Assessing evidence supporting redistribution of pressure for pressure ulcer prevention: a review

The formation and underlying causes of pressure ulcers (PUs) are quite complex, with multiple influencing factors. However, by definition pressure ulcers cannot form without loading, or pressure, on tissue. Clinical interventions typically target the magnitude and/or duration of loading. Pressure magnitude is managed by the selection of support surfaces and postural supports as well as body posture on supporting surfaces. Duration is addressed via turning and weight shifting frequency as well as with the use of dynamic surfaces that actively redistribute pressure on the body surfaces. This article shows that preventative interventions must be targeted to both magnitude and duration and addresses the rationale behind several common clinical interventions--some with more scientific evidence than others.     

The role of support surfaces and patient attributes in preventing pressure ulcers in elderly patients

Nurses caring for elderly patients often need to select support surfaces that reduce the likelihood of pressure ulcers, but there is little information about the effectiveness of different support surfaces. This randomized trial compared two support surfaces and investigated patient attributes related to the risk of developing a pressure ulcer. Eighty-four elderly patients were nursed on a convoluted or solid foam overlay and assessed three times a week for pressure ulcers. Stepwise Cox proportional hazards regression revealed a statistically significant relationship between the risk of developing a pressure ulcer and the variables mobility and type of support surface. © 1993 John Wiley & Sons, Inc.     

Pressure ulcer research: where do we go from here?

The physiology and pathology of pressure defence mechanisms have been little studied and are not understood. No critical risk factors have been identified and populations of patients identified as being 'at risk' by risk calculators and clinical impression often have small numbers of patients who are really susceptible to pressure ulcers (PUs). Prevention trials must therefore have large sample sizes to enable significant results to be observed, or must be carried out in patient populations with a high PU incidence. Many trials have been carried out in orthopaedic patients but results may not be generalizable. Measurement of physical parameters (e.g. interface pressure), useful for adapting support surfaces for individual patients and designing new support systems, is unlikely to identify the aetiology of PUs and, without validation from clinical trials, predict the efficacy of interventions. In future it may be better to sample other groups, such as critical care patients for trials, as the findings might prove more generalizable. The effects of interventions should also be researched at the healthcare system level rather than that of product or risk factor. However, only the physiological study of PU aetiology is likely to advance our knowledge and ability to prevent PUs more effectively.     

Evaluating the Pegasus Trinova: a data hierarchy approach

Understanding the efficacy of patient support surfaces is essential if pressure sore management is to be both efficient and effective. However, laboratory and clinical studies in this area are fraught with well recognized problems. This investigation reports a combination of laboratory, randomized controlled trial (efficacy data) and measures of effectiveness to illustrate the beneficial role of a new dynamic integrated mattress and seat cushion system: the Pegasus Trinova. Successful prevention of sores among a vulnerable patient population, along with positive comments regarding the system's comfort and 'user-friendliness' are supported by laboratory measures of interface pressure to provide a hierarchy of data. Such an approach may present one solution to the lack of timeliness of most mattress clinical trials, thus allowing decisions regarding new support surfaces to be made upon the basis of evidence, not on anecdote or solely upon marketing claims.     

Quick Reference Guide for Clinicians

This Quick Reference Guide for Clinicians contains highlights from the Treatment of Pressure Ulcers, Clinical Practice Guideline No. 15, which was developed by a private-sector panel of health care providers and a consumer. Selected aspects of pressure ulcer assessment and treatment are presented. Topics covered include assessment of the patient and pressure ulcer(s), tissue load management, ulcer care, management of bacterial colonization and infection, operative repair of the pressure ulcer, and education and quality improvement. Algorithms are included to show the sequence of events related to the overall care of the individual with a pressure ulcer, nutritional assessment and support, management of tissue loads, ulcer care, and management of bacterial colonization and infection. Tables and forms are included as aids for selecting irrigation devices, cleansing solutions, support surfaces, and assessing the pressure ulcer and the patient's nutritional status.     

Providing correct pressure-relieving devices for optimum outcome

Pressure redistributing (PR) support surfaces are positioned by manufacturers against different levels of patient vulnerability to developing pressure ulcers. However, there is no agreed method through which such linkage between a patient and an appropriate support surface can be made. This lack of clarity leads to new devices being positioned in a manner not representative of their eventual use in clinical practice. Using a data hierarchy approach, three strands of evidence (interface pressure, a pilot national survey and a randomized controlled trial) are presented to illustrate, and support, the repositioning of the Viaclin dynamic mattress overlay (formerly the Pegasus Overture) from use with medium-risk patients to use with higher-risk patients. The need for amendment is seen most strikingly in the two clinical studies featured in this article, during which 87% of all patients nursed on the Viaclin dynamic mattress overlay were at high- to very high-risk of developing ulcers.     

What is the best support surface in prevention and treatment,as of 2012, for a patient at risk and/or suffering from pressure ulcer sore? Developing French guidelines for clinical practice

IntroductionThe use of support surfaces in the prevention and treatment of pressure ulcers prevention is an important part of care for a patient at risk and/or suffering from sore(s).ObjectivesDefine which support surfaces to use in prevention and treatment of at-risk and/or pressure sore patients.MethodologyA systematic review of the literature querying the several Pascal Biomed, PubMed and Cochrane Library databases from 2000 through 2010.Results (Grade A)In prevention, a structured foam mattress is more efficient than a standard hospital mattress. An alternating pressure mattress is more effective than a visco-elastic mattress limiting the occurrence heel pressure ulcers, but those that do occur are more serious. A low-air-loss bed is more efficient than a mixed pulsating air mattress in prevention of heel pressure ulcers. Some types of sheepskin can reduce sacral pressure ulcer incidence in orthopedic patients. Use of an overlay on an operating table limits the occurrence of peroperative and postoperative pressure ulcers. An air-fluidized bed improves pressure ulcer healing.DiscussionThe data in the literature are not always relevant and do not suffice to dictate a clinician's choices. We are compelled to recognize the methodological limitations of many studies, the lack of corporate interest in conducting such studies and the relatively small number of available trials. However, the effectiveness of some support surfaces reaches a sufficient level of evidence, especially when they are associated with postural, hydration and nutritional measures.ConclusionSupport surfaces are recommended in prevention and treatment of patients at risk and/or already suffering from pressure ulcer, and their use should constitute part of an overall preventive or curative strategy.     

An integrative review of pressure relief in surgical patients

Effective patient positioning has been an important issue throughout the history of the nursing profession. Pressure ulcers result from prolonged pressure, which causes skin, tissue, or muscle damage. Surgical patients present a unique challenge in preventing pressure ulcers because they are immobile and unable to perceive the discomfort of prolonged pressure. The purpose of this integrative review is to examine risk factors associated with pressure ulcer development in surgical patients and to examine pressure-relieving support surfaces to determine if they significantly reduce intraoperative tissue pressure and result in a lower incidence of postoperative pressure ulcers. Most of the research focuses on long-term care units, with little attention given to the acute care setting. Although the pathophysiology and etiology of pressure ulcers are well documented by years of research, the OR as an etiologic factor is largely undefined.     

Risk factors associated with pressure ulcer development in critically ill traumatic spinal cord injury patients

Critically ill spinal cord injury (SCI) patients are at high risk for pressure ulcers. Research is needed to identify risk factors for pressure ulcers. The aim of this study was to investigate risk factors and outcomes of pressure ulcers in critically ill SCI patients. This is a retrospective cohort study. Data were gathered from medical records of adult patients with SCI admitted to surgical intensive care units. Ninety-four SCI patients participated in this study. Clinical variables associated with pressure ulcers were as follows: fecal management systems, incontinence, acidosis, support surfaces, steroids, and additional equipment. Hypotension was the strongest predictor of pressure ulcers. Nursing interventions may address risk factors and improve patient outcomes.     

Microclimate: A critical review in the context of pressure ulcer prevention

Pressure ulcers are caused by sustained mechanical loading and deformation of the skin and subcutaneous layers between internal stiff anatomical structures and external surfaces or devices. In addition, the skin microclimate (temperature, humidity and airflow next to the skin surface) is an indirect pressure ulcer risk factor. Temperature and humidity affect the structure and function of the skin increasing or lowering possible damage thresholds for the skin and underlying soft tissues. From a pressure ulcer prevention research perspective, the effects of humidity and temperature next to the skin surface are inextricably linked to concurrent soft tissue deformation. Direct clinical evidence supporting the association between microclimate and pressure ulceration is sparse and of high risk of bias. Currently, it is recommended to keep the skin dry and cool and/or to allow recovery periods between phases of occlusion. The stratum corneum must be prevented from becoming overhydrated or from drying out but exact ranges of an acceptable microclimate are unknown. Therefore, vague terms like ‘microclimate management’ should be avoided but product and microclimate characteristics should be explicitly stated to allow an informed decision making. Pressure ulcer prevention interventions like repositioning, the use of special support surfaces, cushions, and prophylactic dressings are effective only if they reduce sustained deformations in soft tissues. This mode of action outweighs possible undesirable microclimate properties. As long as uncertainty exists efforts must be taken to use as less occlusive materials as possible. There seems to be individual intrinsic characteristics making patients more vulnerable to microclimate effects.     

Evaluating support surfaces for patients in transit through the accident and emergency department

Little attention has been given to pressure area care for patients admitted via the accident and emergency department (A & E) in UK hospitals, despite evidence that they may wait for considerable periods on hard surfaces, placing them at risk of tissue damage. The literature was searched, and in the absence of existing guidelines to evaluate the suitability of the standard hospital trolley for use with emergency admission patients, criteria were developed by consensus among stakeholders with relevant expertise who were employed in an acute NHS hospital trust. Audit of the existing patient support surfaces using these criteria revealed deficiencies in all of them. Some of the problems identified were related to deterioration of the equipment; others were related to its design. The criteria were used to inform the purchase of new equipment, and a system of auditing to improve pressure area care for emergency admission patients has been established in the trust. The initiative has also drawn attention to significant omissions in the literature relating to pressure area care, including the need to evaluate patient comfort and inclusion of consumer views.     

Care study: providing effective care in palliative nursing

Currently, nurses are under great pressure to demonstrate effective, evidence-based patient care. In this article a single case study will be used to demonstrate that care can be based on recent research within a palliative care setting to produce effective outcomes. Research-based interventions, which were used to provide care for a patient who will be referred to as Maria, will be discussed and evaluated to illustrate the contribution that evidence-based practice made to her nursing care. Although it is a single case study and the findings cannot be generalized, it is suggested that this article can be used to demonstrate the need for accurate interpretation of assessment data, illustrate the use of research to support nursing interventions in pain management, constipation and skin pressure damage, and show that empirical evidence alone may not be a sufficient basis for care and that moral issues must be taken into account.     

Preventing pressure ulcers—Are pressure-redistributing support surfaces effective? A Cochrane systematic review and meta-analysis

ObjectivesTo undertake a systematic review of the effectiveness of pressure redistributing support surfaces in the prevention of pressure ulcers.DesignSystematic review and meta-analysis.Data sourcesCochrane Wound Group Specialised Register, The Cochrane Central Register of Controlled Trials, Ovid MEDLINE, Ovid EMBASE and EBSCO CINAHL. The reference sections of included trials were searched for further trials.Review methodsRandomised controlled trials and quasi-randomised trials, published or unpublished, which assessed the effects of support surfaces in preventing pressure ulcers (of any grade), in any patient group, in any setting compared to any other support surface, were sought. Two reviewers extracted and summarised details of eligible trials using a standardised form and assessed the methodological quality of each trial using the Cochrane risk of bias tool.ResultsFifty-three eligible trials were identified with a total of 16,285 study participants. Overall the risk of bias in the included trials was high. Pooled analysis showed that: (i) foam alternatives to the standard hospital foam mattress reduce the incidence of pressure ulcers in people at risk (RR 0.40, 95% CI 0.21–0.74) and Australian standard medical sheepskins prevent pressure ulcers compared to standard care (RR 0.48, 95% CI 0.31–0.74). Pressure-redistributing overlays on the operating table compared to standard care reduce postoperative pressure ulcer incidence (RR 0.53, 95% CI 0.33–0.85).ConclusionsWhile there is good evidence that higher specification foam mattresses, sheepskins, and that some overlays in the operative setting are effective in preventing pressure ulcers, there is insufficient evidence to draw conclusions on the value of seat cushions, limb protectors and various constant low pressure devices. The relative merits of higher-tech constant low pressure and alternating pressure for prevention are unclear. More robust trials are required to address these research gaps.     

The effect of differing support surfaces on the efficacy of chest compressions using a resuscitation manikin model.

AIM: External chest compression (ECC) efficacy is influenced by factors including the surface supporting the patient. Air-filled support surfaces are deflated for cardiopulmonary resuscitation, with little evidence to substantiate this. We investigated the effect that differing support surfaces had on ECC efficacy using a CPR manikin model. METHODOLOGY: Four participants carried out four cycles of ECC with an assistant ventilating. The subjects were blinded to the seven support surfaces and the order was randomised. For each participant/surface combination, ECC variables and the participants' perceptions were measured. RESULTS: Participants produced effective ECC with the manikin on the floor (mean proportion correct, 94.5%; mean depth, 42.5 mm). Compared with the floor: the proportion of correct ECC was less for the overlay inflated (P<0.05); the depth of ECC was less effective (30-37 mm) for the overlay inflated/deflated and low-air-loss inflated and foam mattresses (P<0.05). The foam mattress, overlay inflated/deflated, and low-air-loss inflated were perceived as being less stable and as having reduced ECC efficacy compared with the floor. There was no difference or agreement, regarding subjects' perceptions or ECC variables, between the support surfaces or between inflated/deflated air-filled support surfaces. CONCLUSION: The efficacy of ECC is affected by the support surfaces. There seems little evidence to substantiate deflating all air-filled support surfaces for CPR.     

Study on the Usefulness of Sit to Stand Training in Self-directed Treatment of Stroke Patients

[Purpose] This study sought to determine the usefulness of sit to stand training in self-directed treatment of stroke patients. It examined the effect that sit to stand training has on balance and functional movement depending on the form of support surfaces. [Subjects and Methods] Thirty stroke patients were randomly sampled and divided into an unstable support surface group (15) and stable support surface group (15). In order to identify the effect depending on the form of support surfaces, 15 minutes of support surface training plus + 15 minutes of free gait training was performed. [Results] The results of the unstable support surface training showed that the corresponding sample t-test results were significant for the 7-item 3-point Berg balance scale, timed Up and Go test, and 6-minute walking test. The independent samples t-test, showed that there were significant outcomes in step length on the affected side, and step length on the unaffected side. [Conclusion] In conclusion, the sit to stand training on stable support surfaces was not as effective as the training using unstable support surfaces, but it is a simple and stable exercise with less risk of falls during training. It can also be performed alone by the patient in order to increase endurance and dynamic balance ability. Therefore, it is considered a useful exercise that can be performed alone by the patient outside the treatment room.Key words: Stroke, Self-directed treatment, Sit to stand     

Nutritional support in the postoperative period

Nutritional support is used frequently as a treatment modality in the postoperative patient. Indications for nutrition support, patient selection, mode of administration, contents of solutions and complications of therapy are issues that the consulting internist must address. The role of a nutrition support team and optimal communication between the consultant and members of the surgical staff are emphasized.     

Layered closure of lacerations

The cause, depth, and location of a laceration are major determining factors in its treatment. In all cases, the wound must be completely cleansed with irrigation under pressure and then examined radiographically if necessary and debrided. Successful repair depends on understanding and using the principles of wound healing. The skin's greatest strength is in the dermal layer, and the best repair results when the entire depth of the dermis is accurately approximated to the entire depth of the opposite dermis. Accurate coaptation of the epidermis gives a polished effect to the repair but does not contribute to its strength. Fat and muscle do not support sutures. Full-thickness sutures may safely be used only on palmar and plantar surfaces. With an extensive laceration or one near a joint, a splint or sling may be needed. The wound should be examined a couple of days after suture placement for signs of infection.     

Assessing learning styles: practical tips for patient education

Nurses must facilitate and support patient and family decision-making and improvement in health outcomes using instructional skills. Complex patient needs and nursing responsibilities necessitate thoughtful consideration for maximizing the effectiveness of patient teaching encounters. This article reviews assessment of patient learning styles in combination with context for an individualized approach, as well as motivation for adult learners as a framework for organization of patient teaching. Methods and modes of patient teaching are discussed as well as tips for overcoming barriers to planning and implementing patient teaching.     

How to support the basic sciences

It has become axiomatic that basic science faculty and research programs at medical schools must support themselves. The days when excess clinical revenue was used to support basic research are long gone. With the pressure of managed care and faculty practice programs on medical school budgets, it appears that medical school leaders are looking everywhere but at clinical programs for critical support of biomedical research at their institutions, even as NIH support shrinks.     

The occipital and sacral pressures experienced by healthy volunteers under spinal immobilization: a trial of three surfaces.

BACKGROUND: The development of a pressure ulcer is of great significance to the life-long rehabilitative management of the person with a spinal cord injury, and may indeed delay and repeatedly interfere with that process. That the period preceding admission to the specialized spinal injury unit is crucial with regard to pressure ulcer development is evident in the professional literature. Both anecdotal and empirical evidence indicates that a significant number of pressure ulcers occur as a result of management provided prior to admission, and that such ulcers are more likely to occur in those patients who have undergone a transfer process from a hospital distal to the specialist unit on a hard spinal board. AIM: In consideration of this and of the fact that, in Ireland, the interhospital transfer of spinal injured patients has usually involved the employment of such spinal boards to achieve immobilization, this study sought to identify whether or not the pressure experienced by individuals at two anatomical locations was dependent on the support surface employed. METHODOLOGY: Pressure under the occiput and sacrum of three healthy volunteers immobilized on three support surfaces was measured using air-filled pressure-measuring sacks. The surfaces employed were an uncovered spinal board; a spinal board with inflatable raft devise; and a full-body vacuum splint. DISCUSSION: Marked reductions in pressure were measured when using the inflatable raft and the vacuum mattress. The results of this study will provide a basis for a larger study and, through that, the formulation of recommendations for standardized practice along a national care pathway.