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Abstract Lipedema is a wide-spread disease with painful accumulations of subcutaneous fat in legs and arms. Often obesity co-occurs. Many patients suffer from impairment in mobility and mental health. Obesity and mental health in turn can be positively influenced by physical activity. In this study we aimed to examine the interrelations between pain and physical activity on mental health in lipedema patients. In total, 511 female lipedema patients (age M = 40.16 ± 12.45 years, BMI M = 33.86 ± 7.80 kg/m 2 ) filled in questionnaires measuring pain (10-point scale), physical activity (7 Items; units per week), and mental health (PHQ-9; WHOQOL-BREF with subscales mental, physical, social, environmental, and overall health). Response surface analyses were calculated via R statistics. Explained variance was high for the model predicting depression severity (R 2  = .18, p < .001) and physical health (R 2  = .30, p < .001). Additive incongruence effects of pain and physical activity on depression severity, mental, physical, and overall health were found (all p < .001). In our study, physical activity and pain synergistically influenced physical, mental, and overall health. Pain did not only lead to low mental health but also interfered with the valuable potential of engaging in physical activity in lipedema patients.

EXECUTIVE SUMMARY Nuclear medicine is an essential tool in the delivery of high-quality medical care, going beyond simple anatomical imaging to the use of physiological processes for both imaging and therapy. Nuclear medicine techniques were applied to the lymphatic system as early as the 1950s by Sherman et al. (1), using 198Au colloid (a beta emitter) as a therapeutic agent for lymph node metastasis. In the late 1960s and early 1970s, the ready availability of technetium-99m (99mTc) allowed more widespread lymphatic imaging (lymphoscintigraphy) with 99mTc colloid. In 1976, Ege (2) studied lymphatic flow in 848 patients, suggesting lymphoscintigraphy could demonstrate variable lymphatic drainage patterns, therefore allowing more accurate radiation therapy fields. In recent years, advances in radiopharmaceuticals and imaging technology have allowed more accurate localization of lymph nodes during lymphoscintigraphy and the development of the sentinel lymph node (SLN) concept. One of the first mentions of SLN was made in 1960 by Gould and Philben (3). They described a specific location of a node that drained the parotid gland. This node, located at the junction of the anterior and posterior facial veins, was described as the node most likely to contain metastasis. It was recommended that this node be investigated first before carrying out complete node dissection (3). The SLN concept was further explored by Cabanas (4) in 1977 when lymphangiography with contrast was used to identify a specific location for lymphatic drainage from the penis. Similar to what was described by Gould and Philben, Cabanas (4) felt that this 1 specific lymph node (located at the superficial epigastric vein by Cabanas for penile carcinoma) could be defined as the SLN for all patients. Individual variations demonstrated in the lymphatic channels and the location of the sentinel node since the initial investigations have confirmed that mapping of lymphatic drainage needs to be carried out for each patient undergoing SLN sampling. SLN identification can be done with optical agents, such as isosulfan or methylene blue, as well as with radiotracers and fluorescent tracers. Localization of the SLN(s) with these techniques in individual patients has allowed a more focused investigation of nodal drainage from a primary tumor site, preventing the morbidity and mortality of complete node bed dissection in patients with no clinical evidence of tumor in the regional nodal basin (5). One difficulty with reviewing the literature describing lymphoscintigraphy is the variety of tracers in use around the world and throughout the history of lymphoscintigraphy. Smaller particles tend to move through the lymphatics more quickly. Some tracers are more likely to stop at the first node they encounter, while others are more likely to move through the lymphatic system more readily, demonstrating channels, node beds, and central lymphatic structures. The tracer used depends on the clinical indication (e.g., sentinel node scintigraphy, lymphedema, or lymphatic vessel integrity), as well as availability and local regulations. In the United States, there are only 2 tracers generally available for clinical use: 99mTc sulfur colloid and 99mTc tilmanocept. In addition, injection techniques, imaging protocols, and camera technology can vary substantially, making comparisons between studies challenging. A discussion of these technical differences is beyond the scope of this document. These appropriate use criteria (AUC) have been developed to describe the appropriate use of radiopharmaceuticals for lymphoscintigraphy in SLN mapping and lymphedema. It is hoped that through these recommendations, nuclear medicine lymphatic imaging techniques will be used to benefit patients in the most cost-effective manner. Representatives from the Society of Nuclear Medicine and Molecular Imaging (SNMMI), the Society for Vascular Medicine (SVM), the Australia and New Zealand Society of Nuclear Medicine (ANZSNM), the American College of Radiology (ACR), the Society of Surgical Oncology (SSO), the European Association of Nuclear Medicine (EANM), the American Head and Neck Society (AHNS), the American Society of Clinical Oncology (ASCO), the American Society of Breast Surgeons (ASBrS), the American College of Nuclear Medicine (ACNM), and the American College of Surgeons (ACS) assembled as an autonomous workgroup to develop these AUC. This process was performed in accordance with the Protecting Access to Medicare Act of 2014 (6). This legislation requires that all referring physicians consult AUC by using a clinical decision support mechanism before ordering any advanced diagnostic imaging services. Such services are defined as diagnostic magnetic resonance imaging (MRI), computed tomography (CT), and nuclear medicine procedures, including positron emission tomography (PET) and others, as specified by the Secretary of Health and Human Services in consultation with physician specialty organizations and other stakeholders (3). Lymphoscintigraphy usually causes trivial radiation exposures for the patient, the surgeon, and the staff handling any specimens that may contain radioactivity. Local regulations that address the handling of radiopharmaceuticals and exposure of the public should always be followed. Radiation exposures are also trivial for pregnant patients and infants exposed to someone who has been injected with lymphoscintigraphic agents labeled with 99mTc. The amount of radiopharmaceutical transferred from the interstitium into the blood and from the blood to the milk is very low. However, when performing an SLN procedure for breast cancer, it seems prudent to recommend the interruption of direct breastfeeding for 24 hours after administration of the radiopharmaceutical. There is a potential for more fetal or infant exposure if the radioisotope dissociates from the radiopharmaceutical; however, exposures will remain very small and likely of no consequence. The rapid decay of 99mTc (6-hour half-life) also allows for rapid return of radiation exposures to background levels within a short time. More detailed information can be found in the document “Advisory Committee on Medical Uses of Isotopes (ACMUI) Sub-Committee on Nursing Mother Guidelines for the Medical Administration of Radioactive Materials” (https://www.nrc.gov/docs/ML1803/ML18033B034.pdf).

In early 2019, the Lipedema Foundation, in partnership with advisors from the Lipedema patient and research communities, launched the Lipedema Foundation Registry — an initial confidential survey to help understand the condition. After three years, we are ecstatic to share this Registry First Look report, providing perspective on the diverse experiences of people with Lipedema. We are tremendously thankful to those who contributed their time and insights, without which this report would not have been possible. This report includes data from the first 521 fully completed Registry surveys from people who believe they have Lipedema, out of 2,000 in-progress responses. These 521 people represent 14,556 years of lived experience with Lipedema, across dimensions including: • Diagnosis: This report focuses on the experiences of 521 people who either report having received a Lipedema diagnosis, or have symptoms sufficient for them to believe they have Lipedema. Data from non-Lipedema populations has been collected, but is not presented in this report. • Amount of time living with Lipedema: Participants include women with less than 10 years duration of the condition, though almost half of survey respondents had lived with Lipedema for more than 30 years at the time of participation. • Geography: Though only in English at this time, the Registry is multinational, with 21% of contributions from outside the US. Much captured here is consistent with existing academic literature and surveys. Findings include: • The Registry data is consistent with research showing the majority of patients first notice symptoms around the time of puberty; more specifically, the Registry data shows peak onset of symptoms between ages 12 and 14. • As widely reported by patients, this data shows long delays between onset and treatment. On average, women sought medical attention 17 years after first noticing symptoms, and received a diagnosis 10 years later. • Participants were able to identify Lipedema-like features in their bodies at frequencies consistent with the medical literature. They found Lipedema-like texture throughout their bodies, though most frequently in the arms and legs. • Both typical and flaring pain are common. Heaviness, bruising, and sensitivity to touch are also common and speak further to patients’ quality of life. After analyzing the data, the Lipedema Foundation team conducted two focus groups with patients to help understand and contextualize the findings. Their interpretations, insights and quotes appear throughout. Though this report is a great start, we hope it can be a tool to advance Lipedema awareness, understanding and care. Key next steps include: • Challenging healthcare professionals to recognize and understand Lipedema, and stop stigmatizing and dismissing patients when they seek care. • Informing scientific hypotheses and the research agenda. • Expanding and diversifying Registry participation, to ensure it represents the true diversity of the Lipedema patient population. Analysis of patient experience reminds us that Lipedema can present in many ways. This diversity asks us to take a closer look at typical descriptions of Lipedema, and this report should influence how we think about anatomical changes in Lipedema and progression of the disorder. These insights must be followed up with formal medical studies, but many hypotheses to be tested have been captured here in the patients’ own voices.

Since 1940, several commonly cited lipedema diagnostic criteria have been published, but no one criteria has been universally adopted by research or clinical communities. A consequence of this is that interpretation of the lipedema research is dependent on knowledge of the lipedema parameters used to recruit lipedema patients into research studies, as they may vary between studies. This table summarizes key areas of agreement and descrepancy between published works and encourages all authors to rigorously document the inclusion and exclusion criteria that serve as the foundation of their clinical studies.

Recommendations: 1.1 Evidence on the safety of liposuction for chronic lipoedema is inadequate but raises concerns of major adverse events such as fluid imbalance, fat embolism, deep vein thrombosis, and toxicity from local anaesthetic agents. Evidence on the efficacy is also inadequate, based mainly on retrospective studies with methodological limitations. Therefore, this procedure should only be used in the context of research. Find out what only in research means on the NICE interventional procedures guidance page. 1.2 Further research should report: • patient selection, including age, effects of hormonal changes (which should include effects seen during puberty and menopause) and the severity and site of disease • details of the number and duration of procedures, the liposuction technique used (including the type of anaesthesia and fluid balance during the procedure), and any procedure-related complications • long-term outcomes, including weight and body mass index changes • patient-reported outcomes, including quality of life. 1.3 Patient selection should be done by a multidisciplinary team, including clinicians with expertise in managing lipoedema. 1.4 The procedure should only be done in specialist centres by surgeons experienced in this procedure.

Lipoedema UK welcomed our involvement with NICE and the opportunity to comment on noncosmetic liposuction (NCL) as a proposed interventional procedure for chronic lipoedema. In response, we have been proactive in capturing the views and experiences of individuals in the UK living with lipoedema and from those who have undergone non-cosmetic liposuction.

Introduction Lipoedema is a chronic and progressive fat distribution disorder characterised by a symmetrical disproportional increase of adipose tissue on the extremities. The disorder is most commonly associated with pain, oedemas, increased tendency of bruising, as well as sensory dysfunctions on the affected limbs, resulting in severely reduced quality of life (QoL) for exclusively female patients. According to current clinical guidelines, conservative treatment of lipoedema consists of manual lymphatic drainage, compression garments, or both combined as complex decongestive therapy (CDT). If conservative therapy does not result in sufficient improvement of symptoms, a surgical intervention, in the form of liposuction under tumescence anaesthesia, may be indicated. This systematic review aims to assess the clinical effectiveness and safety of liposuction in patients with lipoedema (stage I-III) in comparison to any conservative treatment, concerning patient-relevant outcomes, as reduction of pain, reduction in the size of extremities, improvement of QoL, and procedure-related adverse events. Methods A systematic literature search was conducted in December 2020 in five databases to answer customised research questions on clinical effectiveness and safety-related outcomes, yielding in overall 294 potentially relevant hits. One additional hit was identified by hand search. The study selection, data extraction, and assessment of the methodological quality of the studies were performed by two independent researchers. Results A total of six prospective and one retrospective single-arm before/after studies were eligible for inclusion in the current report. Overall, data on safety and clinical effectiveness were evaluated in 492 and 467 female patients of all three lipoedema stages, respectively. The post-operative follow-up ranged from six months to twelve years. Clinical effectiveness Due to the lack of controlled trials, no conclusions on the comparative clinical effectiveness of liposuction for lipoedema could be made. Therefore, data from the prospective single-arm studies comparing patient-reported complaints before and after the liposuction were analysed. All six prospective studies reported statistically significant improvements in pain outcomes pre- vs post-liposuction. These effects were reported beginning at a six-month follow-up but also up to twelve years after the intervention. Reduced sizes of patients’ extremities before-and-after liposuction were reported in three of the included studies, in terms of reduced leg volume and circumference of lower extremities. Statistically significant changes in lipoedema-related QoL outcomes were reported by four studies. Further, reduction in complaints about oedema/swelling, bruising and sensory dysfunctions were reported in some of the included studies.

The purpose is to determine whether surgical therapy of lipedema (stage I, II or III) using Liposuction the pain in the legs compared to the use of complex decongestive therapy (CDT) relevant improved.

Lipedema is a little-known alteration or disorder in the distribution of body fat, which affects almost exclusively women and primarily involves the lower extremities.   Epidemiological data are currently scarce and not helpful to determine the exact incidence of lipedema in the general population; its etiology and physiopathology are not clear enough; its diagnosis is basically clinical, since there are no specific diagnostic tests or enough scientific evidence to support it. However, its clinical manifestations imply deterioration in patients’ quality of life due to the physical, psychological and social impact it entails.   Since about 70% of cases are associated with pain in extremities, these are usually referred to phlebology and lymphology specialists. Treatments to control the edema are not usually successful in reducing the volume of the extremities.   This is in addition to determinants of fashion from the 21st century that demand most women to have slender bodies, while the reality is that overweight and obesity are alarmingly increasing. About 80% of obese patients do not admit to have excess weight, complicating its early diagnosis and prevention of its evolution and, consequently, delaying treatment in patients with this disease.   Due to the clinical presentation and symptoms associated with lipedema, patients are often misdiagnosed with lymphedema, obesity, lipodystrophies or chronic venous insufficiency, and therefore they are not correctly and effectively treated; in the best case scenario, they are administered symptomatic treatments.   In the absence of unified criteria for lipedema, and given the national and international controversy surrounding the term, the Spanish Association of Lymphedema and Lipedema (AEL) has put together a multidisciplinary working group of health professionals from different fields involved in the diagnosis and treatment of this disorder to draft this Consensus Document.   The aim was to answer multiple questions using the documentary evidence and clinical experience available to date.   Is the currently described physiopathology enough to explain lipedema?   Is it a progressive alteration? Does it always get worse?   When you have lipedema, is the progressive increase in body fat percentage normal?   If the main symptom is not the edema: Is manual lymphatic drainage an essential tool for the treatment?   Is it correct to prescribe compression garments in all cases?   What are the most effective treatments?   This working group included the participation of: The Spanish Association of Lymphedema and Lipedema (AEL), the Spanish Chapter of Phlebology and Lymphology (CEFyL) from the Spanish Society of Angiology and Vascular Surgery (SEACV), the Spanish Society of Aesthetic Medicine (SEME), the Spanish Society of Plastic, Reconstructive and Aesthetic Surgery (SECPRE), the Spanish Society of Dietetics and Food Science (SEDCA), the Complutense University of Madrid, and doctors specialized in Physical Medicine and Rehabilitation from the Spanish Society of Rehabilitation and Physical Medicine (SERMEF).   This document includes several chapters on the definition and physiopathology of lipedema, its diagnostic methods, differential diagnosis, classification and treatment using physical, pharmacological and surgical means. It is hoped that it can help people with lipedema and health professionals caring for them.   However, there is still a lot to learn about the etiopathogenesis, diagnosis and treatment of lipedema, so research must continue and be completed with epidemiological studies of its incidence and prevalence, always using an interdisciplinary approach.

EXECUTIVE SUMMARY Lipedema is a chronic condition that occurs almost exclusively in women and manifests as symmetrical buildup of painful fat and swelling in the limbs, sparing the hands and feet. A critical issue is the poorly understood disease biology, which for diagnosed patients results in limited treatment options that, at best, ameliorate the symptoms of lipedema. Individuals who suffer from the disease are further impacted by the absence of diagnostic tools, the lack of public and medical awareness of lipedema, and the stigma associated with weight gain. As a result, the true number of women with lipedema, or its epidemiology, is unknown. Braving these challenges is an active, numerous, and engaged patient community eager to participate in lipedema research. Supported by equally devoted caregivers and researchers, the lipedema field presents an immense opportunity for scientific and medical advancements. To capitalize on this potential, the Lipedema Foundation and the Milken Institute’s Center for Strategic Philanthropy convened leading stakeholders to discuss the current state of lipedema science and identify the key philanthropic research opportunities to advance the field. Little is known about how and why lipedema develops in a patient. Although the disease is reported to occur during puberty and other periods of hormonal changes, why this happens is not understood. The painful fat and swelling in some patients can be so debilitating that their mobility is impaired; yet what drives these symptoms is unknown. Psychosocial issues are also prevalent in women with lipedema, contributing to health burden and complexity of disease management. Furthermore, many patients develop the disease alongside obesity; however, diet, exercise, and weight loss surgery have limited effect on lipedema fat. Although the lack of disease biology is staggering, philanthropic investments in research can leverage the desire of patients to participate in studies to improve their and the entire field’s understanding of lipedema. The convergence of multiple scientific topics around lipedema indicates that addressing these gaps in research will also improve the understanding of hormone, pain and edema, mental health, and metabolic biology. There are no diagnostic tools or tests for lipedema. Diagnosis of lipedema involves a clinical assessment and discussion of the individual’s medical history, a process that is difficult to scale within the current healthcare system. The absence of diagnostic tools to streamline or confirm a clinical diagnosis is a key unmet need, which if addressed by philanthropy, has the potential to dramatically change the trajectory of the disease. Investing in research efforts to advance novel imaging technologies to diagnose lipedema is a promising research avenue that would simultaneously benefit individuals who suffer from the disease and healthcare providers unfamiliar with the condition. The public and medical community are not aware of lipedema. Lipedema was initially described in 1940, yet little knowledge about the disease has permeated the general public, with a concomitant lack of mention in the educational curriculum of medical trainees. Addressing this challenge will require philanthropic efforts to define the disease from a basic, clinical, and diagnostic perspective. A key philanthropic opportunity is support for a lipedema patient registry linked to a tissue biorepository. This effort has the potential to generate and support the needed disease research, while engaging patients as partners in understanding the science of lipedema.

Lipedema is a chronic, incurable, often progressive affliction that occasionally causes significant morbidity. Initially, patients develop a disproportionate increase of body fat in the legs, buttocks and/or arms. Dieting and physical exercise have only limited effect on this disproportionate body fat distribution. The legs may be sensitive and are prone to bruising after only mild trauma. This can deteriorate into severe pain and reduced mobility, ultimately leading to a limitation of activity and social participation. As a result, lipedema patients may often be diagnosed with obesity. Dietary measures generally affect the obesity component but have little effect on the disproportionate body fat distribution. Because lipedema contributes to an increased BMI, even in non-­‐obese patients, a connection between lipedema and excessive calorie-­‐intake or obesity is often incorrectly assumed. In addition to physical problems, lipedema can also lead to psychoso-­‐ cial problems. These are often caused by the failure of consulting professionals to recognize or acknowledge the condition, or because (incorrect) recommendations for weight loss and physical exercise do not contribute to improvements in the complaints. Therefore, it is important to recognize lipedema early so that its accompanying symptoms can be acknowl-­‐ edged at an early stage and be incorporated into an integrated treatment. Little consistent information regarding the diagnosis or treatment of lipedema is found in the literature. Therefore, the goal of this directive is to attempt to establish a consensus for the diagnosis of lipedema and to discuss its symptoms and influencing factors, as well as its effects on activity and social limitations, as these negatively influence the life of the patient.

In 2014 250 women with Lipoedema took part in our survey about their experiences with Lipoedema. The results give a clear picture of what living with Lipoedema is like and reveal that along with the pain and discomfort caused by Lipoedema, many simple tasks that other people regard as straightforward become extremely challenging for people with Lipoedema. Lipoedema UK’s Big Survey 2014 led to the development of the Royal College of GPs’ e-learning course, a half hour course, which enables GPs to recognise Lipoedema and diagnose patients Our survey was created by Lipoedema UK, the Lymphoedema Department at St George’s Hospital, London, and the support of the Lymphoedema Support Network.

Dear Patient, although much has been published about lipoedema during the past decade, this disease continues to be relatively unknown; it is still overlooked and/or mistaken for obesity (overweight) or lymphoedema by many doctors. As a result, the information and therapy instructions given to afflicted individuals is often either incorrect or only partially covers the aspects of this disease. This brochure was designed to help you learn more about lipoedema and to enable you to evaluate and get the most benefit from available therapeutic options. All important information is presented concisely in the form of questions and answers. Please keep in mind that many aspects of this disease remain unclear to date. As with most other diseases (e.g. diabetes, high blood pressure, varicosis, rheumatism, etc.), the symptoms and discomforts are fairly well known, but the underlying causes are not. However, our insights have become much more extensive in the past few years. Since crucial progress has been made in recent years especially with regard to the treatment of lipoedema, there are some very effective measures now available that have a positive impact on all aspects of this chronic disease. This allows you to live a largely „normal“ life without major limitations, at a quality level that until recently was unthinkable. Meanwhile, a wealth of information has become accessible through the internet, where you can get help from specialised doctors, physiotherapists, and other patients afflicted by this disease. There is no longer reason for despair. With the compliments of BSN-JOBST® GmbH