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Related Concept Videos

Increased pulse rate01:17

Increased pulse rate

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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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Decreased pulse rate01:14

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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Adrenal Gland Disorders

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Adrenal gland disorders manifest when the production of adrenal hormones deviates from the norm, resulting in either excessive or insufficient concentrations.
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Reflex Activity

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A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
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Updated: Jun 17, 2025

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The ADNI PET Core at 20.

William J Jagust1, Robert A Koeppe2, Gil D Rabinovici3

  • 1Department of Neuroscience, University of California, Berkeley, California, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|August 7, 2024
PubMed
Summary

The Alzheimer's Disease Neuroimaging Initiative (ADNI) PET Core evolved from basic glucose imaging to advanced amyloid and tau tracers. This progression has been crucial for understanding Alzheimer's disease and advancing clinical trials.

Keywords:
ADNIAlzheimer's Disease BiomarkersAlzheimer's diseasePETimaging

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Area of Science:

  • Neuroimaging
  • Alzheimer's Disease Research
  • Positron Emission Tomography

Background:

  • The Alzheimer's Disease Neuroimaging Initiative (ADNI) PET Core has progressively incorporated advanced imaging techniques.
  • Initial studies focused on [18F]fluorodeoxyglucose (FDG)-PET, later expanding to include tracers for β-amyloid and tau pathologies.

Purpose of the Study:

  • To review the evolution of the ADNI PET Core's capabilities.
  • To highlight novel aspects of PET imaging across ADNI phases.
  • To provide an inventory of available PET imaging data in the ADNI database.

Main Methods:

  • The ADNI PET Core has standardized acquisition and analysis protocols for multitracer PET imaging.
  • Methods were developed to ensure feasibility across different PET scanners and multiple tracers in multi-center studies.

Main Results:

  • The ADNI PET Core now offers data for FDG-PET, three amyloid tracers, and three tau tracers.
  • Standardized methods have enabled large-scale, multi-center PET studies.
  • Disseminated data has been vital for Alzheimer's disease pathophysiological models and therapeutic trial methodologies.

Conclusions:

  • The ADNI PET Core is an invaluable resource for quantitative PET data, supporting basic and clinical research in Alzheimer's disease.
  • The Core's standardization efforts have facilitated modern Alzheimer's disease clinical trials.