Introduction and Definition of Astasia Astasia, derived from the Greek terms meaning “not standing,” is a neurological or functional symptom characterized by the severe impairment of motor coordination necessary to maintain an upright posture, resulting in the inability to stand. Crucially, this condition is not defined by simple muscular weakness or paralysis (paresis or plegia), […]
Normal-Pressure Hydrocephalus (NPH) The Core Definition of Normal-Pressure Hydrocephalus Normal-pressure hydrocephalus (NPH) is a neurological condition characterized by an abnormal accumulation of cerebrospinal fluid (CSF) within the brain’s ventricles, leading to a distinctive triad of symptoms: gait disturbance, urinary incontinence, and cognitive impairment. Despite the term “normal-pressure,” referring to CSF pressure that may appear within […]