESULTS Histologic observations confirmed intimal damage from ClariVein, as has been previously shown; however, medial damage was also evident, which was not observed in control or liquid sclerotherapy sections. Immunofluorescent staining in the three sections studied showed a 42% decrease in CD31 staining and 27% mean reduction in α-actin staining up to a depth of 300 μm with liquid sclerotherapy. This cytotoxic effect was significantly enhanced by MOCA with a reduction in CD31 staining just above 60% and a 46% mean decrease in α-actin staining noted up to a depth of 300 μm. Far greater reductions in staining compared with sclerotherapy were observed up to a depth of 600 μm. CONCLUSIONS MOCA using 3% sodium tetradecyl sulfate increases the penetration of the sclerosant and its effect into the vein wall and shows superior rates of tissue destruction compared with liquid sclerotherapy alone. In this model, it appears not solely to damage the endothelium but also to shear the medial layer, creating small lesions into which sclerosant can flow and exert its cytotoxic effect.
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Boersma D, van Haelst S, van Eekeren R, Vink A, Reijnen M, de Vries J, de Borst G. Macroscopic and Histologic Analysis of Vessel Wall Reaction After Mechanochemical Endovenous Ablation Using the ClariVein OC Device in an Animal Model. Eur J Vasc Endovasc Surg 2017; 53:290-298. [DOI: 10.1016/j.ejvs.2016.11.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 11/25/2016] [Indexed: 01/17/2023]
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Witte ME, Holewijn S, van Eekeren RR, de Vries JP, Zeebregts CJ, Reijnen MMPJ. Midterm Outcome of Mechanochemical Endovenous Ablation for the Treatment of Great Saphenous Vein Insufficiency. J Endovasc Ther 2016; 24:149-155. [PMID: 27742900 DOI: 10.1177/1526602816674455] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE To report the midterm results of mechanochemical ablation (MOCA) for treating great saphenous vein (GSV) insufficiency. METHODS In a 1-year period, 85 consecutive patients (median age 51.4 years; 71 women) undergoing MOCA with polidocanol in 104 limbs were enrolled in a prospective registry. The patients were evaluated at baseline and during follow-up (4 weeks and 1, 2, and 3 years) using duplex ultrasound, the CEAP (clinical, etiologic, anatomic and pathophysiologic) classification, the Venous Clinical Severity Score (VCSS), the RAND Short Form 36-Item Health Survey (RAND-SF36), and the Aberdeen Varicose Vein Questionnaire (AVVQ). Primary outcome measures were clinical and anatomic success. Secondary outcome measures included general and disease-specific quality of life and reinterventions. RESULTS Technical success (99%) was achieved in all but 1 patient in whom technical problems with the device led to conversion to another method for treatment of 2 limbs. After a median follow-up of 36 months (interquartile range 12.5, 46.3), recanalization occurred in 15 (15%) of 102 successfully treated vein segments. Anatomic success was 92%, 90%, and 87% after 1, 2, and 3 years, respectively. The VCSS improved at all time intervals compared to the preprocedure median. The clinical success at 3 years was 83%. The AVVQ and RAND-SF36 scores showed an improvement at all time intervals compared to baseline values. Between 12 and 36 months, however, a significant deterioration was observed in VCSS, which was accompanied by worsening of disease-specific and general quality of life. CONCLUSION In the longest follow-up of MOCA to date, this study shows MOCA to be an effective treatment modality for GSV insufficiency at midterm follow-up, but clinical results seem to drop over time.
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Affiliation(s)
- Marianne E Witte
- 1 Department of Surgery, Rijnstate Hospital, Arnhem, the Netherlands
| | - Suzanne Holewijn
- 1 Department of Surgery, Rijnstate Hospital, Arnhem, the Netherlands
| | | | | | - Clark J Zeebregts
- 3 Department of Surgery, Division of Vascular Surgery, University Medical Center Groningen, University of Groningen, the Netherlands
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Whiteley M. Letter regarding embolization is not essential in the treatment of leg varices due to pelvic venous insufficiency. Phlebology 2016; 31:588. [DOI: 10.1177/0268355516647319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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