409 Ch.37

Pediatric Musculoskeletal and Bacterial Joint Assessment

• Clinical Presentation of Joint Pathology:

  • Medical-Surgical clinical knowledge remains directly applicable to pediatric patients, provided the age of the population is carefully considered.

  • Pathology in the joints typically manifests as decreased or absent range of motion (ROM) in affected joints.

  • Clinical findings are predominantly unilateral rather than bilateral.

  • Upon physical examination, the affected joint site presents as warm and tender.

  • Patients naturally adopt a position of comfort to alleviate discomfort, which commonly involves maintaining a flexed position.

  • Example: A child keeping the hip joint flexed does so because extending or straightening the leg aggravates and worsens the pain.

• Diagnostic and Therapeutic Management:

  • Identification of the specific causative bacteria via testing and cultures is essential to guide appropriate treatment.

  • Management of bacterial bone and joint infections requires the administration of intravenous (IV) antibiotics.

Overview of Viral Exanthems and Pediatric Immunity

• Pathophysiological & Behavioral Susceptibility:

  • Viruses possess the ability to replicate very rapidly.

  • Younger pediatric patients have an immature immune system, rendering them highly susceptible to viral pathogens.

  • High rates of viral transmission in pediatric populations are driven by behavioral factors, including inadequate hand washing, frequent touching of the nose, and sharing toys.

• Viral Exanthems Presentation:

  • Viral infections in children frequently present with characteristic skin rashes known as viral exanthems, each displaying distinct rash patterns.

  • The vast majority of pediatric viral illnesses do not require hospitalization and can be managed effectively at home using supportive care.

Viral Exanthems: Rubella and Measles

• Rubella (German Measles):

  • Transmission: Transmitted via respiratory secretions and vertical transmission from mother to fetus (congenital rubella, often noted in maternal lab histories).

  • Clinical Presentation:

    • Presents with a characteristic rash that begins on the face and spreads downwards across the body in a cephalocaudal pattern (head-to-toe).

    • The rash is mildly pruritic (itchy).

    • Physical assessment reveals lymphadenopathy, specifically in the axillary and inguinal lymph node chains.

  • Management & Infection Control:

    • Managed primarily with home supportive care and home isolation to prevent transmission to others.

    • Inpatient healthcare settings require droplet precautions.

• Measles (Rubeola):

  • Contagiousness: Identified as an extraordinarily contagious viral pathogen.

  • Pathognomonic Findings:

    • Koplik spots: Small, whitish spots situated on an erythematous mucosa inside the mouth.

    • Upper respiratory drainage and systemic viral signs.

    • The generalized body rash is typically non-pruritic.

  • Management & Safety Protocols:

    • Caregivers should administer antipyretics to manage fever.

    • Maintaining adequate fluid hydration and strict isolation are required (children must not attend school or daycare).

    • Complications & Red Flags: Viral complications include secondary infections such as otitis media (middle ear infection) and pneumonia, which can be fatal. Immediate emergency room (ER) evaluation is warranted if fever is uncontrolled by antipyretics or if the child displays clinical deterioration. Community herd immunity and vaccination status of caregivers play a critical role in exposure risks.

Erythema Infectiosum and Roseola Infantum

• Erythema Infectiosum (Fifth Disease):

  • Etiology: Caused by Human Parvovirus B19.

  • Clinical Course:

    • Initial presentation includes mild upper respiratory prodromal symptoms: cough, rhinorrhea, and lethargy/fatigue.

    • Subsequently, the pathognomonic "slapped cheek" rash appears on the face.

    • The rash progresses through distinct, sequential stages.

• Roseola Infantum (Exanthem Subitum / Sixth Disease):

  • Etiology: Caused by Human Herpesvirus 6 (HHV-6 / HSV-6).

  • Target Population: Primarily affects infants and young children aged $6\,\text{months}$ to $2\,\text{years}$.

  • Transmission: Transmitted through oral or respiratory secretions (saliva).

  • Clinical Manifestations:

    • The child initially appears relatively well with minimal systemic symptoms.

    • Abruptly develops consecutive days of very high fever.

    • The sustained high fever carries a high risk for febrile seizures (e.g., a child experiencing a fever for several days followed by a seizure requiring hospital admission and evaluation).

    • The characteristic rash develops specifically after the fever breaks/resolves.

    • Distribution: The rash is distributed over the chest, back, and extremities, while characteristically sparing the face.

  • Infection Control: Transmitted via secretions; managed with standard precautions (masking as clinically indicated).

Hand, Foot, and Mouth Disease and Mumps

• Hand, Foot, and Mouth Disease (HFMD) & Herpangina:

  • Etiology: Caused by the Coxsackievirus subgroup of Enteroviruses.

  • Clinical Formulations:

    • Herpangina: Characterized by high fever, mild upper respiratory symptoms (cough, runny nose), and vesicular eruptions located exclusively around and inside the oral cavity/mucosa.

    • Hand, Foot, and Mouth Disease: Red vesicles/eruptions occurring around and inside the mouth, as well as on the palms of the hands and soles of the feet.

  • Transmission & Manifestations:

    • Highly contagious in group settings such as daycares.

    • The patient is most contagious during the period of active fever.

    • Eruption progression: Starts as red eruptions $\rightarrow$ evolves into fluid-filled vesicles $\rightarrow$ crusts over.

  • Management:

    • No curative medication is administered; treated strictly with supportive care.

    • Lesions are non-pruritic and generally do not bother the child.

    • Maintain skin integrity with routine moisturizing and enforce strict hand hygiene protocols.

• Mumps:

  • Etiology & Prevention: Preventable via the Measles, Mumps, and Rubella (MMR) vaccine.

  • Transmission & Communicability:

    • Transmitted through infectious respiratory droplets.

    • Infected individuals are communicable for $1\text{ to }7\,\text{days}$ prior to the onset of clinical symptoms.

  • Clinical Presentation:

    • High fever.

    • Prominent swelling of the parotid salivary glands (parotitis).

  • Nursing & Clinical Considerations:

    • Inquire directly regarding the patient's immunization history upon presentation.

    • Wear appropriate personal protective equipment (droplet precautions).

    • Focus care on fever management using antipyretics and maintaining strict hydration.

    • Mumps is a legally reportable disease to public health authorities. Unvaccinated children are at severe risk for systemic complications requiring hospitalization.

Varicella (Chickenpox)

• Etiology & Transmission:

  • Caused by the Varicella-zoster virus.

  • Transmitted via airborne droplets and direct contact with blister fluid.

  • The patient is communicable before the appearance of the rash; contact tracing must go back at least $48\,\text{hours}$ prior to rash onset to notify potential contacts of exposure.

• Clinical Presentation:

  • Fever and generalized prodromal malaise.

  • An intensely pruritic (itchy) rash distributed across the scalp, face, chest, back, and extremities.

  • Lesion Progression: Red macules/papules $\rightarrow$ fluid-filled blisters/vesicles $\rightarrow$ drying out, scabbing, and crusting over.

• Management:

  • Managed with home supportive care, including fluid hydration, fever control with antipyretics, and rest.

  • Hospitalization is generally unnecessary for uncomplicated presentations.

Zoonotic and Vector-Borne Infections

• Cat Scratch Disease:

  • Etiology & Transmission: Caused by Bartonella henselae, which is harbored in the saliva of fleas/pests on cats. Transmitted when a cat scratch provides a skin portal of entry for infected saliva.

  • Clinical Manifestations:

    • Exhibits an incubation period before symptoms emerge.

    • Primary clinical manifestation is regional lymphadenopathy (axillary or inguinal lymph nodes that begin small and progress to marked enlargement).

  • Management: Monitored at home; may be prescribed an outpatient course of oral antibiotics.

• Rabies:

  • Vector & Transmission: Transmitted through the saliva of infected rabid animals (e.g., foxes, rabbits; local alerts can involve up to $24\,\text{animals}$ in short timeframes).

  • Wildlife Behavioral Markers: Rabid animals exhibit abnormal behavior, such as losing their natural fear of humans and failing to flee when approached.

  • Incubation Period: Ranges from $1\text{ to }3\,\text{months}$.

  • Prevention & Emergency Protocols:

    • Ensure domestic pets are fully vaccinated.

    • Immediate presentation to a hospital for post-exposure prophylaxis (PEP) is required following any potential contact with a rabid animal.

• Lyme Disease:

  • Transmission: Vector-borne infection transmitted via the bite of an infected deer tick during outdoor play or carried indoors by pets. Ticks seek out warm, dark anatomical sites (e.g., groin, between legs, inner thighs).

  • Parental Guidance: Parents must perform thorough full-body skin checks on children after outdoor play, paying close attention to warm, dark areas.

  • Clinical Presentation & Stages:

    • Early Signs: Fever, fatigue, headache, and neck stiffness.

    • Pathognomonic Rash: Erythema migrans (expanding "bullseye" rash).

    • Prognosis: Early localized disease carries an excellent prognosis with prompt treatment; late disease causes severe, long-term systemic consequences.

  • Pharmacotherapy (as specified in guidelines):

    • Children aged $8\,\text{years}$ or under: Doxycycline.

    • Children over $8\,\text{years}$ of age: Amoxicillin.

Parasitic Infestations: Head Lice and Scabies

• Head Lice (Pediculosis Capitis):

  • Pathophysiology & Transmission: Ectoparasitic infestation living on the human host's scalp. Spreads rapidly among children in daycares and schools via direct contact or sharing items (e.g., hats, hair accessories, close proximity during story time).

  • Incubation Period: Variable incubation period ranging up to $6\,\text{weeks}$.

  • Hair Texture Susceptibility: Seen more commonly in fine or Caucasian hair textures due to the ease with which nits attach to the hair shaft.

  • Manifestations: Intense scalp pruritus and erythematous papules on the affected area.

  • Treatment Protocol:

    • Manual removal of nits from the scalp using specialized fine-toothed combs.

    • Application of topical pediculicidal solutions or medicated shampoos.

  • Environmental Decontamination:

    • Wash all bedsheets, hats, and clothing in hot water and dry on high heat in a hot dryer.

    • Non-washable items (e.g., stuffed animals) must be sealed tightly in an airtight plastic trash bag for $72\,\text{hours}$ ($3\,\text{days}$) to starve and kill the parasites.

• Scabies:

  • Pathophysiology: Microscopic scabies mites burrow under the stratum corneum of the skin to lay eggs.

  • Clinical Manifestations:

    • Erythematous eruptions with a crusted appearance.

    • Diagnostic linear burrow tracks (small squiggly lines in the skin).

    • Common anatomical sites: Interdigital spaces (between fingers), wrists, or direct contact sites.

    • Key Diagnostic Sensation: Severe, intense itching that worsens significantly at night due to nocturnal mite feeding activity.

  • Infection Control & Patient Education:

    • Healthcare settings require contact precautions.

    • Reassure parents that scabies infestation is not an indicator of poor hygiene or unhygienic living conditions.

    • Environmental Risk Factor: Environmental rodent infestations (e.g., rodents nesting in or eating through mattresses) can cause severe nocturnal rashes and bites.

  • Permethrin Treatment Procedure:

    • Topical Permethrin cream requires simultaneous treatment of all household members.

    • Step 1: Patient takes a complete shower.

    • Step 2: Apply Permethrin cream topically from head to toe, covering all skin surfaces.

    • Step 3: Leave the cream on the body for $12\text{ to }14\,\text{hours}$.

    • Step 4: Completely wash off the cream the following day (typically a single application).

Questions and Discussion

• Hand, Foot, and Mouth Disease Contagiousness:

  • Question: Is the infection more contagious during or after the fever?

  • Clarification: Contagiousness is highest during the active fever phase.

• Tick Removal and Location Observations:

  • Discussion: Deer ticks demonstrate a strong preference for warm, dark anatomical locations, such as the groin or the inner/back aspect of the legs. Children frequently discover them while showering after outdoor play in shorts.