Ventricular Fusion Beats

  title={Ventricular Fusion Beats},
  author={Henry J. L. Marriott and N. L. Schwartz and Harold H. Bix},
Relatively precise criteria are proposed for the recognition of ventricular fusion beats. Apart from the obvious and widely accepted criteria involving contour, duration, and time of appearance, other less obvious characteristics have been adduced: (1) the P-S time of the fusion beat must always be considerably longer than the P-R interval of the component sinoatrial beat; (2) the P-R interval of the fusion beat is generally not more than 0.06 second shorter than the sinoatrial P-R; (3) the… Expand
Atrioventricular Junctional Premature and Escape Beats with Altered QRS and Fusion
The interval between an ectopic QRS and a retrograde P wave measured in simultaneous esophageal and other leads may help to identify beats which originate in the atrio-ventricular (A-V) junction, and observations support the interpretation previously made by others that impulses of A-V junctional origin may reach the ventricles by pathways other than the usual A- V pathway. Expand
Some Interesting Properties of Cardiac Fusion Beats
Ventricular fusion beats are the result if the depolarizing wavefronts of excitations that originate from different sites collide within the ventricular functional syncitium. Fusions have been aExpand
Ventricular Fusion Beats during Electric Stimulation in Man: Application to Conduction Velocity and Anomalous AV Excitation
Quantitative studies of ventricular fusion beats were made in 40 patients with Stokes-Adams disease after implantation of electric pacemakers in the left ventricle. The two fusing complexes came fromExpand
Ventricular parasystole in acute myocardial infarction
It appears that this is a benign arrhythmia, easily controlled by treatment, produced perhaps by the same mechanisms as ventricular tachycardia, but with the existence of exit block. Expand
Implications of progressive aberrancy versus true fusion for diagnosis of wide complex tachycardia.
True fusion is the most common explanation for intermediate beats, but progressive aberrancy occurs a significant proportion of the time (29%) and the identified criteria will be helpful in differentiating ventricular tachycardia from supraventricular tachedcardia with aber Brancy as a cause of wide complex tachycardsia. Expand
Evaluation of normal and abnormal sensing functions of demand pacemakers.
Abstract The performance of demand (ventricular-inhibited) pacemakers may be evaluated by relatively simple techniques that greatly facilitate the interpretation of complex arrhythmias related toExpand
Multifocal ventricular parasystolic tachycardia.
It is concluded that multiple parasystole is probably not a very rare arrhythmia if long strips of simultaneously recorded multiple leads are available. Expand
Multifocal ventricular parasystolic tachycardia.
It is concluded that multiple parasystole is probably not a very rare arrhythmia if long strips of simultaneously recorded multiple leads are available. Expand
The Bix rule.
  • G. Nikolić
  • Medicine
  • Heart & lung : the journal of critical care
  • 2008
The patient was a 64-year-old man with a history of myocardial infarction and subsequent episodes of atrial fibrillation and sinus bradycardia, who had been taking sotalol 160 mg twice per day for maintenance of sinus rhythm. Expand
Comparison of ventricular parasystole with other dysrhythmias after acute myocardial infarction.
It is shown that ventricular parasystolic rhythms after acute myocardial infarction are probably benign in contrast to most other ventricular arrhythmias which are associated with an increased mortality. Expand


Fusion beats and their relation to the syndrome of short P-R interval associated with a prolonged QRS complex
Abstract Fusion ventricular complexes were produced in animals by a method which allows accurate spacing of stimuli over short time intervals in successive cardiac cycles. The time during whichExpand
Zones of potential interference, dissociation, and fusion: with observations on the contour of retrograde P waves.
It is suggested that the frequently observed absence of sinus P waves on the upstroke of the T wave of ventricular premature beats may be explained by the occurrence of atrial fusion beats at that time. Expand
The electrocardiographic patterns anid the localization of intraventricular conduction defects
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Different mechanismis of fusion beats
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ferent mechanismis of fusion beats
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Essentials of Electrocardiography. Ed
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