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Related Concept Videos

Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Disturbances in Heart Rhythm01:29

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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.
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Autonomic Nervous System01:22

Autonomic Nervous System

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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
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Dysrhythmias I: Introduction01:15

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Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
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Mechanism of Cardiac Arrhythmias01:28

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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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...
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Related Experiment Video

Updated: Nov 15, 2025

Generation and On-Demand Initiation of Acute Ictal Activity in Rodent and Human Tissue
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Interictal autonomic dysfunction.

Shobi Sivathamboo1,2,3, Piero Perucca1,2,3

  • 1Department of Neuroscience, Central Clinical School, Monash University.

Current Opinion in Neurology
|March 5, 2021
PubMed
Summary
This summary is machine-generated.

Patients with epilepsy show altered autonomic function, including heart rate variability (HRV), baroreflex sensitivity (BRS), and electrodermal activity (EDA). These changes may link to increased mortality risk in epilepsy.

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Area of Science:

  • Neurology
  • Autonomic Neuroscience

Background:

  • Epilepsy is frequently accompanied by autonomic dysfunction.
  • Autonomic nervous system alterations are increasingly recognized as a significant comorbidity in epilepsy.

Purpose of the Study:

  • To review current measures of interictal autonomic function in epilepsy.
  • Focus on heart rate variability (HRV), baroreflex sensitivity (BRS), and electrodermal activity (EDA).

Main Methods:

  • Systematic review of studies measuring interictal autonomic function in epilepsy patients.
  • Analysis of data on HRV, BRS, and EDA in various epilepsy types.

Main Results:

  • Patients with epilepsy exhibit altered resting HRV, BRS, and EDA compared to controls.
  • HRV derangements are widespread across epilepsy types, most prominent in temporal lobe epilepsy, Dravet syndrome, and drug-resistant epilepsy.
  • Conflicting data exist on antiseizure medications' effects; carbamazepine may decrease HRV.

Conclusions:

  • Epilepsy patients, especially those with uncontrolled seizures, have measurable autonomic function alterations.
  • These autonomic changes may contribute to the elevated risk of premature mortality, including sudden unexpected death in epilepsy (SUDEP).