Botanical Agents for the Treatment of Nonmelanoma Skin Cancer
Chapter 42 Agents Used in the Treatment of Skin Conditions.
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Transcript of Chapter 42 Agents Used in the Treatment of Skin Conditions.
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Chapter 42
Agents Used in the Treatment of Skin Conditions
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The Skin The largest organ Several functions
• Protective barrier—microbials and trauma
• Senses temperature changes
• Secretes wastes through sweat glands
• Stores fat
• Synthesizes vitamin D
• Provides a site for drug absorption
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Epidermis
Outer layerThickness is variableBasal layer is where new cells
are formedOld cells migrate to surface
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Epidermis
Prickle layer Protein projections connect adjacent
cells Cells become flat and press together Compressed cells become the keratin
layer Keratin layer is the protective barrier
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Dermis
Thicker than the epidermis Provides support and nourishment for
the epidermis Rich supply of blood vessels, nerves,
sweat glands, and hair follicles
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Structures of The Skin
Hair and nail tissueEccrine and apocrine sweat glandsSweat contains water and waste
productsEccrine glands are located
throughout the body
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Skin structures
Apocrine glands are associated with a hair follicle – mainly in axillary and pubic areas
Emotional stimuli causes excretion of electrolyte solution
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Skin Structures
Sebaceous glands – connected to hair follicles
Large numbers on head and faceAt puberty, secretes oily mixture
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Drug Classification of Dermatological Agents
Emollients Keratolytics Local anesthetic agents Local antipruritic agents Antibacterial agents
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Emollients
Dry skin causes discomfort, itching, cracking, and predisposition to skin disorders
Treatment is use of emollients Oily in nature: some skin lotions are
emollients Prevents loss of additional skin
moisture
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Emollients
Forms occlusive barrier Most contain waxes, fats, and/or oils Most effective when applied after
shower or bath Do not use on skin lesions that are
moist or exudative
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Keratolytics
Some disorders cause a thickening of the keratin layer
Skin becomes brittle and easily cracked
Causes itching and discomfortSalicylic acid, lactic acid, and
acetic acid
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Keratolytics
Applied after area has been bathed or soaked
More effective if covered with occlusive dressing
Kept on skin overnight; removed in morning
Repeated applications are effective
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Local Anesthetics and Antipruritic Agents
Inhibits conduction of nerve impulses from sensory nerves
Reduces pain and itching Used topically for insect bites, burns, and plant
allergies
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Local Anesthetics and Antipruritic Agents
Poorly absorbed through intact skin Enhanced through damaged skin Local or systemic adverse effects Allergic reaction (locally or
systemically)
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Local Anesthetics and Antipruritic Agents
Topical anesthetics should only be used when absolutely necessary
Avoid in patients with previous hypersensitivity reactions
Avoid in severely traumatized skin
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Local Anesthetics and Antipruritic Agents ‘caine’ types Ointment, cream, spray, liquid or gel
forms Some antipruritic products contain
antihistamines Can be associated with development of
local irritation and hypersensitivity reactions
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Antibacterial Agents
Prevents infectionTreats superficial infectionsTreat acne vulgarisAssociated with development of
hypersensitivity
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Antibacterial Agents
Topical antibiotic agents are not usually ones that are used systemically
Combination therapy is popularCaution when applying to large
areasSystemic effects may be possible
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Drug Classification of Dermatological Agents
Antiviral agents Antifungal agents Anti-inflammatory agents Antiparasiticidal agents
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Antifungal Agents
Treats two types of fungal infections Dermatophyte organisms Yeastlike organisms
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Dermatophyte Infections
Caused by tinea or others
Most common is ringworm type
Circular pattern
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Dermatophyte infections
Scalp, nails, and/or skinAlways superficialMay be known as ‘athlete’s
foot’ or ‘jock itch’
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Dermatophyte Infections
Can live only on dead keratin tissue
Affected area must be replaced with fungus-free tissue
Agents must be continued long-term
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Dermatophyte Infections
Relapses common
Ointment, cream, aerosol, lotion, and powder forms
If burning or irritation develops, discontinue use
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Dermatophyte Infections
Oral treatment may be effective Deposits in newly formed skin cells When new cells reach keratin layer, they
are resistant to fungus Best absorbed with or after a fatty meal Monitor for hypersensitivity
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Yeastlike Infections
Involves warm, moist areas and mucous membranes
Moisture promotes yeast growth Ventilation of area is important Treatment should be continued for 1
week following lesion disappearance
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Antiviral Agents
Most difficult to treatHerpes simplex 1 and 2Topical agents - cannot
completely eradicate Decreases healing time and
pain
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Antiviral agents
Topical, oral, or parenteral formsTopical form can cause burning,
stinging, itching, or rashCaution in patients with renal
impairmentMonitor for hypersensitivity
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Anti-Inflammatory Agents
Topically applied corticosteroids Alleviates inflammatory symptoms Irritation or allergic disorders Useful in controlling psoriasis Interferes with normal immunological
responses Reduces redness, itching, and edema Slows rate of skin cell production
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Anti-Inflammatory Agents
Effectiveness depends on potency of drug, vehicle used, skin thickness and integrity, and presence of moisture
Damaged skin may increase amount of drug absorbed systemically
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Anti-Inflammatory Agents
Increases systemic side effectsOcclusive dressings increase
absorptionPotent agents must be used with
caution on thin skinDo not use in the presence of
fungal infection
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Antiparasitic Agents Parasites live on outer surfaces Lice and scabies Lice is transmitted person to person Lives on head, body, or pubic area Scabies is a mite; burrows under the skin and lays
eggs Drug of choice is lindane Do not use in children under 2 Can cause seizures if applied to open skin CNS toxicity
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Additional Dermatologic Agents Debriding agents Antineoplastic agents Burn treatment agents Eczema agents Psoriasis agents Topical hair agents Agents for diabetic foot ulcer
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Diabetic Foot Ulcers
Leading cause of amputationsMicrovascular and neurological
changes due to long-term elevated blood sugar levels
Increases migration of cells responsible for wound healing to site of ulcer
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Diabetic Foot Ulcers
Needs adequate blood supply Gel form helpful for protecting healing
wounds Long-term therapy required – Regranex
promotes healing
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Antineoplastic Agents
Destroys cells that grow rapidlyTopical treatment of solar or actinic
keratosisPremalignant skin lesionsDevelops in fair skinned people
exposed to heavy sunlightAlso used to treat basal cell
carcinomas
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Antineoplastic Agents
Use nonmetallic applicatorsProtect skin with rubber glovesWash hands immediatelyAvoid contact with eyes, nose, or
mouthAvoid exposure to sunlight
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Agents Used to Treat Burns
Treatment aimed at preventing infection
Important to prevent toxic absorption into systemic circulation
Blood supply is impairedTopical products may be only way
to prevent infection
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Agents used to treat burns
Occludes site to prevent contamination
Applied to burn after cleaning and debriding
Therapy continued until healing well or ready for grafts
Monitor for hypersensitivity and adverse effects
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Minoxidil
Systemically used as an antihypertensive Topically promotes hair growth Dilates local blood vessels Long-term use Caution with patients with heart disease May cause tachycardia, fluid retention, and/or
weight gain Systemic effects more likely if applied to
broken skin
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Topical Debriding Agents Purpose
• Remove dead skin
• Promote healing
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Topical Debriding Agents
Made of enzymes General action
• Digest dead necrotic tissue Specific action
• Made of enzymes that digest:
•Collagen: collagenase (Santyl)
•Fibrin in a blood clot: fibrinolysin (Elase)
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Debriding Agents
Promotes removal of dead tissue Removal of dead tissue enhances formation of
new tissue Wound healing occurs more quickly Second- and third-degree burns and decubitus
ulcers Enzymes selectively digest dead tissue Specific in action
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Eczema S & S of acute or chronic conditions
• Area appears inflamed
• Skin may be dry and may include wet or weepy drainage
• Definition
• Inflammatory skin condition. Symptoms are pustules, redness, vesicles, crusts, skin thickening, and persistent itching and burning.
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EczemaDrug agent
•Pimecrolimus (Elidel)
•Topical immunomodulator
•Adverse effects
•Site irritation
•Headache
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Agents Used to Treat Eczema
Eczema is a chronic inflammatory disease of the skin Itching and scaling of the skin Piecrolimus - short-term and intermittent long-term use - adverse effects include site irritation and headache Tacrolimus - not a steroid - adverse effect is an increased risk for skin infections
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Psoriasis A chronic skin condition
• Consists of painful reddened papules that form plaques with distinct borders
• Other patches appear as silvery yellow-white scales
• Usually located
•Elbows, scalp, knees, and genitalia
• Amevive (alefacept)
• Raptiva (efalizumab)
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Psoriasis Drug agent
• Alefacept (Amevive)
•Immunosuppressant
•Stops the activity of T lymphocytes
•Given intramuscularly
•Adverse effects
•Infection
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Agents Used to Treat Psoriasis
Psoriasis is an autoimmune chronic skin disorder
Plaques on the skin – itching, bleeding, cracking
Alefacept – promotes longer remissions Efalizumab – stimulates body’s immune
response
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Agents used to treat burns
Topical medications more effective if blood supply to area damaged
Aim to prevent infection without systemic absorption of toxins
• Silvadene
• Sulfamylon
• Furacin
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Topical Application Methods
Depend on the etiology of the skin problem
Require thorough cleansing of the skin before the agent is applied or reapplied
Must be applied appropriately or the agents will not work
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Nursing Considerations
Perform thorough skin assessmentMinimize factors that promote skin
drying in the elderlyInstruct in proper use of topical
medicationsBe aware that occlusive dressings
may increase absorption
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Nursing Considerations
Good hygiene is importantAssess for symptoms of infectionAdminister medications according
to guidelinesTeach diabetic patient the
importance of foot care and daily assessment
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