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Wiske C, Chervonski E, Rockman CB, Jacobowitz GR, Sadek M. Venous ablation procedures by provider type, including advanced practice providers. J Vasc Surg Venous Lymphat Disord 2024; 12:101872. [PMID: 38518987 DOI: 10.1016/j.jvsv.2024.101872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/17/2024] [Accepted: 03/07/2024] [Indexed: 03/24/2024]
Abstract
OBJECTIVE The necessary training and certification of providers performing venous ablation has become a topic of debate in recent years. As venous interventions have shifted away from the hospital, the diversity of provider backgrounds has increased. We aimed to characterize superficial venous ablation practice patterns associated with different provider types. METHODS We analyzed Medicare Fee-For-Service data from 2010 through 2018. Procedures were identified by their Current Procedural Terminology code and included radiofrequency ablation, endovenous laser ablation, chemical adhesive ablation (ie, VenaSeal; Medtronic, Inc), and mechanochemical ablation. These procedures were correlated with the practitioner type to identify provider-specific trends. RESULTS Between 2010 and 2018, the number of ablation procedures increased by 107% from 114,197 to 236,558 per year (P < .001). Most procedures were performed by surgeons without vascular board certification (28.7%; 95% confidence interval [CI], 28.7%-28.8%), followed by vascular surgeons (27.1%; 95% CI, 27.0%-27.2%). Traditionally noninterventional specialties, which exclude surgeons, cardiologists, and interventional radiologists, accounted for 14.1% (95% CI, 14.1%-14.2%), and APPs accounted for 3.5% (95% CI, 3.4%-3.5%) of all ablation procedures during the study period. The total number of ablations increased by 9.7% annually (95% CI, 9.7%-9.8%), whereas procedures performed by APPs increased by 62.0% annually (95% CI, 61.6%-62.4%). There were significant differences between specialties in the use of nonthermal ablation modalities: APPs had the highest affinity for nonthermal ablation (odds ratio [OR], 2.60; 95% CI, 2.51-2.69). Cardiologists were also more likely to use nonthermal ablation (OR, 1.62; 95% CI, 1.59-1.66). Similarly, the uptake of new nonthermal technology (ie, chemical adhesives) was greatest among APPs (OR, 3.57; 95% CI, 3.43-3.70) and cardiologists (OR, 1.86; 95% CI, 1.81-1.91). Vascular surgeons were less likely to use nonthermal modalities (OR, 0.95; 95% CI, 0.92-0.97), including new nonthermal technology in the first year of availability (OR, 0.93; 95% CI, 0.90-0.95). CONCLUSIONS The use of venous procedures has increased rapidly during the past decade, particularly as endovenous ablations have been performed by a wider practitioner base, including APPs and noninterventionalists. Practice patterns differ by provider type, with APPs and cardiologists skewing more toward nonthermal modalities, including more rapid uptake of new nonthermal technology. Provider-specific biases for specific ablation modalities might reflect differences in training, skill set, the need for capital equipment, clinical privileges, or reimbursement. These data could help to inform training paradigms, the allocation of resources, and evaluation of appropriateness in a real-world setting.
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Affiliation(s)
- Clay Wiske
- Division of Vascular & Endovascular Surgery, Department of Surgery, New York University Langone Health, New York, NY; Division of Vascular & Endovascular Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA.
| | | | - Caron B Rockman
- Division of Vascular & Endovascular Surgery, Department of Surgery, New York University Langone Health, New York, NY
| | - Glenn R Jacobowitz
- Division of Vascular & Endovascular Surgery, Department of Surgery, New York University Langone Health, New York, NY
| | - Mikel Sadek
- Division of Vascular & Endovascular Surgery, Department of Surgery, New York University Langone Health, New York, NY
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McGeoch CLB, Steinberg RS, Bortfeld KS, Almuwaqqat Z, Rheudasil JM, Bhatia NK, Cutchins AC. Radiofrequency venous ablation for symptomatic relief in postural orthostatic tachycardia syndrome: a case series. Eur Heart J Case Rep 2024; 8:ytae029. [PMID: 38328599 PMCID: PMC10849078 DOI: 10.1093/ehjcr/ytae029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 01/08/2024] [Accepted: 01/19/2024] [Indexed: 02/09/2024]
Abstract
Background Hypovolemic postural orthostatic tachycardia syndrome (POTS) is thought to be caused by dysregulated circulating blood volume. Management is mainly limited to symptom-targeted lifestyle changes. Radiofrequency venous ablation (RFA) represents a minimally invasive method of increasing circulating blood volume. The following case series describes a novel application of RFA to successfully target POTS symptoms in patients demonstrating venous insufficiency. The use of RFA in alleviating POTS symptoms has not previously been reported. Case summary We describe four patients with either a well-established historical POTS diagnosis or dysautonomia symptoms refractory to both medical management and lifestyle modifications. They all demonstrated venous reflux on lower extremity venous ultrasound testing. Upon vascular surgery referral, all underwent great and small saphenous vein RFA. They each subsequently reported subjective improvement in their dysautonomia symptoms and quality-of-life. Two with symptom recurrence years later were found to have new-onset pelvic venous congestion and are being evaluated for pelvic venous insufficiency interventions. Discussion Lower extremity venous pooling can exacerbate dysautonomia symptoms in POTS patients. Patients refractory to conventional treatment strategies should undergo venous insufficiency workup, and if positive, should be referred for venous pooling intervention evaluation. The success of RFA at treating refractory POTS symptoms in these four patients with lower extremity venous reflux, including no surgical intervention and no adverse effects, are compelling grounds to further explore this therapy and to quantify and standardize symptom improvement assessment in a larger patient population. Future directions include a demonstration of quality-of-life improvement in randomized clinical trials.
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Affiliation(s)
| | - Rebecca S Steinberg
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Kristina S Bortfeld
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Zakaria Almuwaqqat
- Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
| | - J Mark Rheudasil
- Department of Surgery, Division of Vascular Surgery and Endovascular Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Neal K Bhatia
- Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
| | - Alexis C Cutchins
- Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
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Kuyumcu G, Salazar GM, Prabhakar AM, Ganguli S. Minimally invasive treatments for perforator vein insufficiency. Cardiovasc Diagn Ther 2016; 6:593-598. [PMID: 28123979 DOI: 10.21037/cdt.2016.11.12] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Incompetent superficial veins are the most common cause of lower extremity superficial venous reflux and varicose veins; however, incompetent or insufficient perforator veins are the most common cause of recurrent varicose veins after treatment, often unrecognized. Perforator vein insufficiency can result in pain, skin changes, and skin ulcers, and often merit intervention. Minimally invasive treatments have replaced traditional surgical treatments for incompetent perforator veins. Current minimally invasive treatment options include ultrasound guided sclerotherapy (USGS) and endovascular thermal ablation (EVTA) with either laser or radiofrequency energy sources. Advantages and disadvantages of each modality and knowledge on these treatments are required to adequately address perforator venous disease.
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Affiliation(s)
- Gokhan Kuyumcu
- Cleveland Clinic Imaging Institute, Cleveland, OH 44195, USA
| | - Gloria Maria Salazar
- Division of Interventional Radiology, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Anand M Prabhakar
- Division of Interventional Radiology, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Suvranu Ganguli
- Division of Interventional Radiology, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
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Lazarides MK. Venous Ulcers: The Benefits of Superficial Venous Surgery Should Not Be Overlooked. INT J LOW EXTR WOUND 2016; 4:198-9. [PMID: 16286370 DOI: 10.1177/1534734605283524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Brittenden J, Cotton SC, Elders A, Tassie E, Scotland G, Ramsay CR, Norrie J, Burr J, Francis J, Wileman S, Campbell B, Bachoo P, Chetter I, Gough M, Earnshaw J, Lees T, Scott J, Baker SA, MacLennan G, Prior M, Bolsover D, Campbell MK. Clinical effectiveness and cost-effectiveness of foam sclerotherapy, endovenous laser ablation and surgery for varicose veins: results from the Comparison of LAser, Surgery and foam Sclerotherapy (CLASS) randomised controlled trial. Health Technol Assess 2015; 19:1-342. [PMID: 25858333 DOI: 10.3310/hta19270] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Foam sclerotherapy (foam) and endovenous laser ablation (EVLA) have emerged as alternative treatments to surgery for patients with varicose veins, but uncertainty exists regarding their effectiveness in the medium to longer term. OBJECTIVES To assess the clinical effectiveness and cost-effectiveness of foam, EVLA and surgery for the treatment of varicose veins. DESIGN A parallel-group randomised controlled trial (RCT) without blinding, and economic modelling evaluation. SETTING Eleven UK specialist vascular centres. PARTICIPANTS Seven hundred and ninety-eight patients with primary varicose veins (foam, n = 292; surgery, n = 294; EVLA, n = 212). INTERVENTIONS Patients were randomised between all three treatment options (eight centres) or between foam and surgery (three centres). PRIMARY OUTCOME MEASURES Disease-specific [Aberdeen Varicose Vein Questionnaire (AVVQ)] and generic [European Quality of Life-5 Dimensions (EQ-5D), Short Form questionnaire-36 items (SF-36) physical and mental component scores] quality of life (QoL) at 6 months. Cost-effectiveness as cost per quality-adjusted life-year (QALY) gained. SECONDARY OUTCOME MEASURES Quality of life at 6 weeks; residual varicose veins; Venous Clinical Severity Score (VCSS); complication rates; return to normal activity; truncal vein ablation rates; and costs. RESULTS The results appear generalisable in that participants' baseline characteristics (apart from a lower-than-expected proportion of females) and post-treatment improvement in outcomes were comparable with those in other RCTs. The health gain achieved in the AVVQ with foam was significantly lower than with surgery at 6 months [effect size -1.74, 95% confidence interval (CI) -2.97 to -0.50; p = 0.006], but was similar to that achieved with EVLA. The health gain in SF-36 mental component score for foam was worse than that for EVLA (effect size 1.54, 95% CI 0.01 to 3.06; p = 0.048) but similar to that for surgery. There were no differences in EQ-5D or SF-36 component scores in the surgery versus foam or surgery versus EVLA comparisons at 6 months. The trial-based cost-effectiveness analysis showed that, at 6 months, foam had the highest probability of being considered cost-effective at a ceiling willingness-to-pay ratio of £20,000 per QALY. EVLA was found to cost £26,107 per QALY gained versus foam, and was less costly and generated slightly more QALYs than surgery. Markov modelling using trial costs and the limited recurrence data available suggested that, at 5 years, EVLA had the highest probability (≈ 79%) of being cost-effective at conventional thresholds, followed by foam (≈ 17%) and surgery (≈ 5%). With regard to secondary outcomes, health gains at 6 weeks (p < 0.005) were greater for EVLA than for foam (EQ-5D, p = 0.004). There were fewer procedural complications in the EVLA group (1%) than after foam (7%) and surgery (8%) (p < 0.001). Participants returned to a wide range of behaviours more quickly following foam or EVLA than following surgery (p < 0.05). There were no differences in VCSS between the three treatments. Truncal ablation rates were higher for surgery (p < 0.001) and EVLA (p < 0.001) than for foam, and were similar for surgery and EVLA. CONCLUSIONS Considerations of both the 6-month clinical outcomes and the estimated 5-year cost-effectiveness suggest that EVLA should be considered as the treatment of choice for suitable patients. FUTURE WORK Five-year trial results are currently being evaluated to compare the cost-effectiveness of foam, surgery and EVLA, and to determine the recurrence rates following each treatment. This trial has highlighted the need for long-term outcome data from RCTs on QoL, recurrence rates and costs for foam sclerotherapy and other endovenous techniques compared against each other and against surgery. TRIAL REGISTRATION Current Controlled Trials ISRCTN51995477. FUNDING This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 19, No. 27. See the NIHR Journals Library website for further project information.
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Affiliation(s)
- Julie Brittenden
- Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | | | - Andrew Elders
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Emma Tassie
- Health Economics Research Unit, University of Aberdeen, Aberdeen, UK
| | - Graham Scotland
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Craig R Ramsay
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - John Norrie
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Jennifer Burr
- School of Medicine, University of St Andrews, St Andrews, UK
| | - Jill Francis
- School of Health Sciences, City University London, London, UK
| | - Samantha Wileman
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Bruce Campbell
- Department of Vascular Surgery, Royal Devon and Exeter Hospital (Wonford), Exeter, UK
| | - Paul Bachoo
- Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - Ian Chetter
- Department of Vascular Surgery, Hull Royal Infirmary, Hull, UK
| | - Michael Gough
- Vascular Surgery, St James University Hospital, Leeds, UK
| | | | - Tim Lees
- Vascular Surgery, Freeman Hospital, Newcastle upon Tyne, UK
| | - Julian Scott
- Vascular Surgery, St James University Hospital, Leeds, UK
| | - Sara A Baker
- Vascular Surgical Unit, Royal Bournemouth Hospital, Bournemouth, UK
| | - Graeme MacLennan
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Maria Prior
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
| | - Denise Bolsover
- Health Services Research Unit, University of Aberdeen, Aberdeen, UK
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Zhan HT, Bush RL. A review of the current management and treatment options for superficial venous insufficiency. World J Surg 2015; 38:2580-8. [PMID: 24803347 DOI: 10.1007/s00268-014-2621-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The recognition of lower extremity venous disease as a significant cause of morbidity and lower quality of life, afflicting up to 25 % of Western populations, has led to rapid and drastic improvements in treatment options as well as an increasing awareness of the disease. Superficial venous disease, a frequent medical problem encountered in clinical practices, is now a common reason for referral to providers offering a spectrum of interventions. Venous guidelines have been set forth by the American Venous Forum and Society for Vascular Surgery covering simple spider veins to chronic venous ulcerations. (Gloviczki et al. J Vas Surg 53:2S-48S, 2011) This review provides an overview of the modern management of varicose veins and venous insufficiency.
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Affiliation(s)
- Henry T Zhan
- Texas A&M Health Science Center, MS 1359, 8447 State Highway 47, HPEB 3064, Bryan, TX, 77807-3260, USA
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7
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Venous disease in women: epidemiology, manifestations, and treatment. J Vasc Surg 2013; 57:37S-45S. [PMID: 23522716 DOI: 10.1016/j.jvs.2012.10.121] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 08/02/2012] [Accepted: 10/26/2012] [Indexed: 11/21/2022]
Abstract
Until the past decade, venous disease was commonly underdiagnosed and undertreated due to lack of interest on the part of providers and to reluctance to undergo procedures on the part of patients. Modern venous interventions, improved diagnostic modalities, and increased awareness through education, training, and screening programs have all raised enthusiasm for venous disease in recent years. This has been crucial to gain control over a disease that affects a significant proportion of the population, with women being affected more than men. This article will discuss epidemiologic studies that highlight some of the gender-related issues and review the risk factors for venous disease. We will also discuss the physiologic venous changes that occur with pregnancy and highlight functional venous disease in women. Finally, we will review the indications for and treatment of superficial venous disease.
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Lee JM, Jung IM, Chung JK. Clinical and duplex-sonographic outcomes of 1,320-nm endovenous laser treatment for saphenous vein incompetence. Dermatol Surg 2012; 38:1704-9. [PMID: 22804975 DOI: 10.1111/j.1524-4725.2012.02506.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Endovenous laser treatment (EVLT) can be performed using different wavelengths with different absorption rates and characteristics, but limited data are available regarding wavelength-related side effects and efficacy. OBJECTIVE To evaluate the safety and efficacy of 1,320-nm EVLT for treating saphenous vein incompetence. METHODS AND MATERIALS A 1-year retrospective study was performed using clinical and Duplex-sonographic follow-up data from patients treated using an 810-nm or 1,320-nm laser. RESULTS The difference in clinical improvement after EVLT between the two groups was statistically significant. Improvement in venous clinical severity score (VCSS) was greater in the 1,320-nm group than in the 810-nm group, but improvement in Aberdeen Varicose Vein Severity Score was not statistically significantly different between the two groups. Ultrasonography-proven recanalization rates 1 year after surgery were 11.1% for the 810-nm group and 6.5% for the 1,320 nm group (p < .05). CONCLUSION EVLT using a 1,320-nm laser had better clinical outcomes and lower recurrence and recanalization rates than EVLT with an 810-nm laser.
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Affiliation(s)
- Jeong M Lee
- Department of Surgery, College of Medicine, Seoul National University, Seoul, Korea
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Helmy ElKaffas K, ElKashef O, ElBaz W. Great saphenous vein radiofrequency ablation versus standard stripping in the management of primary varicose veins-a randomized clinical trial. Angiology 2010; 62:49-54. [PMID: 20724299 DOI: 10.1177/0003319710380680] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
INTRODUCTION Chronic venous insufficiency is the most common vascular disease in the adult population. However, randomized clinical trials (RCTs) comparing therapeutic options are limited. PATIENTS AND METHODS A total of 180 patients with saphenofemoral junction and great saphenous reflux detected on duplex were randomized to either ultrasound-guided radiofrequency ablation (RFA) or standard surgical treatment. The study participants blindly chose an assignment card that placed them in either group A (ultrasound-guided RFA of the great saphenous vein [GSV]; n = 90); or group B (surgical management n = 90). Patients were followed up for 24 months. RESULTS The primary occlusion rate in group A was 94.5% versus 100% in group B. Radiofrequency ablation had a lower overall complication rate (P = .02) and shorter post-intervention hospital stay (P = .001). Kaplan-Meier analysis showed no significant differences in recurrence rates at 24 months follow-up (P = .45). Radiofrequency ablation was significantly more expensive (P = .003). CONCLUSION Great saphenous vein occlusion was achieved efficiently in 94% of our group using RFA with minimal complications and obvious advantages as compared to standard surgery.
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10
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Implementation of Endovenous Laser Ablation for Varicose Veins in a Large Community Hospital: The First 400 Procedures. Eur J Vasc Endovasc Surg 2009; 37:486-91. [DOI: 10.1016/j.ejvs.2008.11.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 11/16/2008] [Indexed: 11/21/2022]
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Brasic N, Lopresti D, McSwain H. Endovenous Laser Ablation and Sclerotherapy for Treatment of Varicose Veins. ACTA ACUST UNITED AC 2008; 27:264-75. [DOI: 10.1016/j.sder.2008.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Jung IM, Min SI, Heo SC, Ahn YJ, Hwang KT, Chung JK. Combined endovenous laser treatment and ambulatory phlebectomy for the treatment of saphenous vein incompetence. Phlebology 2008; 23:172-7. [DOI: 10.1258/phleb.2008.008002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Objectives The aim of this retrospective study is to assess the safety and effectiveness of endovenous laser treatment (EVLT) combined with ambulatory phlebectomy (AP) as a single procedure for treating saphenous vein incompetence. Methods The study enrolled 148 patients with saphenofemoral or saphenopopliteal junction reflux associated with saphenous vein incompetence and enlarged branch veins. Patients were treated with EVLT (135 great saphenous veins, 41 small saphenous veins) concomitantly with AP as a single procedure. All patients were followed up by clinical assessment and duplex ultrasound at one week and 12 weeks after the procedure. Results No postprocedural deep vein thrombosis and pulmonary embolism occurred. Saphenous vein recanalization rate at three months was 5.7%. Residual varicosities were found in 11.4% of the patients at three months after procedure, but only 2.3% of those required subsequent interventions. Conclusion Combined EVLT and AP could be a safe and effective treatment modality for the saphenous vein incompetence.
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Affiliation(s)
- I M Jung
- Department of Surgery, Seoul National University Boramae Hospital
| | - S I Min
- Department of Surgery, Seoul National University College of Medicine, Seoul,
Korea
| | - S C Heo
- Department of Surgery, Seoul National University Boramae Hospital
| | - Y J Ahn
- Department of Surgery, Seoul National University Boramae Hospital
| | - K-T Hwang
- Department of Surgery, Seoul National University Boramae Hospital
| | - J K Chung
- Department of Surgery, Seoul National University Boramae Hospital
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Mordon SR, Wassmer B, Zemmouri J. Mathematical modeling of 980-nm and 1320-nm endovenous laser treatment. Lasers Surg Med 2007; 39:256-65. [PMID: 17252577 DOI: 10.1002/lsm.20476] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND AND OBJECTIVES Endovenous laser treatment (ELT) has been proposed as an alternative in the treatment of reflux of the great saphenous vein (GSV) and small saphenous vein (SSV). Numerous studies have since demonstrated that this technique is both safe and efficacious. ELT was presented initially using diode lasers of 810 nm, 940 nm, and 980 nm. Recently, a 1,320-nm Nd:YAG laser was introduced for ELT. This study aims to provide mathematical modeling of ELT in order to compare 980 nm and 1,320 nm laser-induced damage of saphenous veins. STUDY DESIGN/MATERIALS AND METHODS The model is based on calculations describing light distribution using the diffusion approximation of the transport theory, the temperature rise using the bioheat equation, and the laser-induced injury using the Arrhenius damage model. The geometry to simulate ELT was based on a 2D model consisting of a cylindrically symmetric blood vessel including a vessel wall and surrounded by an infinite homogenous tissue. The mathematical model was implemented using the Macsyma-Pdease2D software (Macsyma, Inc., Arlington, MA). Calculations were performed so as to determine the damage induced in the intima tunica, the externa tunica and inside the peri-venous tissue for 3 mm and 5 mm vessels (considered after tumescent anesthesia) and different linear endovenous energy densities (LEED) usually reported in the literature. RESULTS Calculations were performed for two different vein diameters: 3 mm and 5 mm and with LEED typically reported in the literature. For 980 nm, LEED: 50 to 160 J/cm (CW mode, 2 mm/second pullback speed, power: 10 W to 32 W) and for 1,320 nm, LEED: 50 to 80 J/cm (pulsed mode, pulse duration 1.2 milliseconds, peak power: 135 W, repetition rate 30 Hz to 50 Hz). DISCUSSION AND CONCLUSION Numerical simulations are in agreement with LEED reported in clinical studies. Mathematical modeling shows clearly that 1,320 nm, with a better absorption by the vessel wall, requires less energy to achieve wall damage. In the 810-1,320-nm range, blood plays only a minor role. Consequently, the classification of these lasers into hemoglobin-specific laser wavelengths (810, 940, 980 nm) and water-specific laser wavelengths (1,320 nm) is inappropriate. In terms of closure rate, 980 nm and 1,320 nm can lead to similar results and, as reported by the literature, to similar side effects. This model should serve as a useful tool to simulate and better understand the mechanism of action of the ELT.
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Affiliation(s)
- Serge R Mordon
- INSERM (French National Institute of Health and Medical Research), Lille University Hospital, Lille, France.
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Wassmer B, Zemmouri J, Mordon SR. Modélisation mathématique du traitement par laser endoveineux (LEV). Ing Rech Biomed 2007. [DOI: 10.1016/j.rbmret.2007.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Mekako A, Hatfield J, Bryce J, Heng M, Lee D, McCollum P, Chetter I. Combined endovenous laser therapy and ambulatory phlebectomy: refinement of a new technique. Eur J Vasc Endovasc Surg 2006; 32:725-9. [PMID: 16863696 DOI: 10.1016/j.ejvs.2006.06.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2006] [Accepted: 06/04/2006] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Sclerotherapy (IS) or ambulatory phlebectomy (AP) are required as subsequent interventions in majority of cases following endovenous laser therapy (EVLT). We assessed whether AP performed concomitantly with EVLT (EVLTAP), is effective, acceptable, and reduces subsequent requirement for interventions. METHOD 67 patients (70 limbs) with great saphenous varicosities underwent EVLTAP. Pain was assessed on days 1, 4 and 7 using a visual analogue scale (VAS) of 0 to 10. Clinical and ultrasound assessments were done at 1, 6 and 12 weeks (no ultrasound at 6 weeks). Residual varicosities underwent further AP or IS. Patients' satisfaction with the cosmetic outcome and overall treatment was assessed at 12 weeks using a VAS rating. RESULTS 49 patients (70%) completed follow-up. Median pain scores were 1.6 (IQR 0.2-4.8), 0.3 (0-1.4) and 0.2 (0-1.1) on days 1, 4 and 7 respectively. Ultrasound demonstrated 69 (99%) and 47 (96%) occluded long saphenous veins at 1 and 12 weeks respectively. Subsequent IS or AP was performed on 3 (4%) or 1 (1%) limbs respectively. Cosmetic satisfaction was 9.6 (IQR 8.9-10) and overall satisfaction 9.8 (IQR 9.3-10). CONCLUSION EVLTAP produces excellent results, is feasible and acceptable, and obviates need for subsequent procedures in the short-term.
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Affiliation(s)
- A Mekako
- Academic Vascular Surgery Unit, Hull Royal Infirmary, Hull, UK.
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16
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Mordon SR, Wassmer B, Zemmouri J. Mathematical modeling of endovenous laser treatment (ELT). Biomed Eng Online 2006; 5:26. [PMID: 16638133 PMCID: PMC1464132 DOI: 10.1186/1475-925x-5-26] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Accepted: 04/25/2006] [Indexed: 11/11/2022] Open
Abstract
Background and objectives Endovenous laser treatment (ELT) has been recently proposed as an alternative in the treatment of reflux of the Great Saphenous Vein (GSV) and Small Saphenous Vein (SSV). Successful ELT depends on the selection of optimal parameters required to achieve an optimal vein damage while avoiding side effects. Mathematical modeling of ELT could provide a better understanding of the ELT process and could determine the optimal dosage as a function of vein diameter. Study design/materials and methods The model is based on calculations describing the light distribution using the diffusion approximation of the transport theory, the temperature rise using the bioheat equation and the laser-induced injury using the Arrhenius damage model. The geometry to simulate ELT was based on a 2D model consisting of a cylindrically symmetric blood vessel including a vessel wall and surrounded by an infinite homogenous tissue. The mathematical model was implemented using the Macsyma-Pdease2D software (Macsyma Inc., Arlington, MA, USA). Damage to the vein wall for CW and single shot energy was calculated for 3 and 5 mm vein diameters. In pulsed mode, the pullback distance (3, 5 and 7 mm) was considered. For CW mode simulation, the pullback speed (1, 2, 3 mm/s) was the variable. The total dose was expressed as joules per centimeter in order to perform comparison to results already reported in clinical studies. Results In pulsed mode, for a 3 mm vein diameter, irrespective of the pullback distance (2, 5 or 7 mm), a minimum fluence of 15 J/cm is required to obtain a permanent damage of the intima. For a 5 mm vein diameter, 50 J/cm (15W-2s) is required. In continuous mode, for a 3 mm and 5 mm vein diameter, respectively 65 J/cm and 100 J/cm are required to obtain a permanent damage of the vessel wall. Finally, the use of different wavelengths (810 nm or 980 nm) played only a minor influence on these results. Discussion and conclusion The parameters determined by mathematical modeling are in agreement with those used in clinical practice. They confirm that thermal damage of the inner vein wall (tunica intima) is required to achieve the tissue alterations necessary in order to lead the vein to permanent occlusion. However, in order to obtain a high rate of success without adverse events, the knowledge of the vein diameter after tumescent anesthesia is recommended in order to use the optimal energy. As clearly demonstrated by our calculations, both pulsed and continuous mode operations of the laser can be efficient. An interesting observation in our model is that less amount of energy is required in pulsed mode than in continuous mode. Damaging the vein sequentially along its entire length may lead to permanent occlusion. However, the pulsed mode requires a very precise positioning of the fiber after each pullback and the duration of the treatment is much longer. For these reasons, continuous irradiation seems to be preferred by most clinicians. This model should serve as a useful tool to simulate and better understand the mechanism of action of the ELT
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Affiliation(s)
- Serge R Mordon
- INSERM (French National Institute of Health and Medical Research) IFR 114, Lille University Hospital, Lille, France
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A 2 years follow-up study of endovenous 980nm laser treatment of the great saphenous vein: Role of the blood content in the GSV. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.mla.2005.08.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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