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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...

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...

Effective Value of a Periodic Waveform

Effective Value of a Periodic Waveform

The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
The effective value of a periodic current represents the direct current (DC) that conveys the same average power to a resistor as the periodic current itself. This concept is crucial when assessing AC circuits. To determine the...

Phase-lead and Phase-lag Controllers

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...

Construction of Root Locus

Construction of Root Locus

The construction of a root locus involves several key steps to analyze and visualize the behavior of a system's poles with varying gain. The number of branches in the root locus equals the number of closed-loop poles and is symmetrical about the real axis.
For positive gain values, the root locus exists on the real axis to the left of an odd number of finite open-loop poles or zeros. The root locus starts at the open-loop poles and traces the paths of the closed-loop poles as the gain...

Construction of Frequency Distribution

Construction of Frequency Distribution

A frequency distribution table can be constructed using the steps given below.
First, make a table with two columns—one with the title of the data that needs to be organized, and the other column for frequency. [Draw a third column for tally marks if needed]. Then, take a look at the items given in the data set and decide if an ungrouped frequency distribution table or a grouped frequency distribution table would be more suitable. If there are large sets of different values, then it is...

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Related Experiment Video

Updated: Feb 6, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

Construction of an Electrocardiogram Database Including 12 Lead Waveforms.

Dahee Chung¹, Junggu Choi¹, Jong-Hwan Jang¹

¹Department of Biomedical Informatics, Ajou University School of Medicine, Suwon, Korea.

Healthcare Informatics Research

|August 16, 2018

Summary

A large database of electrocardiogram (ECG) parameters and 12-lead waveforms has been updated, providing valuable data for cardiovascular disease and drug reaction research.

Keywords:

Adverse Drug Reaction Database Electrocardiogram QT Interval Waveform

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The ITS2 Database

The ITS2 Database

Published on: March 12, 2012

Related Experiment Videos

Last Updated: Feb 6, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

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

The ITS2 Database

The ITS2 Database

Published on: March 12, 2012

Area of Science:

Cardiology
Biomedical Informatics
Data Science

Background:

Electrocardiogram (ECG) data are crucial for studying cardiovascular diseases and drug reactions.
Existing analytical techniques like machine learning require accessible ECG datasets for research.
A previously developed ECG database (ECG-ViEW) has been enhanced with 12-lead waveform information.

Observation:

A comprehensive database was created by collecting 1,039,550 ECGs from 447,445 patients over 23 years.
Custom software extracted ECG parameters and 12-lead waveforms from PDF reports.
Clinical data, including demographics, drug exposure, diagnoses, and lab results, were integrated.

Findings:

The database contains detailed ECG parameters (rate, intervals, axes, interpretations) and all 12-lead waveforms.
Waveform data includes leads I, II, III, aVR, aVL, aVF, V1-V6.
Linked clinical data provides a rich resource for multi-faceted analysis.

Implications:

This enhanced ECG database provides a valuable resource for cardiovascular research and drug safety studies.
The methodology and code can guide other institutions in building similar research databases.
Facilitates advanced analysis of ECG data, potentially leading to new clinical insights.