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Related Concept Videos

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

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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,...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Interpreting R Charts01:22

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R chart, or range chart, is a fundamental tool in statistical process control used to monitor the variability within a process. It complements the X-bar (x̄) chart by focusing on the range of the data, rather than individual values, providing a clear picture of the process dispersion over time.
An R chart plots the range of subsets of measurements collected from a process. Each point on the chart represents the range—defined as the difference between the maximum and minimum...
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Run charts, essentially line graphs plotted over time, serve as fundamental yet effective tools for process analysis. They chronicle data sequentially, facilitating the identification of trends, shifts, or cyclical movements. This graphical representation is instrumental in determining whether a process is stable or exhibits signs of potential instability indicative of special cause variation. In the healthcare domain, run charts depict infection rates over time, enabling hospitals to monitor...
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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...
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Related Experiment Video

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Psychophysiological Stress Assessment Using Biofeedback
10:16

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Published on: July 31, 2009

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Can you interpret the ECG under stress?

Ching-Hui Sia1, Devinder Singh1,2, Joshua Ping-Yun Loh1,2

  • 1Department of Cardiology, National University Heart Centre Singapore, Singapore.

Singapore Medical Journal
|October 13, 2018
PubMed
Summary

Stress cardiomyopathy (SC) causes temporary heart muscle dysfunction, often from high catecholamine levels. Electrocardiogram (ECG) findings can resemble heart attacks, as seen in two presented cases.

Keywords:
ST elevationT wave inversionTakotsuboelectrocardiographystress cardiomyopathy

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Area of Science:

  • Cardiology
  • Internal Medicine
  • Medical Diagnostics

Background:

  • Stress cardiomyopathy (SC), also known as Takotsubo cardiomyopathy, is a distinct clinical entity.
  • It is characterized by transient left ventricular dysfunction.
  • SC is frequently triggered by a surge in catecholamine levels, often associated with severe emotional or physical stress.

Observation:

  • This case series presents two patients diagnosed with stress cardiomyopathy.
  • The electrocardiographic (ECG) features observed in these patients are highlighted.
  • These ECG findings can be mistaken for acute myocardial infarction.

Findings:

  • The study reviews the characteristic electrocardiographic patterns associated with stress cardiomyopathy.
  • Diagnostic challenges arise due to the ECG mimicry of other cardiac conditions.
  • Understanding these ECG nuances is crucial for accurate diagnosis.

Implications:

  • Accurate diagnosis of SC is essential to avoid unnecessary invasive procedures.
  • Recognizing SC's ECG features can lead to timely and appropriate management.
  • Further research into SC pathophysiology and diagnostic markers is warranted.