Chapter 42: Cardiovascular Dysfunction in Children

Cardiovascular Dysfunction in Children exploration of pediatric cardiovascular health focuses on the critical distinction between congenital heart disease (CHD), which involves anatomical abnormalities present at birth, and acquired cardiac disorders that develop later due to infection, autoimmune responses, or environmental triggers. The material details the physiological transition from fetal circulation to independent life, highlighting how the closure of the foramen ovale and ductus arteriosus reshapes cardiac hemodynamics after the first breath. Structural defects are systematically categorized by their impact on blood flow: conditions that increase pulmonary volume (like ventricular septal defects), obstructive lesions (such as coarctation of the aorta), and cyanotic defects that decrease pulmonary flow (like Tetralogy of Fallot). Clinical management of pediatric heart failure (HF) is a central theme, emphasizing the use of digitalis glycosides and ACE inhibitors to improve contractility and reduce afterload, alongside diuretics to manage fluid overload. For infants experiencing chronic hypoxemia, the text describes compensatory mechanisms like polycythemia and clubbing, as well as emergency interventions for hypercyanotic "tet" spells, such as placing the infant in the knee-chest position. Beyond structural issues, the sources cover acquired conditions including the immunological impact of rheumatic fever, which follows a streptococcal infection and is diagnosed using the Jones criteria, and the systemic vasculitis seen in Kawasaki disease. It also addresses modern health challenges like hyperlipidemia screening and the management of pediatric hypertension through lifestyle and pharmacological interventions. Advanced therapeutic options, including cardiac catheterization, multi-stage surgical palliation for single ventricle anatomy, and heart transplantation, are discussed with an emphasis on comprehensive nursing care and family support. Finally, providers are prepared for acute crises such as septic and anaphylactic shock and the newly identified multisystem inflammatory syndrome (MIS-C), ensuring a holistic understanding of cardiovascular dysfunction from diagnostic evaluation to long-term home care.