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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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Mechanism of Cardiac Arrhythmias01:28

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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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Cardiac Action Potential01:30

Cardiac Action Potential

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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
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Disturbances in Heart Rhythm01:29

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Hyperkalemia induced Brugada phenocopy.

Janaki Rami Reddy Manne1, Jalaj Garg1

  • 1Division of Cardiology Cardiac Arrhythmia Service Medical College of Wisconsin Milwaukee WI USA.

Journal of Arrhythmia
|March 5, 2021
PubMed
Summary
This summary is machine-generated.

Hyperkalemia can mimic Brugada Type 1 pattern on ECG. These electrocardiogram changes are reversible after normalizing potassium levels, highlighting the need to rule out reversible causes before diagnosing Brugada syndrome.

Keywords:
brugada phenocopyhyperkalemia

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Area of Science:

  • Cardiology
  • Internal Medicine
  • Electrophysiology

Background:

  • Brugada syndrome is a genetic disorder associated with increased risk of sudden cardiac death.
  • Brugada Type 1 pattern on electrocardiogram (ECG) is a diagnostic criterion for Brugada syndrome.
  • Hyperkalemia, a condition of elevated serum potassium, can cause various ECG abnormalities.

Purpose of the Study:

  • To report a case where hyperkalemia mimicked the Brugada Type 1 pattern on ECG.
  • To emphasize the importance of considering and ruling out reversible causes of ECG abnormalities.
  • To highlight the diagnostic challenge in differentiating Brugada Type 1 pattern from other causes.

Main Methods:

  • Case report presentation.
  • Electrocardiogram (ECG) analysis.
  • Monitoring of serum potassium levels and clinical correlation.

Main Results:

  • A patient presented with ECG findings consistent with Brugada Type 1 pattern.
  • Serum potassium levels were found to be elevated (hyperkalemia).
  • Normalization of serum potassium levels led to the reversal of the Brugada Type 1 pattern on ECG.

Conclusions:

  • Hyperkalemia can present as a Brugada Type 1 pattern on ECG, mimicking the syndrome.
  • Prompt identification and management of reversible causes like hyperkalemia are crucial.
  • This case underscores the necessity of excluding alternative pathologies before diagnosing Brugada syndrome to prevent unnecessary interventions.