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Related Concept Videos

Bode Plots Construction01:24

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):
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...
Electrocardiogram Fundamentals01:28

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...
Impedances and Admittance01:23

Impedances and Admittance

In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
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...
Instrumentation Amplifier01:25

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...

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Related Experiment Video

Updated: Jul 14, 2026

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates
08:25

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates

Published on: April 4, 2020

Impedance cardiography: more questions than answers.

David J Wang1, Stephen S Gottlieb

  • 1Division of Cardiology, University of Maryland School of Medicine, MD 21201, USA.

Current Cardiology Reports
|June 5, 2007
PubMed
Summary

Thoracic electrical bioimpedance, or impedance cardiography (ICG), offers noninvasive hemodynamic monitoring. However, current ICG devices show poor correlation with invasive cardiac output measurements, limiting clinical utility.

Area of Science:

  • Cardiovascular Physiology
  • Medical Device Technology

Background:

  • Thoracic electrical bioimpedance, impedance cardiography (ICG), is a noninvasive technique for hemodynamic measurements.
  • Recent literature highlights proposed clinical applications of ICG, including heart failure diagnosis and management.

Purpose of the Study:

  • To evaluate the clinical utility and accuracy of current impedance cardiography (ICG) devices for hemodynamic monitoring.

Main Methods:

  • Review of existing data and clinical reports on impedance cardiography (ICG) device performance.
  • Comparison of ICG-derived cardiac output measurements with invasive methods, particularly in heart failure patients.

Main Results:

  • Current generation ICG devices demonstrate poor correlation with invasive cardiac output measurements, especially in heart failure.

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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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  • ICG is not accurate for measuring left ventricular filling pressures.
  • Limited evidence supports improved clinical outcomes with ICG use.

    • Conclusions:

    • The accuracy and clinical benefit of impedance cardiography (ICG) in patient care remain questionable.
    • ICG's current application should be restricted to research settings due to insufficient clinical validation and outcome data.