Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

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.
Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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...
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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Inherited genetic risk in stillbirth: A shared genomic segments analysis of high-risk pedigrees.

HGG advances·2025
Same author

Practice Patterns, Diagnostic Utility, and Safety of Anterior Chamber Paracentesis.

American journal of ophthalmology·2025
Same author

Insights into scleral violaceous hue in anterior scleritis: anterior segment optical coherence tomography evaluation.

Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie·2025
Same author

Factors Contributing to Uptake of Stillbirth Evaluations: A Qualitative Analysis.

BJOG : an international journal of obstetrics and gynaecology·2024
Same author

Sodium-Glucose Co-Transporter-2 (SGLT2) Inhibitor-Related Euglycemic Diabetic Ketoacidosis: A Case Series.

Journal of pharmacy practice·2024
Same author

Gonorrhea and Chlamydia Opt-Out Screening of Justice-Involved Women During Intake at the Los Angeles County Jail: The Pivotal Role of Correctional Health Systems.

Sexually transmitted diseases·2024
Same journal

Climate Change and Emergency Medicine: A Scoping Review Across Emergency Medicine Subspecialties.

The western journal of emergency medicine·2026
Same journal

Clinician-documented Firearm Access and Safety Interventions for Veterans Receiving Suicide Risk Evaluation in VA Emergency Care Settings.

The western journal of emergency medicine·2026
Same journal

Clinical Insights and Case Analysis of Disorders Attributed to Cicadas in the Emergency Department.

The western journal of emergency medicine·2026
Same journal

Worth the Wait? Comparison of Emergency Department Patients' Waiting Room Tolerance for Real Patient Care vs Training/Simulation Scenarios.

The western journal of emergency medicine·2026
Same journal

Pilot Simulation Task Trainer for Prehospital Management of Neck Hemorrhage.

The western journal of emergency medicine·2026
Same journal

Changes in THC Positivity Rates in Adolescents Corresponding to Legalization of Recreational Marijuana in Illinois.

The western journal of emergency medicine·2026
See all related articles

Related Experiment Video

Updated: May 14, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Electrocardiogram changes in Thyrotoxic Periodic Paralysis.

Sarah Lopez1, Sean O Henderson

  • 1Los Angeles County USC Medical Center, USC Keck School of Medicine, Department of Emergency Medicine, Los Angeles, California.

The Western Journal of Emergency Medicine
|January 30, 2013
PubMed
Summary
This summary is machine-generated.

Thyrotoxic periodic paralysis (TPP) causes sudden muscle weakness and low potassium (hypokalemia). This case study tracks a patient

More Related Videos

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

Electrocardiogram Recordings in Anesthetized Mice using Lead II
04:16

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

Related Experiment Videos

Last Updated: May 14, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

Electrocardiogram Recordings in Anesthetized Mice using Lead II
04:16

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

Area of Science:

  • Endocrinology
  • Neurology
  • Cardiology

Background:

  • Thyrotoxic periodic paralysis (TPP) presents as recurrent episodes of muscle weakness.
  • Attacks are associated with hypokalemia, a critical condition that can cause dangerous heart arrhythmias.
  • Understanding the relationship between potassium levels, paralysis, and cardiac function is crucial for patient management.

Purpose of the Study:

  • To present a case study detailing the management of thyrotoxic periodic paralysis (TPP).
  • To analyze the correlation between a patient's potassium levels and electrocardiogram (ECG) changes during treatment.
  • To illustrate the progression from hypokalemia to paralysis and its resolution.

Main Methods:

  • Case study methodology.
  • Continuous monitoring of patient's potassium levels.
  • Serial electrocardiogram (ECG) analysis.
  • Observation of response to hypokalemia treatment.

Main Results:

  • Documented fluctuations in serum potassium levels during TPP episodes.
  • Observed specific electrocardiogram (ECG) changes corresponding to hypokalemia.
  • Demonstrated the resolution of paralysis upon correction of potassium levels.

Conclusions:

  • TPP management requires careful monitoring of potassium levels.
  • ECG monitoring is essential to detect and manage potential cardiac complications.
  • Prompt treatment of hypokalemia is key to resolving paralysis and preventing arrhythmias in TPP patients.