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Related Concept Videos

Lewis Acids and Bases02:33

Lewis Acids and Bases

48.3K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
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Lewis Acids and Bases02:16

Lewis Acids and Bases

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This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
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Lewis Symbols and the Octet Rule02:36

Lewis Symbols and the Octet Rule

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Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
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Dementia01:30

Dementia

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Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual....
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Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

61.1K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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Related Experiment Video

Updated: Jan 27, 2026

Using Retinal Imaging to Study Dementia
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Using Retinal Imaging to Study Dementia

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[Dementia with Lewy bodies].

Marc Verny1

  • 1Centre de gériatrie, pavillon M. Bottard et CMRR Paris-Sud,groupe hospitalier La Pitié-Salpêtrière, AP-HP, DHU FAST, Sorbonne-Université et UMR8256 (CNRS), Paris, France.

La Revue Du Praticien
|March 15, 2019
PubMed
Summary

Dementia with Lewy bodies (DLB) is a common cause of dementia in older adults, often misdiagnosed due to varied symptoms. This work aims to improve DLB diagnosis in primary care and outline patient care strategies.

Area of Science:

  • Neurology
  • Geriatrics
  • Internal Medicine

Background:

  • Dementia with Lewy bodies (DLB) is the second most common cause of dementia in the elderly.
  • Clinical presentation of DLB is highly variable, leading to frequent diagnostic challenges and low sensitivity in diagnosis.
  • Accurate diagnosis is crucial as it influences patient management and care.

Purpose of the Study:

  • To review the main characteristics of Dementia with Lewy bodies (DLB).
  • To facilitate the diagnosis of DLB in primary care settings.
  • To survey the essential principles of patient care for DLB.

Main Methods:

  • Literature review of DLB characteristics.
  • Analysis of diagnostic challenges in primary care.
  • Synthesis of current care principles for DLB patients.
Keywords:
Dementia with Lewy bodiesElderly

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Main Results:

  • DLB presents with diverse clinical signs, complicating early and accurate diagnosis.
  • Primary care physicians face significant hurdles in identifying DLB.
  • Understanding key features can enhance diagnostic accuracy.

Conclusions:

  • Improved awareness of DLB's varied manifestations is essential for primary care.
  • Simplified diagnostic approaches and clear care guidelines are needed.
  • Early and correct diagnosis of DLB can significantly improve patient outcomes and management.