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Etiology and management of leg ulcers - an enigma.

Byline: Neerja Puri and Ashutosh Talwar

Abstract

Chronic leg ulcer is defined as a defect in the skin below the level of knee persisting for more than six weeks and shows no tendency to heal after three or more months. Leg ulcers are debilitating and greatly reduce patients' quality of life. The common causes are venous disease, arterial disease and neuropathy. Management of patients with chronic ulcers has to be multidisciplinary and should include detailed history, physical examination, investigations, basic and newer treatment modalities, and educating patients on issues of correct foot care and the importance of seeking early medical advice.

Keywords

Leg ulcer, management, venous ulcer, arterial ulcer, diabetes, insufficiency, neuropathic.

Introduction

Chronic ulceration of the lower legs is a relatively common condition amongst adults, one that causes pain and social distress.1 The condition affects 1% of the adult population and 3.6% of people older than 65 years.2 Chronic ulceration of the lower legs is a relatively common condition amongst adults, and ulcer symptoms usually include increasing pain, friable granulation tissue, foul odor, and wound breakdown instead of healing.

It has been reported that leg ulcers related to venous insufficiency constitute 70%, arterial disease 10%, and those of mixed etiology 15% of presentations.3 The remaining 5% of leg ulcers result from less common pathophysiological causes, and this latter group comprises considerable challenges in diagnosis, assessment, and management. Leg ulcers are mainly caused by venous insufficiency, arterial insufficiency, neuropathy, diabetes (Figure 1), or a combination of these factors.4 Venous ulcers are the most common type of leg ulcers, accounting for approximately 70% of cases.5,6,7

Arterial disease accounts for another 5% to 10% of leg ulcers; most of the others are due to either neuropathy (usually diabetic) or a combination of those diseases. A study from India shows that etiology of chronic wounds included systemic conditions such as diabetes, atherosclerosis, tuberculosis, and leprosy.8 Other major causes included venous ulcers, pressure ulcers (Figure 2), vasculitis, and trauma. Venous ulcers most commonly occur above the medial or lateral malleoli.9,10 Arterial ulcers often affect the toes or shin or occur over pressure points. Neuropathic ulcers tend to occur on the sole of the foot or over pressure points.

Discussion

Venous ulceration is the most common type of leg ulceration. Sixty to 80% of leg ulcers have a venous etiology. Venous ulcers arise from venous valve incompetence and calf muscle pump insufficiency which leads to stasis and venous hypertension.11 This results in microcirculatory changes and localized tissue ischemia. The natural history of the disease is of a continuous cycle of healing and breakdown over decades and chronic venous leg ulcers are associated with considerable morbidity and impaired quality of life. Venous circulation of the lower extremities progresses from the superficial to perforating to deep veins, with valves in each system to ensure unidirectional blood flow.12 As the calf muscles contract, the pumping action causes the blood to flow from the deep veins into the inferior vena cava. Disease of these pathways results in venous insufficiency. Venous ulcers (Figure 3) are more common in women and older persons.

The primary risk factors are older age, obesity, previous leg injuries, deep venous thrombosis, and phlebitis. Venous ulcers are often recurrent, and open ulcers can persist from weeks to many years. Severe complications include cellulitis, osteomyelitis, and malignant change.13

In venous disease, ulcers are usually located in the gaiter area between the ankle and the calf, often on the medial aspect of the leg. Venous ulcers arise from venous valve incompetence.

Valvular incompetence in the deep veins causes the vessels to become distended and stretched to accommodate the additional blood flow. The valves are not able to close effectively, which results in retrograde blood flow and venous hypertension.15 The venous hypertension, leads to leakage of fluid out of the stretched veins into the tissues, causing deposition of a brownish/red pigment in the gaiter area of the leg. Venous ulceration occurs in the gaiter area in 95% of cases especially around the malleolar region. Veins can be damaged by surgery, trauma, or deep venous thrombosis, which causes a backflow of blood in the venous system at the point of damage. Other causative factors include multiple pregnancies, obesity, congenital vein abnormalities, and varicose veins. Venous ulcers are commonly associated with varicose eczema which is characterized by erythema, weeping, scaling and pigmentation, and may be misdiagnosed as infection.

Venous ulcers are also prone to being complicated by allergic contact dermatitis. The clinical appearance of varicose eczema and allergic contact dermatitis is similar, but the distribution and response to treatment provide useful diagnostic information.16

The management of leg ulcers should include a detailed history of the onset of the problem, examination of the legs and skin, investigations, and modalities of treatments. The first step toward diagnosis of any leg ulcer is to compile a comprehensive history and assessment of the patient. This should include general health status, social and occupational situation, past and current medical history of relevant diseases (such as deep vein thrombosis, diabetes, autoimmune disorders, inflammatory bowel disease, and connective tissue disease), condition of the skin, current vascular status, limb size and shape, and history and status of the ulcer.17,18 The patient should be asked about lower extremity pain, paresthesia, anesthesia, and claudication. It is important to determine the duration of ulceration and whether it is a first episode or recurrent. Pain is a major problem for patients with leg ulcers unless there is a neuropathic component.

Lack of pain, therefore, suggests a neuropathic etiology. Patients should also be asked about their mobility. The examination of the leg should include palpation of pulses and a search for the signs of venous hypertension, including varicose veins, hemosiderin pigmentation, varicose eczema, atrophie blanche, and lipodermatosclerosis. The ulcer examination should include site, size, appearance, wound base, exudates level, and surrounding skin. The surrounding region should be examined for pain, edema, erythema, warmth, induration, discoloration, maceration, dryness, scarring from previous wounds, hair pattern, gangrenous digits, clubbing, cyanosis, capillary refill, and varicose veins. It is important to bear in mind that venous and arterial disease may coexist in the same patient. Venous ulcers differ considerably from arterial ulcers and other ulcers of lower extremity.

An irregular ulcer border, black necrosis, erythema, or bluish or purple discolorations of adjacent skin are suggestive for ulcer due to vasculitis. A painful leg ulcer with violaceous borders suggests pyoderma gangrenosum.

For management of leg ulcers, the leg should be assessed for signs of venous disease, in particular, varicose veins, venous dermatitis, hemosiderin deposition, lipodermatosclerosis and atrophie blanche.19,20 A venous duplex scan may aid assessment of the leg. Edema should be assessed and non-venous causes of unilateral and bilateral edema ruled out. Joint mobility, particularly that of the ankle, is an important component of calf muscle pump function and should be carefully recorded. It is important to assess arterial supply with respect to safety of compression therapy, which is the standard treatment for venous leg ulcers. Palpation of pulses alone is not adequate to rule out peripheral arterial disease. Measurement of the ankle brachial pressure index (ABPI) of both lower limbs by hand-held Doppler device is the most reliable way to detect arterial insufficiency.21 Ulcerated legs should be washed normally in tap water and carefully dried.

Necrotic material or slough within a wound margin acts as a medium for bacterial proliferation and therefore should be removed by debridement.22,23 General care of the skin surrounding an ulcer is essential to maintain skin integrity and minimize the risk of further ulceration. The peri-ulcer skin should be treated routinely with a bland emollient, and ulcer margins should be coated with a barrier preparation to prevent maceration of surrounding skin. Uncomplicated venous dermatitis usually responds to emollients, but often topical corticosteroids may be required. Failure to respond to a moderately potent steroid is an indication for patch testing.

The effectiveness of graduated compression stockings in achieving and maintaining healing is dependent on the correctness of fit and the pressure generated beneath the stocking.24

Compression bandaging is the most effective treatment for venous leg ulcer. The bandages work by helping push the blood in your leg veins back up to your heart. Different strengths are available and the aim is to find the strongest that patient can wear. A dressing is worn under the bandage. This will be changed when required, usually once a week. When the dressing is changed, leg is washed with warm tap water. Waterproof protectors are available for bathing/showering at home between dressing changes. In clinical and laboratory testing, not all stockings produce an adequate pressure or pressure gradient although they may be described as of a similar class. Patients should be offered the strongest compression which they can tolerate to prevent ulcer recurrence. Patients should be informed that it is likely that compression will be required indefinitely. If a patient finds a stocking uncomfortable, changing the brand of stocking within the same class may improve compliance.

Advise patients who experience pain in their calf when walking that this may be an indication of arterial disease and may affect their treatment options. The compression treatment with bandages or with a stocking is the single most important treatment for a leg ulcer, and is far more important than the ulcer dressing.25,26,27 Ensure that patients are aware of the need for a weekly change of bandage and that more frequent changes may be required in certain circumstances. Encourage patients to wash their leg gently in warm tap water when bandages are being changed. Advise patients that antibiotics are only needed very occasionally. Pentoxifylline may be used to help improve blood flow which may help leg ulcer to heal. The following advice should be offered to patients and carers during treatment of leg ulcers: when resting, you should try to keep your ankles up higher than your heart. This allows the fluid to drain from your legs.

At night time it is important that you keep to ones normal sleeping habits and trying to sleep in your bed rather than in a chair. Raising the foot end of the bed at night if tolerable will help to assist venous return. Dry scaly skin needs to be treated with a non-perfumed moisturizer/emollient to keep the skin moist.

Conclusion

An ulcer which is present for more than three months is considered as chronic ulcer. The majority of chronic leg ulcers are caused by venous insufficiency followed by arterial ulcers. A comprehensive assessment of the patient, limb, and ulcer is required to determine etiology and to formulate an appropriate management plan. The patients should be explained about the benefits of exercise and the need to wear compression hosiery from the time one gets up in the morning until going to bed at night, renewing hosiery every 3-6 months, keeping mobile and elevating their legs when resting.

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Publication:Journal of Pakistan Association of Dermatologists
Article Type:Report
Date:Sep 30, 2015
Words:2393
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