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Related Concept Videos

Disorder of Water Balance01:29

Disorder of Water Balance

Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
Regulation of Water Intake01:25

Regulation of Water Intake

Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Hemodialysis II: Procedure and Complications01:24

Hemodialysis II: Procedure and Complications

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,...
Hyperosmolar Hyperglycemic State01:21

Hyperosmolar Hyperglycemic State

Hyperosmolar Hyperglycemic State, or HHS, is a serious and life-threatening complication of type 2 diabetes mellitus. It is characterized by three main features: severe hyperglycemia, profound dehydration, and elevated serum osmolality, all occurring without significant ketoacidosis.HHS typically develops in older adults or individuals with limited access to fluids. This may result from illness, cognitive impairment, or medications such as diuretics or corticosteroids. These factors reduce...
Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous supply...
Ionic Bonds00:42

Ionic Bonds

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.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...

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Related Experiment Video

Updated: Jun 22, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

Exercise-associated hyponatremia.

Mitchell H Rosner1

  • 1Division of Nephrology, University of Virginia Health System, Charlottesville, VA 22908, USA. mhr9r@virginia.edu

Seminars in Nephrology
|June 16, 2009
PubMed
Summary
This summary is machine-generated.

Exercise-associated hyponatremia (EAH) affects endurance athletes due to excessive fluid intake and impaired kidney function. While often mild, severe cases require prompt treatment to prevent life-threatening complications.

Related Experiment Videos

Last Updated: Jun 22, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

Area of Science:

  • Sports Medicine
  • Endocrinology
  • Nephrology

Background:

  • Disorders of serum sodium are common in endurance athletes.
  • Hyponatremia is a potentially life-threatening condition affecting 2-7% of participants.
  • Exercise-associated hyponatremia (EAH) results from excessive fluid intake and hormonal factors.

Purpose of the Study:

  • To review the causes, clinical presentation, and management of EAH.
  • To highlight the risk factors and pathophysiology of EAH.
  • To emphasize the importance of rapid diagnosis and treatment for severe cases.

Main Methods:

  • Literature review of EAH pathogenesis and clinical management.
  • Analysis of factors contributing to water retention and sodium imbalance.
  • Discussion of diagnostic criteria and therapeutic interventions.

Main Results:

  • EAH is caused by excessive hypotonic fluid intake and elevated arginine vasopressin levels.
  • Other contributing factors include sweat sodium loss and impaired renal function.
  • Most EAH cases are mild, but severe cases can lead to cerebral and pulmonary edema.

Conclusions:

  • EAH requires careful monitoring and fluid restriction in most athletes.
  • Severe EAH necessitates prompt administration of hypertonic saline to prevent mortality.
  • Understanding EAH pathophysiology is crucial for effective prevention and management strategies.