HA Exam 2 Review Notes
Skin Layers:
Functions:
The skin serves as the body’s largest organ and comprises three main layers:
Epidermis: This outer layer provides a critical barrier that protects against pathogens, water loss, and harsh environmental elements. It is composed mainly of keratinocytes, which produce keratin, a protein that aids in skin structure and protection. The epidermis undergoes continuous regeneration and includes various cells such as melanocytes, which produce melanin providing skin color and protection from UV radiation.
Dermis: Situated beneath the epidermis, the dermis supports skin structure through connective tissues and houses essential components, including blood vessels, nerves, hair follicles, and sebaceous (oil) and sweat glands. The dermis is divided into two regions: the papillary dermis, which contains thin collagen fibers and is responsible for fingerprints, and the reticular dermis, which includes dense collagen and elastin fibers providing strength and elasticity.
Hypodermis (Subcutaneous Layer): This innermost layer consists of loose connective tissue and fat cells, insulating the body and absorbing shock to protect underlying organs and muscles. It also aids in energy storage and provides a passage for larger blood vessels and nerves from the dermis to the skin.
Skin Color:
Determinants:
Skin color is influenced by several factors, primarily the amount and type of melanin produced, as well as carotene pigmentation and blood flow in the dermis due to hemoglobin.
Abnormal findings: Changes in skin color, such as jaundice (yellowing of the skin due to liver dysfunction) or cyanosis (bluish tint from lack of oxygen), can indicate underlying conditions requiring clinical assessment.
Assessment in dark-skinned patients: In individuals with darker pigmentation, assessment should focus on areas with less melanin, such as the palms, soles, and mucous membranes for accurate evaluations of skin health.
Skin Changes in Older Adults:
Common changes include:
Thinning skin: As collagen and elastin decrease, skin loses its firmness and resilience.
Increased dryness: Reduced sebaceous gland activity leads to less oil production, causing dryness and increased chance of irritation.
Age spots: These are patches of pigmentation that result from long-term sun exposure and the aging process.
Decreased elasticity: The skin becomes less elastic, leading to sagging and the development of wrinkles.
Skin Changes in Pregnancy:
Pregnancy can induce several skin changes, including:
Stretch marks (striae): These can arise due to rapid weight gain and hormonal changes, often appearing as indented streaks on the abdomen, breasts, or thighs.
Linea nigra: This is a dark vertical line that may appear on the abdomen during pregnancy due to hormonal influences.
Chloasma (melasma): Often referred to as the "mask of pregnancy," this condition manifests as dark patches on the face due to hormonal changes and sun exposure.
Skin Risks:
Increased risk factors for skin breakdown:
Identifiable factors include immobility, moisture exposure, nutritional deficiencies, and incontinence.
Prevention strategies: Regular repositioning, effective moisture management (e.g., use of barrier creams), and maintaining proper nutrition can help mitigate these risks.
Wound healing aids: Key factors in optimal wound healing include adequate blood circulation to the area, maintaining a moisture balance without maceration, and rigorous infection control protocols.
Pressure Injuries (Stages 1-4):
Definition:
Localized damage to the skin and/or underlying tissue due to prolonged pressure, often occurring over bony prominences.
Increased risk factors: Factors contributing to pressure injuries include prolonged pressure, shear forces, friction, and excessive moisture from incontinence or sweating.
Assessment sites: Common locations for assessment include the sacrum, heels, elbows, and other bony prominences, with special attention to individuals at risk.
Skin Cancer Types:
Types:
Skin cancers fall primarily into three categories:
Basal Cell Carcinoma: The most common type, often appearing as a pearly or waxy bump, usually on sun-exposed areas.
Squamous Cell Carcinoma: Often manifests as a firm, red nodule or flat lesion with a scaly, crusted surface.
Melanoma: A more aggressive form, characterized by asymmetry, irregular borders, color variation, or larger diameter, necessitating immediate medical evaluation.
Risk factors:
These include a personal or family history of skin cancer, prolonged exposure to sunlight, and having fair skin or a high number of moles.
Skin Disorders:
Common disorders include:
Lyme Disease: Characterized by a distinctive bull's-eye rash and flu-like symptoms, often resulting from tick bites.
Tinea Pedis: Commonly known as athlete's foot; it presents as scaling, redness, and unbearable itch.
Psoriasis: An autoimmune condition leading to red patches covered by silvery scales, which can vary in severity.
Pediculosis Capitis: Infestation of the scalp by head lice, resulting in intense itching and often visible lice or nits in the hair.
Lesions:
Types include:
Common types of skin lesions include macule, papule, patch, plaque, vesicle, and pustule, all of which differ in their presentation and significance.
Description examples: Macules are flat and discolored, while papules are raised and solid. Understanding these differences is crucial for effective diagnosis and documentation.
Lesion Documentation:
Terms used in documentation include:
Grouped: Clumped together.
Annular: Ring-shaped lesions, often seen in conditions like tinea corporis.
Confluent: Merged lesions, which can indicate ongoing inflammatory processes.
Discrete: Isolated lesions, which may suggest localized issues.
Skin ABCDE:
Assessment Criteria:
For identifying potential melanomas, the ABCDE criteria are essential:
A: Asymmetry: One half does not match the other.
B: Border irregularity: Edges are uneven or scalloped.
C: Color variation: Multiple colors present within a lesion.
D: Diameter >6mm: Lesions larger than a pencil eraser warrant further evaluation.
E: Evolving: Changes in size, shape, or color should be closely monitored.
Skin Turgor:
Testing:
Skin turgor is assessed by pinching the skin on the forearm and observing how quickly it returns to its original position.
Normal findings: Skin should quickly return to place; delayed return may indicate dehydration or loss of skin elasticity.
Peripheral Neuropathy:
Commonly seen in individuals with diabetes; symptoms include numbness, tingling, and burning sensations.
Risk for skin breakdown: Due to sensory loss, individuals may inadvertently sustain injuries without realizing, necessitating education on proper foot care and the importance of regular check-ups.
Excoriation:
Definition:
Refers to skin irritation or abrasions frequently caused by scratching due to underlying conditions such as eczema or infestations.
Assessment locations: Commonly found in areas subject to friction, including elbows, knees, and areas where clothing may rub against the skin.
Eye Disorders:
Common conditions:
Macular Degeneration: Leading to progressive loss of central vision, primarily affecting older adults.
Glaucoma: Increased intraocular pressure can result in peripheral vision loss; regular screenings are critical for early detection.
Diabetic Retinopathy: Retinal damage resulting from diabetes; requires ongoing monitoring to prevent severe vision loss.
Cataracts: Characterized by clouding of the lens, leading to blurred vision and necessitating surgical intervention in advanced cases.
Eye Terminology:
Definitions include terms relevant to eye assessments:
Ptosis: Drooping eyelid potentially signaling neurological compromise.
Strabismus: Misalignment of the eyes necessitating intervention, often in childhood.
Exotropia: Eye turns outward;
Esotropia: Eye turns inward.
Exophthalmos: Protrusion of the eyeballs often seen in thyroid-related conditions.
Enophthalmos: Sinking of the eyeballs which may indicate health issues such as dehydration or aging.
Hearing Loss:
Risk factors:
Age-related changes, exposure to loud noises, and certain ototoxic medications can lead to hearing deficits.
Types of hearing loss:
Conductive: Due to problems in the outer or middle ear; often treatable.
Sensorineural: Results from inner ear damage; usually irreversible.
Mixed: A combination of conductive and sensorineural loss.
Ear Assessment Tests:
Rinne Test: This compares air and bone conduction, where a normal result shows air conduction (AC) greater than bone conduction (BC).
Weber Test: Assesses lateralization; in a healthy individual, sound should be equally heard in both ears.
Whisper Test: Evaluates hearing ability; a normal response would be repeating the whispered words accurately.
Inner Ear Examination:
Differences in assessing inner ear function between children and adults may arise due to the positioning of the ear canal and the development stage of the patient.
Mouth Assessment:
Conditions:
Candidiasis: Presence of white patches in the mouth indicative of thrush, commonly linked with immunosuppression.
Black Furry Tongue: A condition characterized by altered papillae, leading to discoloration.
Swollen Tonsils: Indicating potential infection, with signs of redness and swelling warranting further evaluation.
Hormonal Disorders:
Conditions affecting hormonal balance can have profound effects on physical health:
Hypothyroidism: Characterized by an underactive thyroid leading to fatigue, weight gain, and sensitivity to cold.
Hyperthyroidism (Grave's Disease): This condition involves an overactive thyroid, often causing anxiety, weight loss, and heat intolerance.
Cushing's Syndrome: Excess cortisol production may lead to specific signs, including moon facies, truncal obesity, and skin changes.
Safety for Visual Impairment at Home:
Strategies to improve safety include ensuring clear pathways, adequate lighting in all areas, and labeling important objects to assist visually impaired individuals.
Lymph Nodes Assessment:
Location:
Assessment should include lymph nodes in the neck, axilla, and groin regions.
Normal findings: Nodes should be small and non-tender.
Abnormal findings: Enlarged or tender nodes could indicate infectious processes or malignancy, necessitating further investigation.
Trachea Assessment:
The normal position of the trachea is midline.
Abnormal findings: Deviation can indicate pathology: to the affected side might suggest masses or tension pneumothorax, while deviation to the unaffected side may be seen in conditions like atelectasis.
Head Assessment in Infants:
Assessment should monitor for abnormal findings like increased head circumference, the presence of soft spots (fontanelles), or unusual head shape, which might indicate conditions such as hydrocephalus or craniosynostosis.