State of art in lymphedema management: part 1
Lymphedema and Vascular Malformation,
George Washington University School of
Chronic lymphedema can be managed effectively using a sequenced and targeted treatment program based on decongestive lymphatic therapy (DLT) with compression therapy and surgery (mostly as an adjunct to DLT). In the maintenance phase, DLT is carried out using the proper combination of compression garments, meticulous personal hygiene and skin care, self-massage based on the principle of manual lymphatic drainage (if applicable), and exercises and activities to promote lymph transport. Pneumatic compression devices/therapy can be applied at home, if desired. When conservative treatment based on DLT fails or delivers suboptimal outcomes, the patient may need additional surgical interventions, either reconstructive or ablative, where applicable. These two surgical therapies are more effective in terms of outcomes when combined postoperatively with manual lymphatic drainage–based DLT. A long-term commitment to postoperative DLT, especially compression therapy, is a critical factor in determining the success of either reconstructive or palliative surgery. Recently, several causal genetic mutations have been identified among primary lymphedema syndromes, which provide possible opportunities for future molecular interventions. This new prospect of gene-oriented management is more promising as a molecular therapy for both primary and acquired lymphedema.
Over the last 20 years, the understanding of lymphatic disorders has substantially improved, providing new insights into the lymphatic system’s structure and function for both primary and acquired forms of lymphedema.1-4 This evolution in the evaluation and management of lymphatic disorders was achieved due to advanced diagnostic imaging technology and the subsequent implication of newly developed approaches regarding physical modalities, surgical interventions, and pharmacology.5-8
We can now more clearly understand the differences in etiopathogenesis between primary lymphedema (mostly congenital lymphatic malformations) and secondary lymphedema (acquired conditions).9,10 This paper will present the best and most commonly used therapies available that have been thoroughly evaluated.1,2 These therapies can ultimately be recommended as the most updated guidelines for clinicians who are treating patients with this unique condition worldwide. This paper discusses the contemporary concepts regarding the management of chronic lymphedema, which encompass a broad range of currently available treatment options both old and new. However, the majority of the data available for review are classified as grade 2B or 2C when using the system by Guyatt et al and only a small amount of data are classified as grade 1C or 2A at best from observational studies (Table I).11-13 With consideration of this unique situation, we accept manual lymphatic drainage–based decongestive lymphatic therapy as the main treatment14-17 and surgical management as an additional option for the management of lymphedema.18-21
Chronic lymphedema starts as a simple condition of limb swelling following the mechanical failure of the lymphatic system’s mechanism for collecting and transporting lymph. However, such early-stage, but “reversible,” edema may become a chronic degenerative and inflammatory process. The impact of lymphatic fluid accumulation, which is initially limited to the lymphatic system and the lymph nodes, will spread to the entire surrounding soft tissue and skin, resulting in irreversible damage.8,22,23 Chronic lymphedema is a “steadily progressive condition that affects the entire surrounding soft tissue” that results in a disabling and distressing condition, where the major risks include bacterial and fungal infections and subsequent sepsis, chronic inflammation with dermatolipofibrosis, immunodeficiency and wasting phenomenon, and malignancies (eg, Kaposi sarcoma; lymphangiosarcoma) (Figure 1).2,7,24 Therefore, it is mandatory to treat lymphedema at the earliest detectable point in the evolution of the disease. A precise and timely diagnosis to verify its clinical stage is not only critical for proper treatment, but also for the prospective identification of early-stage disease in defined at-risk populations.25-27
Manual lymphatic drainage–based decongestive lymphatic therapy remains a main treatment for the contemporary management of lymphedema.28-31 Further improvements in function and quality of life can be achieved with lifestyle modifications, including specific exercise regimens.32 In addition, incorporating intermittent pneumatic compression may significantly reduce edema and symptoms (Figure 2).33,34 Currently, pharmacological interventions have little applicability in the management of lymphedema35-37; however, antibiotic therapy is necessary for the effective control of infections,38-40 and both growth factor–based and cellular therapies (ie, molecular modifications) continue to show great promise for the future.41-43 During the last 10 years, the use of surgery for lymphedema has increased, mostly by using newly developed/incorporated techniques for both reconstructive (Figure 3)44,45 and excisional (Figure 4)46,47 surgery.
The main treatment goals are to improve the physical condition of the affected limb or area and the patient’s quality of life,48,49 which, despite a psychologically unacceptable physical deformity, will ultimately improve the patient’s social life, functional and psychological state, and the ability to perform normal physical activities, so they can return to a normal or near-normal life.
Primary lymphedema occurs due to abnormal development of the lymphatic system, which frequently has a specific genetic origin that is inherited. Primary lymphedema is only a major clinical sign when patients have either Fms-like tyrosine kinase 4 (FLT4)–related lymphedema (ie, Nonne-Milroy-Meige syndrome [Milroy disease]) or forkhead box protein C2 (FOXC2)–related lymphedema (ie, lymphedema-distichiasis syndrome).51-54 In the majority of complex syndromes, lymphedema is a minor clinical manifestation, while other abnormalities dominate.55-57
Not all gene mutations will result in a phenotype that has a major impact on lymphatic function.58 Some individuals of the same family do not develop the disease due to incomplete penetrance, but they remain (healthy) carriers of the genetic mutation. When the mutation results in defective development (to varying degrees), the individual is no longer a healthy carrier, particularly from the management point of view, as (unknown) modifier genes that act according to a model of genetic susceptibility are closely associated with the activity.53 Indeed, healthy looking limbs, although infrequent, have various locoregional lymph transport abnormalities suggesting a defective development even in the absence of edema. Such a subclinical condition of lymphedema may lead to clinically significant lymphatic transport insufficiency later in life under certain conditions. Additionally, primary lymphedema contributes to many forms of secondary lymphedema due to underlying genetic susceptibility. This unique group of patients with subclinical presentation warrants special consideration in the scope of managing and preventing lymphedema.1,2,9,10
Lymphedema can be managed with physical therapy (ie, nonsurgical methods); it combines multiple elements of physical maneuvering known as decongestive physiotherapy.35 Physical therapy has three goals: (i) improve lymphatic function; (ii) soften fibrosclerotic tissues; and (iii) reduce microbial growth on the skin to prevent opportunistic infections. This approach can achieve effective limb volume reduction through a stepwise approach from the initial acute phase of intervention to the subsequent maintenance phase, preserving the integrity of the cutaneous and subcutaneous structures.59-61
A multilayer compression bandage can stimulate lymphatic contractility and subsequent lymph flow through physical activity.62 In addition, external tissue compression can increase interstitial hydrostatic pressure to subsequently reduce lymph formation. When the maximum reduction in edema volume is reached after performing multiple cycles of compression and manual lymphatic drainage, maintaining the therapeutic benefits depends on self-care strategies and the proper use of compression garments.60 The combination of regular exercise and external compression exerted by compression garments can improve lymphedema.63
Another technique that may augment lymph clearance is intermittent pneumatic compression, which provides a distal-to-proximal graduated and sequential compression that results in an adjunctive benefit to the decongestive physiotherapy.64,65 Low-level laser therapy has also been reported to produce both subjective and objective improvements in lymphedema66,67 with both anti-inflammatory and lymphangiogenic effects.68 Lastly, the application of vibration, heat, and external magnetic fields have also been reported to be beneficial, but few data support these reports.69
Decongestive lymphatic therapy is a nonsurgical treatment option to reduce swelling and maintain this reduction over the long term. This method uses compression, massage, and exercise to stimulate lymphatic drainage, which will reduce the swelling, soften the fibrotic tissues, and ultimately improve limb function and mobility. As skin is a barrier to infections, improving its function will reduce the rate and severity of cellulitis (Figure 2).70-73 Decongestive lymphatic therapy is a well-established treatment option for the management of lymphedema. It is an empirical strategy to control edema and it remains the treatment of choice regardless of the disease etiology (primary or secondary) or clinical stage and despite the fact that it is not a cure.
Compression therapy with bandages, garments, and intermittent pneumatic compression and manual lymphatic drainage are two major components of decongestive lymphatic therapy.71,72 Indeed, compression bandage– based therapy is the single most important component of decongestive lymphatic therapy with or without sequential intermittent pneumatic compression–based mechanical compression.74-77 However, basic hygienic care of the skin, movement exercises, and education for risk reduction, including the prevention of infections, are also essential components of the treatment regimen.
Decongestive lymphatic therapy has an initial phase of intensive decongestion therapy followed by a long-term maintenance phase. The primary goals of intensive treatment are to obtain a significant reduction in limb volume and changes in the tissue, and it includes a 2- to 4-week course of daily skin care, manual lymphatic drainage massage, multilayer compression bandaging, and exercise (Table II). Once intensive treatment is complete, maintenance treatment should be instituted immediately with proper fitting of compression hosiery, because, along with the intensive therapy, the maintenance phase is the cornerstone of contemporary lymphedema treatment.78,79
Decongestive lymphatic therapy can be a life-long therapy as the risk of complications and morbidity is minimal and, in the majority of patients, it helps maintain an improveddisease status. However, it is more effective when started in the earlier stages of lymphedema, because, in the later stages of lymphedema, the efficacy is limited and it often fails to prevent progression and complications. Successful decongestive lymphatic therapy requires good treatment compliance and that the patients be motivated to understand their condition, know the options available, and understand the absolute need for using compression daily to maintain the long-term benefits of treatment.80 Therefore, patient involvement in management is essential, especially for home maintenance therapy and should be guided properly for an active involvement in self-management. The long-term success depends on the comprehensive medical care of many accompanying conditions/diseases that can aggravate the lymphedema. Proper management of various comorbid conditions is essential because they can influence the therapeutic outcomes. The most common conditions include hypertension, coronary heart disease, congestive heart failure, obesity, diabetes mellitus, chronic venous insufficiency, malignancies, chronic arthritis, peripheral artery occlusive disease, and peripheral polyneuropathy. Calcium-channel blockers should be avoided since they impair lymphatic pumping.81
There are a few contraindications to each component of decongestive lymphatic therapy, including acute erysipelas, acute thrombophlebitis, phlebothrombosis, decompensated heart failure, and stage IV peripheral artery occlusive disease. High pressure bandaging is risky for any patient with advanced peripheral arterial disease of the limb or advanced cardiac failure.
Manual lymphatic drainage is a technique that physiologically stimulates poorly functioning, if not paralyzed, lymphatic vessels and pathways to facilitate the drainage of interstitial fluid into the initial lymphatic system to reduce lymphatic congestion effectively. In addition, this technique, by improving lymphodynamics during treatment, may reduce fibrosclerosis of the involved soft tissues.82,83
Manual lymphatic drainage uses a massage technique to reroute the accumulated lymph in the swollen region through collateral lymphatic pathways to an area where the lymph can drain normally. The initial step of the process is to decongest the central/proximal areas to make room before massaging the edematous regions. The manual lymphatic drainage massage is an important component of decongestive lymphatic therapy, especially for midline lymphedema treatment where there are few alternatives70; however, it should not be used alone as a sole independent regimen, but rather as one part of the decongestive lymphatic therapy. Indeed, manual lymphatic drainage has not yet been confirmed scientifically with objective data, although it has remained an indispensable component of decongestive lymphatic therapy for decades.84,85 Therefore, depending on local resources, manual lymphatic drainage may be included in the treatment plan despite the lack of evidence for long-term benefits.
The cornerstone of physical therapy for lymphedema regardless of its etiology is compression therapy, which increases tissue pressure and subsequently decreases the transmural pressure gradient to reduce the lymphatic load by reducing microcirculatory filtration.86 Compression therapy is generally initiated with a multicomponent bandage with high stiffness; short-stretch bandaging combined with exercises is ideal during the initial management phase and should be guided by specifically trained therapists. Following the initial decongestion phase, the maintenance phase must be well organized and use the best combination of compression garments, selfmanagement, skin care, and exercises because this phase requires a life-long commitment.87
The optimal degree and duration of compression remains debatable. Recent data support an optimal pressure range around 30 mm Hg for the upper extremities and 50 to 60 mm Hg for the lower extremities; however, higher pressures may be counterproductive.88 Lower compression pressure are more user friendly, which would improve compliance (Table III). Self-management must be adjusted with the proper combination of compression bandages or Velcro devices, movement exercises, and/or self-massage to fit with individual needs best. Less bulky bandages and Velcro devices seem to allow better movement and subsequently better outcomes than the widely used heavy set multilayer and multicomponent bandages.89,90 A recent study reported that self-adjustable Velcro devices might reduce edema more effectively than inelastic lymph bandages.90
Compression hosiery/stockings are made for the maintenance phase to maintain the effect achieved through the initial intensive treatment phase. Fitted garments with higher compression classes (30 to 40 mm Hg) are ideal, but they become a limiting factor, especially in patients with advanced age, obesity, and/or arthritis.
For many decades, pneumatic compression with multichamber devices has been effectively incorporated into multidisciplinary therapeutic programs as an adjunctive therapy to effectively remove excess fluid from the extremities.33,34,64 However, this device remains controversial due to concerns that the pressures generated by the device may damage the skin lymphatics, tempering earlier enthusiasm for the benefits of this technique.91,92 Recent studies have shown that intermittent pneumatic compression relieves symptoms, reduces episodes of cellulitis in patients with lower extremity lymphedema,93 and increases tissue elasticity.94
Sequential intermittent pneumatic compression can be recommended as an adjunct treatment,35 particularly for patients whose isotonic exercise capacity is highly compromised or absent, which means that the lymphedema can only be treated with passive physical therapy (eg, elderly, bedridden patients, patients with serious disabilities, etc).96,97 However, sequential intermittent pneumatic compression should be used as an adjunct treatment for mixed lymphovenous edema and it should not be used in preference to exercise and compression garments. Furthermore, clinical evidence shows that the formation of new tissue channels as functional pathways by intermittent pneumatic compression promotes the clearance of edema fluid in patients with lymphedema in the limbs.95
Medical and pharmacological management
a range of pharmacological treatments has been available for decades to try to improve lymphatic function, such as α-benzopyrones, which include coumarin derivatives, and γ-benzopyrones (ie, flavonoids), which includes flavones, flavonols (eg, diosmin), and flavanes (eg, hesperidin). The proposed mechanism of action is that benzopyrones reduce vascular permeability,98 which reduces the lymphatic load. Additionally, benzopyrones may increase tissue macrophage activity,99 thereby encouraging proteolysis with favorable effects on fluid clearance and tissue composition.100 Such drugs are all designed to help patients with lymphedema by reducing protein and extracellular fluid accumulation,101 stimulating lymph contractility and flow,102 and reducing protein concentration and fibrotic induration in tissues by stimulating tissue macrophage activity to increase proteolysis.99,100 However, there has been little, if any, data to support the use of these drugs, with the exception of the flavonoid/benzopyrone groups that have demonstrated significant and objective improvements.98,103,104
Recent data show that the hepatotoxic effects of coumarin (5, 6, benzo-α-pyrone), which prohibit its use for the treatment of lymphedema, are a consequence of a genetic and metabolic problem relating to the breakdown of coumarin.105 A new test that screens for genetic polymorphisms can identify people who have a functional, nonpolymorphic cytochrome P450 2A6 (CYP2A6) enzyme, a liver enzyme responsible for the metabolism of coumarin to noncytotoxic metabolites.106 A better understanding of genetics and genomics will help determine which patients will respond well and overcome the adverse outcomes; this new pharmacogenomic test106 helps limit the use of benzopyrones (particularly coumarin) to those patients with a functional, nonpolymorphic CYP2A6 enzyme to reduce the risk of hepatic toxicity.
Indeed, a combined approach107 with conventional physical therapy108 and benzopyrones as an additional medical treatment gets new attention,109 despite the fact that the systemic use of benzopyrone is an unsettled issue due to its hepatic toxicity. Nevertheless, until now, pharmacology has provided few therapeutic options for the management of lymphedema, except the use of antibiotics to treat and prevent recurrent episodes of soft-tissue infections, which is critical for the complete eradication of pathogens in patients with lymphedema who have a poor ability to clear pathogens and an impaired immune system trafficking mechanism due to abnormal biology of the lymphedematous tissues.105
Infections and inflammation of skin and soft tissues are more common among patients with lymphedema due to lymph stasis, which allows microorganisms that are retained in the tissue fluid to grow. In these patients, not only do commensal bacteria (eg, Staphylococcus epidermidis and coagulase-negative strains, S aureus, and Corynebacterium) proliferate and become pathogenic, but also other pathogenic microbes originating from the perineal region (eg, Enterococcus, Enterobacter, Acinetobacter, Proteus, Escherichia coli, and Pseudomonas) cause various conditions of infection: lymphangitis, erysipelas, and necrotizing fasciitis (Figure 5).110,111
The decreased ability of the immune system to neutralize and eradicate the microorganisms penetrating the integuments means that these organisms change into a persisting form with a decreased metabolism.112,113 Therefore, acute episodes of a unique inflammatory condition, known as dermatolymphangioadenitis (DLA), should be treated with a wide-spectrum antibiotic therapy for 3 to 7 days, and low-dose (benzathine) penicillin should be further administered on a long-term basis to prevent the revival of dormant microbes and decrease the frequency of DLA as a chronic form (Figure 1).38-40
There has been a growing interest in the role of inflammation in the pathogenesis of lymphedema114 because, in experimental models, the targeted inhibition of these inflammatory pathways significantly improved the structure and function of the lymphatic system.15,116
Inhibition of transforming growth factor β (TGFβ) expression improved lymphatic function by diminishing inflammation, the migration of T helper 2 type (Th2) cells, and the expression of profibrotic Th2-type cytokines.41 Hence, proper inhibition of lymphangiogenesis by Th2-type cytokines is considered a potent means of improving lymphangiogenesis by manipulating the antilymphangiogenic pathways.42 Also, excessive generation of immature lymphatic vessels, which are essential for the pathogenesis and maintenance in lymphedema, is dependent upon an interaction between CD4 and macrophages, and lymphedema can be improved by inhibiting the activation of T helper 1 type and T helper 17 type cells.43 These two lines of investigation show a promising future for pharmacological approaches to improve the treatment and prevention of lymphedema.
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