NCLEX Review Guide: Scabies in Pediatric Patients

Causative Agent and Transmission

• Scabies is caused by the microscopic mite Sarcoptes scabiei var. hominis, which burrows into the upper layers of the epidermis, creating tunnels where females lay eggs. The infestation is highly contagious and spreads through prolonged skin-to-skin contact with an infected person, making it common in households, childcare settings, and schools.
• The incubation period ranges from 2-6 weeks in people with no previous exposure, but symptoms may appear within 1-4 days in previously sensitized individuals. During this time, an infected person can transmit scabies even without showing symptoms.

Clinical Manifestations

• The hallmark symptom is intense pruritus (itching) that typically worsens at night. The itching results from a delayed hypersensitivity reaction to the mites, their eggs, and their waste products.
• Characteristic skin lesions include burrows (threadlike, grayish, or skin-colored raised lines), papules, vesicles, pustules, and excoriations primarily in the web spaces between fingers, flexor surfaces of the wrists, axillae, belt line, and genital areas. In infants and young children, the distribution often includes the head, neck, palms, and soles.

Diagnostic Methods

• Diagnosis is primarily clinical, based on the characteristic distribution of lesions and history of pruritus. Definitive diagnosis involves microscopic identification of the mite, eggs, or fecal pellets from skin scrapings.
• Burrow ink test: A diagnostic technique where ink is applied to suspected areas and then wiped off; the ink penetrates the burrows making them more visible as dark lines.

Nursing Assessment

1. Perform a comprehensive skin assessment, paying particular attention to web spaces between fingers, wrists, axillae, belt line, and genital areas.
2. In infants and young children, examine the head, neck, palms, and soles thoroughly.
3. Document the pattern and characteristics of lesions, including burrows, papules, vesicles, and excoriations.
4. Assess for secondary bacterial infections due to scratching (impetigo, cellulitis).
5. Obtain a thorough history of symptom onset, exposure to infected individuals, and presence of similar symptoms in family members or close contacts.

Pharmacological Management

• Permethrin 5% cream is the first-line treatment for children over 2 months of age. It should be applied to the entire body from the neck down (including under nails), left on for 8-14 hours, then washed off. A second application is recommended 7-10 days later.
• For infants under 2 months, sulfur ointment 6-10% may be used. For older children and adolescents with severe or resistant cases, oral ivermectin may be prescribed as an alternative treatment.
• Antihistamines and topical steroids may be prescribed to manage pruritus, which can persist for 2-4 weeks after effective treatment due to continued hypersensitivity reactions.

Environmental Management

• All household members and close contacts should be treated simultaneously, even if asymptomatic, to prevent reinfestation. The mite cannot survive more than 2-3 days away from human skin.
• Clothing, bedding, and towels used within 3 days before treatment should be washed in hot water and dried on high heat or dry-cleaned. Items that cannot be washed should be sealed in plastic bags for at least 72 hours.

Patient and Family Education

• Instruct caregivers on proper application of scabicides, emphasizing complete coverage from neck to toes (including under nails) and the importance of leaving the medication on for the full recommended time.
• Educate families about the continued presence of pruritus for 2-4 weeks after treatment and provide strategies for symptom management.
• Explain the importance of treating all household contacts simultaneously to prevent reinfestation and the need for environmental cleaning.

Special Considerations for Pediatric Patients

• Infants and young children may require treatment of the head, neck, face, and scalp, as these areas are commonly affected in this age group but not typically in adults.
• Crusted (Norwegian) scabies is a severe form that can occur in immunocompromised children and is highly contagious due to the high mite burden. These patients may require multiple treatments and oral ivermectin.

Scabies vs. Other Skin Conditions

Common Treatment Misconceptions

• Misconception: One application of scabicide is sufficient. Reality: A second application is recommended 7-10 days after the first to kill newly hatched mites from eggs that survived the initial treatment.
• Misconception: Only symptomatic family members need treatment. Reality: All household members and close contacts should be treated simultaneously, regardless of symptoms, due to the long incubation period.
• Misconception: Continued itching means treatment failure. Reality: Pruritus often persists for 2-4 weeks after successful treatment due to hypersensitivity reactions to dead mites.

Key Concepts to Master

• Understand the pathophysiology of scabies, including the mite's life cycle and how this impacts treatment protocols.
• Know the characteristic distribution pattern of lesions in children versus adults, and the classic symptoms that distinguish scabies from other skin conditions.
• Memorize first-line treatments for different age groups and the complete management approach, including environmental interventions.

NCLEX Question Strategies

• For questions about scabies treatment, remember that permethrin is first-line for children over 2 months, while sulfur ointment is used for younger infants.
• When answering questions about patient education, prioritize information about complete treatment of all household contacts and proper application technique.
• For assessment questions, focus on the characteristic distribution of lesions and the pattern of pruritus (worse at night).

Essential Concepts

• Scabies is caused by the Sarcoptes scabiei mite and is highly contagious, spreading through prolonged skin-to-skin contact.
• Characteristic symptoms include intense pruritus (worse at night) and typical lesions (burrows, papules, vesicles) in characteristic distribution patterns.
• Distribution in children may include the head, neck, face, palms, and soles, which differs from adults.
• Permethrin 5% cream is the first-line treatment for children over 2 months; sulfur ointment is used for younger infants.
• All household members and close contacts must be treated simultaneously, and environmental cleaning is essential to prevent reinfestation.
• Pruritus may persist for 2-4 weeks after successful treatment due to hypersensitivity reactions.

Self-Assessment Checklist

• I can describe the pathophysiology and transmission of scabies
• I can identify the characteristic clinical manifestations of scabies in children
• I understand the differences in presentation between children and adults
• I know the first-line treatments for different age groups
• I can explain the complete management approach, including environmental interventions
• I understand why pruritus persists after successful treatment
• I can differentiate scabies from other common skin conditions in children
• I know the key patient education points for families of children with scabies