Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Electrocardiogram

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...

ECG Interpretation of Rhythms

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...

Electrocardiogram Fundamentals

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...

Correlation between ECG and Cardiac Cycle

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...

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

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...

Cardiac Action Potential

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

You might also read

Related Articles

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

Sort by

Same author

The effect of IL-1 blockers on exertional leg pain in familial Mediterranean fever patients: an exploratory study.

Rheumatology (Oxford, England)·2026

Same author

A single dose of anakinra for arresting familial Mediterranean fever attacks: a proof-of-concept study.

Clinical and experimental rheumatology·2025

Same author

Non-canonical manifestations of FMF in homozygous M694V MEFV genotype: Insights from a large patient cohort.

Seminars in arthritis and rheumatism·2025

Same author

Renal outcomes and survival in amyloidosis associated with familial Mediterranean fever: A longitudinal study.

Seminars in arthritis and rheumatism·2025

Same author

Neuro-Ophthalmologic Variability in Presentation of Genetically Confirmed Wolfram Syndrome: A Case Series and Review.

Brain sciences·2023

Same author

Diagnostic Challenges and Solutions in Systemic Amyloidosis.

International journal of molecular sciences·2023

Same journal

[Tennis Elbow Among Players].

Harefuah·2026

Same journal

[Internal Medicine - My Mission].

Harefuah·2026

Same journal

[Treatment of Morbid Obesity in Israel: GLP-1 Agonists Versus Bariatric Surgery - Clinical and Economic Aspects].

Harefuah·2026

Same journal

[Baby steps: Post-operative Treatment Recommendations for Pediatric Tracheostomy in Israel].

Harefuah·2026

Same journal

[Mastoiditis Caused by Fusobacterium Necrophorum: an Unusual Pathogen in a Well-Known Disease].

Harefuah·2026

Same journal

[Cochlear Implantation in Single-Sided Deafness - Six Years of Follow-Up from Diagnosis and Consistent Use, Through Dedicated and Creative Auditory Learning, to the Development of Bilateral Central Processing Abilities].

Harefuah·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Jul 2, 2026

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

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

[ECG changes during stroke].

Shani Golan¹, Avi Livneh

¹Department of Medicine F, Sheba Medical Center, Tel Hashomer, Israel.

|August 13, 2008

Summary

This summary is machine-generated.

Electrocardiogram (ECG) changes, like T wave inversion, can occur in stroke patients due to catecholamine release. These changes mimic cardiac ischemia, complicating diagnosis.

More Related Videos

Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

Published on: November 24, 2016

Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke

Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke

Published on: July 14, 2023

Related Experiment Videos

Last Updated: Jul 2, 2026

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

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

Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography

Published on: November 24, 2016

Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke

Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke

Published on: July 14, 2023

Area of Science:

Neurology
Cardiology
Medical Diagnostics

Background:

Electrocardiogram (ECG) abnormalities are frequently observed in patients with acute stroke.
These ECG changes can mimic acute coronary syndrome, posing diagnostic challenges.

Observation:

A patient with right frontal brain infarction developed ischemic-like T wave inversion on ECG.
The patient denied chest pain and had normal troponin levels, ruling out acute myocardial infarction.

Findings:

Literature suggests up to 30% of stroke patients exhibit various ECG changes.
These changes are attributed to catecholamine-induced myocardial injury, not coronary ischemia.

Implications:

ECG changes in stroke patients can lead to misdiagnosis of cardiac events.
Further research is needed to clarify the clinical significance and management of these neurogenic ECG abnormalities.