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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 the T...

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...

Bode Plots Construction

Bode Plots Construction

The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):

Pulse rhythm

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...

Instrumentation Amplifier

Instrumentation Amplifier

An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...

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...

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Related Experiment Video

Updated: Jun 6, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

A capacitive ECG array with visual patient feedback.

Benjamin Eilebrecht¹, Antje Schommartz, Marian Walter

¹RWTH Aachen University, Philips Chair of Medical Information Technology, Germany. eilebrecht@hia.rwth-aachen.de

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|November 25, 2010

Summary

This summary is machine-generated.

Capacitive electrocardiogram (ECG) sensing offers less restrictive vital sign monitoring. This study introduces a multi-channel capacitive ECG system using nine electrodes to record standard ECG leads, enhancing diagnostic capabilities beyond heart rate changes.

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Area of Science:

Biomedical Engineering
Medical Devices
Signal Processing

Background:

Capacitive electrocardiogram (ECG) sensing enables less constraining vital signal measurement.
Current research predominantly uses single-channel systems, limiting diagnostic relevance to heart rate-dependent conditions.
There is a growing need for multi-channel capacitive ECGs to improve diagnostic accuracy.

Purpose of the Study:

To introduce a novel capacitive ECG measurement system.
To enable the recording of standardized ECG leads (Einthoven and Goldberger).
To overcome the limitations of single-channel capacitive ECG systems.

Main Methods:

Development of a capacitive ECG measurement system.
Implementation of an electrode array with nine electrodes.
Recording of standardized ECG leads.

Main Results:

The developed system successfully records standardized ECG leads.
The multi-channel approach expands diagnostic potential beyond heart rate monitoring.
Demonstration of a viable capacitive multi-channel ECG system.

Conclusions:

The introduced capacitive ECG system addresses the need for multi-channel monitoring.
This technology enhances diagnostic capabilities by enabling comprehensive ECG lead recordings.
The system represents a significant advancement towards practical, multi-channel capacitive ECG applications.