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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

9.0K
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...
9.0K
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

16.4K
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...
16.4K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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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...
2.1K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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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....
19.9K
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

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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...
5.0K
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

488
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...
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Updated: Apr 14, 2026

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy
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Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy

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Electrocardiography: the ECG.

A D John1, Lee A Fleisher

  • 1Department of Anesthesia and Critical Care, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Baltimore, MD 21287-4904, USA. ajohn1@jhmi.edu

Anesthesiology Clinics
|March 9, 2007
PubMed
Summary
This summary is machine-generated.

Electrocardiography (ECG) is vital for monitoring patients during surgery, detecting critical changes like arrhythmias and ischemia. Systematic analysis of ECG elements, alongside hemodynamic data, ensures accurate patient assessment.

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Area of Science:

  • Cardiology
  • Anesthesiology
  • Medical Monitoring

Background:

  • Patient monitoring during operative procedures is crucial for timely intervention.
  • Electrocardiography (ECG) provides essential physiological data on cardiac electrical activity.

Purpose of the Study:

  • To examine the role and application of ECG in patient monitoring during surgery.
  • To highlight the importance of systematic ECG interpretation for detecting perioperative complications.

Main Methods:

  • Systematic analysis of ECG components: rate, rhythm, morphology, axis.
  • Identification of conduction abnormalities, electrolyte disturbances, and ischemic changes from ECG data.
  • Integration of ECG findings with hemodynamic information and cardiac-risk assessment.

Main Results:

  • ECG effectively monitors cardiac electrical activity during procedures.
  • ECG aids in the detection of critical events such as cardiac arrhythmias, electrolyte imbalances, and myocardial ischemia.
  • Comprehensive assessment requires integrating ECG data with other physiological parameters.

Conclusions:

  • ECG is an indispensable tool for intraoperative patient monitoring.
  • Systematic interpretation of ECG, combined with hemodynamic data, enhances patient safety and management during surgery.