Ventricular arrhythmias

Jun 26, 2021 by in CARDIOLOGY Comments Off on Ventricular arrhythmias

Definitions Ventricular tachycardia (VT) is defined as a tachycardia (rate > 100 beats per minute [bpm]) with three or more consecutive beats that originates in the ventricles. , Accelerated idioventricular…

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Atrial tachycardias

Jun 26, 2021 by in CARDIOLOGY Comments Off on Atrial tachycardias

Atrial premature beats An atrial premature beat (APB) is characterized by a nonsinus P wave that occurs before the next anticipated sinus beat. Several electrocardiographic leads may be needed to…

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Atrioventricular junctional tachycardias

Jun 26, 2021 by in CARDIOLOGY Comments Off on Atrioventricular junctional tachycardias

Atrioventricular nodal reentrant tachycardia Definition Atrioventricular nodal reentrant tachycardia (AVNRT) denotes reentry in the area of the atrioventricular (AV) node. Several models have been proposed to explain the mechanism of…

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Atrial fibrillation

Jun 26, 2021 by in CARDIOLOGY Comments Off on Atrial fibrillation

Definitions and classification Atrial fibrillation (AF) is characterized by uncoordinated atrial activation without effective atrial contraction. On the electrocardiogram (ECG), AF is characterized by rapid oscillations or fibrillatory waves that…

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Differential diagnosis of wide-QRS (>120 ms) tachycardias

Jun 26, 2021 by in CARDIOLOGY Comments Off on Differential diagnosis of wide-QRS (>120 ms) tachycardias

Wide-QRS tachycardias can be ventricular tachycardia (VT), supraventricular tachycardia (SVT) conducting with bundle branch block (BBB) aberration or through a bystander accessory pathway (AP), or an AP-mediated tachycardia, with reported…

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Electroanatomic mapping and magnetic guidance systems

Jun 26, 2021 by in CARDIOLOGY Comments Off on Electroanatomic mapping and magnetic guidance systems

Electroanatomic mapping Theoretical considerations During conventional electrophysiology (EP) procedures, catheters are manually navigated with the use of single or bi-plane fluoroscopy. An inherent limitation of fluoroscopic navigation is that orientation…

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Physics of ablation

Jun 26, 2021 by in CARDIOLOGY Comments Off on Physics of ablation

Radiofrequency ablation Radiofrequency (RF) ablation induces tissue necrosis by heating the targeted tissue. Most cardiac ablation systems deliver RF energy between a unipolar platinum-iridium electrode at the tip of the…

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