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Related Concept Videos

Disorder of Water Balance01:29

Disorder of Water Balance

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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...
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Regulation of Water Intake01:25

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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...
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Primary Motives: Hunger and Thirst01:25

Primary Motives: Hunger and Thirst

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Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
Hunger arises when the brain detects changes in the body's nutrient levels, including glucose, lipids, amino acids, and hormones such as ghrelin and leptin. The hypothalamus plays a central role in hunger regulation. The lateral hypothalamus...
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Regulation of Water Output01:26

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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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Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

Physiology of the Genitourinary System III: Urine Concentration and Dilution

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The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...
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Formation of Concentrated Urine01:23

Formation of Concentrated Urine

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There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...
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Updated: Sep 14, 2025

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'Un-thirsty' hypernatremia.

Markus Koster1, Katrin Ledergerber2, Michael Brändle1,2

  • 1Endocrinology, Diabetes, Osteology and Metabolism, Kantonsspital St. Gallen, St. Gallen, Switzerland.

Endocrinology, Diabetes & Metabolism Case Reports
|July 24, 2025
PubMed
Summary
This summary is machine-generated.

Adipsic vasopressin deficiency (aAVP-D) is a rare syndrome combining vasopressin deficiency and loss of thirst. Treatment involves desmopressin acetate, fluid management, and monitoring for patients with ACOM aneurysm complications.

Keywords:
hypothalamusneuroendocrinologypituitaryrare diseases/syndromes

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Area of Science:

  • Neuroendocrinology
  • Neurosurgery
  • Intensive Care Medicine

Background:

  • A 38-year-old male presented with transient somnolence following subarachnoid hemorrhage from an anterior communicating artery (ACOM) aneurysm.
  • The patient had undergone craniotomy and clipping for the ACOM aneurysm, with persistent memory deficits and forehead paresis.

Observation:

  • Severe hypernatremia (179 mmol/L) was detected despite adequate fluid intake, accompanied by polyuria (400 mL/h) and a lack of thirst.
  • Central diabetes insipidus (DI) or vasopressin deficiency (VD) was diagnosed, confirmed by the response to desmopressin acetate.

Findings:

  • The patient exhibited adipsic vasopressin deficiency (aAVP-D), a rare condition characterized by VD and impaired thirst sensation.
  • Management required careful titration of desmopressin acetate, supervised fluid intake due to amnesia, and regular monitoring of serum sodium levels.

Implications:

  • ACOM aneurysm rupture and subsequent surgical clipping are identified as potential causes of aAVP-D due to damage to periventricular osmoreceptors.
  • Effective management of aAVP-D necessitates a multidisciplinary approach including hormone replacement, hydration management, patient education, and vigilant monitoring.