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...

Dysrhythmias V: Evaluating Dysrhythmias

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...

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...

Holter Monitor: 24-Hour Monitoring

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...

You might also read

Related Articles

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

Sort by

Same author

Reply: New Aspects of Vasospastic Angina: Coronary Adventitial and Perivascular Adipose Tissue Inflammation.

Journal of the American College of Cardiology·2018

Same author

Whole-brain low-intensity pulsed ultrasound therapy markedly improves cognitive dysfunctions in mouse models of dementia - Crucial roles of endothelial nitric oxide synthase.

Brain stimulation·2018

Same author

International Expert Consensus Document on Takotsubo Syndrome (Part II): Diagnostic Workup, Outcome, and Management.

European heart journal·2018

Same author

International Expert Consensus Document on Takotsubo Syndrome (Part I): Clinical Characteristics, Diagnostic Criteria, and Pathophysiology.

European heart journal·2018

Same author

Life-threatening Hyperkalemia Associated with Axitinib Treatment in Patients with Recurrent Renal Carcinoma.

Internal medicine (Tokyo, Japan)·2018

Same author

Clinical determinants of successful weaning from extracorporeal membrane oxygenation in patients with fulminant myocarditis.

ESC heart failure·2018

Search research articles

Related Experiment Video

Updated: May 9, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Published on: December 11, 2019

Evaluation of an electrocardiogram on QR code.

Masaharu Nakayama¹, Hiroaki Shimokawa

¹Medical Informatics Center, Tohoku University Hospital, Sendai, Japan.

Studies in Health Technology and Informatics

|August 8, 2013

Summary

This study presents a novel method for converting electrocardiogram (ECG) data into QR codes, enabling portable storage and retrieval. This innovation improves ECG data accessibility, even without a server connection, aiding cardiac diagnosis.

More Related Videos

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

In Vivo Surface Electrocardiography for Adult Zebrafish

In Vivo Surface Electrocardiography for Adult Zebrafish

Published on: August 1, 2019

Related Experiment Videos

Last Updated: May 9, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Published on: December 11, 2019

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

In Vivo Surface Electrocardiography for Adult Zebrafish

In Vivo Surface Electrocardiography for Adult Zebrafish

Published on: August 1, 2019

Area of Science:

Cardiology
Medical Informatics
Biomedical Engineering

Background:

Electrocardiograms (ECGs) are crucial for diagnosing and monitoring cardiac conditions like ischemic heart disease, myocarditis, arrhythmia, and cardiomyopathy.
Accurate diagnosis relies on comparing current ECGs with historical data, often requiring access to hospital ECG data servers.
Limited data connectivity between hospitals hinders the seamless transfer and comparison of vital ECG information.

Purpose of the Study:

To develop a portable and accessible method for storing and retrieving ECG data.
To enable ECG data utilization independent of hospital server connections.
To assess the usability and accuracy of a novel ECG data encoding system.

Main Methods:

ECG data was converted into text data and encoded into 2D QR codes.
A system was developed to decode QR codes and reconstruct ECGs using the Google Chart API.
The system was evaluated on iPhone and iPad devices by fourteen cardiologists and six general physicians.

Main Results:

The system successfully converted ECG data into QR codes for portability.
Decoded ECGs were accurately reconstructed and visualized using the Google Chart API.
Physicians expressed satisfaction with the system's usability and the accuracy of the decoded ECGs compared to original data.

Conclusions:

The developed QR code system offers a viable solution for portable ECG data storage and retrieval.
This technology enhances the accessibility of ECG data, overcoming limitations of server connectivity.
The system shows potential for improving the utilization of ECG data in clinical practice, irrespective of network availability.