Venous Ulcers October 1, 2020
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Leading the way. The Guide Wire NEWSLETTER • JULY 2020 VENOUS ULCERS weight of the blood presses distally, interstitial tissue spaces produces What is a venous ulcer? and the highest pressures generated a brawny, brownish pigmentation Venous ulcers are a consequence by this mechanism are expressed at often associated with venous of venous hypertension, usually the level of the ankle and foot. ulcers. This is due to haemosiderin caused by chronic deep or deposition caused by the breakdown “The second mechanism of venous 1 superficial venous insufficiency1. of the red blood cells , and is hypertension is dynamic. The predominantly seen in the medial Until recently, it was believed that anatomic angulation of superficial lower third of the calf. Pigmentation venous ulceration was primarily to deep perforating veins and their may be followed by an itching, due to deep venous insufficiency contained valves normally prevent weeping dermatitis, in turn, possibly following valve failure, (either compartmental pressure from being progressing to ulceration2. Ulceration primary valvular failure, or as a transmitted to subcutaneous tissue may be either spontaneous, or as a consequence of deep venous and skin. Failure of this mechanism result of minor trauma. Although the thrombosis causing damage to the allows intra-compartmental pathophysiology of the ulceration venous valve), or as a result of failure forces to be transmitted directly to is not clear, it appears to be related unsupported subcutaneous veins of the calf muscle pump. However, to an inflammatory reaction in the and dermal capillaries. There, the recent studies have suggested that tissue, fibrin cuffing and eventual effective vessels elongate, dilate 3 up to 57% of venous ulcers are due lipodermatosclerosis . and lose their valve competence. to superficial venous reflux alone, Thus, venous hypertension is both Risk Factors with the deep veins demonstrating hydrostatic and hydrodynamic2.” normal venous competence 1. • Previous deep venous Subcutaneous tissue and skin are the thrombosis and subsequent That said, it is important to note ultimate targets for chronic venous post thrombotic syndrome that some ulcers which may appear insufficiency2. The underlying cause • Superficial venous venous in origin can possibly be of ulceration is still unclear, but it incompetence (either caused by other conditions such is thought to involve changes in primary, or secondary as a as rheumatoid arthritis or skin the microcirculation of the skin consequence of the above). disorders1. and subcutaneous tissues. Venous • Obesity Pathophysiology hypertension causes an increase in • Immobility venular and capillary pressure, in • Arthritic conditions (result Lower limb venous hypertension is turn, leading to local oedema and in reduced movement of a result of one of two sources. The reduced reabsorption of proteins the ankle joint, which may first is reflux of gravitational origin, and fluid from the interstitial tissue lead to failure of the calf also known as hydrostatic pressure. spaces. Leakage of red blood cells muscle pump)1. When venous valves fail to coapt, the across the capillary wall and into the 2424 VHC Newsletter Jun2020.indd 1 8/7/20 1:42 pm Role of Ultrasound Ultrasound is a useful tool to rule out deep venous pathology which may affect the successfulness of varicose vein treatment3, and can be used for the assessment of patients with primary or secondary varicose veins, or the investigation of patients with skin changes and extensive venous ulceration1. Early detection and recognition of the pre-ulcerative leg are important factors which influence the effectiveness of treatment and the duration an ulcer may be active for. Clinical Appearance Venous ulceration presents on the ulcers are usually painless. the aforementioned haemosiderin CEAP classification table as - deposition) and is frequently Ulcers may be large and shallow, • C5 - skin changes with healed ulcer associated with local skin irritation with a red base sometimes covered • C6 - skin changes with active ulcer4 or iotching1. Ultimately, ankle by yellowing tissue (See Figure Two). ulceration in the gaiter zone (located Exudate fluid can vary in its degree6. Venous ulcers usually vary in size in the lower calf and ankle)3 occurs. and can be reasonably shallow. Venous ulcers usually demonstrate In this region, the ambulatory In some cases ulcers may be uneven borders, and the surrounding superficial venous pressures are circumferential, involving a large skin may be tight, shiny, warm and the highest, leading to oedema, area of the lower calf. discoloured5 (See Image One). pigmentation, and ulceration. Often, they become infected with Before ulceration occurs, venous The skin, after years of oedema, different types of bacteria and in hypertension typically presents is difficult to examine for venous these instances can be extremely clinically as chronic leg swelling incompetence (both clinically and painful1 and produce an odour5. and ankle pigmentation (in the form with ultrasonography) because of In the absence of infection, venous of reddish brown pigmentation- extensive fibrosis3. Clinical* Clinical Classifications with examples C0 - No clinical sign C1 - Small varicose veins C2 - Large varicose veins C3 - Edema C4 - Skin changes without ulceration C5 - Skin changes with healed ulceration C6 - Skin changes with active ulceration Etiology* EC - Congenital C - Telangiectasias or C - Varicose veins 1 reticular veins 2 EP - Primary ES - Secondary (usually due to prior DVT) Anatomy* AS - Superficial Image One - Venous Ulcer with obesity as co-factor. Image courtesy of Wound Source6. AD - Deep veins AP - Performing Pathophysiology* PR - Reflux C3 - Edema and corona C4 - Lipodermatosclerosis PO - Obstruction and eczema “Early application of compression should be performed to correct swelling and progressive scarring and to initiate the healing process by improving the venous microcirculation.” Kistner R. Specific Steps to Effective Management of Venous Ulceration, Supplement to Wounds June 2010. *Fronek HS, Bergan JJ, et al. The Fundamentals of C - Ulcer scar C - Active ulcer Phlebology: Venous Disease for Clinicians, 2004. pg 151. 5 6 Table One - CEAP Classification Table. Courtesy of CPD for General Practitioners (n.d)7. Image Two - Venous Ulcer. Image courtesy of Wound Source6. 2424 VHC Newsletter Jun2020.indd 2 8/7/20 1:42 pm Complications Take Home Message It is important to remember that Predisposing Factors some venous ulcers are associated • History of DVT with arterial disease and patients • Incompetent perforators with mixed venous and arterial ulceration can pose a challenging • Varicose Veins diagnostic problem for treating • Obesity physicians. Therefore routine Associated Changes to the Lower Limb measurement of the ABI in all • Firm “brawny” oedema patients with ulceration and risk factors for peripheral artery disease • Reddish brown discolouration may be recommended to exclude a • Evidence of healed ulcers significant arterial component1. • Dilated and tortuous varicose veins Treatment • Limb may be warm Ulcer Location Treatment of superficial venous incompetence, either through • Anterior to medial malleolus ablation (thermal or chemical) • Pretibial area or surgical options results in the • Generally lower 1/3 of leg majority of ulcers healing due to Ulcer Characteristics reduction of venous hypertension. • Uneven edges Venous ulcers that are caused by • Ruddy granulation tissue significant deep venous insufficiency • No necrotic tissue are not treated as above, as the underlying venous hypertension Pain will not be corrected. Instead, • Moderate to no pain compression bandaging which • Discomfort relieved by leg elevation reduces oedema and venous hypertension has proved to be an Surrounding Area effective method of healing ulcers. • Leaking oedema may result in maceration, pruritus and scale Different compression grades can Pulses used dependant on the clinical • Normal leg and foot pulses situation. An ABI of >0.9 is required for the application of four layer Compression Bandaging Guidelines compression dressings in order • Compression bandages over padding with/without tubular to prevent arterial compromise of stretch bandage over compression bandages 1 tissues under the bandaging . Table One- Indicators for the Assessment of Venous Leg Ulcers – Curtesy of Carville 20058. Reference List 1. Thrush A & Hartshorne T. Peripheral Vascular Ultrasound: How, why and when. 2nd Ed. Elsevier Churchill Livingstone. Philadelphia, Pennsylvania. 2005. pp170-2 2. Dean 3. Zwiebal WJ & Pellerito JS. Introduction to Vascular Ultrasonography. 5th Ed. Elsevier Saudners. Philadelphia, Pennsylvania. pp479-80 4. Myers K & Clough A. Making Sense of Vascular Ultrasound. Oxford University Press. New York City. New York. 2005. pp211 5. Sobel, M. Venous Ulcers- Self Care. Medline Plus. U.S National Library of Medicine. [Internet] 2018. [Cited 23rd April 2020]. Available: https://medlineplus.gov/ency/patientinstructions/000744.htm 6. Wound Source. Venous Insufficiency Ulcers. Kestral Health Information. [Internet] n.d. [Cited 23rd April 2020]. Available: https://www.woundsource.com/patientcondition/venous-insufficiency-ulcers 7. CPD for General Practitioners. Ulcer Assessment. Revalidation Support Unit (RSU). [Internet] n.d. [Cited 24th April 2020]. Available: https://gpcpd.heiw.wales/clinical/venous-leg-ulceration/ulcer-assessment/ 8. Coville K. Wound Care Manual. 5th Ed. Silver Chain Foundation. Osborne Park, Australia.