Tachyarrhythmias
Tachyarrhythmias - Related Videos
01:28
Dysrhythmias II: Classification of Tachyarrhythmias
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2025
Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
08:33
Porcine Cardiac Arrest Model Using an Implantable Defibrillator
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2026
This protocol demonstrates the use of an implantable cardioverter-defibrillator (ICD) to reliably induce ventricular arrhythmias, perform internal cardioversion, and obtain intracardiac ECG recordings in a porcine model.
FAQs
These mechanisms accelerate cardiac electrical activity in different ways. Abnormal automaticity generates impulses without the usual control, triggered activity produces extra impulses, and reentry allows an impulse to circulate through a circuit and repeatedly reactivate tissue. Depending on where the disturbance occurs, the rapid rhythm may begin in the atria or ventricles and produce different clinical risks.
A fast rhythm shortens diastolic filling time, leaving less opportunity for the ventricles to fill before contraction. Reduced filling can lower the amount of blood pumped with each beat and may impair overall cardiac output. The clinical effect depends on the rhythm and the patient’s symptoms and hemodynamic stability, which help determine the urgency of treatment.
The location of abnormal impulse formation or conduction helps distinguish supraventricular rhythms from ventricular rhythms. Atrial disturbances include atrial fibrillation and atrial flutter, while ventricular tachycardia arises in the ventricles. Identifying the site is clinically important because electrocardiography uses the rhythm’s electrical pattern to support classification, risk assessment, and treatment selection.
Electrocardiography helps clinicians distinguish among supraventricular tachycardias, atrial fibrillation, atrial flutter, and ventricular tachycardia. This classification provides information about where the rhythm originates and supports risk assessment. The result helps connect the observed electrical pattern with an appropriate management approach rather than treating every rapid rhythm as the same condition.
Management is guided by the identified rhythm, the patient’s symptoms, and hemodynamic stability. Possible approaches include vagal maneuvers, antiarrhythmic drugs, synchronized cardioversion, or catheter ablation. Because these options serve different clinical situations, evaluation first focuses on recognizing the rhythm and determining how seriously the rapid rate is affecting cardiac function.
Synchronized cardioversion and catheter ablation are among the clinical options for managing tachyarrhythmias, but their use depends on the rhythm, symptoms, and hemodynamic stability. Cardioversion provides an electrical treatment option, whereas ablation is a procedural approach directed at the rhythm’s abnormal electrical source or pathway. Electrocardiographic classification helps determine which strategy is appropriate.