Ch 48 skin integrity & wound care Flashcards
, the largest organ in the body, is a protective barrier against disease-causing organisms and a sensory organ for pain, temperature, and touch
Skin
skin has two layers: the
epidermis and the dermis
epidermis and the dermis separated by a membrane, often referred to as the
dermal-epidermal junction.
is the thin outermost layer of the epidermis
stratum corneum
consists of flattened, dead, keratinized cells
stratum corneum
cells originate from the innermost epidermal layer, commonly called the
basal layer
divide, proliferate, and migrate toward the epidermal surface
-After they reach the stratum corneum, they flatten and die
Cells in the basal layer
protects underlying cells and tissues from dehydration and prevents entrance of certain chemical agents
thin stratum corneum
allows evaporation of water from the skin and permits absorption of certain topical medications.
stratum corneum
, the inner layer of the skin, provides tensile strength; mechanical support; and protection for the underlying muscles, bones, and organs
dermis
Collagen (a tough, fibrous protein), blood vessels, and nerves are found in the dermal layer
dermis
, which are responsible for collagen formation, are the only distinctive cell type within the dermis
Fibroblasts (dermis)
such as reduced skin elasticity, decreased collagen, and thinning of underlying muscle and tissues cause the older adult’s skin to be easily torn in response to mechanical trauma, especially shearing forces
Age-related changes
Existing medical conditions and polypharmacy are factors that interfere with wound healing. Aging causes a diminished inflammatory response, resulting in slow epithelialization and wound healing
Age-related changes
decrease in subcutaneous padding over bony prominences, where impaired skin integrity and injury to other tissues are most likely to occur
Age-related changes
patient experiencing decreased mobility, decreased sensory perception, fecal or urinary incontinence, and/or poor nutrition is
risk for pressure injury development.
- Older adults, those who have experienced trauma
- Those with spinal-cord injuries (SCI)
- Those who have sustained a fractured hip
- Those in long-term homes or community care, the acutely ill, or those in a hospice setting
- Individuals with diabetes
- Patients in critical care settings
people at risk for pressure injuries
Prolonged, intense pressure affects cellular metabolism by decreasing or obliterating blood flow, resulting in tissue ischemia and ultimately tissue death.
affects cellular metablolism
is the major element in the cause of pressure injuries.
Pressure
Current theory suggests that skin and soft tissue damage can begin at the surface and progress inward or begin at the muscle and progress outward, depending on causation
skin theory
Top-down damage (superficial) is thought to be caused by superficial shear or friction, presenting as red skin
(stage 1 pressure injury)
damage is believed to be caused by several pressure-related factors: (1) pressure intensity, (2) pressure duration, and (3) tissue tolerance.
Bottom-up (deep)
as the minimal amount of pressure required to collapse a capillary (e.g., when the pressure exceeds the normal capillary pressure range of 15 to 32 mm Hg)
capillary closing pressure (pressure intensity)
when the pressure applied over a capillary exceeds the normal capillary pressure and the vessel is occluded for a prolonged period of time,
tissue ischemia can occur
if the pressure is relieved and the blood flow returns, the
skin turns red
clinical presentation of obstructed blood flow occurs when evaluating areas of pressure. After a period of tissue ischemia, if the pressure is relieved and the blood flow returns, the skin turns red. The effect of this redness is vasodilation (blood vessel expansion), called
hyperemia (redness)
erythema returns when you remove your finger, the hyperemia is transient and is an attempt to overcome the ischemic episode, thus called
blanchable hyperemia (no longterm damage)
the erythematous area does not blanch (nonblanchable erythema) when you apply pressure, deep tissue damage is probable.
nonblanchable erythema
occurs when the normal red tones of the light-skinned patient are absent
Blanching
When checking for pressure injuries in patients with darkly pigmented skin, dark skin may not show the blanch response. Inspect suspected pressure-related skin alterations with an adjacent or opposite area of the body for comparison
check blanching w/ dark pigmented skin
assessment of changes in skin tissue, consistency (firm vs. boggy [less than normal stiffness or mushy] when palpated), sensation (pain), edema, and warmer or cooler temperature
Skin inspection should include
do not confuse the normal hyperpigmentation of Mongolian spots that are seen on the sacrum of African, Native American, and Asian patients with cyanosis
Mongolian spots in AA
Assess for changes in sensation, temperature, or tissue consistency, which may precede visual skin changes
-examine w/ least pigmentation ex: under arms
skin assessment in dark pigmented skin (do NoT rely only on visual inspection)
localized area of skin may be purple/blue or violet instead of red. Purple or maroon discoloration may indicate deep tissue injury.
deep tissue damage
may occur with induration of more than 15 mm in diameter, and skin may appear taut and shiny
Edema
pressure duration include evaluating the amount of pressure
(checking skin for nonblanching hyperemia)
determining the amount of time that a patient tolerates pressure
(checking to be sure after relieving pressure that the affected area blanches).
extrinsic factors of shear, friction, and moisture affect the ability of the skin to
tolerate pressure
Systemic factors such as poor nutrition, aging, hydration status, and low blood pressure affect the tolerance of the tissue to externally applied pressure.
systemic factors affecting tolerance of tissue
Patients who are comatose, confused or disoriented; those who have expressive aphasia or the inability to verbalize; and those with changing levels of consciousness are
unable to protect themselves from pressure injury
causes occurs at the deeper fascial level of the tissues over the bony prominence
damage that shear cause
death of cells or tissue thru disease or injury
necrosis
effects dermal area
shear
effects epidermis area
-sheet burn- denuded skin (upper part) appears red & painful
friction
occurs in patients who are restless, in those who have uncontrollable movements such as spastic conditions,
friction
is defined as inflammation and erosion to the skin caused by prolonged exposure to various sources of moisture, including wound drainage, urine or stool, perspiration, wound exudate, mucus or saliva (
moisture-associated skin damage (MASD)
classifies pressure injuries
staging system
dead tissue separating from living tissue
slough
dead tissue that falls off
eschar
commonly result from adverse microclimate and shear in the skin over the pelvis and shear in the heel
-Partial-thickness skin loss with exposed dermis
Stage 2 pressure ulcer
If slough or eschar obscures the extent of tissue loss, this is an
Unstageable Pressure Injury.
This injury results from intense and/or prolonged pressure and shear forces at the bone-muscle interface.
Deep-Tissue Pressure Injury
If necrotic tissue, subcutaneous tissue, granulation tissue, fascia, muscle or other underlying structures are visible, this indicates a full-thickness pressure injury
(Unstageable, Stage 3, or Stage 4).
is a disruption of the integrity and function of tissues in the body
wound
tissue layers involved and their capacity 1241for regeneration determine the mechanism for repair for any wound
repair of wound
are shallow in depth, moist, and painful, and the wound base generally appears red.
Partial-thickness wounds
extends into the subcutaneous layer, can be painful, and the depth and tissue type varies, depending on body location
full-thickness wound
partial-thickness wound heals by
regeneration
by forming new tissue, a process that can take longer than the healing of a partial-thickness wound
full-thickness wound heals
clean surgical incision is an example of a
wound with little tissue loss
surgical incision
heals by primary intention
contrast, a wound involving loss of tissue such as a burn, stage II pressure injury, or severe laceration
heals by secondary intention
wound healed by regenerating ex: partial-thickness
epidermal
ex: scrape or abrasion
partial thickness
full thickness
stage 3&4
wound: inflammatory response, epithelial proliferation (reproduction) and migration, and reestablishment of the epidermal layers.
3 components are involved in the healing process of a partial-thickness
causes the inflammatory response, which in turn causes redness and swelling to the area with a moderate amount of serous exudate
Tissue trauma
wound that is kept moist can resurface in 4 days, whereas one left open to air can resurface within 6 to 7 days
wound moist (partial thickness)
4 phases occur in full-thickness wound repair are
hemostasis, inflammatory, proliferative, and maturation.
primary-acting white blood cell is the neutrophil, which begins to ingest bacteria and small debris.
inflammation to heal (neutrophil,)
filling of a wound with granulation tissue, wound contraction, and wound 1242resurfacing by epithelialization
proliferative phase (full thickness healing)
usually results from systemic factors such as age, anemia, hypoproteinemia, and zinc deficiency.
Impairment of healing during proliferative phase
by looking for distention or swelling of the affected body part, a change in the type and amount of drainage from a surgical drain, or signs of hypovolemic shock
detect internal hemorrhaging
is a localized collection of blood underneath the tissues.
hematoma
appears as swelling, change in color, sensation, or warmth that often takes on a bluish discoloration
hematoma