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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
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Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
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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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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

155
Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
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Updated: Oct 12, 2025

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Heart Rate Variability in Insulo-Opercular Epilepsy.

Thi Phuoc Yen Tran1, Philippe Pouliot2,3, Elie Bou Assi1

  • 1CHUM Research Center, University of Montreal, Montreal, QC H2X 0A9, Canada.

Brain Sciences
|November 27, 2021
PubMed
Summary
This summary is machine-generated.

Heart rate variability (HRV) in insulo-opercular epilepsy (IOE) patients did not differ from controls. Post-surgery, HRV changes varied, but no major autonomic dysfunction was found with good seizure control. Preoperative parasympathetic tone increase correlated with SUDEP-7 risk.

Keywords:
cardiac autonomic dysfunctionheart rate variabilityinsulo-opercular epilepsy

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Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Area of Science:

  • Neurology
  • Cardiology
  • Epilepsy Research

Background:

  • Insulo-opercular epilepsy (IOE) is a distinct epilepsy syndrome.
  • Autonomic dysfunction is a concern in epilepsy patients.
  • Heart rate variability (HRV) is a marker of autonomic function.

Purpose of the Study:

  • To evaluate changes in HRV in patients with insulo-opercular epilepsy (IOE).
  • To assess HRV before and after insulo-opercular epilepsy surgery.
  • To compare HRV in IOE patients with temporal lobe epilepsy (TLE) and healthy controls.

Main Methods:

  • Analysis of 5-minute resting HRV in IOE patients pre- and post-surgery.
  • Calculation of SUDEP-7 risk inventory scores for IOE patients.
  • Comparison of HRV data with age- and sex-matched TLE patients and healthy individuals.

Main Results:

  • No significant differences in HRV were observed between IOE, TLE, and healthy groups pre- or post-surgery.
  • In IOE patients, SUDEP-7 scores positively correlated with pNN50 and RMSSD.
  • IOE patients with lower preoperative RMSSD showed increased HRV post-surgery, while those with higher RMSSD showed decreased HRV.

Conclusions:

  • HRV in IOE may indicate decreased parasympathetic tone or global sympathetic/parasympathetic tone increase.
  • Insulo-opercular surgery did not result in major autonomic dysfunction with successful seizure control.
  • Preoperative increase in parasympathetic tone in IOE patients is a potential clinical concern due to its correlation with SUDEP-7 risk.