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Related Concept Videos

What is a Mode?01:07

What is a Mode?

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
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Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
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Full Support Modes
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Anatomical Movements00:51

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Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints.
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Intrinsically Disordered Proteins02:18

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Modes of Standing Waves - I01:03

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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Transcranial B-Mode Sonography in Movement Disorders.

Rezzak Yilmaz1, Daniela Berg2

  • 1Department of Neurology, Christian-Albrechts-University of Kiel, Kiel, Germany.

International Review of Neurobiology
|November 27, 2018
PubMed
Summary

Transcranial sonography (TCS) effectively diagnoses Parkinson's disease (PD) and other movement disorders. This accessible ultrasound method shows high accuracy and reliability, aiding differential diagnosis and risk assessment in PD patients.

Keywords:
Movement disordersParkinson's diseaseSubstantia nigra hyperechogenicityTranscranial sonography

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Area of Science:

  • Neurology
  • Medical Imaging
  • Neurodegenerative Diseases

Background:

  • Transcranial sonography (TCS) utilizes a 2-4MHz probe at the temporal bone window to visualize brain parenchyma through the intact skull.
  • TCS has a long-standing application in the diagnosis and differential diagnosis of movement disorders, including Parkinson's disease (PD).

Purpose of the Study:

  • To detail the technical requirements and methodology for optimal TCS examination of the brain.
  • To elucidate the role of substantia nigra hyperechogenicity in diagnosing Parkinson's disease (PD) and prodromal PD.
  • To explore the utility of TCS in differentiating various Parkinsonian syndromes and other movement disorders.

Main Methods:

  • Detailed explanation of imaging planes and relevant anatomical structures for TCS.
  • Focus on substantia nigra hyperechogenicity as a key diagnostic marker.
  • Review of existing data on TCS sensitivity, specificity, and inter-rater reliability for PD diagnosis.

Main Results:

  • TCS demonstrates high sensitivity (>85%) and specificity (>80%) for diagnosing PD.
  • Excellent inter-rater reliability (>84%) supports TCS as a dependable diagnostic tool.
  • TCS proves valuable in the differential diagnosis of movement disorders, including atypical and secondary Parkinsonism.

Conclusions:

  • Transcranial sonography is an easily applicable, economic imaging method for diagnosing PD and aiding differential diagnosis of movement disorders.
  • TCS shows promise in identifying individuals at risk for PD and guiding deep brain stimulation electrode placement.
  • Limitations include the need for an adequate temporal bone window and an experienced investigator.