Putting Evidence into Practice: Using evidence-based strategies to improve wound care practice Linda...
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Putting Evidence into Practice: Using evidence-based strategies to improve wound care practice Linda Cowan, PhD, ARNP, FNP-BC, CWS Research Health Scientist,
Putting Evidence into Practice: Using evidence-based strategies
to improve wound care practice Linda Cowan, PhD, ARNP, FNP-BC, CWS
Research Health Scientist, Research Service, Department of Veterans
Affairs Medical Center, North Florida/South Georgia Veterans Health
System Gainesville, Florida Associate Professor, UF College of
Nursing Gainesville, Florida
Slide 2
Financial Disclosures: Research projects funded by: Veterans
Administration Biomonde Healthpoint Celleration Medline Hollister
Employed by or Consultant for: University of Florida College of
Nursing WHS Consultants, Inc. CEUFAST, Inc.
Slide 3
Objectives Describe Evidence Based Practice processes vs.
practices Identify key differences between EBP, PI/QI, and Research
tools Discuss ways to appraise and apply research evidence to
clinical practice Review examples of wound related research
evidence (venous leg ulcers, biofilm, pressure ulcers)
Slide 4
Value of Evidence in Clinical Care
Slide 5
When clinicians have access to information, it changes their
patient care management decisions: In 1998, Dr. David Sackett,
using an "evidence cart" on rounds, reported using information
searches to answer 71 clinical questions: 37 (52%) Evidence
confirmed the management decision, 18 (25%) Evidence lead to a new
therapy or diagnostic test 16 (23%) Evidence corrected (changed)
the previous plan.
Slide 6
What is Evidence-Based Practice? EBP is a problem solving
approach to clinical practice that integrates the conscientious use
of best evidence in combination with a clinicians expertise as well
as patient preferences and values to make decisions about the type
of care that is provided.
Slide 7
Types of Clinical Evidence External Evidence: Generated from
rigorous research Important question: Does the evidence generated
by rigorous research still hold true when translated to the real
world? Internal Evidence: Generated from outcomes management;
practice-based evidence (PI/QI/QA) projects Other Sources: Text
books, expert opinion, professional organizations
Slide 8
Getting Started: The Five As* Ask good clinical question
Acquire best evidence Enough evidence to answer question? Appraise
that evidence (level/strength) Is evidence strong? Apply Does
evidence support practice change? Can practice change be
implemented? Assess/Re-assess How did practice change impact
outcomes? *Modified from Duke Universitys The Five As of the
Evidence Cycle available at:
http://eno.duhs.duke.edu/sites/eno.duhs.duke.edu/files/public/guides/evidencecycle.pdf
http://eno.duhs.duke.edu/sites/eno.duhs.duke.edu/files/public/guides/evidencecycle.pdf
Slide 9
Ask Acquire Appraise Apply Assess & Reassess Patient
dilemma Process of evidence-based practice Evidence alone does not
decide add clinical experience and pt. values! Hierarchy of
evidence Richardson, 2007; http://www.cebm.net/?o=1021 Act
Slide 10
Accessed from: Titler, M.G., Kleiber, C., Steelman, V.J.,
Rakel, B.A., Budreau, G., Everett, L.Q., Buckwalter, K.C.,
Tripp-Reimer, T., & Goode C. (2001).The Iowa Model of
Evidence-Based Practice to Promote Quality Care. Critical Care
Nursing Clinics of North America, 13(4), 497- 509. (Used with
permission).
Slide 11
EBP ResearchQI / PI Evidence Summary & Recommendation
Evidence Based Generates External Evidence Generates Internal
Evidence Evidence Utilization Toolboxes: Rules and Tools
Slide 12
ALL PI/QI, Research, & Evidence Summaries start with:
Asking a question Acquiring the Evidence Appraising /evaluating the
Evidence (critical appraisal) Determining how the evidence may be
Applied to the question we have asked...
Slide 13
Asking a Searchable Question: USING PICO Population/problem
Intervention (if there is one) or E = exposure Comparison (if there
is one) Outcome of interest PICOT (T=Time span)
Slide 14
THERAPY QUESTION: Jean is a 55 y/o woman who quite often
crosses the Atlantic to visit her elderly mother. She tends to get
swollen legs on these flights and is worried about her risk of
developing deep vein thrombosis (DVT), because she has read quite a
bit about this in the newspaper lately. She asks you if she should
wear elastic stockings on her next trip to reduce her risk of this.
Glasziou et al, 2007
Slide 15
USING PICO Population/problem = passengers on long-haul flights
Intervention = wearing elastic compression stockings Comparison =
no elastic stockings Outcome = development of DVT
Slide 16
After you ask the question, then what? Asking a question
Acquiring the Best Evidence Appraising /evaluating the Evidence
(critical appraisal) Determining how the evidence may be Applied to
the question we have asked... Great Resource: Glasziou, 2007. How
do we nurture Evidence-Based Practice?
http://www.cebm.net/?o=1021http://www.cebm.net/?o=1021
Slide 17
Using PICO to Help Search 1. Underline the key terms 2. Number
the order of importance from 1 to 4 3. Think of alternate
spellings, synonyms, & Truncations 1 2 3 Population/problem =
passengers on long-haul flights Intervention = wearing elastic
compression stockings Comparator/control = no elastic stockings
Outcome = development of DVT 4 Glasziou, 2007;
http://www.cebm.net/?o=1021
Slide 18
Computerized decision support systems linking patient needs to
best evidence Specialized documentation software NICE
(www.nice.org.uk/guidance/)www.nice.org.uk/guidance/ Integrates
best evidence from synthesis to provide comprehensive options and
Guidelines Clinical Evidence
(www.clinicalevidence.com)www.clinicalevidence.com PIER
(http://pier.acponline.org/index.html)http://pier.acponline.org/index.html
Up-to-Date (www.uptodate.com)www.uptodate.com Guidelines
(www.guidelines.gov)www.guidelines.gov Systematic reviews (SRs) and
Meta Analyses Bmjupdates+
(http://bmjupdates.com)http://bmjupdates.com Cochrane Library
Worldviews on evidence-based Nursing
http://www.blackwell-synergy.com/loi/wvn
http://www.blackwell-synergy.com/loi/wvn PubMed Clinical Queries
(http://www.ncbi.nlm.nih.gov/entrez/query/static/clinic
al.shtml)http://www.ncbi.nlm.nih.gov/entrez/query/static/clinic
al.shtml Succinct descriptions of an individual study or an SR ACP
Journal Club (www.acpjc.org)www.acpjc.org EBM
(www.evidence-basedmedicine.com)www.evidence-basedmedicine.com EBN
(http://ebn.bmj.com/)http://ebn.bmj.com/ Original research
articlesBmjupdates+ PubMed Clinical Queries
Slide 19
After you acquire the evidence, then what? Asking a question
Acquiring the Best Evidence Appraising /evaluating the Evidence
(critical appraisal) Determine how evidence can be applied
Slide 20
Critical Appraisal Tools & Skills Systematic Reviews/Meta
Analyses CEBM (www.cebm.net) has free CAT tools to usewww.cebm.net
Common questions Is the question of the research or SR clearly
stated? Does the SR answer the specific question you asked? Is the
info current? Is it likely relevant articles/studies were missed?
Are results applicable to your population of interest? Were
appropriate methods used in research or SR? Large enough samples?
Valid/reliable tools? Homogeneous results vs. heterogeneous results
Meaningful results? Levels of evidence and strength of
recommendations?
Slide 21
Clinical Pearls about Evaluating Research Evidence Know where
to look in articles Gehlbachs book: Interpreting Medical Literature
2006 Read methodology section first (not abstract) Sample large
enough? Sample size power analysis reported? Appropriate study
design for clinical question? Outcome measures described
adequately; valid, reliable? Is enough detail given so that study
could be reproduced? Abstract: Research question/population same as
yours? Methods: Sampling techniques? Robust methods? Results:
Believable and can be applied to your situation?
Slide 22
Know about some Crud detectors Heterogeneity of Meta-analysis
results? Quick look at stem and leaf plots Odds ratio: measure of
relative risk 95% Confidence Intervals Should never contain 1 0.2
0.4 0.6 0.8 1.0 3.0 5.0 7.0 Study1 T(25/152) C(2/160) Study2
T(2/16) C(1/15) Study3 T(35/200) C(3/185) Combined T(80/368)
C(6/360) (Combined sample n= 728) -----X---- OR 0.6(95%CI 0.4-0.8)
-----X--- OR 1.0(95%CI 0.8-1.5) --X OR 0.5(95%CI 0.4-0.6) -X- OR
0.5 (95%CI 0.5-0.6)
Slide 23
After you appraise the evidence, then what? Asking a question
Acquiring the Best Evidence Appraising /evaluating the Evidence
(critical appraisal) Determining how evidence may be Applied.. Is
there sufficient evidence to suggest a recommendation for practice
change? or Are PI or research methods/tools needed?
Slide 24
Remember our Toolboxes? ResearchQI / PI Evidence Summary
Evidence Based Generates External Evidence Generates Internal
Evidence Evidence User
Slide 25
Evidence Summaries Ask Acquire High level (current) evidence
Look for syntheses / summaries / guidelines Systematic
reviews/meta-analyses Appraise Workgroup summarizes appraised
evidence Critical appraisal tools (CATs) AGREE for Guidelines Apply
Make recommendations for applying to practice Policy/procedure need
to be changed/updated? Practice need to be changed? Present report
to change facilitators
Slide 26
Evidence Summary & Recommendations Examples Ear irrigation
in ambulatory care With what device, how much solution, what
solution? Acute urinary retention presenting to ER Should you clamp
Foley catheter every 500cc? CAUTI question for admissions with
Foleys Should you change Foley if admitted w/existing Foley?
Slide 27
Utilizing the PI/QI Toolbox ResearchQI / PI Evidence Summary
Evidence Based Generates External Evidence Generates Internal
Evidence
Slide 28
Quality Improvement (QI) Process Improvement (PI) A process by
which individuals work together to improve systems and processes
with the intention to improve outcomes (unit/facility/organization
specific) A data driven systematic approach to improving care
(typically with a local or organizational focus) Utilizes the PDCA
(PDSA), Systems Redesign, Lean Six Sigma (or similar)
framework/methods PI/QI language Newhouse, 2007
Slide 29
Common PI/QI/QA Language Plan-Do-Check-Act (PDCA/PDSA) Improve
Project, change activity Systems / Processes Satisfaction
Local/unit specific Work flow / work around Barriers / Facilitators
Reduce time/cost Collect and evaluate data Lessons learned
Information found (outcomes): Not generally a risk to pts, not
generalizable (no intent to publish) If any of these are potential
issues, will need IRB review PI/QI approach often in response to
national mandates, quality indicators, skills competency &
educational needs
Slide 30
PI/QI Examples CHF teach back method for discharge instructions
Reduced re-admissions CABG/Valve replacement clinical pathway
Improved interdisciplinary communication, care consistency, patient
communication Pharmacy Lock Box Eliminating unnecessary RN
visits
Slide 31
Research What if there is not enough evidence to answer the
clinical question (evidence summary) or support an improvement
activity (PI/QI)?
Slide 32
Utilizing the Research Toolbox ResearchQI / PI Evidence
Summaries Evidence Based Generates External Evidence
Slide 33
RESEARCH Research is a systematic investigation, including
research development, testing and evaluation, designed to develop
or contribute to generalizable knowledge Theory building / testing
Federal regulatory definitions available in document 38 CFR
16.102(d) http://www.gpo.gov/fdsys/pkg/CFR-2004-
title38-vol1/pdf/CFR-2004-title38-vol1-sec16-103.pdfhttp://www.gpo.gov/fdsys/pkg/CFR-2004-
title38-vol1/pdf/CFR-2004-title38-vol1-sec16-103.pdf
Slide 34
Common Research Language Generate new knowledge Investigate /
research / study Testing / trial / develop / theory / hypothesis
Randomize / random allocation Intervention / experiment /
experimental Sample / Sampling / Controls / Cases Inclusion
criteria/exclusion criteria Informed consent / subjects / n=x
Retrospective chart review / prospective design Cohort / case
controls / comparison group
Slide 35
Research vs. Non-Research Activity If you are not sure,
consider: Is anything outside of usual care being done/proposed?
Any potential risk to patient, pts info, corporate info? What kind
of data? How will data be collected, stored, reported? Is there a
goal to generalize/publish/present this data? IF YES even if it is
being done as a PI project/activity, IRB and human subject
protection review will be necessary. Each Federal agency may have
their own additional layers of approvals: All VA Research must be
reviewed by the IRB and VA Privacy officer, Information security
officer, safety committee and R & D Committees before research
can begin!
Slide 36
Typical Research Proposals Writing the proposal Be specific
about methods, who will: Have access to data, use the data, where
will data be stored (VA server!) etc. Typical components of
proposals for UF IRB follow something like this: Project Title and
List of Investigators Project Abstract Background &
Significance Specific Aims Research Plan (Sample,
Inclusion/Exclusion criteria, Methods of data collection,
Variables, Methods of data analysis, Project Management Plan,
Dissemination Plan, Budget, Timeline) Possible Discomforts and
Risks and Possible Benefits (Human Subjects protection, data safety
monitoring plan) Conflict of Interest of investigators
References
Slide 37
Wound Research Team Members Qingping Yang, MS Randal Wolcott,
MD, CWS Joyce Stechmiller, PhD, ARNP, FAAN Gregory Schultz, PhD
Priscilla Phillips, PhD Daniel Gibson, PhD Micah Flores, PhD Cyndi
Garvan, PhD Briana Foerman, BS Joshua Yarrow, PhD Linda Cowan, PhD,
ARNP, CWS
Slide 38
Purpose of Evidence Syntheses Provides reports of body of
evidence on important clinical practice topics relevant to patients
and these reports help: Develop clinical policies informed by
evidence, Implement effective services to improve patient outcomes
Support clinical practice guidelines and performance measures, and
Guide the direction for future research to address gaps in clinical
knowledge
Slide 39
National Evidence Example Advanced Wound Care Therapies for
Non- Healing Diabetic, Venous, and Arterial Ulcers: A Systematic
Review Completed November 2012, Published May 2013 Full-length
report available on ESP website:
http://www.hsrd.research.va.gov/publications/es p/reports.cfm
http://www.hsrd.research.va.gov/publications/es p/reports.cfm
MEDLINE Search 1995 through August 2012 plus hand-search of
references lists in eligible trials and recent systematic
reviews
Slide 40
SR Review and Appraisal Team: Leads: Neal Foman & Nancy
Greer (Minneapolis VA) Co-Authors/Collaborators Timothy J. Wilt,
MD, MPH James Dorrian, MD Roderick MacDonald, MS Patrick
Fitzgerald, MPH Indulis Rutks, BS Expert Panel/Reviewers Jeffrey
Robbins, DPM Leonard Pogach, MD James Wrobel, DPM, MS Clifford
Buckley, MD Lucille Beck, PhD Margaret Cary, MD Roya Mirmiran, DPM
David Margolis, MD, PhD
Slide 41
Specific Purpose of This Review Evaluate published, RCTs of
efficacy & harms of advanced wound care therapies compared to
either usual care or other advanced therapy Therapies Reviewed:
Collagen Platelet-derived growth factors (PDGF); Negative pressure
wound therapy (NPWT); Biological dressings (BD); Platelet-rich
plasma (PRP); Electromagnetic therapy (EMT); Biological skin
equivalents (BSE); Silver products; Oxygen therapies (hyperbaric
[HBOT], topical, ozone); Keratinocytes; Intermittent pneumatic
compression (IPC)
Slide 42
Inclusion/exclusion Randomized, controlled trials enrolling
human subjects age 18 and over and published in English language
Non-healing, lower extremity, diabetic, venous, or arterial ulcers
(excluded acute wounds, surgical wounds, or pressure ulcers)
Included only studies reporting percentage of ulcers healed at
study completion or time to complete ulcer healing as an
outcome
Slide 43
VA Evidence-based Synthesis Program (ESP) 2012 Literature
Search Flow 1,230 Titles and Abstracts 1,053 Excluded 177 Full Text
Review 130 Excluded 21 from Hand Search Final: 68 Articles (64
Trials) Diabetic: 35 trials ; Venous: 20 trials; Arterial: 1 trial
Other: 8 trials
Slide 44
Outcomes Examined Main Outcomes: Proportion of ulcers healed at
study completion Time to complete ulcer healing Patient global
assessment Return to daily activities Secondary Outcomes: Ulcer
infection Pain Amputation Quality of life Revascularization surgery
All-cause mortality Ulcer recurrence Adverse events Time to
recurrence
Slide 45
Major Findings Our systematic review of randomized controlled
trials found discouragingly LOW strength of evidence regarding the
effectiveness of advanced wound care therapies for treatment of
lower extremity ulcers
Slide 46
Limitations of many of the reviewed studies: - Narrow patient
population, i.e. limited enrollment - Many of the trials were
industry sponsored - Definitions of chronic ulcers vary widely -
Few studies were of long duration - Advanced therapies compared
only to standard therapies in majority of studies - Methodological
quality of studies was fair or poor - Dont know how effective
standard care was prior to entering trials
Slide 47
Future Studies Needed: That will compare advanced therapies to
each other To examine microvascular disease to more clearly
distinguish diabetic from arterial ulcers On advanced wound care
therapies in patients with strictly arterial disease Several
organizations have outlined overall methodological standards for
future research of wound healing therapies
Slide 48
Comparative Effectiveness SR: Treatments for VLU Systematic
Review: benefits & harms of advanced wound dressings on wound
healing, mortality, quality of life, pain, condition of wound bed,
and adverse events for patients with chronic VLU compared with
compression alone Valle et al. (Johns Hopkins University)
Literature reviewed: Jan 1980 thru July 2012 10,676 total studies
initially reviewed Only 37 met criteria (3,990 patients) 0.34% of
studies available
Slide 49
Slide 50
Limited evidence on comparative effectiveness and safety in
this comprehensive systematic review. Of thousands of citations
reviewed, just 38 met criteria. Five studies generated moderate
levels of evidence from which conclusions were drawn on CVU
healing. Poor quality of study design and heterogeneity among
studies limited ability to draw meaningful conclusions related to
QOL, pain, condition of the wound bed, and most adverse events.
Improved healing rates were observed in trials that evaluated
allogeneic bilayered cultured human skin equivalent, Apligraf.
Three times more rapid healing of CVUs than compression alone,
especially for recalcitrant ulcers that were present for over 1
year. However, no added benefit was seen in recurrence rates.
Slide 51
Cadexomer iodine provided a significant advantage in wound
healing rates in one trial Silver-impregnated dressings and Manuka
honey did not significantly affect healing rates of CVUs. More
studies are needed to further explore the role of antimicrobial
dressings in management of CVUs. Hydrocolloid dressings do not
appear more effective than compression alone in healing the chronic
venous leg ulcers. However, all hydrocolloids are not exactly the
same, and the lack of standardization in water vapor transmission
rates among hydrocolloid dressings could potentially affect wound
healing. Low strength of evidence on hydrocolloids indicates cannot
rule out possibility of a benefit, but better studies would be
needed to show a benefit.
Slide 52
Conclusions A few AWDs may be helpful in improving wound
healing, but other important effectiveness and safety outcomes are
still understudied for these AWDs. Our findings do not imply that
AWDs have no merit in the treatment of the CVU. Rather, they
indicate that there is insufficient data to support such claims,
and re-evaluation of the standards for conducting research on AWDs
for CVUs is imperative. We speculate that because many wound
dressings are classified as medical devices, the existing evidence
is partly a response to the less rigorous standards set forth by
the Food and Drug Administration for medical devices.
Slide 53
Antibiofilm Strategies
Slide 54
Evidence Biofilms in chronic wounds Dowd, James, Wolcott
Biofilm Research Wound Research at University of Florida and North
Florida/South Georgia VA: Pigskin explant biofilm model Topical
antimicrobial agents Non-contact non thermal US Larval debridement
therapy (LDT or MDT)
Slide 55
Cadexomer iodine P. Phillips, Q. Yang, E. Sampson, G. Schultz.
Effects of Antimicrobial Agents on an In Vitro Biofilm Model of
Skin Wounds, Advances Wound Care, 1: 299-304, 2010.
Slide 56
Non-contact non-thermal ultrasound 3 day mature PA biofilm
before US 3 day mature PA biofilm after US Bacteria rods
Slide 57
Value of medicinal larvae (maggots) or Larval Debridement
Therapy (LDT) as an anti-biofilm strategy
Slide 58
Results L. Cowan, J. Stechmiller, P. Phillips, Q.P. Yang and G.
Schultz. Chronic Wounds, Biofilms and Use of Medicinal Larvae,
Ulcers, Article ID 487024, 7 pages;
http://dx.doi.org/10.1155/2013/487024,
2013.http://dx.doi.org/10.1155/2013/487024
Slide 59
Before Larval Debridement SA35556 3 day mature biofilm culture
on pig skin explant
Slide 60
After Larval Debridement SA35556 biofilm culture 24 hours after
LDT
Slide 61
Before Larval Debridement PA01 (3 day mature biofilm culture on
pig skin explant)
Slide 62
After Larval Debridement PA01 biofilm culture 24 hours after
LDT
Slide 63
Evidence for larval therapy Enzymatic secretions Antimicrobial
secretions Effective debridement of necrotic tissue Not disruptive
of healthy tissue No known bacterial resistance
Slide 64
Innovation: Biofilm Detector Dye Cowan, L., Schultz, G.,
Gibson, D., Yang, Q., Proof of concept in vitro studies completed
April 2014 Using dental plaque dye to stain biofilm for clinical
visualization Visualization of biofilm allows more effective
treatment (removal of biofilm) and treatment monitoring
Slide 65
Photo of non-inoculated pigskin explants (free of biofilm)
Exposed for 10 seconds to one concentration of dental biofilm dye
and then rinsed vigorously x 1 with 5 ml sterile water
Slide 66
This experiment demonstrated proof of concept that the dental
dye does not significantly stain pigskin tissue, but did stain
biofilm material. These results support the proposed research to
test a similar dye in an open wound on a living rat model where
living tissue and wound fluid with other proteins are present.
Slide 67
Future directions Effective wound bed preparation T-I-M-E*
principles in practice Anti-biofilm strategies Including Larval
Debridement Therapy (LDT) Biofilm Detector Dye Animal studies and
human studies Targeted multiple factor approach Combination
therapies: disruption or removal of biofilm (such as LDT) +
antimicrobials Human RCT in progress: LDT vs. bedside sharp
debridement against biofilm Schultz, G & Dowsett, C. (2012).
Wound bed preparation revisited. Wounds International, 3(1).
Available at:
http://www.woundsinternational.com/practice-development/wound-bed-preparation-revisited/page-2
)http://www.woundsinternational.com/practice-development/wound-bed-preparation-revisited/page-2
Slide 68
PU Treatment
Slide 69
PU Treatments AHRQ: Pressure Ulcer Treatment Strategies:
Comparative Effectiveness Review Number 90 (May 8, 2013).
Interprofessional team of expert authors. Contains 488 pages.
http://effectivehealthcare.ahrq.gov/search-for- guides-reviews-and-
reports/?pageaction=displayproduct&productID=14 91
http://effectivehealthcare.ahrq.gov/search-for- guides-reviews-and-
reports/?pageaction=displayproduct&productID=14 91
Slide 70
Articles published between January 1, 1985, and October 17,
2012 Identified from searches of: MEDLINE (Ovid), Embase
(Elsevier), CINAHL (EBSCOhost),EBM Reviews (Ovid), Cochrane Central
Register of Controlled Trials, Cochrane Database of Systematic
Reviews, Database of Abstracts of Reviews of Effects, and Health
Technology Assessment. Additional studies identified by searching
reference lists from included studies & systematic reviews of
pressure ulcer treatments. Gray literature, including unpublished
data, abstracts, dissertations, and individual product packets from
manufacturers, also reviewed.
Slide 71
Evidence for Tx Moderate Low Air-fluidized beds Alternating
pressure beds Protein-containing nutritional supplements
Hydrocolloid compared to foam Radiant heat compared with other
dressings (stage III-IV ulcers) Electrical stimulation NPWT Low air
loss beds vs. foam Vitamin C Platelet derived growth factor Topical
collagen compared to hydrocolloid or standard care Therapeutic
ultrasound Electromagnetic therapy Light therapy Laser therapy
Hydrotherapy
Slide 72
Insufficient Evidence Alternating pressure chair cushions Zinc
Comparison of different wound dressings Debriding enzymes compared
with dressings or other topical therapies (few studies) Topical
phenytoin Biological agents (macrophage suspension, etc.) Surgical
closure *Maggot studies were also listed here because only 3 poor
quality studies were reviewed (but didnt have our results published
yet!)
Slide 73
Summary Maggots are our friends PU prevention starts with
education and appropriate risk assessment Preventive interventions
should be Evidence-Based and will likely never replace attentive
care & repositioning PU treatments should be evidence-based and
patient need specific (wound characteristics & comorbidities)
More research needed to determine when specific interventions are
likely to succeed or fail.