Chapter 30: Neuromuscular & Muscular Dysfunction in Children

Neuromuscular & Muscular Dysfunction in Children from Wong’s Essentials of Pediatric Nursing provides a comprehensive examination of the child with neuromuscular or muscular dysfunction, covering a wide array of congenital and acquired disorders that affect motor tone, movement, and physical development. The text begins by exploring Cerebral Palsy (CP), the most common permanent physical disability in childhood, detailing its classification into spastic, dyskinetic, ataxic, and mixed types based on motor abnormalities and anatomic distribution. The discussion emphasizes that while birth asphyxia was traditionally blamed, prenatal brain abnormalities are the most frequent cause, and outlines therapeutic management including the use of ankle-foot orthoses, orthopedic surgery to correct contractures, and pharmacologic interventions like intrathecal baclofen and botulinum toxin A to manage spasticity. A significant portion of the chapter is dedicated to defects of neural tube closure, specifically Spina Bifida and myelomeningocele, explaining the pathophysiology of these midline defects and the critical preventive role of folic acid supplementation. It details the multidisciplinary care required for associated complications such as hydrocephalus, Chiari II malformation, neurogenic bladder managed via clean intermittent catheterization, and the risk of latex sensitization. The chapter also addresses Spinal Muscular Atrophy (SMA), particularly Type 1 (Werdnig-Hoffmann disease), describing its genetic basis involving the SMN gene, clinical signs of progressive weakness and wasting, and the emergence of gene-targeted therapies like nusinersen. Acquired neuromuscular disorders are thoroughly reviewed, including Guillain-Barré Syndrome (GBS) with its characteristic acute ascending paralysis and immune-mediated demyelination, as well as infectious conditions like Tetanus and Botulism. The text highlights the specific risks of infant botulism, often associated with honey ingestion, and its management with botulism immune globulin. Furthermore, the chapter covers Spinal Cord Injuries (SCI) in the pediatric population, focusing on unique mechanisms such as SCI without radiographic abnormality (SCIWORA), the emergency management of autonomic dysreflexia, and rehabilitation goals. Juvenile Dermatomyositis (JDM) is described as an autoimmune vasculopathy presenting with proximal muscle weakness and characteristic skin rashes like the heliotrope rash. Finally, the chapter concludes with a detailed overview of Muscular Dystrophies, with a primary emphasis on Duchenne Muscular Dystrophy (DMD). It explains the X-linked recessive inheritance pattern resulting in dystrophin deficiency, key clinical manifestations such as the Gower sign and pseudohypertrophy, and the trajectory of the disease leading to respiratory and cardiac failure, alongside management strategies to optimize quality of life.