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Related Concept Videos

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...
ECG Interpretation of Rhythms01:24

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 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...
Correlation between ECG and Cardiac Cycle01:25

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...
Pulse rhythm01:30

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...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...

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Updated: May 7, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
05:03

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

Published on: December 11, 2019

A drop dead healthy ECG.

Ross MacKenzie1

  • 1Ross MacKenzie Consulting, 2261 Constance Drive, Oakville, Ontario L6J 5L8, Canada. rossmackenzieconsulting@msn.com

Journal of Insurance Medicine (New York, N.Y.)
|September 28, 2013
PubMed
Summary
This summary is machine-generated.

Borderline electrocardiograms present a diagnostic challenge, potentially indicating normal variations or serious risks like sudden cardiac death. Understanding these ECG findings is crucial for accurate patient assessment and management.

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Published on: December 28, 2012

Area of Science:

  • Cardiology
  • Electrocardiography
  • Clinical Diagnostics

Background:

  • Electrocardiograms (ECGs) are fundamental in cardiac diagnostics.
  • Interpreting borderline ECG findings poses clinical challenges.
  • Distinguishing normal variants from pathological markers is critical.

Observation:

  • Borderline ECGs exhibit ambiguous patterns.
  • These patterns can mimic benign findings or serious cardiac conditions.
  • The clinical significance of such findings requires careful evaluation.

Findings:

  • The study explores the dual nature of borderline ECGs.
  • These interpretations range from normal physiological variants to indicators of significant cardiac risk.
  • Risk stratification is a key consideration.

Implications:

  • Accurate diagnosis of borderline ECGs impacts patient management.
  • Early identification of risk can prevent adverse cardiac events.
  • Improved understanding aids in preventing sudden cardiac death.