Pressure Injury Prevention, Staging, and Treatment

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Introduction   

When hearing the term HAPI, what comes to mind? The fact is, HAPI may not necessarily generate happy thoughts. Hospital-acquired pressure injuries (HAPIs) are a significant problem in the U.S. today. In fact, pressure injuries in general – whether acquired in a hospital or not – are a global problem.

Many articles have noted that staging and differentiating pressure injuries can be overwhelming for nurses [9]. The purpose of this course is to equip learners with the knowledge needed to reduce pressure injuries, resulting complications, financial risk, and associated death. The information in this course will serve as a valuable resource to nurses from all specialties and backgrounds.

What is a pressure injury?

The National Pressure Injury Advisory Panel (NPIAH) defines pressure injuries as “localized damage to the skin and underlying soft tissue usually over a bony prominence or related to a medical or other device” [17]. Pressure injuries can present as intact or opened skin and can be shallow or deep. Pressure injuries can be quite painful for patients and may require extensive treatment.

Prior to 2016, pressure injuries were termed “pressure ulcers.” However, since ulcer implies “open skin,” the NPIAH changed it to “pressure injury” as the skin is not always open with some of these injuries [22][25].

What causes a pressure injury to develop?

Pressure 

Intense and/or prolonged pressure on the patient’s skin and/or tissue can cause compromised blood flow and decreased sensation [7]. This can occur when patients lay or sit on a bony prominence for an extended period of time [16].  

Bony prominences are areas where you can easily feel a bone underneath the skin or tissue when palpating. These can include the heels, hips, elbows, and tailbone. Approximately two-thirds of all pressure injuries occur on the hip and buttocks area [7]. 

Friction and Shear 

Friction and shear often happen when patients slide down in bed, for example, when the head of the bed is raised. Although “friction and shear” are often used together, there is actually a difference between the two.  

While friction occurs when skin is dragged across a coarse surface (leading to surface-level injuries), shearing occurs when internal bodily structures and skin tissue move in opposite directions (leading to deep-level injuries) [10]. Shearing is often associated with a type of pressure injury called deep tissue injury (occurring in the deeper tissue layers rather than on the skin’s surface) [10].

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What are risk factors for developing a pressure injury? 

There are numerous risk factors for pressure injuries – some of which may not be directly related to the skin. These risk factors can be categorized as either intrinsic factors (occurring from within the body) or extrinsic (occurring from outside of the body) [2][13]. 

Intrinsic Risk Factors 

- Poor skin perfusion (e.g., peripheral vascular disease or smoking) 

- Sensation deficits (e.g., diabetic neuropathy or spinal cord injuries) 

- Moist skin (e.g., urinary incontinence or excessive sweating) 

- Inadequate nutrition (particularly poor protein intake) 

- Poor skin elasticity (e.g., normal age-related skin changes) 

- End of life/palliative (leads to organ failure including the skin) 

- Limited mobility (i.e., bedridden, or wheelchair-bound) 

Extrinsic Risk Factors 

- Physical and chemical restraints (leads to limited mobility) 

- Undergoing a procedure (laying down for extended periods of time) 

- Length of hospital stay (for HAPIs) 

- Medical devices (can lead to medical device-related pressure injuries)

Statistical Evidence 

This section will cover pressure injury statistics both globally and nationally. This section will also cover the impact pressure injuries have on healthcare.

What is happening on a global scale? 

In a global study, researchers found that the prevalence (all cases) and incidence (new cases) of pressure injuries in 2019 were 0.85 million and 3.17 million, respectively – numbers that have decreased over time [23][25]. Numbers were disproportionately high in high-income North America, Central Latin America, and Tropic Latin America [25]. Numbers were lowest in Central Asia and Southeast Asia. The report revealed that although numbers are high overall, they are much lower than what they were predicted to be, which may be attributed to better prevention and treatment initiatives.

What is happening nationally? 

In the U.S., 2.5 million people develop pressure injuries each year [1]. This number does not account for the many people trying to manage pressure injuries on their own at home (i.e., when family acts as the caregiver).  

HAPIs in particular are a growing problem. The most recent data on hospital-acquired conditions in the U.S. shows that from 2014 to 2017, HAPIs increased by 6% (647,000 cases in 2014 to 683,000 in 2017) [6]. Each year 60,000 patients in the U.S. die as a direct result of pressure injuries [1]. 

How do pressure injuries impact healthcare? 

Pressure injuries can be quite costly to the healthcare system. These injuries can lead to persistent pain, prolonged infections, long-term disability, increased healthcare costs, and increased mortality [1].  

In the U.S., pressure injuries cost between $9.1 - $11.6 billion per year [1]. These injuries are complex and can be difficult to treat [7]. Often requiring an interdisciplinary approach to care, the costs of one pressure injury admission can be substantial. Individual care for patients with pressure injuries ranges from $20,900 to $151,700 per injury [1]. Not to mention, more than 17,000 lawsuits are related to pressure injuries every year [1].  

Due to the significant impact that these injuries have on healthcare, prevention and accurate diagnosis is imperative.

Staging and Diagnosis 

The section will cover the staging, varying types, and diagnosis of pressure injuries.  

What is the difference between wound assessment and staging? 

Pressure injury staging is more than a basic wound assessment. Wound assessment includes visualizing the wound, measuring the size of the wound, paying attention to odors coming from the wound, and lightly palpating the area on and/or around the wound for abnormalities. Pressure injury staging, however, involves determining the specific cause of injury, depth of skin or tissue damage, and progression of the disease.  

What are the six stages of pressure injuries? 

According to NPIAP guidelines, there are six types of pressure injuries – four of which are stageable [14]. 

[16] 

Stage 1 

In Stage 1 pressure injuries, there is intact skin with a localized area of non-blanchable erythema (pink or red in color), which may appear differently in darkly pigmented skin. Before visual changes are noted, there may be the presence of blanchable erythema or changes in sensation, temperature, or firmness. Stage 1 pressure injuries do not have a purple or maroon discoloration (this can indicate a deep tissue pressure injury). 

Stage 2 

In Stage 2 pressure injuries, there is partial-thickness loss of skin with exposed dermis. The wound bed is viable, pink or red, moist, and may represent an intact or opened serum-filled blister. Fat (adipose) and deeper tissues are not visible. Granulation tissue, slough (soft moist material, typically yellow or white), and eschar (hard necrotic tissue, typically black in color) are not present. Stage 2 injuries cannot be used to describe wounds associated with moisture-only, skin chaffing, medical adhesives, or trauma. 

Stage 3 

In Stage 3 pressure injuries, there is full-thickness loss of skin, in which fat is visible in the injury, and granulation tissue and rolled wound edges are often present. Slough and/or eschar may be noted. The depth of tissue damage is dependent on the area of the wound. Areas with a significant amount of fat can develop deep wounds.  

Undermining (burrowing in one or more directions, may be wide) and tunneling (burrowing in one direction) may be present. Fascia, muscle, tendon, ligament, cartilage, and/or bone are not exposed. If slough or eschar covers the extent of tissue loss, this would be considered an unstageable pressure injury, not a Stage 3. 

Stage 4 

In Stage 4 pressure injuries, there is full-thickness skin and tissue loss with exposed or directly palpable fascia, muscle, tendon, ligament, cartilage, or bone in the wound. Slough and/or eschar may be visible. Rolled wound edges, undermining, and/or tunneling are often present. The area where the wound is present will determine the depth. As with stage 3 pressure injuries, if slough or eschar covers the extent of tissue loss, this would be considered an unstageable pressure injury. 

Unstageable 

In unstageable pressure injuries, there is full-thickness skin and tissue loss in which the extent of tissue damage within the wound cannot be confirmed because it is covered by slough or eschar. If the slough or eschar is removed, a Stage 3 or Stage 4 pressure injury will be revealed. Stable eschar (i.e., dry, adherent, intact without erythema or fluctuance) on an ischemic limb or the heel(s) should not be removed.  

Deep Tissue Injury 

In deep tissue pressure injuries (also termed: deep tissue injuries or DTIs), there is intact or non-intact skin with localized area or persistent non-blanchable deep red, maroon, purple discoloration, or epidermal separation revealing a dark wound bed or blood-filled blister.  

Pain and temperature changes often precede skin color changes. Discoloration may appear differently in darker-pigmented skin. The injury may resolve without tissue loss or may worsen quickly and open up, revealing the actual extent of tissue injury. Deep tissue pressure injuries should not be used to describe vascular, traumatic, neuropathic, or dermatologic conditions.  

What are other types of pressure injuries? 

Mucosal Membrane Pressure Injury 

Mucosal membrane pressure injuries are found on mucous membranes with a history of a medical device in use at the location of the injury. For example, a wound on the inside of a nostril from a nasogastric tube would be considered a mucosal membrane pressure injury. Due to the anatomy of the tissue, mucosal membrane pressure injuries cannot be staged [18]. 

Medical Device-Related Pressure Injury 

Medical device-related pressure injuries, often associated with healthcare facilities, resulting from the use of devices designed and applied for diagnostic or therapeutic purposes [15]. The resulting pressure injury typically conforms to the pattern or shape of the device which makes identification easier. The injury should be staged using the staging system.  

Hospital Acquired Pressure Injury (HAPI) 

While the general hospital setting places patients at a 5% to 15% increased risk of developing a pressure injury (HAPI), patients in the intensive (or critical) care unit in particular have an even higher risk [17]. Critical care patients typically have serious illnesses and conditions that may cause temporary or permanent functional decline. There is also evidence that pressure injuries in this setting can actually be unavoidable.  

The NPIAP defines “unavoidable” pressure injuries as those that still develop after several measures by the health provider have been taken. These measures include when the provider has (a) evaluated the patient’s condition and pressure injury risk factors, (b) defined and implemented interventions consistent with standards of practice and the patient’s needs and goals, and (c) monitored and evaluated the impact of interventions [20]. There are certain situations in which a critical care patient may have a higher risk of developing unavoidable pressure injuries.  

In one study of 154 critical care patients, researchers found that 41% of HAPIs were unavoidable and those who had a pressure injury in the past were five times more likely to develop an unavoidable pressure injury during their stay [20]. The study also found that the chance of developing an unavoidable HAPI increased the longer patients stayed in the hospital – a 4% risk increase each day.  

How are pressure injuries diagnosed? 

Diagnosing a pressure injury is done by simply staging the injury. The health provider may stage the injury or rely on the nurse’s staging assessment before giving the final diagnosis and initiating treatment. There are tests that may be ordered to help identify the early stages of a developing injury.  

For example, subepidermal moisture assessment (SEM) scanners may help to identify tissue changes early on in patients with darker skin tones [8]. Tests may also be ordered to determine the extent of the damage, disease, or infection caused by a pressure injury. A magnetic resonance imaging test (MRI) can be used to determine if the infection in a stage 4 pressure injury has spread to the bone. 

Prevention and Treatment 

This section will cover various strategies that can be used to prevent and treat pressure injuries. 

What are some ways to prevent pressure injuries? 

Preventing pressure injuries takes more than just one nurse repositioning a patient every two hours. It involves a combination of strategies, protocols, and guidelines that facilities can implement across various departments, specialties, and care team members. The NIAPH recommends the following prevention strategies [19]. 

Risk assessment 

Facilities should use a standardized risk assessment tool to help identify patients at risk for pressure injuries (i.e., the Braden or Norton Scale). Rather than using the tool as the only risk assessment strategy, risk factors should be identified by other means (for example, by gathering a detailed patient history).  

Risk assessments should be performed on a regular basis and updated as needed based on changes in the patient’s condition. Care plans should include risk assessment findings to address needs. 

Skin Care 

Monitoring and protecting the patient’s skin is vital for pressure injury prevention. Stage 1 pressure injuries should be identified early to prevent the progress of disease. These include looking at pressure points, temperature, and the skin beneath medical devices.  

The frequency of assessments may change depending on the department. Ideally, assessments should be performed upon admission and at least once daily. Skin should also be cleaned promptly after incontinence episodes. 

Nutritional Care 

Tools should be used that help to identify patients at risk for malnutrition. Patients at risk should be referred to a registered dietician or nutritionist. Patients at risk should be weighed daily and monitored for any barriers to adequate nutritional intake. These may include swallowing difficulties, clogged feeding tubes, or delays in intravenous nutrition infusions. 

Positioning and mobilization 

Immobility can be related to age, general poor health, sedation, and more. Using offloading pressure activities and keeping patients mobile overall can prevent pressure injuries. Patients at risk should be assisted in turning and repositioning on a schedule. Pressure-relieving devices may be used as well. Patients should not be positioned on an area of previous pressure injury. 

Monitoring, training, and leadership 

Current and new cases of pressure injuries should be documented appropriately and reported. All care team members should be educated on pressure injury prevention and the importance of up-to-date care plans and documentation.  

All care team members should be provided with appropriate resources to carry out all strategies outlined. Leadership should be available to all care team members for support (this may include a specialized wound care nurse or wound care provider). 

How are pressure injuries treated? 

There is no one way to treat a pressure injury. Management of pressure injuries involves a specialized team of care providers and a combination of therapies that aim to target underlying factors and prevent complications [7]. Depending on the stage of the wound and skin risk factors, providers may order specific types of treatments.  

Some pressure injury treatments may include the following [7]. 

- Wound debridement – a procedure in which necrotic tissue is removed from a wound bed to prevent the growth of pathogens in the wound, allowing for healing 

- Antibiotic therapy (topical or systemic) 

- Medicated ointments applied to the wound bed (e.g., hydrogels, hydrocolloids, or saline-moistened gauze to enable granulation tissue to grow and the wound to heal) 

- Nutritional therapies (e.g., referrals to dieticians) 

- Disease management (e.g., controlling blood sugar in diabetes) 

- Pain medications 

- Physical therapy (to keep the patient active) 

The Nurse’s Role 

The section will cover the nurse’s role in preventing pressure injuries and the progression of disease.  

What is the nurse’s role in pressure injury prevention? 

Based on NPIAH guidelines, the Agency for Healthcare Research and Quality (AHRQ) – an agency that monitors pressure injury data for the U.S. – breaks down quality initiatives for preventing pressure injuries in a three-component care bundle [2].  

A care bundle is a combination of best practices that when used together, can lead to better patient outcomes [2]. The care bundle includes skin assessments, risk assessments, and care planning. Nurses should follow the guidelines listed under each component. 

Standardized pressure injury risk assessment 

- Use risk assessment tools and processes to identify patients at risk 

- Do not rely on tools only, use your own judgment as well (tools are meant to guide the assessment) 

- Update risk scores at least once daily and if patient’s condition changes 

- Document findings in the medical record 

- Communicate findings to other staff involved for continuity of care (e.g., informing another nurse during patient handoff reporting) 

Comprehensive skin assessment 

- Identify any pressure injuries that may be present 

- Determine whether there are other areas of skin breakdown or factors that may predispose the patient to develop a pressure injury (e.g., moist skin) 

- Identify other skin issues 

- Perform assessments at regular intervals 

- Document findings in the medical record 

- Communicate findings to other staff involved in care so that appropriate changes can be reported (e.g., informing the nursing assistant) 

- Ask colleague to confirm findings for accuracy (i.e., two-nurse skin checks) 

Care planning and implementation to address areas of risk 

- Create care plans that include each skin risk factor (e.g., nutrition, mobility, and moisture) 

- Update care plans as often as needed if there are any changes in the patient’s condition 

- Evaluate whether care plan was effective by assessing patient response to interventions 

-  Individualize care plans for each patient based on risk assessment scores and other observed risks 

- Identify patient learning needs and implement teaching as needed 

- Document care plan in the medical record 

- Communicate care plan to other staff involved for continuity of care (e.g., informing another nurse during patient handoff reporting) 

How can nurses prevent medical device-related pressure injuries?

The NPIAP outlined best practices to prevent medical device-related pressure injuries in various settings including general care, long-term care, critical care, and pediatric care [20]. The following strategies apply across all settings. 

- Choose the correct size of medical device for the individual. 

- Cushion and protect the skin with dressings in high-risk areas (e.g., nasal bridge). 

- Inspect the skin under and around the device at least daily (if not medically contraindicated).  

- Rotate sites of oximetry probes.  

- Rotate between O2 mask and prongs (if feasible).  

- Reposition devices (if feasible).  

- Avoid placement of device over sites of prior or existing pressure injury OR directly under the patient.  

- Be aware of edema under the device and the potential for skin breakdown. 

- Change rigid C-collar to softer collar when medically cleared (for critical care settings).

How can nurses identify pressure injuries in patients with darker skin tones? 

Research suggests that it may be difficult to note early changes that can lead to the development of a pressure injury in patients with darker skin tones – for one, blanching may not be as visible [8]. This places the patient at a greater risk for the advancement of disease as early identification may be challenging.  

In order to appropriately identify pressure injuries in patients with darker skin tones, nurses should use unique strategies. The NIPAH offers these recommendations for nurses to help accurately identify pressure injuries in this group [8]. 

Identification tips 

- Clean the suspected area beforehand 

- Compare the area to surrounding unaffected areas 

- Compare the area to the opposite laterality if possible (i.e., right versus left elbow) 

- Compare the area to unaffected areas in a different location (i.e., upper back versus chest) 

- Look for differences in skin tautness 

- Look for shining skin changes 

- Palpate for changes in skin temperature 

How can nurses quickly differentiate between pressure injury stages? 

Correct staging of pressure injuries is vital as treatment is determined by the extent of damage, disease, or infection. First and foremost, wounds should be gently cleaned prior to staging as drainage or debris can be mistaken for fat or bone within the wound bed [14].  

Nurses can quickly differentiate between stages by asking these simple easy-to-understand starter questions. A more detailed assessment should follow. 

- Stage 1 versus Stage 2: Is the skin intact? 

Rationale: The skin is always intact in Stage 1. The skin is always open in Stage 2 (or there may be an intact blister present). 

- Stage 2 versus Stage 3: Is the wound bed pink or beefy red? 

Rationale: The wound bed is pink or beefy red in Stage 2. In Stage 3, the wound bed has structures within that may be discolored. 

- Stage 3 versus Stage 4: Does the wound bed contain soft or firm structures? 

Rationale: The wound bed contains softer structures in Stage 3. The wound bed contains firmer structures in Stage 4.* 

- Unstageable versus Stageable: Is any part of the wound bed hidden? 

Rationale: The wound bed is not entirely exposed in an unstageable. The wound bed is exposed in a stageable that is open. 

- Intact DTI versus Stage 1: Is the discoloration light or dark? 

Rationale: The discoloration is dark in a DTI. The discoloration is much lighter in Stage 1. 

- Open DTI versus Stage 2: Is the discoloration in or around the wound bed dark? 

Rationale: There is dark discoloration in or around the wound bed in an open DTI. In stage 2, the discoloration is much lighter (if even present). 

*Nurses should familiarize themselves with the appearance of the various structures that may be present in a wound like fat, fascia, bone, tendon, ligament, etc. Most importantly, nurses should consult the wound care team or health provider if a stage cannot be determined. 

What should patients know? 

Facilities can use the NIAPH prevention strategies to devise teaching plans for patients [19]. Nurses should educate patients and families/caregivers on risk factors, signs and symptoms, prevention tips, and the importance of following through with treatment.  

Nurses should also teach patients to advocate for their own health in order to avoid progression of disease. Here are important tips to teach at any point during the patient’s stay. These tips can apply to nurses working in a variety of settings. 

- Tell the nurse or provider of your medical conditions (needed to identify risk factors) 

- Tell the nurse or provider if you notice any numbness or tingling in your body (potential risk for sensory deficits) 

- Tell the nurse or provider if you have a loss of appetite or trouble eating (potential risk for malnutrition) 

- Clean yourself well after using the restroom (maintains skin integrity) 

- Tell the nurse or provider if you need to use the restroom or need help with cleaning yourself (maintains skin integrity) 

- Tell the nurse right away if you have an incontinence episode (maintains skin integrity) 

- Take all prescribed medications (may include necessary antibiotics or wound-healing medications) 

- Reposition yourself in bed often or tell the nurse if you need help doing so (reduces immobility risk) 

- Tell the nurse or provider if you notice a new discolored area on your skin, or an open area (potential new or worsening pressure injury) 

- Tell the nurse or provider if you notice any changes to your wound (potential worsening pressure injury) 

Quality Improvement 

This section will cover the quality improvement measures in place to reduce pressure injuries. 

What is a pressure injury quality improvement initiative? 

Quality improvement involves setting goals (or initiatives) and standards of care. The goal of quality improvement is to improve patient outcomes at a systematic level where everyone involved is on the same page.  

Although possibly unaware, all care team members are involved in quality improvement. Nursing leaders design, manage, and evaluate program initiatives. Staff nurses and other care team members follow protocols that are often developed from these initiatives.  

The Pressure Injury Prevention Program is a guide designed by the AHRQ to help health facilities implement a structured pressure injury prevention initiative based on quality improvement [12]. Facilities can use the guide as a training toolkit to implement a new quality improvement program [5].  

Initiative Goals: 

- Reduced pressure injury rates 

- Reduced adverse events related to pressure injuries 

- Reduced costs associated with pressure injuries 

- Reduced lawsuits related to pressure injuries 

Ways facilities can implement a prevention program: 

- Address the overall objectives of the prevention program 

- Identify the needs for change and how to redesign practice 

- Develop goals and plans for change 

- Use the NIAPH pressure injury prevention recommended practices 

- Establish comprehensive skin assessment protocols 

- Standardize assessments of pressure injury risk factors 

- Incorporate risk factors into individualized care planning 

- Establish clear staff and leadership roles 

What are some pressure injury quality measures? 

Quality measures are tools that measure a system’s healthcare goals and/or ability to provide high-quality care [11]. In simple terms, quality measures are specific ways that systems (governments, states, organizations, etc.) can show how they are making progress in meeting goals. The AHRQ highlights the following three ways the U.S. measures its progress.  

Number of HAPIs 

The AHRQ measures the number of HAPIs per year. The most recent data is from 2014 to 2017 [6].

Rate of HAPIs per admission 

The AHRQ measures the number of HAPIs per admission related to age groups. The number is measured as a “rate,” meaning the number of HAPIs per 1,000 hospital admissions. The most recent evidence is from 2017 [4]. 

Costs of HAPIs 

Another quality measure is HAPI costs. While the AHRQ does not measure costs of HAPIs every single year, the most recent data is from 2017 [3].  

Deaths related to HAPIs 

Patient mortality rates related to HAPIs are a quality measure (calculated per 1,000 pressure injury cases). The most recent data is from 2017 [6]. 

Conclusion

 Pressure injuries are complex conditions that can lead to poor patient outcomes and a burdened healthcare system. The best strategy in the care of patients with pressure injuries or those at risk is prevention.  

However, preventing these injuries involves more than individual nurses taking specific steps. Prevention of pressure injuries involves a team effort from all members of the care team and a systemic plan for improvement.

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