Fusion beat in patients with heart failure treated with left ventricular pacing: may ECG mor- phology relate to mechanical synchrony? A pilot study. Cardiovasc Ultrasound 2008;6:1.Lorella Gianfranchi et al., “Fusion beat in patients with heart failure treated with left ventricular pacing: may ...
When every other beat on the ECG is a premature ventricular complex (PVC), the rhythm is referred to as PVC in bigeminy (Figure 3). If every third beat is a PVC, it is referred to as PVC in trigeminy. Similarly, there can be quadrigeminy and so on. Figure 3. Premature ventricular...
A fusion beat — also known asDressler’s beat— occurs when sinus node activity (P wave) begins to conduct through the normal conduction pathway during an episode of VT. The abnormal ventricular impulse then conducts retrograde (backward) across the atrioventricular node, colliding w...
Electrical storm: Follow ACLS, start antiarrhythmic infusion (e.g., amiodarone, beta blockers), and admit to critical care unit. Stable patients: Treat based on likelihood of VT vs. SVT with aberrancy, using clinical evaluation and ECG findings, e.g., Brugada criteria. VT likely: Attempt...
An ECG taken when the pacemaker was programmed to the VVI mode showed ventricular paced beats with a dominant R wave in leads V1 to V3 and right axis deviation in the frontal plane. There was a ventricular fusion beat in leads V4 to V6. A transesophgeal echocardiogram confirmed the ...
Fusion beat Simultaneous activation of the ventricle by 2 sources can lead to a beat with characteristics between the conducted sinus beat and the ectopic beat. Premature junctional contractions The origin of this arrhythmia is automaticity or reentry in AV junctional tissues. The P waves usually ar...
This train is followed by a single ventricular premature beat (VPB) delivered from a catheter in right ventricle, which terminates the tachycardia. On the 12 lead ECG, the single paced beat is seen as a fusion beat as it has some resemblance to a paced ventricular beat and some to the ...
ECG features of monomorphic VT Regular, broad complex tachycardia Uniform QRS complexes within each lead — each QRS is identical (except for fusion/capture beats) Monomorphic VT:Regular, broad complex tachycardia Monomorphic VT can be difficult to differentiate from other causes of broad complex tachy...
The QRS duration of paced ventricular events is monitored, and analyzed to determine if the paced ventricular event is a fusion beat with an intrinsic ventricular depolarization. If fusion beat frequency criteria established for the patient are met, then the AV delay is shortened incrementally so ...
resulting in a pseudo-fusion beat (not shown). This operation is intended to prevent the onset of a ventricular tachycardia, should the ventricular pacing pulse fall into the relative refractory period of the ventricle, commonly called “pacing on T” phenomenon. In this respect, the reader is...