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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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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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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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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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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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Dysrhythmias V: Evaluating Dysrhythmias01:30

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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Related Experiment Video

Updated: May 5, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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[Abnormal filter setting or Brugada syndrome?].

Jan Ruta1, Janusz Kawiński, Paweł Ptaszyński

  • 1Klinika Elektrokardiologii, Uniwersytet Medyczny w Łodzi, Łódź. rutajan@interia.pl.

Kardiologia Polska
|December 4, 2013
PubMed
Summary
This summary is machine-generated.

Incorrect ECG filter settings can mimic Brugada syndrome (BrS) symptoms, leading to misdiagnosis. This case highlights the importance of verifying ECG parameters to avoid unnecessary interventions like ICD implantation.

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Area of Science:

  • Cardiology
  • Medical Diagnostics

Background:

  • Brugada syndrome (BrS) is a genetic disorder that affects the heart's electrical system.
  • Misdiagnosis of BrS can lead to unnecessary and invasive procedures.

Observation:

  • A 26-year-old patient presented with dizziness and ECG findings suggestive of BrS.
  • ECG recorded at a district hospital showed ST segment elevation, leading to consideration of ICD implantation.
  • Subsequent ECGs at our department, with correct filter settings, revealed sinus bradycardia and minimal ST elevation, excluding BrS.

Findings:

  • The ST segment elevation observed in the initial ECG was an artifact caused by incorrect filter settings (1.5 Hz high-pass filter).
  • Repeating the ECG with appropriate filter settings (0.05 Hz) and a negative ajmaline test confirmed the absence of BrS.
  • The misdiagnosis was attributed to the use of a high-frequency filter on the ECG machine.

Implications:

  • This case underscores the critical importance of standardized ECG recording protocols and filter settings in diagnosing cardiac conditions.
  • Healthcare providers must be vigilant about potential artifacts in ECG readings, especially when diagnosing conditions like Brugada syndrome.
  • Proper ECG parameter verification can prevent misdiagnosis and avoid unnecessary patient anxiety and medical interventions.