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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

880
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...
880
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

122
Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
122
Decreased pulse rate01:14

Decreased pulse rate

621
Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
621
Electrocardiogram01:29

Electrocardiogram

3.2K
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...
3.2K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

420
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
420
Cardiac Action Potential01:30

Cardiac Action Potential

2.6K
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
2.6K

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Related Experiment Video

Updated: Sep 14, 2025

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
06:07

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

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Electrocardiogram essentials: Bradycardia.

Lloyd Tannenbaum1, Brit Long2

  • 1Department of Emergency Medicine, Geisinger Wyoming Valley Medical Center, Wilkes Barre, PA, USA.

The American Journal of Emergency Medicine
|July 19, 2025
PubMed
Summary
This summary is machine-generated.

Bradycardia, a slow heart rate, can range from asymptomatic to life-threatening. Prompt diagnosis and management, including ECG and pacing if unstable, are crucial for patient care.

Keywords:
AV blockArrhythmiaBlockBradyarrhythmiaBradycardiaCardiologyEpinephrineFirst degreeJunctionalMobitzPacingResuscitationSecond degreeThird degreeTranscutaneousTransvenous

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Area of Science:

  • Cardiology
  • Emergency Medicine

Background:

  • Bradycardia is a frequent emergency department finding.
  • It presents a spectrum from asymptomatic to cardiac arrest.

Purpose of the Study:

  • To evaluate bradycardia management strategies.
  • To discuss case studies for clinical insight.

Main Methods:

  • Case study analysis.
  • Review of bradycardia etiologies and associations.
  • Electrocardiogram (ECG) interpretation.

Main Results:

  • Bradycardia (heart rate <60 bpm) can cause severe hemodynamic compromise.
  • Causes are diverse: physiologic, pathologic, and pharmacologic.
  • ECG is vital for assessing severity and rhythm (e.g., AV blocks).

Conclusions:

  • Hemodynamically unstable patients need immediate resuscitation.
  • Treatment involves chronotropic agents and pacing.
  • Knowledge of emergent management optimizes patient outcomes.