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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

5.2K
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...
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Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

1.7K
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...
1.7K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.3K
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...
1.3K
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

11.4K
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...
11.4K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

11.8K
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....
11.8K
Pulse rhythm01:30

Pulse rhythm

1.3K
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...
1.3K

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Related Experiment Video

Updated: Jan 4, 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

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How useful is the smartwatch ECG?

Nino Isakadze1, Seth S Martin2

  • 1Department of Medicine, Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.

Trends in Cardiovascular Medicine
|November 11, 2019
PubMed
Summary
This summary is machine-generated.

The Apple Watch

Keywords:
Apple WatchAtrial fibrillationiECGmHealth

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Area of Science:

  • Cardiology
  • Digital Health
  • Medical Devices

Background:

  • Consumer wearables like the Apple Watch now offer electrocardiogram (ECG) capabilities.
  • These devices can detect atrial fibrillation (AF), a common heart rhythm disorder.
  • Regulatory bodies have cleared algorithms for AF detection in these devices.

Purpose of the Study:

  • To explore the clinical integration of consumer-generated ECG data.
  • To address challenges and potential benefits of wearable ECG technology in patient care.
  • To review existing literature and upcoming trials on smartwatch ECG applications.

Main Methods:

  • Discussion of the Apple Watch ECG feature and its FDA clearance.
  • Review of literature on AliveCor's Kardia mobile and smartwatch ECG technology.
  • Examination of Apple Heart Study and irregular heartbeat notifications.

Main Results:

  • The Apple Watch ECG feature assists in self-diagnosis of atrial fibrillation (AF).
  • The device's algorithm for AF detection has received FDA clearance.
  • Questions remain about optimal clinical integration, patient impact, and public health benefits.

Conclusions:

  • Wearable ECG devices present new opportunities and challenges for healthcare.
  • Further research and clinical trials are needed to establish the value of consumer ECG data.
  • Safety, security, and data utilization are key considerations for widespread adoption.