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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 17, 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

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

The Physician and Sportsmedicine
|January 6, 2010
PubMed
Summary
This summary is machine-generated.

Hyponatremia, a common disorder in endurance athletes, results from excessive fluid intake and impaired water excretion. Prompt diagnosis and hypertonic saline therapy are crucial for severe cases to prevent life-threatening complications.

Related Experiment Videos

Last Updated: Jun 17, 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
  • Exercise Physiology
  • Endocrinology

Background:

  • Hyponatremia is a common electrolyte disorder in endurance athletes, affecting 2-7% of participants.
  • It arises from excessive water intake and elevated arginine vasopressin levels, hindering kidney water excretion.
  • While often mild, severe cases can lead to cerebral edema and pulmonary edema.

Purpose of the Study:

  • To highlight the risks and management of hyponatremia in endurance athletes.
  • To emphasize the importance of rapid diagnosis and treatment for symptomatic hyponatremia.
  • To underscore the role of education in preventing overhydration during endurance events.

Main Methods:

  • Review of existing literature on hyponatremia in endurance sports.
  • Analysis of the physiological mechanisms underlying hyponatremia.
  • Discussion of diagnostic and therapeutic strategies, including on-site serum sodium measurement.

Main Results:

  • Hyponatremia is frequently observed, with most cases being mild.
  • Severe symptomatic hyponatremia can cause cerebral edema and is life-threatening.
  • Rapid diagnosis and treatment with hypertonic saline are effective for severe cases.

Conclusions:

  • Effective management of hyponatremia in athletes requires prompt recognition and appropriate intervention.
  • On-site serum sodium measurement aids in timely diagnosis and treatment.
  • Prevention strategies focus on educating athletes about the risks of overhydration and judicious fluid intake.