Endovascular Management of Varicose Veins: A Review of Literature

Abstract

Venous insufficiency of the lower limb is a common condition characterized by a spectrum of symptoms, including bulging leg veins, pain, swelling, and ulceration. Various treatment options are available; however, the newer endovascular options are easy, highly effective, safe, and quick in relieving symptoms. Endovascular treatment options include thermal ablation, mechanicochemical ablation, and foam sclerotherapy. This review article briefly describes various scoring systems used in varicose veins, the role of imaging, different management techniques, and guidelines proposed in the management of this condition.

 

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Keywords

varicose vein - intervention - radiology

Introduction

A chronic venous disorder is a clinical condition characterized primarily by weakness within the vein wall and associated with valvular dysfunction and venous reflux.[1] Chronic venous insufficiency (CVI) of the lower limb is a syndrome that includes all the signs and symptoms occurring due to persistent venous hypertension. Patients present with a spectrum of symptoms, including prominent leg veins (telangiectasias, varicosities), heaviness, pain, itching, swelling, muscle cramps, discoloration, and ulceration.[2]

The estimated prevalence of CVI is up to 73% in female population and up to 56% in the male population.[3] The Framingham study showed that 77% of women older than 70 years and 10% of women younger than 30 years had varicose veins.[4] Various risk factors associated with the condition include female sex, prolonged standing/sitting, pregnancy, occupation (e.g., policemen, farmers, teachers), hormonal influence, obesity, family history, and advanced age.[5] An excellent and thorough understanding of the lower limb venous anatomy and physiology is warranted for an effective treatment. Different treatment options include traditional surgical management and newer endovascular treatments. Endovascular options include thermal ablation, mechanicochemical ablation (MOCA), and foam sclerotherapy.

 

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Pathophysiology

Venous pressure in the lower limbs is dependent on the proper functioning of the normal ability of the venous system and calf muscles to return blood, the absence of an upstream venous obstruction, and inflow via the arterial system. Failure of these mechanisms can lead to venous hypertension. CVI of the lower limb develops due to several reasons, including valvular dysfunction, venous wall dysfunction, or deep venous hypertension secondary to proximal venous obstruction. Primary valvular insufficiency develops due to structural and intrinsic biochemical changes[2] in the vein wall, and secondary venous insufficiency develops due to venous thrombosis.

 

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History and Clinical Examination

A detailed clinical history and physical examination are required for a patient presenting with symptoms of varicose veins.[1] [6] [7] Posttreatment follow-up assessing the same clinical parameters helps in evaluating the effectiveness of the procedure, the level of patient satisfaction, and complications associated with the procedure. A clinical questionnaire with essential questions related to how the symptoms of CVI affect the patient’s quality of life (QoL) is crucial and is recommended. Such a questionnaire can be administered just before the consultation. Availability of a questionnaire in languages other than English is highly recommended to increase the yield and effectiveness of the questionnaire. We propose a simplified questionnaire that addresses all the important questions ([Fig. 1]).

Fig. 1 A simplified proposed pre-consultation questionnaire to assess the patient’s condition.

Physical examination involves inspection and palpation of the extremity to look for signs of edema, asymmetry, ulceration, and skin manifestations (rashes, hyperpigmentation). Pelvis should be assessed to rule out any underlying pelvic vein insufficiency or iliac vein obstruction. Arterial insufficiency should also be evaluated before deciding any treatment. The findings collected from the patient’s history and physical examination should be organized in various standardized disease severity classifications such as the CEAP (clinical, etiologic, anatomical, pathophysiologic) and VCSS (venous clinical severity score) to standardize the clinical findings and treatment outcomes.

Clinical Etiologic Anatomical Pathophysiologic Classification

The CEAP classification was proposed by the American Venous Forum and endorsed by the Society for Vascular Surgery, which was published first in 1994 and later revised in 2004.[8] The CEAP classification is a comprehensive assessment system that takes into account the features such as clinical (C) aspects of venous disease, etiology (E) of the venous disease, anatomical (A) location of the disease, and pathophysiologic (P) components of the disease. The condition is clinically (C) classified as (a) C0: no visible or palpable signs of venous disease, (b) C1: telangiectasia or reticular veins, (c) C2: varicose veins, (d) C3: edema, (e) C4a: hyperpigmentation or eczema, (f) C4b: lipodermatosclerosis, (g) C5: healed venous ulcer, (h) C6: active venous ulcer, (i) s: symptomatic, (ache, pain, tightness, skin irritation, heaviness, muscle cramps), and (j) a: asymptomatic. Etiologic (E) classification of the disease includes Ec (congenital), Ep (primary), Es (secondary), and En (no cause identified). Anatomical (A) classification of the venous disease includes As (superficial veins), Ap (perforator vein), Ad (deep veins), and An (no cause identified), and pathophysiologically as Pr (reflux), Po (obstruction), Pr,o (reflux and obstruction), and Pn (no cause identified).[8] CEAP classification is the most widely used and accepted system to report chronic venous disease.[9]

 

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Venous Clinical Severity Score

The VCSS is a QoL score used to supplement the CEAP classification. The score allows quantification of disease severity and how it affects the patient’s QoL. Ten clinical characteristics are evaluated and graded between scores 0 and 3 to a total score of 30. The 10 clinical characteristics include (a) pain or discomfort, (b) varicose veins, (c) edema, (d) pigmentation, (e) inflammation, (f) induration, (g) number of active ulcers, (h) active ulcer size, (i) active ulcer duration, and (j) use of compression therapy. It is useful in grading severity of a patient with a CEAP score of C2 and higher, and more so in patients with CEAP class of C4 to C6. The VCSS score reduces both intra- and interobserver variability and allows better assessment and comparison of signs, symptoms before and after the procedure.[10] [11] VCSS minus stocking (VCSS-S) score can be used to assess the effect of mechanical compression on the angiogenesis post varicose treatment.[12]

 

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Quality-of-Life Measure

Chronic venous disease is associated with depression in up to 30% of patients.[13] Assessment of the QoL is essential and integral allowing a thorough and a complete evaluation of the condition. Improvement or deterioration in the disease is associated with a change in the patient’s QoL score. Several tools are available to assess QoL; however, they lack sensitivity. The CIVIQ-20 is a 20-item QoL questionnaire that was created in 1996.[14] The questionnaire covers four aspects: physical, psychologic, social, and pain. This questionnaire can be accessed on www.civiq-20.com. This questionnaire is disease-specific with high sensitivity and reliability.[15]

 

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Duplex Ultrasound Study

Duplex scan is the most widely accepted and useful initial imaging tool in the diagnosis of venous insufficiency, its extent, and the treatment planning. The use of both grayscale imaging and pulsed wave Doppler together allows the assessment of both the anatomy and the physiology (concerning the hemodynamics, valvular competency, and venous obstruction) of the lower limb venous system. The addition of color Doppler improves and quickens the ultrasound study. Duplex scan is considered a gold standard for chronic venous disease. The noninvasive nature and the quick reproducibility have allowed the Duplex scan to replace the more invasive procedures such as phlebography that is mainly reserved for exceptional indications. Duplex scan is also a highly useful follow-up tool and helps predict recurrence at saphenofemoral junction (SFJ) at 5 years.[16]

A complete duplex scan incorporates the following features: (a) anatomical information, (b) assessment of flow dynamics, (c) morphology of the valves, and (d) assessment of flow augmentation and venous compressibility ([Fig. 2]).

Fig. 2 Points to report for a complete and comprehensive duplex scan.

Scan Protocol

A standardized duplex evaluation should be performed in a relaxed standing position with the examined leg externally rotated and the weight transferred onto the contralateral limb. Patency of the iliac vein and common femoral veins should be checked in a supine position, whereas femoral and popliteal vein should be investigated in standing position. Deep veins should be examined with relaxed calf muscles. A high-frequency (7.5–10 MHz) linear array probe with pulse repetition frequency is set to detect low-velocity flow and reflux. The cutoff values to define as reflux in various segments of the venous system include more than 1 seconds in the popliteal vein and femoral vein, more than 0.5 second in the deep femoral vein, superficial venous system, and calf veins, and more than 0.35 second in perforating veins (all of which are in standing position).[17] The superficial venous system includes the great saphenous vein (GSV), short saphenous vein (SSV), anterior accessory saphenous vein (AASV), and posterior accessory saphenous vein (PASV). Perforator diameter should be measured at the fascial level. The GSV diameter should be taken in three locations: 3 cm below SFJ, at mid-thigh, and knee. The SSV diameter should be taken 3 cm below saphenopopliteal junction (SPJ)[18] ([Fig. 3]).

Fig. 3 Venous screening worksheet.

 

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Management

Conventional Surgery

Surgical intervention has historically been the treatment of choice for venous insufficiency for more than half a century. Ligation, stripping, and avulsion have been some of the older techniques used. The requirement of hospitalization, general anesthesia, and associated postsurgical complication makes it less attractive for the patient. About 25 to 50% of patients present with recurrence within 5 years[19] [20] [21] of surgery because of neovascularization, reendothelialization, or incomplete/inadequate/inappropriate treatment.

Newer surgical methods include Cure conservatrice et Hémodynamique de l’Insuffisance Veineuse en Ambulatoire (CHIVA) and ambulatory phlebectomy. Ambulatory phlebectomy is a newer refined surgical technique used by avulsing tributaries under local anesthesia using small stab-like incisions. CHIVA is a shunt ligation technique.

 

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Compression Therapy

Compression therapy has been used in the management of ulcers and wounds for several centuries and has undergone the process of evolution from the early days of an inelastic bandage to elastic bandages. Compression therapy remains a crucial component in CVI management because of its noninvasive nature and the ease of its use. Compression therapy counteracts the effect of gravity by decreasing both venous hypertension and interstitial pressure preventing venolymphatic disorder.[22] It is the Laplace’s law that dictates in compressive therapy were external pressure (P) is inversely proportional to the radius of curvature (R) and directly to the tension of the material (T). Various compression devices include graduated compression stockings, bandages, pneumatic compression devices, etc. Graduated compression stockings are the first line of management in venous insufficiency, in patients who cannot undergo an ablative/surgical treatment, or in a postprocedure setup.[23] [24] Some studies suggest that stockings do not provide added benefit over 1 week.[25] Progressively graduated compression stockings (higher pressure at calf than ankle) are better than degressive graduated compression stockings (higher pressure at the ankle) in terms of improvement in patient symptoms and ease of wearing.[26] In general, compression stockings are associated with poor patient compliance and skin damage. For an effective treatment, the elastic compression stockings should fit properly and be changed every 2 to 4 months as per the manufacturer’s advice.

 

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Sclerotherapy

Sclerotherapy is a chemical ablation technique performed by injecting chemical irritants into the venous lumen under ultrasound guidance leading to inflammation, thrombosis, occlusion and eventually fibrosis. The chemical irritants, known as sclerosants, can be injected as either liquid or foam. These include sodium tetradecyl sulfate (STS), polidocanol, sodium morrhuate, glycerin, and hypertonic saline. Sclerosant causes irreversible damage by attacking the lipid and cell wall within the endothelium. Sclerosants are commonly used as foam is created by the Tessari technique. Tessari method uses mixing of air and sclerosant using a three-way stopcock. Most commonly used mix is a 4:1 combination of air:sclerosant.[27] [28] Sclerotherapy is indicated in the treatment of truncal incompetence, large varicose veins, reticular vein, telangiectatic veins, and incompetent perforators. Absolute contraindications include allergy to sclerosant, acute deep venous thrombosis, active infection at the site of treatment, or prolonged immobility. Post-sclerotherapy compression stockings are necessary to prevent thrombophlebitis. Sclerotherapy is less time consuming, easily repeatable, relatively painless, and inexpensive with a faster recovery. Studies have reported up to 82% cosmetic improvement, 90% symptomatic improvement, and 85% closure rates.[29] Complications are seen in up to 1.2% cases and include drug reactions, pain, venous thrombosis, necrosis, hyperpigmentation, migraine-like headache, transient ischemic attack, visual disturbance, and pulmonary embolism.[29] Foam sclerotherapy is associated with a 90% recurrence rate after 6 years, which is a significant problem[30] requiring repeated sittings. Catheter foam sclerotherapy is a recently introduced technique that is as effective as an ultrasound-guided procedure.

 

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Endovenous Thermal Ablation

Percutaneous endovenous thermal ablation has emerged as a proven, safe, and effective alternative procedure to conventional surgical stripping. The procedure is associated with several advantages, including minimally invasive nature, outpatient procedure, requirement of only local anesthesia, immediate discharge and ambulation, faster recovery, and less periprocedural morbidity. Two forms of endovenous thermal ablation are commonly used: endovascular laser ablation (EVLA) or radiofrequency ablation (RFA). These techniques mainly require an injection of tumescent liquid around the target vein as a protective cushion for the perivenous tissue by the heat sink effect. The principle of RFA is based on heat that is generated by high-frequency alternating current whereas laser ablation is based on the principle of emission of a monochromatic single wavelength wave (ranging from < 420 to 10,600 nm). The technique for both procedures is same; the procedure is performed percutaneously under ultrasound guidance. The probe is placed 1 to 2 cm distal to the saphenous junctions, followed by which tumescent fluid made of saline, local anesthesia, sodium bicarbonate, and epinephrine is injected along the full course of the vein. The fiber is withdrawn as the energy is emitted that causes an irreversible intraluminal endothelial damage. Post-procedure compression is recommended.[6] Laser ablation is associated with an occlusion rate ranging from 77 to 100%.[31] [32] [33] Laser ablation and RFA have almost the same occlusion rates, except the fact that patients treated with RFA have less postoperative bruising and pain.[34] Postprocedure complications include pain, thrombophlebitis, thromboembolism, skin burns, bruising, hyperpigmentation, paresthesia, and pulmonary embolism.[35] [36] [37]

 

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Newer Techniques

Nonthermal Ablative Techniques

The success of thermal ablative techniques and medical advances led to the development of various nonthermal ablative techniques that completely obviate the need of tumescent anesthesia, further reducing procedure time and post-procedure pain, bruising, and sensory nerve damage. It mainly includes three techniques: endovenous microfoam sclerotherapy, endovenous MOCA, and cyanoacrylate embolization.

 

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Endovenous Microfoam Sclerotherapy

Varithena is a preformed polidocanol foam canister that is of pharmaceutical grade and the Food and Drug Administration (FDA) approved for the treatment of incompetent GSV. It is a low-density injectable that contains polidocanol, ultra-low amount of nitrogen, oxygen, and carbon dioxide producing a 1% microfoam solution.[38]

 

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Mechanochemical Endovenous Ablation

Mechanochemical endovenous ablation (MOCA) is a hybrid endovascular procedure that, as the name suggests, has two components: (1) mechanical abrasion via a special catheter and (2) chemical ablation by injecting foam sclerosant. Sodium tetradecyl sulfate or polidocanol can be used as the sclerosant agent of choice ([Fig. 4]). The mechanical damage of the endothelium is caused by the catheters rotating element/sharp tines and the chemical damage by the sclerosants. The mechanically damaged endothelium activates coagulation and causes vasospasm with the sclerosant damaging the lipid cell wall. These together lead to occlusion of the vein.[39] The procedure is associated with faster recovery and less post-procedure pain and discomfort.[40] The procedure has several advantages over other ablative techniques, including (a) reduced pain, bruising and discomfort, (b) no tumescent anesthesia, (c) no risk of nerve and skin damage, and (d) rapid return to regular activity. No major complication is associated with this technique. Minor complications such as local site hematoma, thrombophlebitis, and ecchymosis can occur.[41] Tang et al noted no major complications within their study. Approximately 4% of the patients presented with thrombophlebitis.[42] MOCA has shown a closure rate of 87 to 96%.[39] [43] A randomized controlled trial comparing MOCA and RFA showed a closure rate of 92% at 4 weeks.[44] Tang et al reported no difference in occlusion while treating GSV and SSV.[42]

Fig. 4 A 63-year-old male patient first presented with complaints of itching and dull aching pain in the right leg. On screening venous Doppler, there was reflux across the saphenopopliteal junction (SPJ) with a dilated short saphenous vein. Patients CEAP score was C4a and VCSS score was 7. (A–H) Sequential procedure images. (A) Punctured SSV with a 6F sheath within the SSV. (B, C) Flebogrif catheter with opened tines. (D) Foam sclerosant syringe connected to the Flebogrif catheter hub. (E, F) Catheter tip seen in axial section in the SSV (black arrow in E) and in sagittal section (yellow arrow in F). (G, H) Catheter tines are opened (black arrows in G) with occlusion postmechanical ablation.

 

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Cyanoacrylate Embolization

The VenaSeal Sapheon Closure System is a proprietary n-butyl-2-cyanoacrylate–based formulation. This is injected into the lumen to treat varicose veins. It polymerizes when it comes in contact with blood leading to occlusion of the vessel.[45]

 

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Laser-Assisted Foam Sclerotherapy

Laser-assisted foam sclerotherapy (LAFOS) is characterized by foam injection that precedes a low-energy laser ablation. No tumescent anesthesia is necessary for this technique. A study showed a 100% occlusion rate.[46]

 

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Guidelines

The NICE (National Institute for Health and Care Excellence) guidelines for varicose veins, first issued in 2013, make several recommendations (all recommendations are for patients aged > 18 years).[47] Guidelines have also been proposed by a few other vascular societies such as the American Venous Forum, the Society for Vascular Surgery, and the European Society for Vascular Surgery. Most of the available guidelines are in agreement with the guidelines proposed by NICE.

 

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Treatment Comparison

With the availability of several treatment options choosing the right treatment for the right patient is a crucial decision that needs to be taken. Kheirelseid et al in their meta-analysis noted that 36.6% patients who underwent EVLA presented with recurrence in comparison with 33.3% patients who underwent conventional surgery at the end of 5 years.[48] Xiao et al found no difference in the results of EVLT versus surgery.[49] One study showed that 50% of recurrences occurred after 2 years of surgery whereas recurrence was seen in 12% of patient within 6 months of laser ablation.[50] Kheirelseid et al found no significant difference in recurrence rate when comparing surgery over RFA.[48] Luebke et al found that on comparing RFA over surgery, radiofrequency has several short-term benefits; however, there was an increasing rate of recanalization at 1 year.[51] Studies comparing surgery and endothermal procedure found both to have the same results over the long term; however, the endothermal procedure had several advantages, including it being a safe and effective procedure with faster recovery.[52] RFA and laser ablation had similar outcomes on both short- and long-term follow-up.[53] Several studies have found minimally invasive procedures as effective and safe,[54] [55] with one study reporting endothermal ablation being superior to surgery.[56] As suggested by the NICE guidelines,[47] endothermal treatment is the first line of treatment. In patients not suitable for endothermal ablation, ultrasound-guided foam sclerotherapy must be offered as the next treatment option. Only patients in whom both endothermal treatment and foam sclerotherapy are not a suitable treatment option should surgery be offered.

 

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Conclusion

Venous insufficiency of the lower limb is a widespread condition that, when diagnosed and treated early, can prevent disease progression and complications associated with the procedure. Principles of ultrasound and intervention are well understood by the interventional radiologist giving them the skills to treat the condition with utmost accuracy ideally. Studies have shown that endovascular treatment offers equal long-term efficacy similar to surgery. Nonthermal endovenous ablations are newer techniques but are in need of long-term outcome data.

 

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Conflict of Interest

None.

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