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Related Concept Videos

Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

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Related Experiment Video

Updated: Jun 27, 2026

Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit
11:37

Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit

Published on: August 2, 2017

Hippocampic theta rhythm.

E Niedermeyer1

  • 1Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Clinical EEG and Neuroscience
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

Rodents like rats exhibit a dominant theta rhythm in their electroencephalogram (EEG), primarily in the hippocampus, linked to arousal and cholinergic activity. This brainwave pattern is less common in humans and primates.

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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG

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Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
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Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

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Related Experiment Videos

Last Updated: Jun 27, 2026

Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit
11:37

Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit

Published on: August 2, 2017

Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
09:35

Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG

Published on: March 10, 2017

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
07:33

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Published on: June 29, 2018

Area of Science:

  • Neuroscience
  • Electroencephalography (EEG)
  • Comparative Neuroanatomy

Background:

  • A prominent theta rhythm characterizes the electroencephalogram (EEG) of rodents, predominantly in the hippocampus.
  • This EEG activity is typically associated with arousal states and cholinergic mechanisms.
  • While well-studied in experimental neuroscience, hippocampal theta rhythm is less recognized in clinical electroencephalography.

Purpose of the Study:

  • To highlight the significance of hippocampal theta rhythm in rodents.
  • To contrast its prevalence across different species, including canines, felines, primates, and humans.
  • To underscore the relationship between olfactory memory, EEG patterns, and the neuropsychology of macrosmatic rodents.

Main Methods:

  • Analysis of electroencephalogram (EEG) data from various species.
  • Review of existing experimental neuroscience literature on theta rhythm.
  • Comparative study of brainwave patterns across rodents, canines, felines, primates, and humans.

Main Results:

  • Hippocampal theta rhythm is a dominant EEG feature in rodents (rabbits, rats, mice).
  • This rhythm is less pronounced in canines and felines and virtually absent in monkeys and humans.
  • The presence and characteristics of theta rhythm correlate with species-specific sensory processing, such as olfactory memory in rodents.

Conclusions:

  • The hippocampal theta rhythm serves as an objective indicator of rodent neuropsychology and their sensory world.
  • Significant interspecies variations in theta rhythm prevalence highlight distinct neural processing mechanisms.
  • Further research is warranted to bridge the gap between experimental and clinical understanding of EEG patterns across species.