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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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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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Critical Region, Critical Values and Significance Level01:16

Critical Region, Critical Values and Significance Level

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The critical region, critical value, and significance level are interdependent concepts crucial in hypothesis testing.
In hypothesis testing, a sample statistic is converted to a test statistic using z, t, or chi-square distribution. A critical region is an area under the curve in  probability distributions demarcated by the critical value. When the test statistic falls in this region, it suggests that the null hypothesis must be rejected. As this region contains all those values of the...
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Critical Values01:31

Critical Values

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A critical value is a definite value obtained from a particular probability distribution at a predecided confidence level (or a predecided significance level) for a given population parameter. The critical value provides demarcation that separates the sample statistics that are likely to occur from the ones that are unlikely to occur based on the given probability distribution and the population parameter to be estimated. The critical value for normal distribution is obtained from the z...
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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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Investigating the Immunological Mechanisms Underlying Organ Transplant Rejection
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Critical inflammatory mechanisms underlying arrhythmias.

N Vonderlin1, J Siebermair1, E Kaya1

  • 1Klinik für Angiologie und Kardiologie, Westdeutsches Herz- und Gefäßzentrum Essen, Universitätsklinikum der Universität Essen, Hufelandstr. 55, 45147, Essen, Germany.

Herz
|February 8, 2019
PubMed
Summary

Systemic inflammation is linked to cardiac arrhythmias like atrial fibrillation. Understanding these inflammatory pathways is crucial for developing new anti-inflammatory therapies for heart rhythm disorders.

Keywords:
AtherosclerosisAtrial fibrillationC-reactive proteinCardiac arrhythmogenesisCytokines

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Area of Science:

  • Cardiovascular Research
  • Cardiac Electrophysiology
  • Inflammation Biology

Background:

  • Cardiovascular research increasingly focuses on systemic inflammation's role in atherosclerosis and cardiac arrhythmias.
  • Objective inflammatory markers like C-reactive protein and cytokines predict the onset and prognosis of cardiac arrhythmias.
  • Atrial fibrillation, the most common sustained arrhythmia, is a key focus in this area.

Purpose of the Study:

  • To review potential mechanisms linking inflammatory processes and cardiac arrhythmias, particularly atrial fibrillation.
  • To explore novel concepts including coagulation and inflammation in cardiac tissue.
  • To highlight the complexity of inflammatory pathways in cardiac arrhythmia development.

Main Methods:

  • Review of current scientific literature on inflammation and cardiac arrhythmias.
  • Analysis of direct and indirect pathways connecting inflammatory processes to arrhythmia mechanisms.
  • Examination of altered electrophysiological properties and structural remodeling in cardiomyopathies.

Main Results:

  • Inflammation and coagulation are implicated in cardiac tissue, contributing to arrhythmias.
  • Mechanisms include altered ion channel function, afterdepolarizations, and fibrosis.
  • These factors promote ectopic pacemakers and re-entrant tachycardias.

Conclusions:

  • The association between inflammation and cardiac arrhythmia is complex, involving multiple pathways.
  • Further research is needed to elucidate inflammatory signal cascades and mediator effects.
  • Understanding these mechanisms may lead to future anti-inflammatory therapies for arrhythmias.