Safety and Efficacy Study of Endovenous Microwave Ablation for Treatment of Varicose Veins

Study Overview
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Brief Summary
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The purpose of this study was to evaluate the efficacy and safety of microwave ablation catheter in the treatment of varicose veins in lower extremities,meanwhile, to compare the quality of subjects'lives before and after treatment.

Detailed Description
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The chronic venous insufficiency of lower extremities (chronic venous insufficiency, CVI) is a set of a series of clinical syndrome caused by venous reflux, common symptoms are heaviness, fatigue, swelling, burning sentation, itching, pain, etc.The main causes of superficial varicose veins are weakness of superficial vein wall, insufficiency or defect of vein valve closure and increased pressure inside veins.The weakness of venous wall, the decreasing of flexibility, venous valve defects the the poor structure, be related with genetic factor, belong to primary inferior venous valves' incomplete closure.The influencing factors of primary valve insufficiency include heavy physical labor, long standing or sitting work, obesity, pregnancy, chronic constipation, and chronic cough.Varicose veins secondary to a history of venous thrombosis of the lower extremities, venous system obstruction and increased venous pressure caused by circulating blood volume exceeding reflux load are secondary.When the valve of the great saphenous vein at the junction of the saphenous vein is damaged and closed incompletely, the valve function of the distal and perforating vein can be affected step by step, and the small saphenous vein can also be affected through its branch vein.Because the superficial vein wall's muscle layer is thin and their surrounding lackness of connective tissue, blood regurgitation can cause the venous lumen to thicken, tortuosity and lengthen, presenting as superficial varicose veins.Because of the severe venous pressure of lower extremity,the vascular permeability of football boots is increasing,resulting the appearance of a large number of blood capillary hyperplasia.Due to a large number of fibrinogen hindered the exchange between capillary and the surrounding tissue, the nutritional change of subcutaneous tissue occured,including skin pigmentation, eczema, dermatitis, subcutaneous lipid sclerosis and ulceration. The traditional treatments of lower extremity varicose veins,including high ligation and stripping of great saphenous vein,varicose vein's resection and ligation of perforating vein,can cause large trauma,huge pain,limitation of activity and long convalescence and aesthetic problems,etc.As a consequence,a variety of minimally invasive method with small wound,little pain and early recovery are prevalently applied in clinical, also achieved plenty of good therapeutic effect.According to the different mechanism of minimally invasive treatment, it can be divided into two categories: physical injury (laser closure, radiofrequency closure, microwave treatment, electrocoagulation, transparent direct rotation, laparoscopic great saphenous vein resection, etc.) and chemical injury (sclerosing agent injection). Clinical observation in our department found that the pain, bruising, numbness, and number of incisions after microwave ablation were all lower than those of traditional high position ligation and extraction with laser closure. The purpose of this study is to report a monocentricity, prospective Chinese experience using the ECO Varicose Veins Therapeutic Unit from ECO (Nanjing ECO Microwave System Co.Ltd) for Endovenous Microwave Ablation (EMA) to treat primary great and short saphenous vein reflux and to evaluate its safety, efficacy and life quality.

Official Title
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Safety and Efficacy Study of Endovenous Microwave Ablation for Treatment of Varicose Veins

Conditions
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Vascular Diseases, Peripheral, Venous Insufficiency of Leg, Varicose Veins of Lower Limb

Intervention / Treatment
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* Procedure: Questionnaires


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: - Age >18 years, and <90 years ,and able to understand the requirements of the study and provide informed consent and accept the exams and follow-up. C2 - C5 varicose veins / CVI Symptomatic primary GSV, SSV or AASV incompetence, with reflux >0.5 seconds on colour duplex, including one or more of the following symptoms: aching, throbbing, heaviness,fatigue, pruritus, night cramps, restlessness, generalized pain or discomfort, swelling. Patients who has GSV, SSV AASV diameters of 3mm to 12mm in the standing postition. Only one limb of each patient was included in the study. Exclusion Criteria: - Current DVT or history of DVT. Recurrent varicose veins. Pregnant patients. Arterial disease (ABPI <0.8). Patients who are unwilling to participate this test. Inability or unwillingness to complete questionnaires. Adverse reaction to sclerosant or cyanoacrylate. GSV, SSV or AASV severely tortuous. Infectious disease. Life expectancy < 1 year. Current, regular use of systemic anticoagulation (e.g. warfarin, heparin). Daily use of narcotic analgesia or NSAIDS to control pain associated with venous disease. The investigators determined that intravenous therapy was not appropriate.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Interventional Model Description: A total of 50 patients with varicose veins of lower extremities treated with microwave ablation catheter were selected to observe their venous closure rate and postoperative adverse reactions.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Microwave ablations<br>A total of 50 patients with varicose veins of lower extremities treated with microwave ablation catheter were selected to observe their annual venous closure rate and postoperative adverse reactions. | Procedure: Questionnaires<br>* Questionnaires to assess the quality of life (EQ-5D, CVVQ, CIVIQ, AVVQ, Patient satisfaction survey)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Technical Success at time of procedure | Use duplex ultrasound assess the occlusion of treated vein post-procedure,record the rate of occlusion of treated vein post-procedure | Immediately post-procedure | 
| Anatomical Success | Use duplex ultrasound verify the occlusion of treated vessel and record the rate of occlusion of treated vessel | 3days | 
| Anatomical Success | Use duplex ultrasound verify the occlusion of treated vessel and record the rate of occlusion of treated vessel | 12 months post-procedure | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Instrumental success | successful delivery of endovenous microwave ablation catheter in right place and successful withdrawal after microwave treatment is defined as Instrumental success | Immediately post-procedure | 
| Quality of Life score using EQ-5D questionnaire | EQ-5D is used to assess quality of life based on Mobility, Self-care, Usual Activities, Pain/Discomfort and Anxiety, rated at 5 levels: no problems, slight problems, moderate problems, severe problems, unable to perform activity. Inputs from this questionnaire is used to observe the changes in quality of life over the whole test procedure | Baseline, 1 month, 6 months and 12 months | 
| Quality of life score using the Chronic Venous Insufficiency Questionnaire(CIVIQ-14) | CIVIQ-14 is a questionnaire based on three dimensions - pain, physical and psychological, based on a scale from 1 to 5 (no trouble, slight, moderate, considerable, severe).Based on inputs, CIVIQ-14 will be tabulated, ranging from 0 to 100 - the higher the value, the poorer the quality of life.In order to observe the changes in quality of life over the whole test procedure. | Baseline, 1 month, 6 months and 12 months | 
| Quality of life score using the Aberdeen Varicose Veins Questionnaire (AVVQ) | To measure health status of varicose vein participants based on symptoms and impact on daily activities. A total score ranging from 0 to 30 will be tabulated, with 30 being worst quality of life.In order to observe the changes in quality of life over the whole test procedure. | Baseline, 1 month, 6 months and 12 months | 
| Clinical Change using Venous Clinical Severity Score (VCSS) | VCSS evaluates the severity of hallmarks of venous disease - 0 (none), 1 (Mild) , 2(Moderate), 3 (Severe).Record the score separately to observe the changes in quality of life over the whole test procedure. | Baseline, 1 month, 6 months and 12 months | 
| Time taken to return to work and normal activities | Investigators will make a call to follow up the day when the participants return to work and normal activities | 10 days post-op | 
| Participants' satisfaction post-procedure | To rate satisfaction with overall teatment regime with a numerical scale of 0 (least satisfied) to 10 (most satisfied) through an app named Recovery+ | 3 days post-op | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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microwave ablation, varicose veins, traditional treatment