Q and A: about health and research

Chronic hyponatremia is a medical condition in which the concentration of sodium in the blood falls below 135 mEq/L for 48 hours or longer. Sodium is one of the body’s most important electrolytes. It helps regulate fluid balance, nerve signaling, muscle contraction, and normal brain function. When sodium levels decline gradually over time, the body attempts to adapt, particularly within the brain. Although this adaptation reduces the immediate danger of brain swelling, chronic hyponatremia is far from harmless. For many years, chronic hyponatremia was often considered “mild” or “asymptomatic,” especially when sodium levels were only modestly reduced. Research now shows that even mild chronic reductions in sodium can significantly affect cognition, balance, bone health, and overall physical function. The condition is especially common among older adults, hospitalized patients, individuals taking certain medications, and people with chronic illnesses involving the heart, kidneys, liver,...

Normal Pressure Hydrocephalus (NPH) is a neurological condition marked by an abnormal buildup of cerebrospinal fluid (CSF) in the brain's ventricles. Unlike other forms of hydrocephalus, NPH does not lead to a significant increase in intracranial pressure. Instead, the ventricles gradually enlarge, causing pressure on surrounding brain tissue, particularly in regions responsible for motor function, cognition, and bladder control. What Causes NPH? The exact cause of NPH is often unclear, but it is generally divided into two categories: Primary (Idiopathic) NPH This form appears without any identifiable trigger. The leading hypothesis is impaired CSF resorption—meaning the brain’s natural system for reabsorbing fluid into the bloodstream is dysfunctional. The resulting fluid buildup gradually distends the ventricles. Secondary NPH Secondary NPH arises as a result of other medical conditions or events that disrupt the flow or absorption of CSF. Common causes include: Brain h...