257 results match your criteria ventricular parasystole

Timed RR-interval Scatter Plots and Reverse Technology.

Jin-Tao Xiang

Curr Med Sci 2020 Dec 11;40(6):1191-1202. Epub 2021 Jan 11.

Department of Cardiology, Remin Hospital, Wuhan University, Wuhan, 430060, China.

Lorenz-RR scatter plot has an obvious shortcoming in that it does not indicate the time when the scatter point happens. On the Lorenz RR scatter plot, one cannot know the time during which the cardiac rhythms take place. Since occurrence of cardiac rhythms is time-related, time should be introduced to such plots. Read More

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December 2020

Novel mapping algorithm during catheter ablation for ventricular parasystole originating from left anterior fascicle.

J Arrhythm 2020 Aug 6;36(4):777-779. Epub 2020 Jul 6.

Department of Cardiology Tokyo Metropolitan Hiroo Hospital Tokyo Japan.

A 17-year-old woman presented with frequent palpitations and shortness of breath and was diagnosed with drug-refractory ventricular parasystole. We predicted that the parasystole originated from the left anterior fascicle (LAF). Detailed activation maps of both conduction systems, including the LAF, during sinus rhythm and ventricular parasystole were obtained using a parallel mapping system. Read More

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Fascicular parasystole and recurrent syncope - a case report.

Eur Heart J Case Rep 2018 Mar 5;2(1):yty020. Epub 2018 Mar 5.

Department of Cardiology and Angiology I, Heart Center Freiburg University, Hugstetter Str. 55, 79106 Freiburg, Germany.

Introduction: Parasystole refers to an ectopic pacemaker that discharges with a constant rate competing with the primary pacemaker of the heart the sinus node. Parasystolic pacemakers have been described in the atrium, atrioventricular node, His bundle, and in the ventricle. Ventricular parasystole usually carries a benign prognosis, but there are a few reports of ventricular tachyarrhythmia initiated by parasystolic beats. Read More

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Ablation of unmappable ventricular parasystole originating from the right ventricular outflow tract: a case report.

BMC Cardiovasc Disord 2019 01 5;19(1). Epub 2019 Jan 5.

Department of Cardiology, Zhejiang Provincial People's Hospital, Hangzhou, 310014, China.

Background: When the coupling interval is matched, ventricular parasystole can form a stable fusion QRS complex with sinus rhythm. Ablation of a fusion QRS complex has been rarely reported and is unexpectedly difficult.

Case Presentation: We describe a case of ventricular parasystole from muscle sleeves of the right ventricular outflow tract. Read More

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January 2019

Coupling interval variability of premature ventricular contractions in patients with different underlying pathology: an insight into the arrhythmia mechanism.

J Interv Card Electrophysiol 2018 Jan 5;51(1):25-33. Epub 2018 Jan 5.

Department of Cardiology, Electrophysiology, Erasmus Medical Center, Rotterdam, The Netherlands.

Purpose: Coupling interval (CI) variability of premature ventricular contractions (PVCs) is influenced by the underlying arrhythmia mechanism. The aim of this study was to compare CI variability of PVCs in different myocardial disease entities, in order to gain insight into their arrhythmia mechanism.

Methods: Sixty-four patients with four underlying pathologies were included: idiopathic (n = 16), non-ischemic dilated cardiomyopathy (NIDCM) (n = 16), familial cardiomyopathy (PLN/LMNA) (n = 16), and post-MI (n = 16)-associated PVCs. Read More

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January 2018

Ventricular Parasystole in a Neonatal Rhesus Macaque ().

Comp Med 2016 12;66(6):489-493

Division of Comparative Medicine, Oregon National Primate Research Center, Beaverton, Oregon.

A 6-d-old Indian-origin female rhesus macaque (Macaca mulatta) presented with bradycardia shortly after sedation with ketamine. No other cardiac abnormalities were apparent. Approximately 2 wk after the initial presentation, the macaque was again bradycardic and exhibited a regularly irregular arrhythmia on a prestudy examination. Read More

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December 2016

Parasystole in a mahaim accessory pathway.

Indian Pacing Electrophysiol J 2014 Jul 15;14(4):211-6. Epub 2014 Jul 15.

Abertawe Bro Morganng NHS Trust, United Kingdom.

Hypertrophic cardiomyopathy's (HCM) association with sudden cardiac death is well recognised. The risk of sudden cardiac death is known to increase when there is a history of unexplained syncope, abnormal blood pressure response during exercise, severe left ventricular hypertrophy or a family history of unexplained death. Implantable Cardioverter Defibrillator (ICD) implantation has been widely used for primary and secondary prevention of sudden cardiac death (SCD) in people with HCM. Read More

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Are those premature ventricular complexes?!

Am J Emerg Med 2014 Apr 8;32(4):396.e1-2. Epub 2013 Nov 8.

Department of Internal Medicine, SUNY Upstate Medical University, St Syracuse, NY 13202, USA.

Ventricular parasystole has been known to be a benign rhythm. We present a case of a 53-year-old man with chest pain and ventricular parasystole on electrocardiogram upon initial presentation. He was admitted and found to have normal serial cardiac enzymes and nuclear stress testing. Read More

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[Significance of Tp-Te interval for risk stratification of ventricular premature contractions in children].

Zhongguo Dang Dai Er Ke Za Zhi 2013 Nov;15(11):1014-7

Department of Pediatrics, West China Second Hospital of Sichuan University, Chengdu 610041, China.

Objective: To investigate the significance of Tp-Te interval for risk stratification of ventricular premature contractions (VPC) in children.

Methods: A total of 120 children with VPC were divided into benign VPC (n=40), organic disease (n=40) and ventricular parasystole groups (n=40) according to the etiology of VPC; another 40 children who underwent physical examination were selected as the normal control group. The four groups were compared in terms of Tp-Te intervals and Tp-Te/QT ratios in leads V3, V4 and V5. Read More

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November 2013

Modulated parasystole: still relevant after all these years!

José Jalife

Heart Rhythm 2013 Oct 24;10(10):1441-3. Epub 2013 Jun 24.

Center for Arrhythmia Research, University of Michigan, Ann Arbor, Michigan. Electronic address:

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October 2013

Strong modulation of ectopic focus as a mechanism of repetitive interpolated ventricular bigeminy with heart rate doubling.

Heart Rhythm 2013 Oct 18;10(10):1433-40. Epub 2013 Jun 18.

Department of Cardiology, Dokkyo Medical University Koshigaya Hospital, Koshigaya, Japan. Electronic address:

Background: Repetitive interpolated ventricular bigeminy (RIVB) can introduce a doubling of the ventricular rate.

Objective: To clarify the mechanism of RIVB, we hypothesized that it was introduced by a strong modulation of the ventricular automatic focus.

Methods: RIVB, defined as more than 7 bigeminy events, was detected by instantaneous heart rate and bigeminy interval (BI) tachograms in 1450 successive patients with frequent ventricular premature contractions (≥3000 per day). Read More

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October 2013

A simple model of the right atrium of the human heart with the sinoatrial and atrioventricular nodes included.

J Clin Monit Comput 2013 Aug 22;27(4):481-98. Epub 2013 Feb 22.

Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662, Warsaw, Poland.

Existing atrial models with detailed anatomical structure and multi-variable cardiac transmembrane current models are too complex to allow to combine an investigation of long time dycal properties of the heart rhythm with the ability to effectively simulate cardiac electrical activity during arrhythmia. Other ways of modeling need to be investigated. Moreover, many state-of-the-art models of the right atrium do not include an atrioventricular node (AVN) and only rarely--the sinoatrial node (SAN). Read More

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Ventricular arrhythmias in children with attention deficit disorder--a symptom of autonomic imbalance?

Cardiol Young 2014 Feb 12;24(1):120-5. Epub 2013 Feb 12.

Department of Paediatrics, Caritas Krankenhaus, Bad Mergentheim, Germany.

Objectives: Potential side effects of stimulants for attention deficit disorder are in the focus of scientific discussions, intensified by the higher number of prescriptions. Children with known arrhythmias or other severe cardiac problems should not receive stimulants because of their sympathomimetic effects.

Methods: This is a retrospective analysis of 24-hour Holter electrocardiograms from 100 consecutive children with attention deficit disorder from January, 2006 to April, 2012. Read More

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February 2014

New methods for the analysis of heartbeat behavior in risk stratification.

Front Physiol 2011 29;2:88. Epub 2011 Nov 29.

Department of Physiology, McGill University Montreal, QC, Canada.

Developing better methods for risk stratification for tachyarrhythmic sudden cardiac remains a major challenge for physicians and scientists. Since the transition from sinus rhythm to ventricular tachycardia/fibrillation happens by different mechanisms in different people, it is unrealistic to think that a single measure will be adequate to provide a good index for risk stratification. We analyze the dynamical properties of ventricular premature complexes over 24 h in an effort to understand the underlying mechanisms of ventricular arrhythmias and to better understand the arrhythmias that occur in individual patients. Read More

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October 2012

Left ventricular outflow tract parasystole.

Arch Cardiovasc Dis 2011 May 26;104(5):359-60. Epub 2011 Mar 26.

Arrhythmia Service, Kingston General Hospital, Queen's University, Ontario, Canada.

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Premature ventricular contractions originating from the left ventricular septum: results of radiofrequency catheter ablation in twenty patients.

BMC Cardiovasc Disord 2011 Jun 2;11:27. Epub 2011 Jun 2.

Department of Cardiology, Second Affiliated Hospital of Wenzhou Medical College, Wenzhou 325000, China.

Background: RFCA has been established as an effective and curative therapy for severely symptomatic PVC from the outflow tract in structurally normal hearts. However, it is unknown whether PVCs originating from the left ventricular septum, are effectively eliminated by RFCA. This study aimed to investigate electrophysiologic characteristics and effects of radiofrequency catheter ablation (RFCA) for patients with symptomatic premature ventricular contraction (PVC) originating from the left ventricular septum without including fascicular PVCs. Read More

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Doubling of the ventricular rate by interpolated junctional extrasystoles resembling supraventricular tachycardia.

Pacing Clin Electrophysiol 2010 Aug 21;33(8):945-9. Epub 2010 May 21.

Cedars Sinai Heart Institute, Los Angeles, California, USA.

In a study of seven cases of paroxysmal supraventricular tachycardia, it was noted that the fast rate was not caused by the mechanism of rapid firing, reentry, or dual atrioventricular nodal conduction but by an abrupt doubling of the rate by interpolation of junctional extrasystoles between adjacent sinus beats while the sinus mechanism remained undisturbed. Dual ventricular response to a single atrial depolarization was seriously considered in each case. The intervals separating the junctional extrasystoles tended to be quite fixed, thus conforming to the pattern of junctional parasystole with an intrinsic rate very close to the rate of the dominant sinus rhythm. Read More

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The role of local voltage potentials in outflow tract ectopy.

Europace 2010 Jun 22;12(6):850-60. Epub 2010 Apr 22.

Cardiology Department, Gentofte University Hospital, Niels Andersensvej 65, Copenhagen 2900, Denmark.

Aims: Discrete, fragmented, local voltage potentials (LVPs) have been observed in electrograms recorded at the ablation site in patients undergoing radiofrequency ablation for arrhythmias originating in both the right and left ventricular outflow tract; however, the incidence and the significance of the LVP with respect to arrhythmogenesis is uncertain.

Methods And Results: We studied 25 patients with outflow tract arrhythmias referred for radiofrequency catheter ablation and recorded high-amplified intracardiac electrograms close to the site of origin of the arrhythmia. Ten patients undergoing ablation for supraventricular arrhythmias served as controls. Read More

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Parasystole: automaticity or re-entry?

Giuseppe Oreto

J Cardiovasc Med (Hagerstown) 2010 May;11(5):336

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Parasystole due to re-entry as the possible mechanism of ventricular parasystole with second-degree entrance block.

J Cardiovasc Med (Hagerstown) 2010 May;11(5):327-35

Hokkaido University, Sapporo, Japan.

Background: In 1974, Kinoshita reported a case of 'irregular parasystole' due to type I second-degree entrance block. Since then, many cases of such 'irregular' parasystole have been reported by us. To explain the mechanism of 'irregular' parasystole, two theories have been suggested, namely, 'electrotonic modulation' by Jalife and Moe, and 'type I second-degree entrance block' by us. Read More

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Nodal rhythm and ventricular parasystole: an unusual electrocardiographic presentation of mad honey poisoning.

Clin Cardiol 2009 Nov;32(11):E52-4

Istanbul University, Institute of Cardiology, Department of Cardiology, Division of Pacemaker and Electrophysiology, Haseki-Fatih, Istanbul, Turkey.

Mad honey poisoning syndrome has been reported in the Eastern Black Sea region and Southeastern regions of Turkey. Herein we report a case of 70-y-old man presented with syncope and severe hemodynamic instability following ingestion of one teaspoon of honey and his unusual electrocardiographic manifestations: nodal rhythm alternating with sinus bradycardia and intermittant ventricular parasystole. In this report, we also tried to explain the possible mechanism responsible for these electrocardiographic findings. Read More

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November 2009

Two ventricular tachycardias with cycle length and QRS alternans: insights into the mechanism from mapping and ablation of the tachycardias.

Pacing Clin Electrophysiol 2009 Dec 10;32(12):e31-5. Epub 2009 Sep 10.

Ohio State University Hospitals, Columbus, Ohio, USA.

This case describes a patient with two separate foci of idiopathic ventricular tachycardia in the right ventricle. Both of the tachycardias manifested cycle length and QRS alternans. Both were successfully ablated and information from the electrophysiologic study and ablation procedure indicated that both tachycardias were focal, secondary to triggered activity, and that the best model to explain the cycle length and QRS alternans during tachycardia was that of "self-entraining modulated parasystole. Read More

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December 2009

Narrow and broad QRS complexes: what is the mechanism?

Heart Rhythm 2010 Apr 18;7(4):565-6. Epub 2009 May 18.

Department of Electrophysiology, The Heart Hospital, University College London, UK.

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Atrial parasystole in left ventricular noncompaction: a morphofunctional study by echocardiography and magnetic resonance imaging.

J Cardiovasc Med (Hagerstown) 2008 Mar;9(3):285-8

Cardiology Unit, University Hospital of Messina, Messina, Italy.

Isolated left ventricular noncompaction is a recently recognized age-independent cardiac genetic disorder caused by heterogeneous defects in endo-myocardial morphogenesis. Transthoracic echocardiography and cardiac magnetic resonance are the most reliable techniques to make a diagnosis of the disease, noninvasively. Arrhythmic atrial and ventricular disorders have been reported in 20-50% of these patients. Read More

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Apparent disappearance of ventricular parasystole due to a marked difference between the long form and the short form of the ectopic cycles.

J Cardiovasc Med (Hagerstown) 2007 Mar;8(3):192-6

Hokkaido University, Sapporo, Japan.

Electrocardiograms were taken from a 44-year-old man with irregular ventricular parasystole in whom pure parasystolic cycles without any intervening nonectopic QRS complexes were found. When a sinus impulse fell late in the parasystolic cycle, it hastened occurrence of the next parasystolic discharge. This suggested that type I second degree entrance block occurred in the re-entrant pathway containing the parasystolic focus. Read More

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Variation in parasystolic cycle length.

Int Heart J 2006 Jan;47(1):153-8

Division of Cardiovascular Disease, The Institute for Adult Diseases Asahi Life Foundation, Tokyo, Japan.

At the time of the first visit to our clinic, an electrocardiographic examination of a 73-year-old female patient revealed ventricular premature contractions (VPCs) with variable coupling intervals that were diagnosed as parasystole. Characteristically many of the parasystoles had no sinus contractions between two consecutive VPCs, which we referred to as pure parasystole. We first repeatedly examined variations in the length of the parasystolic cycles between January 6, 1997 and March 2, 2003 using electrocardiography. Read More

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January 2006

Group beating resulting from ventricular parasystole.

D Luke Glancy

Proc (Bayl Univ Med Cent) 2003 Jul;16(3):352-3

Department of Medicine, Louisiana State University Health Sciences Center, New Orleans, Louisiana 70112, USA.

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Fascicular tachycardia and parasystole of right bundle branch origin.

Heart Rhythm 2005 Sep;2(9):994-6

Department of Cardiology, Queen Elizabeth Hospital, Birmingham, United Kingdom.

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September 2005

Model of bidirectional modulated parasystole as a mechanism for cyclic bursts of ventricular premature contractions.

Biol Cybern 2004 Jul 9;91(1):37-47. Epub 2004 Aug 9.

Department of Medical Informatics, Kitasato University, Kanagawa, Japan.

Cyclic bursts of ventricular premature contractions (VPC) coming at minute-order intervals have been discerned by analyzing ambulatory ECG recordings, and their mechanism has not been clarified. The present study simulates this phenomenon by constructing a bidirectional modulated parasystole model. With Ts and Te as the intrinsic periods of the sinus and ectopic pacemakers, there are distinct and initial condition-dependent solutions in the model with Ts / Te values close to 1, 1/2, 1/4, etc. Read More

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ECG of the month. Premature beats. Ventricular parasystole.

J La State Med Soc 2003 Mar-Apr;155(2):73-4

Cardiovascular Fellowship Training Program, Louisiana State University Health Sciences Center, New Orleans, USA.

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