Jan Kottner, RN, PhD; Katrin Balzer, RN, MA; Theo Dassen, RN, PhD; and Sarah Heinze, MD, PhD
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1 FEATURE Pressure Ulcers: A Critical Review of Definitions and Classifications Jan Kottner, RN, PhD; Katrin Balzer, RN, MA; Theo Dassen, RN, PhD; and Sarah Heinze, MD, PhD Abstract Pressure ulcers are serious health problems. Although a vast amount of literature addresses prevention and treatment strategies, conceptual difficulties persist regarding pressure ulcer definitions, classifications, and distinction from other tissue lesions. Based on a review of terminologies as well as current state of knowledge on pathophysiology and etiology, questions as to what pressure ulcers are and what they are not are addressed. Because pressure forces seem to play a minor role in the development of superficial ulcers, the authors suggest these types of wounds no longer be termed pressure ulcers. A more general term such as decubitus ulcer may be a more appropriate way to characterize wounds that emerge as a result of compressive forces, shearing forces, and/or friction in patients dependent on skilled care. For clinical practice, a two-category classification is proposed: superficial ulcers predominantly caused by friction and deep ulcers predominantly caused by pressure. This simple classification could enhance diagnostic accuracy and reliability. Multidisciplinary communication and research is needed to develop valid and reliable definitions and classifications for pressure ulcer-like wounds. Key Words: pressure ulcers, definitions, concepts, diagnosis, validity Index: Ostomy Wound Management 2009;55(9):22 29 Potential Conflicts of Interest: none disclosed Pressure ulcers are common and their development is complex. Even though terms to describe these wounds and the systems to classify them have undergone numerous revisions, there are still conceptual difficulties. It is important to clarify the concept of pressure ulcers to ensure accurate diagnosis, communication, prevention, and treatment decisions. The purpose of this review is to examine commonly used pressure ulcer definitions and classifications and to propose a simple solution to overcome diagnostic problems and uncertainty in clinical practice. What are Pressure Ulcers? The term pressure ulcer became popular in the early 1970s. 1,2 Previous terms for skin and tissue lesions of this type included bedsores 3,4 or decubitus ulcers. 5,6 Use of the newer term is reflected in the US National Library of Medicine s controlled vocabulary used for indexing articles for MEDLINE and PubMed. Terms such as bedsore or decubitus are synonym entry terms that refer to the medical subject heading (MeSH) pressure ulcer that was not introduced until The Library of Medicine 7 describes a pressure ulcer as an ulceration caused by prolonged pressure on the skin and tissues when one stays in one position for a long period of time, such as lying in bed. The bony areas of the body are the most frequently affected sites which become ischemic under sustained and constant pressure. The Excerpta Medica database (EMBASE) produced by Elsevier uses terms such as pressure ulcer, bedsore, or pressure sore synonymously as key words referring to the subject heading decubitus, introduced in In EMBASE, decubitus belongs to the category skin ulcers. Similarly, in the International Statistical Classification of Diseases and Related Heath Problems (ICD-10), the term pressure ulcer refers to the diagnosis decubitus ulcer (L89), which also belongs to the category diseases Dr. Kottner is an assistant professor, Centre for Humanities and Health Sciences, Department of Nursing Science, Charite-Universitätsmedizin Berlin, Germany. Ms. Balzer is an assistant professor, Nursing Research Group, Institute for Social Medicine, Universitätsklinikum Schleswig-Holstein, Lübeck, Germany. Dr. Dassen is Institute Director, Centre for Humanities and Health Sciences, Department of Nursing Science, Charite-Universitätsmedizin Berlin. Dr. Heinze is a senior physician, Institute of Legal Medicine and Forensic Sciences, Charite-Universitätsmedizin. Please address correspondence to: Jan Kottner, RN, PhD, Department of Nursing Science, Charite-Universitätsmedizin Berlin, Augusteneburger Platz 1, Berlin, Germany; jan.kottner@charite.de. 22 OSTOMY WOUND MANAGEMENT SEPTEMBER
2 PRESSURE ULCERS AND THEIR CLASSIFICATION of the skin and subcutaneous tissue. 8 Further explanations or definitions are not given. Two more detailed definitions that have been widely adopted in clinical practice and research were provided by the European Pressure Ulcer Advisory Panel (EPUAP) and the National Pressure Ulcer Advisory Panel (NPUAP). The EPUAP 9 defines a pressure ulcer as...an area of localised damage to the skin and underlying tissue caused by pressure, shear, friction, and/or a combination of these. According to the NPUAP, 10 a pressure ulcer is...localized injury to the skin and/or underlying tissue usually over a bony prominence, as a result of pressure, or pressure in combination with shear and/or friction. According to the presented definitions, the factor pressure seems to play a key role in pressure ulcer development; whereas, the factors shear and friction are included only in the EPUAP and NPUAP definitions. Pressure. The relationship between long-enduring pressure and tissue damage is well established. 6,11,12 In the sitting or lying position, tissue is compressed between the underlying surface and bony prominences, which explains why most pressure ulcers are located at these body sites. However, the process of tissue breakdown is not yet fully understood. Reviews of the literature 13,14 consolidate pressure ulcer causation into four main theories: 1. Ischemia caused by capillary occlusion. Applied pressure causes capillary occlusion, leading to ischemia. Cellular metabolism is interrupted and metabolic waste products are accumulated; these actions change capillary permeability, leading to edema and cellular infiltration. Increasing the degree and duration of ischemia not only increases changes in membrane permeability and extravasation, but also enhances cellular necrosis and inflammatory reactions. 6,15 2. Reperfusion injury. During the ischemic period, affected tissue reduces metabolism in order to reduce hypoxic and ischemic damage and to preserve tissue function. When reperfusion occurs, liberated free radicals cause inflammatory responses and advance cell damage Lymphatic function is impaired. Pressure reduces the blood supply, which leads to hypoxia. Hypoxia damages the lymphatic vessels; subsequently, lymphatic motility is lost and lymph flow impaired. Metabolic waste products are accumulated, leading to tissue necrosis. 20 Small amounts of pressure seem to increase the lymphatic drainage but when a critical point is exceeded, lymph flow is reduced Mechanical deformation of tissue cells. Pressure leads to large deformation of tissue and cells, consequently triggering volume changes and cytoskeletal reorganization that cause initial damage and tissue breakdown Cell membrane rupture due to cell-to-cell contact also was considered to cause irreversible tissue damage. 20 Regardless of the relevance of these individual theories, it Ostomy Wound Management 2009;55(9):22 29 Key Points The continuing dilemma of what to call pressure ulcers and ever-changing classification definitions hamper progress in their prevention and care. The authors critically review commonly used terms and provide suggestions to overcome diagnostic problems and uncertainty in clinical practice. is highly probable that all four processes contribute to pressure ulcer formation. 14,22 However, pressure-induced tissue damage is related not only to body sites, but also to the type of tissue involved. Muscle and/or subcutaneous fat have been found to be more sensitive to compression than skin and fascia. 11,14,16,25-27 The skin (epidermis and dermis) survives longer periods of ischemia without irreversible damage as compared to muscle tissue. 28 Therefore, pressure-induced tissue injuries always start in the muscle and/or subcutaneous fat; visible skin damage occurs later. 11,14,16,17,19,26-28 Shear. Shear distorts and compresses tissue. Pressure is thought to have a perpendicular effect on tissue; shear exerts diagonal force. However, a firm distinction between pressure and shear is hardly possible because pressure always causes shear and shear causes compressive forces within the strained tissue. 12,17,29 Comparable to pressure forces, deeper structures like muscle and subcutaneous fat are more sensitive and vulnerable than the skin to shear 25 because the skin contains collagen and elastic fibers that provide tensile strength. Friction. Friction inflicts parallel forces on the skin, found to be especially damaging to superficial layers. 25,26,30 Additional factors (eg, moisture due to incontinence) also contribute to the development of superficial skin lesions. However, although the skin can become macerated and inflamed, neither friction nor moisture has been found to lead to deeper tissue layer damage, 14,17,31 an observation recently supported by high-resolution ultrasound scans that show that while friction affects the dermis, deep tissue layers remain intact. 32,33 In summary, according to current pathogenetic knowledge, both compressive and shearing forces seem to primarily affect deeper tissue layers; whereas, friction appears to solely contribute to superficial lesions. Taking these different etiological mechanisms into account, the term pressure ulcer, as defined to date, covers a broad range of types of wounds, but not all of them are necessarily caused by pressure or shear. Therefore, the question remains: Are all pressure ulcers actually pressure ulcers? How are Pressure Ulcers Classified? Pressure ulcers are classified according to their visible clinical appearance. The first well-documented pressure classification system was proposed by Shea in Shea differentiated five categories: the category Closed Pressure Sore, indicating deep tissue injury under intact skin, and grades 1 to 4 where increasing numbers indicate more severe SEPTEMBER 2009 OSTOMY WOUND MANAGEMENT 23
3 FEATURE tissue damage. In subsequent years, this classification was modified several times and new classification systems with varying numbers of categories have been introduced. Most classifications demonstrate increasing numbers of grades or stages to indicate more extensive damage to deeper tissue layers. However, there are glaring distinctions among the definitions and the number of categories comprising the two most popular classifications (EPUAP and NPUAP) (see Table 1). This causes serious problems for international communication and research issues that are being addressed by a joint NPUAP/EPUAP initiative. The degree of reliability of these classifications is contradictory. At present, no empirical evidence recommending a specific pressure ulcer classification system for use in daily practice has been found. 35 In general, it seems that practitioners most often disagree regarding 1) the diagnosis of nonblanchable erythema (grade 1/Stage I pressure ulcers) and 2) the differentiation between superficial pressure ulcers (grade 2 /Stage II pressure ulcers) and moisture-related skin lesions Furthermore, the validity of present pressure ulcer classifications has to be questioned, because, as stated previously, different etiologies lead to different clinical appearances. Tissue breakdown due to pressure and/or shear always starts in the muscle and/or subcutaneous fat, while superficial skin ulcers are caused by friction in combination with other factors detrimental to the skin. In other words, superficial skin lesions possibly located over bony prominences and caused by friction and/or moisture must not be classified as pressure ulcers, because pressure played no role. Although this issue is the topic of frequent discussion, consensus has not yet been achieved. 40,41 Also, from a histological point of view, distinguishing between superficial pressure ulcers and moisture lesions is impossible. 42 On the other hand, empirical evidence exists that superficial skin lesions (grade 2/Stage II pressure ulcers) can be caused by pressure; however, cited studies 18,30,42,43 focused on the skin only. Arao et al 44 described complete decline of epidermis and dermal papillae in a grade 2/Stage II pressure ulcer, but neither the main cause (pressure, shear, or friction) was known nor deeper tissue beneath the superficial skin lesion examined. Investigations that include all tissue layers (ie, superficial skin to subcutaneous fat, fascia, and muscle) are rare. Based on the existing literature, one conclusion appears obvious: When superficial skin lesions due to compression are visible, muscle or subcutaneous fat damage must have taken place because deeper tissue is more vulnerable to pressure forces. 11,14,17,19,26-28 Although the distinction between superficial pressure ulcers and moisture-related lesions seems to be difficult for both etiological and clinical reasons, some authors argue that a correct differentiation is important because pressure ulcers should be recorded as clinical incidents and are interpreted as an adverse event in patient care, which has regulatory consequences. 41,45 This triggers further questions: First, does this mean that other skin problems such as incontinence-related dermatitis or damages due to tape removal are not incidents? Assuming this is true, how should suspected large proportions of false-positive and false-negative judgments of superficial pressure ulcers (as discussed in the systematic review and four empirical studies, mentioned previously) be handled? Regardless of the liability implications of both questions, conceptual definitions and diagnostic instruments that take the actual complexity of superficial skin lesion development into account but do not cause additional uncertainty are needed. Extensive destruction and necrosis of deeper tissue due to long-enduring unrelieved pressure is a well-known phenomenon. A clinically relevant concern is that hours or days after that injury, skin alterations may or may not be visible. 16,19,26,27,40,46,47 Therefore, classifying these lesions correctly hardly seems possible until the full extent of tissue damage can be seen. After all, is it really possible to distinguish between grade1/stage I pressure ulcers and deep tissue injuries when the skin is intact? Although the clinical relevance and course of grade 1/Stage I pressure ulcers are yet not fully understood, it can be assumed that deeper tissue layers already are involved when grade1/stage I pressure ulcers are visible. 14,32,48-50 Furthermore, not all deep tissue injuries progress to full-thickness defects. 6,51 How Can Conceptual Problems Be Solved? Pressure ulcer development is a complex phenomenon; it is apparent that superficial and deep ulcers have different etiologies. Unequivocal definitions as well as classifications of pressure ulcers should clearly characterize these kinds of lesions. One possible solution would be to exclude grade 2/Stage II pressure ulcers from the current classifications to overcome the conceptual problems regarding superficial skin lesions. Instead, they should be labelled as friction or moisture lesions. In that case, only grade 3/Stage III and Stage IV ulcers would be real pressure ulcers caused by pressure. However, this provides only a theoretical solution because in clinical practice, pressure, shear, and friction forces usually coexist. For example, when patients are highly care dependent ie, persons with restricted mobility and activity and moist skin develop tissue lesions, it is difficult to determine the main etiology with certainty. According to the available EPUAP and NPUAP definitions, without knowing the exact etiology, it is impossible to decide whether the lesion is a pressure ulcer. Consequently, when clinicians are not sure whether such tissue damage is caused by pressure, the lesion should not be termed pressure ulcer. A more general term such as decubitus ulcer, as provided by the ICD-10, would be more appropriate. The authors s experience has shown that in clinical practice it often is difficult to establish the distinct causes when decubitus ulcer-like wounds occur. Therefore, it would be logical to exclude etiology from future definitions. Focusing on clinical signs and symptoms may be more promising in enhancing diagnostic accuracy, as long as the treatment remains independent of the etiology. The authors suggest classifying decubitus 24 OSTOMY WOUND MANAGEMENT SEPTEMBER
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5 FEATURE Table 1. Description of pressure ulcer classifications Shea 34 Grade 1: Most apparent clinical presentation is an irregular, ill-defined area of soft tissue swelling and induration with associated heat and erythema overlying a bony prominence. Extreme Grade 1 is a moist superficial irregular ulceration limited to epidermis, exposing underlying dermis and resembling an abrasion. Anatomic limit: dermis Grade 2: Clinically presented as a shallow fullthickness skin ulcer, the edges of which are more distinct. Anatomic limit: subcutaneous fat Grade 3: Irregular full thickness skin defect extending into the subcutaneous fat exposing a draining, foulsmelling, infected, necrotic base that has undermined the skin for a variable distance. Anatomic limit: deep fascia EPUAP 9 Grade 1: Nonblanchable erythema of intact skin. Discoloration of the skin, warmth, edema, induration, or hardness also may be used as indicators, particularly on individuals with darker skin Grade 2: Partial-thickness skin loss involving epidermis, dermis, or both. The ulcer is superficial and presents clinically as an abrasion or blister Grade 3: Full-thickness skin loss involving damage to or necrosis of subcutaneous tissue that may extend down to, but not through, underlying fascia NPUAP 10 Stage I: Intact skin with nonblanchable redness of a localized area usually over a bony prominence. Darkly pigmented skin may not have visible blanching; its color may differ from the surrounding area. Further description: The area may be painful, firm, soft, warmer or cooler as compared to adjacent tissue. Stage I may be difficult to detect in individuals with dark skin tones. May indicate at risk persons (a heralding sign of risk) Stage II: Partial-thickness loss of dermis presenting as a shallow open ulcer with a red-pink wound bed, without slough. Also may present as an intact or open/ruptured serum-filled blister. Further description: Presents as a shiny or dry shallow ulcer without slough or bruising.* This stage should not be used to describe skin tears, tape burns, perineal dermatitis, maceration, or excoriation. *Bruising indicates suspected deep tissue injury Stage III: Full-thickness tissue loss. Subcutaneous fat may be visible but bone, tendon, or muscle are not exposed. Slough may be present but does not obscure the depth of tissue loss. May include undermining and tunneling. Further description: The depth of a Stage III pressure ulcer varies by anatomical location. The bridge of the nose, ear, occiput, and malleolus do not have subcutaneous tissue and Stage III ulcers can be shallow. In contrast, areas of significant adiposity can develop extremely deep Stage III pressure ulcers. Bone/tendon is not visible or directly palpable Continued on next page ulcers into two broad categories: 1) superficial ulcers and 2) deep ulcers. This distinction would have advantages: it is simple and simplicity enhances diagnostic accuracy and reliability. 35 It avoids any kind of assumptions regarding etiology, especially the difficult distinction between pressure and moisture lesions. Avoiding the terms stages or grades clarifies that both categories (superficial and deep) can develop independently from each other and that deep ulcers are not necessarily a progression from superficial ulcers. Additionally, the category unstageable, proposed by the NPUAP, becomes redundant, because the ulcer can be classified as deep. Finally, the authors recommend use of the term nonblanchable erythema (grade 1/Stage I pressure ulcers) and suspected deep tissue injuries as important clinical warning signs for subsequent tissue breakdown. Occurrence of these signs should indicate an urgent need for preventive measures; however, such skin impairments should not be classified as ulcers until tissue damage is visible. While the proposed solution might be too simple for some circumstances, such as research, the importance of pressure ulcer classifications in clinical practice may be overestimated. Grading tissue lesions according to the available pressure ulcer classifications provides only minor guidance for treatment general wound management principles including assessment of the presence of devitalized or necrotic tissue, inflammation or infection, moisture, characteristics of the wound edge, and measurement of the wound size are much more important for guiding care. 52,53 Specification of the anatomical depth of the tissue damage according to currently used pressure ulcer classifications seems to be more suitable for outcome measures or endpoints in clinical trails. Conclusion The recommendations made in this article may provide a means to overcome diagnostic problems and uncertainty in 26 OSTOMY WOUND MANAGEMENT SEPTEMBER
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7 FEATURE Table 1. Description of pressure ulcer classifications continued Shea 34 Grade 4: Clinical presentation resembles that of a Grade 3 except that bone can be identified in the base of the ulceration, which is more extensively undermined with profuse drainage and necrosis. Anatomic limit: no limit Closed pressure sores: Ischemic necrosis in the subcutaneous fat without skin ulceration leading to the development of a bursa-like cavity filled with necrotic debris. Resembling a Grade 3 sore in extent and depth. Overlying pigmented, thickened, and fibrotic skin eventually ruptures, creating a small skin defect draining a large base. Anatomic limit: deep fascia EPUAP 9 Grade 4: Extensive destruction, tissue necrosis, or damage to muscle, bone, or supporting structures with or without full-thickness skin loss NPUAP 10 Stage IV: Full-thickness tissue loss with exposed bone, tendon, or muscle. Slough or eschar may be present on some parts of the wound bed. Often includes undermining and tunneling. Further description: The depth of a Stage IV pressure ulcer varies by anatomical location. The bridge of the nose, ear, occiput, and malleolus do not have subcutaneous tissue and these ulcers can be shallow. Stage IV ulcers can extend into muscle and/or supporting structures (eg, fascia, tendon, or joint capsule) making osteomyelitis possible. Exposed bone/tendon is visible or directly palpable Suspected deep tissue injury: Purple or maroon localized area of discolored intact skin or blood-filled blister due to damage of underlying soft tissue from pressure and/or shear. The area may be preceded by tissue that is painful, firm, mushy, boggy, warmer, or cooler as compared to adjacent tissue. Further description: Deep tissue injury may be difficult to detect in individuals with dark skin tones. Evolution may include a thin blister over a dark wound bed. The wound may further evolve and become covered by thin eschar. Evolution may be rapid, exposing additional layers of tissue even with optimal treatment Unstageable: Full-thickness tissue loss in which the base of the ulcer is covered by slough (yellow, tan, gray, green, or brown) and/or eschar (tan, brown or black) in the wound bed. Further description: Until enough slough and/or eschar is removed to expose the base of the wound, the true depth, and therefore stage, cannot be determined. Stable (dry, adherent, intact without erythema or fluctuance) eschar on the heels serves as the body's natural (biological) cover and should not be removed clinical practice when caring for patients with lesions and wounds that present within the context of skilled care. However, some questions require further investigation. The term decubitus ulcer needs more conceptual clarity ie, what is a decubitus ulcer? What are the etiologic factors, clinical course, and prognosis for lesions in the different categories? Which differentiation is most relevant for clinical decision-making? Answers to these questions are necessary for the development and evaluation of evidence-based diagnostic instruments that facilitate choice of effective, individually targeted prevention and treatment strategies. Validity of taxonomies used in databases or in the ICD-10 could be improved; obviously, decubitus ulcers are not the only diseases of the skin. Answers are forthcoming only through multidisciplinary communication and research. References 1. Lowthian P. Pressure sores: a search for definition. Nurs Stand. 1994;9(11): Lowthian P. The distinction between superficial pressure ulcers and moisture lesions. Skinmed. 2007;6: Astley GM. Bedsores. Am J Surg. 1940;50: Collins EM, Solowinski H. Bedsores their prevention and treatment. Am J Nurs. 1949;49: Conway H, Griffith BH. Plastic surgery for closure of decubitus ulcers in patients with paraplegia. Am J Surg. 1956;91: Kosiak M. Etiology of decubitus ulcers. Arch Phys Med Rehabil. 1961;42: National Library of Medicine Medical Subject Headings. MeSH Descriptor Data Available at: r&field=entry. Accessed September 1, World Health Organisation (WHO). International Statistical Classification of Diseases and Related Health Problems 10th Revision Available at: Accessed September 1, European Pressure Ulcer Advisory Panel (EPUAP). Pressure Ulcer Treatment Guidelines Available at: Accessed September 1, National Pressure Ulcer Advisory Panel (NPUAP). Pressure Ulcer Stages Revised by NPUAP Available at: Accessed September 1, Daniel RK, Priest DL, Wheatley DC. Etiologic factors in pressure sores: an experimental model. Arch Phys Med Rehabil. 1981;62: Defloor T. The risk of pressure sores: a conceptual scheme. J Clin Nurs. 1999;8: Bader D, Oomens C. Recent advances in pressure ulcer research. In: Romanelli M, ed. Science and Practice of Pressure Ulcer Management. London, UK: Springer;2006: Berlowitz DR, Brienza DM. Are all pressure ulcers the result of deep tissue injury? A review of the literature. Ostomy Wound Manage. 2007;53: OSTOMY WOUND MANAGEMENT SEPTEMBER
8 PRESSURE ULCERS AND THEIR CLASSIFICATION 15. Enis JE, Sarmiento A. The pathophysiology and management of pressure sores. Orthop Rev. 1973;11: Salcido R, Donofrio JC, Fisher SB, et al. Histopathology of pressure ulcers as a result of sequential computer-controlled pressure sessions in a fuzzy rat model. Adv Wound Care. 1994;7: Bliss MR. Aetiology of pressure sores. Rev Clin Gerontol. 1993;3: Peirce SM, Skalak TC, Rodeheaver GT. Ischemia-reperfusion injury in chronic pressure ulcer formation: a skin model in the rat. Wound Rep Reg. 2000;8: Salcido R, Popescu A, Ahm C. Animal models in pressure ulcer research. J Spinal Cord Med. 2007;30: Krouskop TA. A synthesis of the factors that contribute to pressure sore formation. Med Hypothesis. 1983;11: Miller GE, Seale J. Lymphatic clearance during compressive loading. Lymphology. 1981;14: Bouten CV, Oomens CW, Baaijens FP, Bader DL. The etiology of pressure ulcers: skin deep or muscle bound? Arch Phys Med Rehabil. 2003;84: Stekelenburg A, Oomens CWJ, Strijkers GJ, Nicolay K, Bader DL. Compression-induced deep tissue injury examined with magnetic resonance imaging and histology. J Appl Physiol. 2006;100: Stekelenburg A, Strijkers GJ, Parusel H, Bader DL, Nicolay K, Oomens CW. Role of ischemia and deformation in the onset of compression-induced deep tissue injury: MRI-based studies in a rat model. J Appl Physiol. 2007;102: Maklebust JA, Sieggreen M. Pressure Ulcers: Guidelines for Prevention and Management, 3rd ed. Philadelphia, PA: Springhouse; Berecek KH. Etiology of decubitus ulcers. Nurs Clin North Am. 1975;10: Edsberg LE. Pressure ulcer tissue histology: an appraisal of the current knowledge. Ostomy Wound Manage. 2007;53: Willms-Kretschmer K, Manjo G. Ischemia of the skin. Am J Pathol. 1969;54: Collier M, Moore Z. Etiology and risk factors. In: Romanelli M, ed. Science and Practice of Pressure Ulcer Management. London, UK: Springer;2006: Witkowski JA, Parish LC. Histopathology of the decubitus ulcer. J Am Acad Dermatol. 1982;6: Krause T, Anders J, von Renteln-Kruse W. Urinary incontinence as a risk factor for pressure sores does not withstand a critical examination. Pflege. 2005;18: Quintavalle PR, Lyder CH, Mertz PJ, Phillip-Jones C, Dyson M. Use of high-resolution, high-frequency diagnostic ultrasound to investigate the pathogenesis of pressure ulcer development. Adv Skin Wound Care. 2006;19: Zulkowski K. Perineal dermatitis versus pressure ulcer: distinguishing characteristics. Adv Skin Wound Care. 2008;21: Shea JD. Pressure sores: classification and management. Clin Orthop Relat Res. 1975;(112): Kottner J, Raeder K, Halfens R, Dassen T. A systematic review of interrater reliability of pressure ulcer classification systems. J Clin Nurs. 2009;18: Bours GJJW, Halfens RJG, Lubbers M, Haalboom JRE. The development of a national registration form to measure the prevalence of pressure ulcers in The Netherlands. Ostomy Wound Manage. 1999;45: Nixon J, Thorpe H, Barrow H, et al. Reliability of pressure ulcer classification and diagnosis. J Adv Nurs. 2005;50: Defloor T, Schoonhoven L, Vanderwee K, Westrate J, Myny D. Reliability of the European Pressure Ulcer Advisory Panel classification system. J Adv Nurs. 2006;54: Beeckman D, Schoonhoven L, Fletcher J, et al. EPUAP classification system for pressure ulcers: European reliability study. J Adv Nurs. 2007;60: Black JM, National Pressure Ulcer Advisory Panel. Moving toward consensus on deep tissue injury and pressure ulcer staging. Adv Skin Wound Care. 2005;18: Doughty D, Ramundo J, Bonham P, et al. Issues and challenges in staging of pressure ulcers. J WOCN. 2006;33: Houwing RH, Arends JW, Canninga-van Dijk MR, Koopman E, Haalboom JR. Is the distinction between superficial pressure ulcers and moisture lesions justifiable? A clinical-pathologic study. Skinmed. 2007;6: Herrman EC, Knapp CF, Donofrio JC, Salcido R. Skin perfusion responses to surface pressure-induced ischemia: implications for the developing pressure ulcer. J Rehabil Res Dev. 1999;36: Arao H, Obata M, Shimada T, Hagisawa S. Morphological characteristics of the dermal papillae in the development of pressure sores. J Tissue Viability. 1998;8: Evans J, Stephen-Haynes J. Identification of superficial pressure ulcers. J Wound Care. 2007;16: Vermillion C. Operating room acquired pressure ulcers. Decubitus. 1990;3: Shah JL. Lesson of the week: postoperative pressure sores after epidural anaesthesia. BMJ. 2000;321: Ek A-C. Prevention, treatment and healing of pressure sores in long-term care patients. Scand J Caring Sci. 1987;1: Witkowski JA. Purple ulcers. J ET Nurs. 1993;20: Barr JE. Questions about staging. Decubitus. 1993;6: Stekelenburg A, Gawlitta D, Bader DL, Oomens CW. Deep tissue injury: how deep is our understanding. Arch Phys Med Rehabil. 2008;89: Schultz G, Mozingo D, Romanelli M, Claxton K. Wound healing and TIME; new concepts and scientific applications. Wound Repair Regen. 2005;13:S1 S Werdin F, Tenenhaus M, Rennekampff HO. Chronic wound care. Lancet 2008;372:
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