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DialyzersA hemodialysis (HD) dialyzer is a plastic cartridge containing thousands of parallel hollow fibers, which serve as semipermeable membranes. These fibers are typically made from cellulose-based or other synthetic materials. During HD, blood is pumped into the top of the cartridge and distributed among these fibers. Simultaneously, dialysis fluid, known as dialysate, is introduced into the bottom of the cartridge, bathing the outside of the fibers. Across the semipermeable membrane,...
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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Exercise-Associated Hyponatremia.

Tamara Hew-Butler

    Frontiers of Hormone Research
    |February 26, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Exercise-associated hyponatremia (EAH) is low sodium during exercise, often due to overhydration. Drinking to thirst is key to preventing this potentially dangerous condition in athletes.

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    Area of Science:

    • Sports Medicine
    • Exercise Physiology
    • Endocrinology

    Background:

    • Exercise-associated hyponatremia (EAH) involves low serum sodium levels during physical activity.
    • Its development is a spectrum influenced by excessive fluid intake (polydipsia) or sweat sodium loss, leading to dilution or hypovolemia.
    • Non-osmotic arginine vasopressin (AVP) drives abnormal water retention in symptomatic EAH.

    Purpose of the Study:

    • To review the pathogenesis, diagnosis, treatment, and prevention of exercise-associated hyponatremia.
    • To highlight the role of AVP in EAH and the varied clinical presentations.
    • To emphasize individualized hydration strategies for athletes.

    Main Methods:

    • Literature review of EAH pathogenesis, clinical manifestations, and management strategies.
    • Analysis of the role of arginine vasopressin (AVP) in fluid balance during exercise.
    • Synthesis of diagnostic criteria and treatment protocols for varying EAH severity.

    Main Results:

    • EAH occurs across various sports, not just endurance events.
    • Vague symptoms like headache and altered mental status can indicate EAH, requiring blood confirmation.
    • Treatment varies from fluid restriction for mild cases to urgent hypertonic saline for severe encephalopathy.

    Conclusions:

    • Arginine vasopressin (AVP) is central to the pathophysiology of acute symptomatic EAH.
    • Drinking to thirst is the most effective individualized strategy to prevent EAH and life-threatening dysnatremia.
    • Athletes should prioritize thirst over fixed hydration schedules to maintain safe sodium levels.