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1.
A multicenter prospective randomized clinical trial was undertaken to investigate the effectiveness of the Australian Medical Sheepskin (AMS) in the prevention of sacral pressure ulcers in somatic nursing home patients. Patients were randomized at admission and were then followed daily for 30 days. The experimental group received usual care plus an AMS as a layer on the mattress within ultimately 48 hours after admission; the control group received usual care only. Usual care was all the care that nursing wards normally applied for pressure ulcer prevention without any further standardization for this study. A total of 588 patients were randomized (293 control and 295 experimental group) and the data of 543 patients could be analyzed (272 from the control and 271 from the experimental group). The incidence of sacral pressure ulcers grade 1 or higher was significantly lower in the experimental group than in the control group (8.9% vs. 14.7%). In a multilevel analysis on the incidence of pressure ulcers adjusted for Braden risk score, age, and gender, it shows an odds ratio of 0.53 (95% confidence interval: 0.29–0.95), meaning a significant protective effect of the AMS. These results are in line with the results of two earlier trials on the AMS in hospital patients. The majority of patients in our trial that used an AMS rated it positively, but one‐third found the sheepskin too warm. We conclude that the AMS is an effective aid in the prevention of sacral pressure ulcers in nursing home patients.  相似文献   

2.
The purpose of this study was to develop and validate a pressure ulcer risk assessment for acute hospitals. This tool was developed in a cohort of 342 patients with a mean age 63 years (SD 19.82) and validated in a second cohort of 165 patients with a mean age 68 years (SD 18.40). Risk factors for inclusion on The Northern Hospital Pressure Ulcer Prevention Plan (TNH‐PUPP) were identified from the literature then examined and weighted using logistic regression. Risk factors included on the TNH‐PUPP were requires assistance to move in bed (odds ratio [OR] 5.15; 95% confidence interval [CI]: 2.49–10.65), admission to intensive care during current admission (OR 2.98; 95% CI: 1.33–6.67), aged ≥65 years (OR 2.81; 95% CI: 1.24–6.36), reduced sensation (OR 2.29; 95% CI: 1.19–4.42), and cognitive impairment (OR 2.26; 95% CI: 1.09–4.67). The TNH‐PUPP was validated in a prospective sample. The new tool had high diagnostic validity (area under the receiver operating curve=0.86), consistent in the validation sample (area under the receiver operating curve=0.90). The TNH‐PUPP has a moderate positive predictive value (development=0.50; validation=0.13), and a high negative predictive value (development=0.94; validation=0.99) enabling low‐risk patients to be screened out, as noncandidates for pressure ulcer prevention interventions. An accurate pressure ulcer risk assessment has been developed and validated, which identifies a high‐risk group to whom limited pressure ulcer prevention resources should be directed. The TNH‐PUPP facilitates effective resource allocation and is likely to reduce unnecessary patient harm and costs from pressure ulcers in acute hospitals.  相似文献   

3.
Risk factors for pressure ulcers among elderly hip fracture patients   总被引:6,自引:0,他引:6  
The purpose of this study was to estimate the incidence of hospital-acquired pressure ulcers among elderly patients hospitalized for hip fracture surgery and to identify extrinsic factors that are associated with increased risk. We conducted a secondary analysis of data abstracted from medical records at 20 hospitals in Pennsylvania, Texas, New Jersey, and Virginia. Participants were patients aged 60 years and older admitted with hip fracture to the study hospitals between 1983 and 1993. The incidence of hospital-acquired pressure ulcers was 8.8% (95% confidence interval 8.2%-9.4%). After adjusting for confounding variables, longer wait before surgery, intensive care unit stay, longer surgical procedure, and general anesthesia were significantly associated with higher pressure ulcer risk. Extrinsic factors may be important markers for high pressure ulcer risk in hospitalized hip fracture patients. Although it is not possible to eliminate factors such as requiring an intensive care unit stay or having a long surgical procedure, it may be possible to develop interventions that minimize pressure ulcer risk in patients who experience these factors.  相似文献   

4.
This study aims to clarify (i) the incidence of pressure ulcers in neonates admitted to the neonatal intensive care units (NICUs) and (ii) risk factors of pressure ulcer development. All infants admitted to the NICU and kept in incubators from seven hospitals during the study period were recruited to the study. Each infant was given skin examination every day by nurses, and risk factors were collected three times a week by one researcher. The incidence of the pressure ulcers was calculated, and the risk factors for pressure ulcers were determined by using univariate and multivariate analysis. Eighty‐one infants were involved in the study. A total of 14 pressure ulcers occurred in 13 infants during the 11‐month study period, the incidence was 0·01 persons per day and cumulative incidence rate was 16·0%. Seven (50·0%) of 14 pressure ulcers were located on the nose. Multivariate analysis identified the following risk factors: skin texture (Dubowitz neonatal maturation assessment scale: skin texture score of 1 point or lower) [odds ratio 7·6; 95% confidence interval (CI) 1·58 –36·71, P = 0·012] and endotracheal intubation usage (odds ratio 4·0; 95% CI 1·04–15·42, P = 0·042).  相似文献   

5.
OBJECTIVE: To describe the pressure ulcer prevalence, stage and body location, and demographic characteristics of patients with pressure ulcers at a tertiary care adult hospital and a tertiary care pediatric hospital. DESIGN: Prevalence survey. SETTING AND SUBJECTS: A total of 513 inpatients, including 416 adults admitted to a tertiary care hospital and 97 children admitted to a tertiary care pediatric hospital. Only inpatients with mental health-related diagnoses were excluded. INSTRUMENTS: The Kinetics Concepts International's Prevalence and Incidence Study Collection Form was used to assess variables, including demographic information; presence, location, and stage of pressure ulcers; and presence of special support surfaces. METHODS: All patients had head-to-toe skin assessments performed during an 8-hour period by teams of 3 multidisciplinary staff members. Kinetics Concepts International's Prevalence and Incidence Program software and Microsoft Excel were used for data entry and analysis. RESULTS: Combined pressure ulcer prevalence was 26.3%, with 29.2% in adult patients and 13.1% in pediatric patients. The most common body locations for pressure ulcers were the sacrum (22.1%), heels (14.8%), ears (12.9%), elbows (10.6%), and the buttocks (6.8%). Forty-eight percent of the ulcers were stage I, 36% Stage II, 6% Stage III-IV, and 10% unable to stage. CONCLUSIONS: Overall combined pressure ulcer prevalence and common body locations were consistent with findings from comparable hospitals. Patients at the extreme ends of the age spectrum had an increased risk of pressure ulcers. Stage I and II ulcers occurred most frequently. Potential prevention and early management strategies may be effective in decreasing the prevalence of these ulcers.  相似文献   

6.
7.
ABSTRACT

To estimate risk factors for pressure ulcers, we developed quantitative definitions for each of the nine general areas of risk outlined by the 1989 National Pressure Ulcer Advisory Panel (NPUAP) and evaluated each of these factors in a group of spinal cord injured patients by means of a retrospective chart review at a spinal cord injury referral center serving the New England area. All patients (n=364) admitted to the spinal cord injury service between January 1, 1989 and December 31, 1990 were studied.

We identified a pressure ulcer in 81 of 364 patients (22.3 percent). In the univariate analyses, pressure ulcers were associated with Frankel groups A to B with an odds ratio (OR) of 5.7 (95 percent confidence interval 2.8 to 11.9), low albumin with an OR of 4.9 (95 percent confidence interval 2.8 to 8.6), low hemoglobin with an OR of 2.5 (95 percent confidence interval 1.5 to 4.1), age ≥60 years with an OR of 1.9 (95 percent confidence interval 1.2 to 3.2) and three independent measures of co-morbidity: Cumulative Illness Rating Scale (CIRS) with an OR of 3.7 (95 percent confidence interval 2.1 to 6.3), Charlson Index with an OR of 2.2 (95 percent confidence interval 1.3 to 3.8), and International Classification of Diseases, Ninth Revision, Clinical Modification count with an OR of 4.2 (95 percent confidence interval 2.4 to 7.2). In the logistic regression model, low albumin, CIRS and Frankel grade A to B and history of pressure ulcers were predictors. This study demonstrates that the NPUAP criteria can be adapted and quantified for spinal cord injured patients who are at high risk for pressure ulcers.  相似文献   

8.
PURPOSE: The purpose of this study was to determine whether certain Braden subscales or subscores were more important than others or the summative score in predicting stage I to IV pressure ulcers among older adults receiving home health care. DESIGN: A retrospective cohort study (secondary analysis) was used. SETTING AND SUBJECTS: The cohort sample included 1684 nonhospice patients who were not receiving intravenous therapy and who were admitted to the Intermittent Skilled Nursing Division of a large midwestern home health care agency between January 1995 and March 1996. The patients were > or =60 years and free of pressure ulcers. METHODS: Demographic data and data on the Braden Scale were extracted from admission information. Patient records were followed forward chronologically to 1 of 2 outcomes: development or absence of pressure ulcers (ie, free of pressure ulcers upon discharge, institutionalization, death, or the end of the study period). RESULTS: Following admission, a stage I to IV pressure ulcer developed in 107 subjects (incidence = 6.3%). Cox regression analysis revealed that activity and moisture subscale scores predicted pressure ulcer development. Regression modeling of individual Braden Scale subscores (response categories) revealed that problems with friction/shear, being very limited in mobility, and being constantly moist, very moist, or occasionally moist predicted pressure ulcer development. When the overall level of risk was added to each of these models, the Braden Scale summative score was most strongly related to pressure ulcer development. No simplified scale improved risk prediction. CONCLUSIONS: When the Braden Scale was used, the summative score rather than any subscale or subscore best predicted pressure ulcer risk among the older adults receiving home health care.  相似文献   

9.
Treatment of pressure ulcers requires removing the cause as well as eliminating factors that interfere with healing. There are no reports on the effect of medications prescribed for underlying diseases on pressure ulcers. Accordingly, the aim of this study was to investigate whether medications prescribed to patients with pressure ulcers could be a factor that influences pressure ulcer healing. We retrospectively reviewed the records of patients with pressure ulcer who were admitted to Chiba University Hospital between June 2009 and June 2015. A total of 110 patients were included in this study. In univariate analysis, there were significant differences in corticosteroid use and total caloric intake. Logistic regression analysis was performed for four factors, including corticosteroid use and total caloric intake, which were significant at P < .05, plus the two factors malignancy and body mass index, which were previously reported as factors that may affect pressure ulcer healing. The results showed that corticosteroid use [odds ratio (OR) 0.205, 95% confidence interval (CI): 0.046 to 0.911, P = .037] and total caloric intake [OR 1.002, 95% CI: 1.000 to 1.003, P = .006] were significant risk factors influencing pressure ulcer healing. This study revealed that use of corticosteroids and total caloric intake could be risk factors affecting pressure ulcer healing. These findings provide useful information for the management of pressure ulcer.  相似文献   

10.
To evaluate the ability of research nurses to identify pressure ulcers, the authors assembled digital photographs of the skin of 160 consenting elderly patients (80% African American, 63% women). The series included 39 photos of pressure ulcers, 109 of normal skin, and 12 of other skin conditions, determined by consensus by two experts (D.J.M. and S.H.K.). Photos were packaged electronically into eight blocks of 20, with pressure ulcer prevalence ranging from 20% to 30% per block. The eight blocks were duplicated to create two sets of 160 photos each. Each of six raters (experienced clinical research nurses), working independently, evaluated the 320 photos as if each photo depicted a different patient. For analysis, the ratings were collapsed into binary determinations (any pressure ulcer vs. none). The overall sensitivity and specificity of the ratings were 0.97 (95% confidence interval: 0.94, 0.98) and 0.81 (95% confidence interval: 0.77, 0.86), respectively. Rater-specific prevalence (range: 31.8-47.5%) exceeded the true prevalence (24.4%). Inter- and intrarater reliability coefficients were 0.69 and 0.84, respectively. Trained research nurses can accurately classify pressure ulcers from photographs, even when patients are largely non-White and the photographs depict pressure ulcers spanning all pressure ulcer stages.  相似文献   

11.
OBJECTIVE: We sought to measure the incidence of pressure ulcer development at a university health center in Turkey, and to determine whether the Waterlow Pressure Sore Risk (PSR) Scale score predicted pressure ulcer development, stage, or number of ulcers. DESIGN: We prospectively evaluated patients who were hospitalized at our university-based medical center. SETTING AND SUBJECTS: We analyzed data from 22,834 patients hospitalized at the Baskent University Adana Teaching and Medical Research Center in Ankara, Turkey from January 1, 2004 to December 31, 2004, including 360 patients who developed pressure ulcers. INSTRUMENTS: The Waterlow PSR Scale was used to assess pressure ulcer risk. In addition, age, sex, the ward or unit in which the patient was hospitalized, reason for hospitalization, and location and stage of ulcers were collected on a data form designed specifically for this study. METHODS: A single nurse physiotherapist assessed all patients daily during their hospitalization. When a pressure ulcer was diagnosed by the nurse physiotherapist, a physician staged the pressure ulcers based on the US National Pressure Ulcer Advisory Panel (NPUAP) staging system. RESULTS: Three hundred sixty out of 22,834 patients developed 1 or more pressure ulcers, resulting in an incidence rate of 1.6%. Most ulcers (59.2%) occurred in patients hospitalized in the intensive care unit (n = 213). A positive correlation between the Waterlow PSR Scale score and number of ulcers per patient (r: 0.178, P < .01) was identified. No significant correlation was found linking Waterlow PSR Scale score and ulcer stage or the development of a single ulcer. CONCLUSION: We found significantly lower pressure ulcer incidence rates than those commonly reported in the literature, which we believe is principally attributable to short hospital stays and a strong emphasis on preventive nursing care. While high Waterlow PSR scale Scores correlated positively with development of multiple ulcers, this did not predict ulcer stage or the presence of a single pressure ulcer.  相似文献   

12.
Polypharmacy, which refers to the situation of a patient taking more medications than is clinically necessary, has become a major problem in recent years. Although the effects of medications on pressure ulcers have been reported, there are no reports on the impact of the total number of medications on pressure ulcers. The purpose of this study was to investigate the effect of number of medications on the severity of pressure ulcers. Participants included 94 patients who were admitted to Chiba University Hospital with pressure ulcers between April 2013 and March 2021. Univariate analysis identified ulcer depth, weight loss and anticoagulant use to be factors that contributed to the severity of pressure ulcers. Multiple regression analysis was performed for six variables, namely, the number of medications, ulcer depth, weight loss and anticoagulant use, as well as diabetes status and total serum protein level, which have been reported to be associated with pressure ulcers in previous studies. The following independent risk factors were identified: weight loss (β 0.207, 95% confidence interval [CI] 0.700–3.193; p = 0.003), anticoagulant use (β 0.161, 95% CI 0.271–3.088; p = 0.020) and ulcer depth (β 0.719, 95% CI 7.172–10.329; p < 0.001). The number of medications was not a significant factor. This study revealed that the number of medications a patient is taking does not affect the severity of pressure ulcers. The findings should provide useful information for the management of pressure ulcers.  相似文献   

13.
The objective of this article was to study characteristics of pressure ulcer patients and their ulcers, pressure ulcer preventive and treatment measures in four Indonesian general hospitals. A multicentre cross‐sectional design was applied to assess pressure ulcers and pressure ulcer care in adult patients in medical, surgical, specialised and intensive care units. Ninety‐one of the 1132 patients had a total of 142 ulcers. Half (44·0%) already had pressure ulcers before admission. The overall prevalence of category I–IV pressure ulcers was 8·0% (95% CI 6·4–9·6), and the overall nosocomial pressure ulcer prevalence was 4·5% (95% CI 3·3–5·7). Most pressure ulcer patients had friction and shear problems, were bedfast, had diabetes and had more bedridden days. Most ulcers (42·3%) were category III and IV. One third of the patients had both pressure ulcers and moisture lesions (36·3%) and suffered from pain (45·1%). The most frequently used prevention measures were repositioning (61·5%), skin moisturising (47·3%), patient education (36·3%) and massage (35·2%). Most pressure ulcer dressings involved saline‐impregnated or antimicrobial gauzes. This study shows the complexities of pressure ulcers in Indonesian general hospitals and reveals that the quality of pressure ulcer care (prevention and treatment) could be improved by implementing the recent evidence‐based international guideline.  相似文献   

14.
Frequent manual repositioning is an established part of pressure ulcer prevention, but there is little evidence for its effectiveness. This study examined the association between repositioning and pressure ulcer incidence among bed‐bound elderly hip fracture patients, using data from a 2004–2007 cohort study in nine Maryland and Pennsylvania hospitals. Eligible patients (n=269) were age ≥65 years, underwent hip fracture surgery, and were bed‐bound at index study visits (during the first 5 days of hospitalization). Information about repositioning on the days of index visits was collected from patient charts; study nurses assessed presence of stage 2+ pressure ulcers 2 days later. The association between frequent manual repositioning and pressure ulcer incidence was estimated, adjusting for pressure ulcer risk factors using generalized estimating equations and weighted estimating equations. Patients were frequently repositioned (at least every 2 hours) on only 53% (187/354) of index visit days. New pressure ulcers developed at 12% of visits following frequent repositioning vs. 10% following less frequent repositioning; the incidence rate of pressure ulcers per person‐day did not differ between the two groups (incidence rate ratio 1.1, 95% confidence interval 0.5–2.4). No association was found between frequent repositioning of bed‐bound patients and lower pressure ulcer incidence, calling into question the allocation of resources for repositioning.  相似文献   

15.
Nutritional status has been associated with the development and healing of pressure ulcers. This study aimed to examine the dietary intake of adults who had pressure ulcers (n = 75) and a control group with no pressure ulcers (n = 100), randomly selected from those receiving treatment from community nurses. All participants were considered to be at risk of developing pressure damage. Dietary intake was assessed using a 24-hour recall method (completed by 84 participants) and a nutritional questionnaire (completed by all 175 participants). The mean age of participants was 79 +/- 6 years and 70% were women. Patients who had pressure ulcers had a lower energy intake (mean difference -185 kcal, 95% confidence interval -413 to 43) and intake of protein (mean difference -6.73 g/day, 95% CI -16.20 to 2.74) but neither factor achieved a standard level of statistical significance. However, when protein was categorised into quartiles, a significantly higher proportion of participants with low intake had pressure ulcers on chi-squared analysis (p = 0.043). More participants who had pressure ulcers required assistance with eating (odds ratio 4.55, 95% CI 1.53 to 13.54) and more had experienced recent taste changes (odds ratio 3.28, 95% CI 1.19 to 9.10). While these differences were significant, there were few major differences between those who had pressure ulcers and the control group. A number of participants in both groups had poor nutritional intake and other risk factors for malnutrition were also found. Poor nutrition is a problem for all patients receiving community nursing care, not just those with pressure ulceration. Due to acknowledged difficulties in recording nutritional intake in elderly patients, further assessment of dietary intake in those receiving community nursing services should be undertaken to support these results.  相似文献   

16.
BackgroundData on predictors of nonroutine discharge among patients undergoing hepatopancreatic surgery remain poorly defined. We sought to define factors associated with nonroutine discharge to home with home health care or to a skilled nursing facility or intermediate care facility and determine the impact of discharge destination on outcomes after hepatopancreatic surgery.MethodsThe Nationwide Readmissions Database was queried for individuals who underwent hepatopancreatic surgeries 2010–2014 and were discharged home with home health care or to a skilled nursing facility/intermediate care facility.ResultsA total of 42,189 patients underwent hepatopancreatic surgery. Of those, 2,825 (6.70%) were discharged to a skilled nursing facility or intermediate care facility, whereas 10,925 (25.9%) were discharged with home health care. A majority of patients underwent major hepatectomy (N = 14,516, 34.4%) or minor pancreatectomy (N = 13,824, 32.8%). Compared with patients discharged home, patients discharged to a skilled nursing facility or intermediate care facility were older (median age: 60 years, interquartile range: 50–68 vs 73, 67–79) and had more comorbidities (median score: 3, interquartile range: 1–8 vs 4, interquartile range: 2–8; P < .001). Type of operative procedure was not associated with discharge to a skilled nursing facility versus with home health care. Rather, patients with extreme loss of function, based on preoperative assessment, had 2.76 times higher odds of discharge to a skilled nursing facility or intermediate care facility versus with home health care (odds ratio 2.76, 95% confidence interval 1.98–3.85). Similarly, older (odds ratio 1.06, 95% confidence interval 1.06–1.07) and female patients (odds ratio 1.37, 95% confidence interval 1.25–1.51) were more likely to be discharged to a skilled nursing facility or intermediate care facility versus with home health care.ConclusionOne in four patients undergoing hepatopancreatic surgery were readmitted within 90 days of surgery. Age, severity of comorbidities, and perioperative course, including incidence of complications, were associated with nonroutine discharge.  相似文献   

17.
Background: The strength of nursing home residence as a prognostic indicator of outcome following hip fracture has not previously been examined in Australia. The aim of the study was to examine the influence of nursing home residency on mortality after sustaining an acute hip fracture. Methods: A prospective study of all adults aged 65 years and over presenting to a single tertiary referral hospital for management of a proximal femoral fracture between July 2003 and September 2006. Residential status was obtained at admission. Patients were followed up to September 2007 (minimum 12 months). Relative risk values for mortality were calculated comparing nursing home residents with non‐nursing home residents. Survival analysis was performed. Results: Relative risk of death was higher in nursing home patients compared with non‐nursing home patients. The difference was greater in the immediate period (30 days) post‐injury (relative risk 1.9, 95% confidence interval 1.0–3.6, P= 0.04) than after 12 months (relative risk 1.5, 95% confidence interval 1.2–1.8, P= 0.001). Survival analysis showed that 25% of patients in the nursing home group died by 96 days post‐injury, compared with 435 days in the non‐nursing home group. Conclusions: Nursing home residence confers an increased risk of death following hip fracture; this difference is greater in the immediate post‐injury period. The relative risk of death decreases over time to equal previously reported comparative mortality rates between nursing home residents and community dwellers without hip fracture.  相似文献   

18.
Chronic ulcers are a common problem in long‐term care. Residents with ongoing ulcers are often frail and at risk for mortality. This study evaluated the relationship between wound characteristics and other health predictors with 6‐month mortality in nursing home residents. The subjects included were nursing home residents seen by the wound consult service from 1998 to 2007 with an ongoing chronic ulcer. This was a retrospective cohort study. Data were manually and electronically abstracted for each resident. Six‐month mortality was collected as the primary outcome. Statistical comparisons were made using logistic regression with a final multivariant model. Four hundred and forty residents were seen with 411 records reviewed. Ulcer area was not associated with mortality; however, chronic ulcer number was associated with 6‐month mortality with an odds ratio of 1·32 (95% CI 1·07–1·63). Other significant risk factors included heart failure, dementia, cancer, depression and blindness with all factors having an odds ratio greater than 1·75. Higher haemoglobin and venous insufficiency were protective of 6‐month mortality. Ulcer number is an important predictor for 6‐month mortality. The presence of multiple ulcers and comorbid health concerns may influence discussion of prognosis for healing and for potential end of life discussions.  相似文献   

19.
OBJECTIVE: This retrospective chart review study was conducted to determine the prevalence and incidence of pressure ulcers, and the contribution of known risk factors toward the predicted occurrence of pressure ulcers in a long-term rehabilitation setting. SUBJECTS AND SETTING: A continuous series of 170 adult men with a mean age of 69.2 years were studied during a 1-year period. METHODS: Patient charts were reviewed retrospectively for risk factors and documentation of pressure ulcer development by 1 researcher on a data recording form. RESULTS: The pressure ulcer prevalence was 12% and the incidence over the 1-year observation period 6%. Using the odds ratio test, significant risk factors in the sample were identified as hypoalbuminemia (odds ratio = 11:1), low diastolic blood pressure (odds ratio = 4.6:1), stool and urine incontinence (odds ratio = 1.5:1), and peripheral edema (odds ratio = 3.5:1). CONCLUSION: Specific characteristics in this sample of patients in a long-term rehabilitation center contributed to the increased risk for pressure ulcer development. Risk assessment based on knowledge of specific risk factors, prevention, and early intervention is crucial to lowering the prevalence and incidence of pressure ulcers in this setting.  相似文献   

20.
《The surgeon》2022,20(4):e144-e148
The utilisation of prone positioning has been vital during the COVID-19 pandemic, however risks the development of anterior pressure ulcers. An observational study was performed to examine the prevalence of pressure ulcers in this population and define risk factors. Eighty-seven patients admitted to critical care were studied. Of 62 patients with >1 day in prone position, 55 (88.7%) developed anterior pressure ulcers, 91% of which were anterior. The most commonly affected site were the oral commisures (34.6%), related to endotracheal tube placement. Prone positioning (p < .001) and the number of days prone (OR 3.11, 95% CI 1.46–6.62, p = 0.003) were a significant risk factors in development of an anterior ulcer. Prone positioning is therefore a significant cause of anterior pressure ulcers in this population.  相似文献   

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