Chapter 55: Neurological System

Understanding neurotransmitter function and dysfunction forms a critical foundation, as these chemical messengers regulate motor control, mood, and cognition while their imbalances contribute to disease pathology. The chapter systematically covers neurological assessment techniques, emphasizing the Glasgow Coma Scale as a standardized tool for measuring consciousness and the evaluation of pupillary responses, cranial nerve function, and reflex patterns. Diagnostic procedures including magnetic resonance imaging, computed tomography, electroencephalography, lumbar puncture, and cerebral angiography are explained with attention to client preparation, safety considerations, and interpretation of findings. The chapter then addresses major pathological conditions organized by etiology and presentation: acute conditions like stroke and increased intracranial pressure demand rapid assessment and intervention; neurodegenerative diseases including Parkinson's disease, amyotrophic lateral sclerosis, and multiple sclerosis require long-term management strategies; autoimmune and inflammatory disorders such as myasthenia gravis and Guillain-Barré syndrome necessitate specific therapeutic approaches; and infectious conditions like meningitis and encephalitis require isolation precautions and aggressive treatment. Spinal cord injuries are explored by neurological level and severity, with emphasis on autonomic dysreflexia as a life-threatening emergency and rehabilitation principles. The autonomic nervous system's role in coordinating physiological responses is integrated throughout. Nursing interventions focus on airway protection, hemodynamic stability, intracranial pressure management, seizure precautions, infection prevention, and comprehensive client education for medication adherence and lifestyle adaptation. Post-operative considerations for craniotomy patients and immobilization device management complete the practical clinical content.