Overview and Assessment Flashcards
Three layers of human skin
epidermis, dermis, subcutaneous tissues
Dermis is ___ layers of ____________ tissue
2 layers; vascular
The epidermis is (avascular, vascular)
avascular
Adipose and fascia are in which layer of skin?
subcutaneous
Which skin layer is for protection?
subcutaneous
Epidermis has how many layers?
5
What is the “horny” layer of the epidermis?
stratum corneum
Which layer of the epidermis is the physical barrier from trauma and infection?
stratum corneum
The outermost layer of the epidermis
stratum corneum
Skin layer beneath the stratum corneum
stratum lucidum
How did the stratum lucidum get its name?
looks clear under a microscope
Skin layer beneath the stratum lucidum
stratum granulosum
Skin layer beneath the stratum granulosum
stratum spinosum
Skin layer beneath the stratum spinosum
stratum basal
Stratum spinosum consists of several rows of _______________ that appear __________ under a light microscope
mature keratinocytes; spiny
Skin layer beneath the stratum basal
basement membrane
Keratin is produced by what layer of epidermis?
stratum basal
As the basal membrane begins breaking down, what happens?
skin becomes more susceptible to wounds (blisters, friction)
Since the epidermis is avascular, how does it receive blood supply?
from the dermis through the basement membrane via diffusion
Melanocytes produce ___________ protecting from _______________.
melanin; UV rays
What do the melanocytes do?
produce melanin protecting from UV rays
Merkel cells are ___________ for _____________.
mechanoreceptors; light touch
Langerhans cells present in ______________ that help _________________ by _______________________________.
deeper layers; fight infection; attacking and engulfing foreign materials
What do hair follicles help with?
temperature regulation
Each hair follicle contains ______________ secreting ____________ to ____________________________.
sebaceous gland; sebum; lubricate the skin and hair
Hair follicles are what kind of keratin?
soft
Nails are what kind of keratin?
hard
Epidermis provides what kind of protection? (functional vs. non-functional)
functional
Sudiferous glands are
sweat glands
Where are sudiferous glands located?
everywhere but lips and ears
Epidermal functions
- barrier to injury, contaminants and light
- prevents dehydration / retains fluid
- produces melanin / coloration
- light touch sensation
- assists with excretion
- temperature regulation
Dermal functions
- Houses epidermal appendages
- Assists with infection control
- Hair production
- Assists with infection control
- Houses sensory receptors
- Supplies nutrients and oxygen to epidermis
- Vitamin D production in response to sunlight
- Supplies sebum to lubricate
Structural changes with aging
- flattening of dermal-epidermal junction pegs
- epidermal thinning
- loss of elastin fibers
- dermal atrophy
- diminished vascularization
Stratum corneum is how much thickness of the epidermis?
3/4 - it is the thickest layer!
Subcutaneous tissue functions
- insulation
- support
- padding
- energy storage for other layers of the skin
Functional changes with aging
- Increased skin permeability
- Decreased inflammatory response
- Decreased elasticity
- Decreased sweat and sebum production
- Decreased synthesis
- Impaired sensory perception
Why do you get poor blood supply with aging?
nutrition, weight, gravity
The very first thing (phase) that happens when a wound is opened
inflammatory phase
How long does the inflammatory phase last?
3-7 days
What is the goal of the inflammatory phase?
to provide hemostasis and clear away bacteria, foreign material and dead tissues
Inflammatory phase - hemostasis
platelet function
Inflammatory phase - vasodilation
meet metabolic demands
Inflammatory phase - mast cells
histamine response
Inflammatory phase - neutrophils
phagocytic, fight bacteria and enhance antibiotic function
Inflammatory phase - macrophages
phagocytic, stimulates fibroblast activity for proliferative phase
Why do the macrophages have to show up?
to call in the next phase
Inflammation - vascular response
- injury
- transudate leaks into interstitial spaces
- vasoconstriction
- platelets aggregate at injury site
- activated platelets release chemical mediators
- vasodilation (within 30 min of vasoconstriction)
What causes exudate in the vascular response of inflammation?
vasodilation
What do macrophages call in?
fibroblasts
Define margination
slower moving PMNs are pushed to sides of vessel walls
Define diapedesis
PMNs adhere to endothelium forcing their way into interstitial spaces by extending footlike projections (pseudopods) through narrow openings with vessel walls
Define chemotaxis
PMNs migrate toward zone of injury guided by chemical gradient formed by bacterial toxins, dead or dying cells and changes in local pH
PMNs stands for
Polymorphonuclear Neutrophils
PMNs secrete
- chemotactic agents and mediators of inflammation
- enzymes to break down damaged tissues and kill bacteria
PMNs secrete chemotactic agents and mediators of inflammation in order to
- attract more PMNs
- stimulate fibroblast migration
- induce vascular growth
When do the monocytes come in?
after the PMNs
Once in the interstitium, monocytes are called
macrophages
How do monocytes direct the repair process?
- Signal extent of injury
- Attract more inflammatory cells
- Produce growth factors
Monocytes secrete
- nitrous oxide
- bactericidal enzymes
Mast cells produce
chemical mediators that attract and activate inflammatory cells
When should we use hydrogen peroxide?
only during the inflammatory phase
cytokines mediate multiple process including
- cell growth
- migration
- activation
- demolition
cytokines are
growth factors
What does fibrinolysin do?
dissolves clots and plugs
After how many days should you start to see less “red hot and swollen”
3-7 days
What does hemosiderin indicate?
poor circulation from the veins ???
What are the “stars” of the proliferative phase?
fibroblasts
What phase is stimulated by the inflammatory phase?
proliferative/granulation phase
The proliferative/granulation phase is stimulated by
the inflammatory phase
True/False: The proliferative/granulation phase overlaps with the inflammatory phase.
True
Fibroplasia
fibroblast synthesis for granulation tissue
Endothelial budding
vessels from surrounding tissue migrate to supply nutrients
Myofibroblasts
wound contraction at margins
Collagen matrix consists of
- collagen
- hyaluronic acid
- fibronectin and elastin formation
Angioblasts
endothelial cells that make up blood vessel walls adjacent to zone of injury
Angioblasts bud and grow into affected area directed by
- local tissue ischemia
- vascular endothelial growth factor
- chemical mediators
MMPs stands for
Matrix Metalloproteases (MMPs)
What produces MMPs?
- neutrophils
- macrophages
- fibroblasts
- keratinocytes
What do MMPs do?
degrade debris formed during inflammatory phase leaving a defect
What kind of tissue is granulation tissue?
vascularized connective tisue
ECM stands for
Extracellular Matrix
Surface cell receptors called _______________ help cells _______________ and ______________ to the ____________.
integrins; recognize; reversibly bind; ECM
Myofibroblasts
actin-rich fibroblasts with contractile proteins to pull on ECM and draw wound edges closer together
Drawing wound edges closer together is called
contraction
What is wound contraction? What is responsible for this?
Drawing wound edges closer together; myofibroblasts
What guides the epithelial cells at the wound margins to migrate to the center of the wound?
chemotactic agents
If granulation tissue is not “bumpy”, pt is deficient in
protein
In the epithelialization/maturation phase, what migrates?
epithelial cells
In the epithelialization/maturation phase, there is a balance between
collagen lysis and collagen synthesis
There is a balance between collagen lysis and collagen synthesis in what phase?
epithelialization/maturation phase
In the epithelialization/maturation phase, collagen aligns how?
to applied stress
Since collagen aligns to applied stress in the epithelialization/maturation phase, what is important to do?
ROM and positioning
Scar formation and remodeling occurs in what phase?
epithelialization/maturation phase
How long does the epithelialization/maturation phase last?
6 months to 2 years
Tensile strength of wound will not exceed
70-80% of the original skin
Inadequate stimulus for repair results in
gradual loss of tissue, leading to inadequate response
Reasons for impaired inflammation
- Inadequate stimulus for repair
- Inadequate perfusion / ischemia
At what phase of the inflammatory process should ROM and positioning begin?
day 1 of inflammatory
Reasons for impaired proliferation/granulation
- Increased amounts of inflammatory cytokines
- Low levels of growth factor cytokines
- Inadequate substrate availability (protein, vitamins, minerals)
- Inadequate oxygenation
- Disruption of pH and temperature
Intrinsic factors affecting healing
- Age
- Chronic disease
- Immunosuppression
- Sensory impairment
- Presence of foreign body
- Tissue perfusion
- Malnutrition
Extrinsic factors affecting healing
- Smoking
- Medications
- Nutrition
- Chemotherapy / Radiation Rx
- Stress
- Trauma
- Infection or microbial overload
In normal wound healing, full-thickness loss heals how?
by scar tissue formation
- inflammation
- granulation / proliferation
- epithelialization
- maturation / remodeling
Reasons for impaired remodeling/maturation
- imbalance of lysis / synthesis activity
What types of ulcers are staged? graded?
pressure; diabetic
What is undermining?
Where the wound edge is detached and Q-tip can be slipped in and wiggled around.
Iatrogenic factors affecting healing
- local ischemia
- treatment choices
- trauma
Wound measurements are universally recorded in what order?
Length x width x depth
Wounds are universally measured in what scale?
centimeters
Clock vs Perpendicular method of measuring wound size.
Clock is more objective and consistent
What is tunneling?
When two wounds “communicate”
What is a fistula?
A tunnel with no “exit” - may go straight to an organ or bone
Scab vs. eschar
A scab is just dried blood, eschar is dead tissue
Types of drainage
- serous
- serosanguinous
- sanguinous
- purulent
Sanguinous drainage is
bloody
Serous drainage is
- clear
- thin
- watery
Serosanguinous drainage is
clear with a bloody tint
Wound closure - primary intention
edges of incision are physically approximated and held in place
Wound closure - secondary intention
- granulation tissue matrix must be built and wound contraction achieved
- unable to approximate wound edges
Wound closure - delayed primary intention (tertiary intention)
- combination of primary and secondary intentions
- contaminated wounds
Short term goals in wound healing
- Promote moist clean wound environment
- Reduce / localize erythema - measure
- Reduce / control edema with elevation or compression - measure
- Shift drainage from purulent to serous
- Reduce drainage from copious to mod/min
- Pain control with dressing or positioning choices
- Improve periwound integrity to promote wound contraction
- Soften necrosis to prepare for debridement
- Reduce risk factors for infection
- Control drainage with dressing choices to protect periwound
- Education
Long term goals in wound healing
- Reduce necrosis by percentage
- Promote granulation by %
- Reduce size of undermining, tract, or tunnel
- Reduce wound size by cm
- Tissue perfusion and oxygenation are enhanced
- Wound and soft tissue healing is enhanced
- Complications are reduced
Examples of linear wounds
paper cut, surgical incision, small cutaneous wounds
Signs of infection
- Induration
- Fever
- Erythema
- Edema
- Odor
- Purulence
- Increased pain
- Friable tissue
- Change in color
What is induration?
hardness
What is friable tissue?
wipes away, has too much bacteria
What does a change in color of a wound indicate?
too much bacteria
Long term goals in healing diabetic wounds
- Loading on a body part is decreased
- Protection of a body part is increased
- Tolerance to activities is increased
- Weight bearing status is improved
- Awareness and use of community resources is improved
Long term goals in healing wounds caused by vacular insufficiency
- Pain decreased
- Protection of a body part is increased
- Sense of well-being is increased
- Soft tissue swelling, inflammation, or restriction is reduced
- Tolerance to positions and activities is increased
Purulent drainage is
- cloudy
- white
What happens in epiboly?
Edges of wound have rolled under and healing has plateaued
What is it called when the edges of a wound have rolled under and healing has plateaued?
epiboly
Maceration results in
- moist wound edges
- white
- fragile
- peeling
The epidermis contains what types of cells?
melanocytes, melanin, Langerhans’ cells
The dermis contains what types of cells?
fibroblasts, macrophages, WBCs, mast cells
What are the fat tissues of the subcutaneous layer for?
energy
In which skin layer are hair follicles, sebaceous, and sweat glands located?
dermis
A localized build up of cells in the stratum corneum due to pressure or friction is called
callus
In what layer of skin does a callus occur?
stratum corneum
2 Layers of the dermis
- papillary
- reticular
The papillary dermis is the ground substance that
conforms to the contours of the stratum basal
What is the purpose of a callus?
protection from trauma
What is a callus?
a localized build up of cells in the stratum corneum due to pressure or friction
Layers of the epidermis from superficial to deep
- Stratum corneum
- Stratum lucidum
- Stratum granulosum
- Stratum spinosum
- Stratum basal
What is the “last layer” of the epidermis to contain living keratin cells?
stratum granulosum
The basement membrane is the “scaffolding” between what 2 skin layers?
epidermis and dermis
The papillary dermis helps the _______________ to _____________ the dermis and _________________.
basement membrane; anchor; protect epidermal appendages
Blisters occur at which area layer of skin? Why?
papillary dermis; due to friction between layers
What does the reticular layer of the dermis provide?
structural support
Fascia and muscles beneath the subcutaneous tissue provide
further structure and padding
Regarding the vascular response of inflammation, what happens when transudate leaks from vessels into interstitial spaces?
localized edema
Regarding the vascular response of inflammation, what is vasoconstriction mediated by?
serotonin, norepinephrine, ANS
Regarding the vascular response of inflammation, what activates the platelets to aggregate at the injury site?
damaged endothelial cells and exposed collagen
cytokines
signaling proteins
What do growth factors control?
cell growth, differentiation, and metabolism
What do chemotactic agents do?
attract cells necessary for repair
Regarding the vascular response of inflammation, what triggers vasodilation?
- histamine
- plasma-active substances
- platelet-derived vasoactive substances
Regarding the vascular response of inflammation, histamine released by mast cells increases
vessel wall permeability for short term vasodilation
Regarding the vascular response of inflammation, why are prostaglandins released?
for long term vasodilation
In the cellular response of inflammation, increased vessel wall permeability causes
decrease in blood volume
Macrophages stimulate what phase?
proliferative
Enzymes that accelerate the demise of damaged cells are called
mast cells
Regarding the cellular response of inflammation, what adheres to vessel walls and moves into the interstitial spaces?
leukocytes, erythrocytes, and platelets
Neutrophils and macrophages phagocytize microorganisms, then excrete
- ascorbic acid
- lactic acid
- hydrogen peroxide
What is the goal of the proliferative/granulation phase?
to replace lost dermal tissue with scar tissue
What occurs during the proliferative phase?
- Fibroplasia
- Endothelial budding
- Collagen matrix of collagen, hyaluronic acid, fibronectin and elastin formation
- Myofibroblasts
- Angiogenesis
- Granulation tissue formation
Fibroblasts secrete __________________ and lay down the ____________________.
hyaluronic acid and fibronectin; ECM
Fibroblasts are guided by
- chemotactic agents
- low oxygen tension
What does the ECM “technically” do?
mediates wound contraction
What provides a scaffolding for contact guidance to move cells into the wound area?
ECM
Inadequate perfusion / ischemia leads to
vascular insufficiency leading to muted hemostasis and a muted cascade initiation
In normal wound healing, partial thickness / superficial loss heals by
re-epithelialization / regeneration
In normal wound healing of full-thickness loss, how will the wound edges be?
soft and gradually adhering
When assessing skin, what can hair pattern tell you?
where blood is flowing to
ABI stands for
Ankle-Brachial Index
ABI =
ankle systolic pressure / brachial systolic pressure
ABI values
1 = normal
.8-.9 = intermittent claudication
.5-.8 = significant occlusion (compression contraindicated)
>1 - non-compressible arteries, calcification
The ABI is invalid for what types of pts?
diabetics
What ABI values contraindicate compression
1
Wounds besides pressure and diabetic ulcers are “graded” how?
- superficial thickness
- partial thickness
- full thickness
superficial thickness
epidermis removed
partial thickness
epidermis and part of dermis removed
full thickness
epidermis and dermis removed to/through subcutaneous tissue or deeper
What must be done in the case of epiboly?
- must promote inflammatory phase by releasing edges
- debridement or silver nitrate
Options for correction of maceration
- choose more absorptive dressing
- increase frequency of dressing change
- utilize skin barriers / skin prep
Long term goals in healing pressure ulcers
- Loading on a body part is decreased
- Protection of a body part is improved
- Sense of well-being is improved
- Tolerance to positions and activities is increased
Long term goals in wound healing in all patients
Look it up I’m sick of typing these long-winded goals that are all the same and mostly common sense - p. 16 slide 3