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Related Concept Videos

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

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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...
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Cardiac Action Potential01:30

Cardiac Action Potential

1.4K
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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Electrocardiogram01:29

Electrocardiogram

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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...
2.3K
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

920
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.
920
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

4.3K
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

215
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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Related Experiment Video

Updated: Jul 2, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Brugada Phenocopy In Hyperkalaemia - A Rare Ecg Finding.

Nirdosh Kumar1, Fareed Ahmed1, Areeba Memon2

  • 1Department of Emergency Medicine, Aga Khan University Hospital, Karachi.

Journal of Ayub Medical College, Abbottabad : JAMC
|February 26, 2024
PubMed
Summary
This summary is machine-generated.

Severe hyperkalaemia can cause Brugada Phenocopy (BrP), a transient ECG change mimicking Brugada Syndrome. This rare finding in hyperkalaemia resolves with treatment, unlike true Brugada Syndrome.

Keywords:
Brugada Syndrome; Brugada Phenocopy; Hyperkalaemia; ECG; Emergency Department

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Area of Science:

  • Cardiology
  • Emergency Medicine
  • Clinical Electrophysiology

Background:

  • Hyperkalaemia is a critical condition frequently encountered in emergency departments.
  • Hyperkalaemia can induce various electrocardiogram (ECG) abnormalities, including peaked T-waves and widened QRS complexes.
  • Brugada Phenocopy (BrP) is a rare ECG pattern associated with severe hyperkalaemia, malignant arrhythmias, and increased mortality.

Observation:

  • This case report details a Brugada Phenocopy (BrP) identified in a middle-aged male patient.
  • The patient presented with severe hyperkalaemia, leading to the observed ECG changes.

Findings:

  • The Brugada Phenocopy (BrP) in this case was a transient ECG phenomenon.
  • The ECG abnormalities resolved completely upon normalization of the patient's potassium levels.
  • This observation highlights the distinct nature of BrP compared to Brugada Syndrome (BrS).

Implications:

  • Recognizing Brugada Phenocopy (BrP) is crucial for emergency physicians managing hyperkalaemia.
  • Prompt identification and treatment of hyperkalaemia can reverse potentially life-threatening ECG changes.
  • Distinguishing BrP from Brugada Syndrome (BrS) is essential for appropriate patient management and prognosis.