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Acquired Cardiac Disorders in Children
Bacterial (Infective) Endocarditis (BE)

  • Definition:

         - An inflammatory process resulting from infection of the valves and inner lining of the heart.

Incidence & Etiology of Bacterial Endocarditis

  • Increased susceptibility in children with Congenital Heart Disease (CHD) or acquired heart disease due to structural abnormalities that compromise normal blood flow and immune response.

  • Increased risk factors include:

         - Dental procedures

              - Why: This causes bacteremia as bacteria enter the bloodstream from the oral cavity.
         - Surgery

              - Why: Surgical interventions can introduce bacteria into the bloodstream.
         - Presence of intracardiac lines.

              - Why: Intravenous lines can serve as a pathway for bacteria to enter the bloodstream.

  • Most common causative agent:

         - Streptococcus viridans: Other organisms can include:

         - Staphylococcus aureus

         - Gram-negative bacteria

         - Fungi such as Candida albicans.
              - Why: These microorganisms can colonize damaged heart valves or endocardial surfaces, leading to infection.

Pathophysiology of Bacterial Endocarditis

  • Infection process:

         - Organisms enter bloodstream from a localized infection.

              - Why: Localized infections can shed bacteria into the bloodstream.
         - Grow on the endocardium.

              - Why: The endocardium provides a surface for bacterial colonization, particularly on damaged valves.
         - Formation of vegetations, fibrin deposits, and platelet thrombi.
              - Why: Immune response and the presence of bacteria lead to an inflammatory process, resulting in these structures.

  • Potential consequences:

         - Lesions may invade adjacent tissues or fragment and embolize to other areas of the body.
              - Why: This can lead to systemic complications, including organ ischemia or infarcts.

Clinical Manifestations of Bacterial Endocarditis

  • Symptoms include:

         - Low-grade intermittent fever

              - Why: Due to persistent bacteremia and the immune response activating fever pathways.
         - Anorexia

              - Why: Result of systemic inflammation and metabolic changes influencing hunger.
         - Malaise

              - Why: Ongoing immune activation results in fatigue.
         - Weight loss

              - Why: Secondary to anorexia and increased metabolic demands due to infection.
         - Joint pain

              - Why: Immune complexes deposit in the joints, leading to inflammation without infection.
         - Positive blood culture

              - Why: Indicates the presence of bacteria in the bloodstream.
         - New heart murmur or changes in an existing murmur

              - Why: Changes are caused by vegetations disrupting blood flow across valves.
         - Petechiae of mucous membranes

              - Why: Result from small capillary bleeding due to infection-induced damage.
         - Janeway spots

              - Why: Result from septic emboli leading to hemorrhagic lesions.
         - Osler Nodes

              - Why: Painful nodules due to localized immune response.
         - Splinter hemorrhages under nails.

              - Why: Caused by small emboli damaging capillaries in the nail bed.

Pathophysiology Explanation of Symptoms

  • Low-Grade Intermittent Fever:

         - Caused by persistent bacteremia leading to an immune response and reset in hypothalamic temperature.

  • Anorexia:

         - Secondary to systemic inflammation and redirected energy usage away from hunger signals.

  • Malaise:

         - Due to elevated cytokine levels and increased metabolic workload from the ongoing immune activation.

  • Weight Loss:

         - Resulting from both decreased intake from appetite loss and increased demand of the body’s metabolism due to infection.

  • Joint Pain (Arthralgia):

         - Result of immune complexes causing local inflammation in joints.

  • Positive Blood Culture:

         - Indicates bacteria are being continuously shed from the infected valves.

  • New Heart Murmur or Changes:

         - Resulting from vegetations on heart valves altering normal blood flow patterns.

  • Petechiae of Mucous Membranes:

         - Caused by small capillary bleeding due to vascular injury or infection.

  • Janeway Spots:

         - Indicative of septic emboli causing painless hemorrhagic spots on skin.

  • Osler Nodes:

         - Resulting from immune-mediated inflammatory response leading to painful inflammation.

  • Splinter Hemorrhages:

         - Damaged nail-bed capillaries lead to linear streaks from small emboli.

Therapeutic Management of Bacterial Endocarditis

  • Treatment typically includes:

         - Intravenous Antibiotics: Administered for 2 to 8 weeks.

              - Why: To effectively eradicate the infection, restore health and prevent complications.
         - Surgical Intervention: Consideration for significant emboli removal or valve replacement.

              - Why: Necessary when there is severe damage that cannot be managed with antibiotics alone.

  • Prevention:

         - Prophylactic antibiotics recommended one hour before any risky procedure, particularly for:

         - Patients with artificial heart valves.

              - Why: These patients are particularly vulnerable to infections due to their foreign material.
         - Previous diagnosis of infective endocarditis.

              - Why: Past infections increase the likelihood of future occurrence.
         - Children with congenital heart disease, particularly those with unrepaired cyanotic defects or those using prosthetic material.

              - Why: These conditions inherently predispose children to increased risks for infections.

Nursing Considerations for Bacterial Endocarditis

  • Education on prophylactic antibiotic therapy.

  • Instructing families on how to administer IV antibiotics at home.

         - Why: Ensures adherence to treatment plans and effective management of the condition.

  • Management for symptomatic relief.

         - Why: Aims to alleviate discomfort associated with fever and pain.

  • Monitoring for embolic events.

         - Why: Essential to detect and respond to potential complications early.

Rationale for Nursing Interventions

  • Prevent Prophylactic Antibiotic Therapy: Aimed to avoid future bacteremia affecting damaged heart valves.

  • Family Training on IV Antibiotics: Ensures effective treatment to eradicate bacteria completely and prevent complications.

  • Symptomatic Relief Measures: Help in alleviating the systemic symptoms stemming from infection.

  • Monitoring for Emboli: Critical to proactively manage risks of complications such as organ ischemia or embolic strokes.

Primary Nursing Intervention to Prevent Bacterial Endocarditis

  • Optimal preventive strategies include counseling parents of high-risk children, monitoring for complications, and educating on measures to avoid bacteremia during dental procedures.

Rheumatic Fever (RF)

  • Definition:

         - A systemic inflammatory disease following an infection with group A beta-hemolytic streptococcus.

         - Involvement of an autoimmune reaction against the strep bacteria's antibodies can lead to long-term complications.

  • Aschoff Bodies:

         - Inflammatory lesions formed leading to swelling, fragmentation, and connective tissue alterations.

         - May result in rheumatic heart disease due to valvular damage.

Incidence & Etiology of Rheumatic Fever

  • Most commonly observed in school-age children, with risk factors related to genetic, environmental, and socioeconomic conditions.

  • Symptoms typically arise 2 to 6 weeks post upper respiratory infection.

         - Why: Represents the time required for the immune system to react to the initial infection.

  • More prevalent in males; cases peak in late winter or early spring.

         - Why: Increased incidence linked to wintertime respiratory infections.

  • Diagnosis is made using the Jones criteria — requiring either two major manifestations or one major and two minor manifestations.

Clinical Manifestations of Rheumatic Fever

Major Manifestations:

  • Polyarthritis

         - Why: Inflammation targeting joints, typically presenting in a migratory pattern.

  • Carditis

         - Why: Inflammation of myocardium leading to potential heart failure.

  • Chorea

         - Why: Inflammatory changes in basal ganglia causing movement disorders.

  • Erythema marginatum

         - Why: Immune-mediated skin changes result in distinctive rash.

  • Subcutaneous nodules

         - Why: Resulting from immune system activity over bony prominences.

Minor Manifestations:

  • Arthralgia

         - Why: Joint pain reflecting local inflammation responses.

  • Low-grade fever

         - Why: Indicative of the body’s inflammatory response.

  • Elevated ASO titer (Antistreptolysin-O)

         - Why: Reflects recent strep infection linked to autoimmune responses.

  • Abdominal pain

         - Why: May involve inflammatory responses in abdominal tissues or mesenteric lymph nodes.

Pathophysiology of Rheumatic Fever Symptoms

  • Polyarthritis: Inflammation arises from autoimmunity where antibodies target joint tissues due to molecular mimicry.

  • Carditis: Heart inflammation occurs following an immune response aimed at strep infection, potentially leading to permanent heart damage.

  • Chorea: Results from basal ganglia inflammation causing neurological symptoms.

  • Erythema Marginatum: Unique rash forms due to immune complexes damaging skin tissues.

  • Subcutaneous Nodules: Reflect chronic inflammation, forming these nodules in response to identifiable triggers.

Further Explanation of Minor Symptoms

  • Arthralgia: Links back to systemic autoimmune responses leading to localized pain.

  • Low-Grade Fever: Fluctuates due to active inflammatory processes via systemic immune activation.

  • Elevated ASO Titer: Indicates an ongoing immune response against strep bacteria.

  • Abdominal Pain: Part of the systemic inflammatory process impacting abdominal structures.

Therapeutic Management of Rheumatic Fever

  • Focused on eradicating group A beta-hemolytic streptococci and preventing heart damage:

         - Salicylates for inflammation control.

              - Why: Helps to relieve pain and reduce inflammation.
         - Possible corticosteroids to further manage inflammation.

              - Why: Enables reduction of systemic inflammation and stabilization of vitals.
         - Rest is crucial to support recovery.

              - Why: Preventing excessive cardiac workload aids in healing and recovery.

  • Prevention:

         - Long-term prophylactic antibiotics (e.g., IM penicillin) every 28 days for 5-10 years or until the patient reaches 21, or longer if at high risk.

              - Why: To minimize the risk of recurrent infections that could trigger a repeat of rheumatic fever.

Nursing Considerations for Rheumatic Fever

  • Disease prevention strategies.

         - Why: Essential in minimizing the reoccurrence potential of rheumatic fever.

  • Encourage adherence to prescribed drug regimens, particularly prophylactic antibiotics.

         - Why: Consistency in treatment allows for effective prevention of streptococcal infections.

  • Support recovery through adequate rest, nutrition, and pain management.

         - Ensured optimal conditions for recovery while managing systemic effects.

  • Provide emotional support to both child and family during treatment.

         - Why: Addressing psychological stressors that accompany chronic illness management is crucial.

Rationale for Nursing Interventions

  • Disease Prevention: Impacts long-term heart positioning to minimize possible long-term effects.

  • Compliance with Regimens: Ensures continual defense against streptococcal infections which can exacerbate symptoms.

  • Facilitating Recovery: Essential to healing and reducing future complications of the disease.

  • Emotional Support: Reduces anxiety and improves treatment adherence within the family.

Kawasaki Disease (Mucocutaneous Lymph Node Syndrome)

  • Description:

         - An acute systemic vasculitis of unknown etiology, suspected to involve an infectious component creating profound cardiovascular risks.

Incidence of Kawasaki Disease

  • Typically affects pre-pubertal children, principally boys under 2 years old.

         - Why: Age predisposition linked to immune system maturity stages.

  • More commonly diagnosed in winter and spring.

         - Why: Seasonal infections might contribute to heightened incidence rates.

  • The condition usually resolves without treatment; however, approximately 20% may develop serious cardiac sequelae.

         - Why: Ongoing inflammation poses risks for coronary artery damage leading to life-threatening consequences.

Clinical Manifestations of Kawasaki Disease

Acute Phase (8-10 days):

  • Fever: Persistent high fever.

         - Why: Cytokine dysregulation leads to sustained temperature elevation.

  • Pruritic Polymorphic Rash: Varied rash with itchiness.

         - Why: Inflammatory cytokines promote vasodilation and capillary permeability.

  • Cervical Lymphadenopathy: Enlargement of cervical lymph nodes.

         - Why: Immune response leads to lymph nodes reacting to systemic inflammation.

  • Dry, Red, Cracked Lips: Caused by vasculitis affecting mucosal integrity.

         - Why: Reduced blood flow and inflammatory responses create dryness and fissures.

  • Strawberry Tongue: Swollen red appearance due to inflammation.

         - Why: Indicating vasculitis affecting vascularization of the tongue tissues.

Pathophysiology of Clinical Symptoms in Acute Phase

  • Fever: Continuous cytokine release maintains elevated hypothalamic set point due to inflammation.

  • Pruritic Rash: Caused by immune-mediated inflammatory responses leading to blood vessel permeability changes.

  • Cervical Lymphadenopathy: Lymph nodes hyperplasia from immune stimulation resulting from infection exposure.

  • Cracked Lips and Strawberry Tongue: Result from systemic vasculitis creating conditions for sores and dryness due to mucosal blood vessel involvement.

Additional Symptoms During Acute Phase

  • Bilateral Conjunctivitis: A form of non-exudative redness due to inflammation of conjunctival vessels.

         - Why: Immune-mediated damage from systemic vasculitis.

  • Erythema and Swelling of Palms and Soles: Indicative of vascular damage leading to local erythema intensity.

         - Why: Swelling and redness signify localized inflammatory processes resulting from vasculitis.

Clinical Manifestations of Kawasaki Disease: Subacute Phase (10-35 days)

  • Begins as fever resolution occurs, characterized by:

         - Ongoing vasculitis may continue affecting systemic systems.

         - Desquamation of fingers, toes, and palms due to compromised skin integrity.

         - Possible arthritis indicating joint inflammation response due to ongoing immune activity.

         - Thrombocytosis as a reactive response further complicating risks of clotting issues during healing.

Pathophysiology in the Subacute Phase

  • Desquamation: Skin loss occurs as healing progresses following endothelial inflammation dynamics.

  • Arthritis: Ongoing immune-mediated mechanisms affecting synovial tissues.

  • Thrombocytosis: Reactive increase of platelets due to persistent inflammatory state as the body attempts to facilitate healing and manage vascular injuries.

Clinical Manifestations of Kawasaki Disease: Convalescent/Recovery Phase (up to 10 weeks)

  • Characterized by:

         - Absence of symptoms as healing occurs.

         - Completion of phase occurs upon normalization of laboratory values after resolving inflammatory processes.

         - Notably, this phase is considered the most dangerous due to potential coronary artery complications.

              - Why: The risk remains high for ongoing vascular injury which could manifest even after clinical symptoms resolution.

Discussion Question

  • Discuss the reasons why the convalescent phase of Kawasaki disease poses the greatest risk to patients.

Signs/Symptoms of Myocardial Infarction in Children

  • Non-specific but can include:

         - Abdominal pain

              - Why: Reflected through decreased blood flow and oxygenation affecting visceral organs.
         - Vomiting

              - Why: Secondary to autonomic disturbance during cardiac events.
         - Restlessness

              - Why: Disruption in normal oxygenation leading to heightened anxiety/fear response.
         - Inconsolable crying

              - Why: Child discomfort signaling physiological strain during cardiac events.
         - Pallor

              - Why: Resultant from compromised blood flow leading to decreased perfusion.
         - Shock

              - Why: Severe decrease in cardiac output can induce critical body responses stemming from reduced circulation.

Therapeutic Management of Kawasaki Disease

  • Start high-dose salicylates promptly on admission for anti-inflammatory and antiplatelet effects; continue until the child is afebrile for 48-72 hours. Transition to low-dose ASA thereafter.

         - Why: To manage inflammation and decrease clot formation risk during acute phases.

  • High-dose intravenous gamma globulin must be administered within 10 days of fever onset.

         - Why: Provides rapid immunomodulatory effects and reduces the likelihood of coronary artery damage.

Nursing Considerations for Kawasaki Disease

  • Close monitoring of cardiac status, including oxygen and respiratory measures.

         - Why: Maximal vigilance is needed due to heightened risk of myocarditis and other cardiac complications.

  • Frequent vital sign assessments, daily weight evaluations.

         - Why: Assessments help track disease progression and response to treatments while preventing complications.

  • Administer gamma globulin safely and monitor for reactions due to potential complications from vascular impacts in myocarditis.

         - Why: Ensure patient safety and monitor vascular response to treatment interventions effectively.

Rationale for Nursing Interventions

  • Monitor Cardiac Status Closely: Alters vascular dynamics which can impact coronary perfusion and myocardial health significantly.

  • Respiratory Monitoring: Important as compromised cardiac output can lead to respiratory distress and further complications.

  • Intake & Output (I&O) Monitoring: Critical in evaluating overall fluid management and heart function to detect early signs of distress or failure.

  • Weight Checks: Sensitive indicator of potential fluid retention or overload; influences cardiovascular function.

  • Carefully Administer Fluids: Prevents rapid rises that could overwhelm a compromised cardiac system.

  • Watch for Myocardial Infarction Symptoms: Essential to detect and respond to vascular inflammation effectively, given its high stakes during treatment.

  • Safely Administer Gamma Globulin: Mediating significant reduction in inflammation risk while following blood product safety protocols is paramount.

Further Nursing Considerations for Kawasaki Disease

  • Symptomatic Relief: Focus on skin care, oral hygiene, nutrition, and emotional support for irritability during treatment to improve overall well-being of the patient.

  • Discharge Teaching: Important to educate families on disease progression, potential complications, and the need for immunizations post-gamma globulin treatment due to potential vaccine efficacy reduction.

         - Why: Ensures that the family is well-prepared for ongoing care and recovery, reducing risk during convalescence.