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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,...
857
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...
590
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

3.5K
Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
3.5K
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
2.7K
The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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Related Experiment Video

Updated: Feb 8, 2026

Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding
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Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding

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[Severe cardiac arrhythmias].

S Robinet1, Casteren L Van1, A Delcour1

  • 1Service de Cardiologie, CHU Sart Tilman, Liège, Belgique.

Revue Medicale De Liege
|June 22, 2018
PubMed
Summary
This summary is machine-generated.

Cardiac arrhythmias, including severe atrio-ventricular and ventricular types, necessitate prompt emergency care. Understanding their causes and pathophysiology is crucial for effective acute and chronic management by physicians.

Keywords:
Torsade de pointeVentricular fibrillationVentricular tachycardiaWolffAtrioParkinsonWhite syndromeventricular conductive disorders

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Area of Science:

  • Cardiology
  • Emergency Medicine
  • Clinical Electrophysiology

Background:

  • Cardiac arrhythmias are a frequent reason for emergency department visits.
  • Atrio-ventricular conductive disorders and malignant ventricular arrhythmias represent severe conditions.
  • Effective management hinges on understanding the underlying pathophysiology and etiology.

Purpose of the Study:

  • To emphasize the critical need for knowledge of arrhythmia pathophysiology and etiology.
  • To highlight the importance of prompt and appropriate management for severe arrhythmias.
  • To improve communication between emergency physicians and cardiologists regarding arrhythmia care.

Main Methods:

  • This abstract does not detail specific methods.
  • Focuses on the importance of etiological and pathophysiological understanding.
  • Literature review and clinical knowledge synthesis are implied.

Main Results:

  • Severe arrhythmias require immediate and precise medical intervention.
  • Comprehensive knowledge of causes and mechanisms is essential for optimal patient outcomes.
  • Enhanced physician dialogue can improve arrhythmia management.

Conclusions:

  • Understanding arrhythmia pathophysiology and etiology is mandatory for effective treatment.
  • Prompt management in emergency settings is vital for severe cardiac arrhythmias.
  • Facilitating communication between emergency physicians and cardiologists improves patient prognosis.