Chapter 18: Neurocognitive Disorders

The text meticulously differentiates between the three primary categories of NCDs: delirium, mild neurocognitive disorders, and major neurocognitive disorders (dementia). Delirium is defined as an acute, transient disturbance in attention and awareness that develops rapidly and fluctuates in severity, often secondary to physiological causes like infection, metabolic imbalances, or substance withdrawal. The summary details the critical nursing role in identifying underlying etiologies using tools like the Confusion Assessment Method (CAM) and ensuring biophysical safety to prevent permanent neurological damage. In contrast, the chapter explores the progressive and irreversible nature of Major Neurocognitive Disorders, using Alzheimer's Disease (AD) as the primary exemplar. It delves into the neuropathology of AD, including the accumulation of beta-amyloid plaques, the formation of neurofibrillary tangles associated with tau protein, and neurochemical deficits in acetylcholine and glutamate. The clinical presentation is broken down into stages—mild, moderate, and severe—highlighting the "four A's" of cognitive impairment: amnesia (memory loss), aphasia (loss of language), apraxia (loss of purposeful movement), and agnosia (loss of sensory recognition). The text emphasizes evidence-based nursing interventions, such as validation therapy and reminiscence therapy, to manage behavioral symptoms like wandering, agitation, and sundowning. Furthermore, it covers pharmacological management, including the use of cholinesterase inhibitors (e.g., donepezil, rivastigmine) and NMDA receptor antagonists (e.g., memantine) to slow cognitive decline. Finally, the chapter addresses the holistic needs of the family unit, stressing the importance of identifying caregiver role strain, providing education on safety and disease progression, and connecting families with community resources to support long-term care.