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Ionic Bonds00:42

Ionic Bonds

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Overview
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 Compounds
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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
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Causes:
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Signs and Symptoms:
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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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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...
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Definition Diabetes insipidus is a disorder marked by the production of large amounts of dilute urine because of impaired vasopressin production, release, or kidney response. The lack of effective vasopressin action limits water reabsorption in the renal collecting ducts, which leads to excessive urinary water loss and intense thirst.Clinical PresentationIndividuals with diabetes insipidus report persistent thirst and very high urine output. In severe cases, fluid intake can reach up to 20...
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[Hyponatremia].

Miroslaw Jedras1, Grzegorz Ostrowski2

  • 1Katedra i Klinika Nefrologii, Dializoterapii i Chorób Wewnetrznych, Warszawski Uniwersytet Medyczny. zacio@wp.pl

Wiadomosci Lekarskie (Warsaw, Poland : 1960)
|February 5, 2014
PubMed
Summary
This summary is machine-generated.

Hyponatremia, low sodium levels, is typically caused by excess body water, not sodium deficiency. Treatment focuses on managing free water and correcting sodium levels cautiously to prevent neurological damage.

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Area of Science:

  • Endocrinology and Metabolism
  • Nephrology
  • Neurology

Context:

  • Hyponatremia is a common electrolyte disorder defined by plasma sodium concentration below 135 mmol/L.
  • It often results from free water retention due to vasopressin hypersecretion, leading to hypoosmolality.
  • Various conditions like SIADH, heart failure, and drug reactions can precipitate hyponatremia.

Purpose:

  • To define hyponatremia and elucidate its underlying pathophysiology.
  • To outline the diverse etiologies of hyponatremia.
  • To describe the neurological manifestations and therapeutic strategies.

Summary:

  • Hyponatremia signifies low plasma sodium, typically due to water retention from vasopressin issues, not true sodium loss.
  • Neurological symptoms arise from cerebral edema, influenced by the speed and severity of sodium decline.
  • Treatment involves free water elimination, volume expansion, water restriction, or hormone replacement, with careful attention to correction rates.

Impact:

  • Highlights the importance of identifying the underlying cause of hyponatremia for effective management.
  • Emphasizes the critical need for controlled sodium correction rates to prevent osmotic demyelination syndrome.
  • Provides a concise overview for clinicians managing patients with hyponatremia and its associated neurological risks.