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Complex Tachycardia (complex + tachycardia)

Distribution by Scientific Domains
Medical Sciences100%

Kinds of Complex Tachycardia

  • QR complex tachycardia
    		•
  • narrow QR complex tachycardia
    		•
  • wide complex tachycardia
    		•

    Selected Abstracts

    Hypersensitivity Myocarditis Presenting as Atrioventricular Block and Wide Complex Tachycardia in a Toddler

    CONGENITAL HEART DISEASE, Issue 5 2008
    Neil Bhogal MD
    ABSTRACT A 13-month-old boy presented with acute onset of complete atrioventricular block and wide complex tachycardia but normal hemodynamics. Endomyocardial biopsy disclosed active myocarditis with eosinophils, suggesting a hypersensitivity reaction. With no treatment, the rhythm disturbance resolved within days of onset. Our patient's presentation and self-limited illness is unique. To our knowledge, this is only the second reported case of eosinophilic myocarditis in a young child or infant. [source]

    A Long-RP Narrow QRS Complex Tachycardia With Alternating Cycle Length: What is the Mechanism?

    JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 5 2010
    MIGUEL A. ARIAS M.D., Ph.D.
    No abstract is available for this article. [source]

    Mechanism of Wide Complex Tachycardia in a Structurally Normal Heart

    JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 9 2009
    ZIAD F. ISSA M.D.
    [source]

    A Case of Narrow Complex Tachycardia

    JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 3 2008
    AMIR ABDELWAHAB M.B. B.Ch., M.Sc.
    No abstract is available for this article. [source]

    A Wide Complex Tachycardia: What is the Mechanism?

    JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 3 2008
    MICHAEL KUHNE M.D.
    No abstract is available for this article. [source]

    Narrow QRS Complex Tachycardia Following Tricuspid Valve Replacement

    JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 8 2004
    VOLKHARD GOEBER M.D.
    [source]

    Bedside Electrophysiology Study Using an Implantable Cardioverter-Defibrillator for Rapid Diagnosis of Wide Complex Tachycardia

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 1 2010
    JOSHUA D. MOSS M.D.
    No abstract is available for this article. [source]

    A Technique for the Rapid Diagnosis of Wide Complex Tachycardia with 1:1 AV Relationship in the Electrophysiology Laboratory

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 4 2009
    AMIR ABDELWAHAB M.B. B.Ch., M.Sc.
    Background:The differential diagnosis of wide complex tachycardia (WCT) with 1:1 atrioventricular (AV) relationship is broad. Accurate identification of the tachycardia mechanism is essential for successful ablation. We suggest a simple pacing maneuver that can immediately clarify the tachycardia mechanism in the electrophysiology laboratory. Methods:Eight consecutive patients (four males, 32 ± 14 years) demonstrating stable sustained WCT with persistent 1:1 AV relationship during electrophysiologic testing were included in this study. During the tachycardia, atrial overdrive pacing was performed. The following responses were observed: (1) a change of the QRS morphology during atrial pacing and (2) the first return electrogram of the tachycardia, whether occurring in the atrium (AVA response) or in the ventricle (AVVA response). Results:Atrial overdrive pacing was successfully performed in all patients. It was associated with either a change or narrowing of the QRS in all ventricular tachycardia (VT) patients but not in supraventricular tachycardia (SVT) patients. All VT patients had an AVVA response upon cessation of atrial overdrive pacing as opposed to AVA response in SVT patients, P = 0.029. Conclusion:The response to atrial overdrive pacing during WCT with 1:1 AV relationship can rapidly diagnose or rule out VT as a mechanism of tachycardia. [source]

    Latent Atriofascicular Pathway Participating in a Wide Complex Tachycardia: Differentiation from Ventricular Tachycardia

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 12 2006
    MOHAMMAD V. JORAT M.D.
    Accessory pathways with anterograde decremental conduction properties usually are characterized by presence of antegrade preexcitation during atrial pacing. We report a 38-year-old man with frequent episodes of palpitation. No evidence of ventricular preexcitation was seen during sinus rhythm or atrial pacing. All electrophysiologic maneuvers were compatible with an antidromic tachycardia using atriofascicular pathway as the antegrade limb and the atrioventricular nodal pathway as retrograde limb. Radiofrequency ablation at recording site of accessory pathway potential resulted in cure of tachycardia with no recurrence during 3-month follow-up. This report indicated that atriofascicular pathway-mediated tachycardia should be considered in differential diagnosis of all cases of wide complex tachycardia with left bundle branch morphology and left axis. [source]

    The Reliable Electrocardiographic Diagnosis of Regular Broad Complex Tachycardia: A Holy Grail That Will Forever Elude the Clinician's Grasp?

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 12 2002
    ERNEST W. LAU
    LAU, E.W., et al.: The Reliable Electrocardiographic Diagnosis of Regular Broad Complex Tachycardia: A Holy Grail That Will Forever Elude the Clinician's Grasp? The reliable and accurate diagnosis of regular broad complex tachycardia (BCT) by the ECG is a goal that has eluded clinicians and electrophysiologists alike for years. This article explores the reason for this by first giving an historical account on the development of the subject. Next, the electrophysiological mechanisms of ventricular tachycardia, supraventricular tachycardia with aberrant conduction, and preexcited tachycardia, the three main differential diagnoses for regular BCT, according to the latest knowledge from cellular and clinical electrophysiology study will be reviewed, together with considerations on how such understanding may help account for the manifestations of these tachycardias on the ECG and the difficulty in distinguishing between them. Finally, the use of electrophysiological study as the criterion standard for diagnosing regular BCT, as has been the case in most studies on the subject, will be critiqued in terms of the potential for misdiagnosis by the method and the use of any ECG diagnostic algorithms developed with its aid in the acute medical care setting. [source]

    Alternating Narrow and Wide Complex Tachycardia

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 1 2002
    PAUL KHAIRY
    No abstract is available for this article. [source]

    A Regular Narrow QRS Complex Tachycardia with Atrioventricular Dissociation

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 7 2001
    JEN-YUAN KUO
    No abstract is available for this article. [source]

    Alternating Wide and Narrow QRS Complex Tachycardias:

    JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 6 2004
    What is the Mechanism?
    No abstract is available for this article. [source]

    A Narrow and Two Wide QRS Complex Tachycardias: What are the Mechanisms?

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 5 2002
    JOHN P. MARENCO
    First page of article [source]

    Wide and Narrow Complex Tachycardias: What Is the Mechanism?

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 12 2001
    SAMIR SABA
    No abstract is available for this article. [source]

    Hypersensitivity Myocarditis Presenting as Atrioventricular Block and Wide Complex Tachycardia in a Toddler

    CONGENITAL HEART DISEASE, Issue 5 2008
    Neil Bhogal MD
    ABSTRACT A 13-month-old boy presented with acute onset of complete atrioventricular block and wide complex tachycardia but normal hemodynamics. Endomyocardial biopsy disclosed active myocarditis with eosinophils, suggesting a hypersensitivity reaction. With no treatment, the rhythm disturbance resolved within days of onset. Our patient's presentation and self-limited illness is unique. To our knowledge, this is only the second reported case of eosinophilic myocarditis in a young child or infant. [source]

    A Technique for the Rapid Diagnosis of Wide Complex Tachycardia with 1:1 AV Relationship in the Electrophysiology Laboratory

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 4 2009
    AMIR ABDELWAHAB M.B. B.Ch., M.Sc.
    Background:The differential diagnosis of wide complex tachycardia (WCT) with 1:1 atrioventricular (AV) relationship is broad. Accurate identification of the tachycardia mechanism is essential for successful ablation. We suggest a simple pacing maneuver that can immediately clarify the tachycardia mechanism in the electrophysiology laboratory. Methods:Eight consecutive patients (four males, 32 ± 14 years) demonstrating stable sustained WCT with persistent 1:1 AV relationship during electrophysiologic testing were included in this study. During the tachycardia, atrial overdrive pacing was performed. The following responses were observed: (1) a change of the QRS morphology during atrial pacing and (2) the first return electrogram of the tachycardia, whether occurring in the atrium (AVA response) or in the ventricle (AVVA response). Results:Atrial overdrive pacing was successfully performed in all patients. It was associated with either a change or narrowing of the QRS in all ventricular tachycardia (VT) patients but not in supraventricular tachycardia (SVT) patients. All VT patients had an AVVA response upon cessation of atrial overdrive pacing as opposed to AVA response in SVT patients, P = 0.029. Conclusion:The response to atrial overdrive pacing during WCT with 1:1 AV relationship can rapidly diagnose or rule out VT as a mechanism of tachycardia. [source]

    Runaway Implantable Defibrillator,A Rare Complication of Radiation Therapy

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 5 2007
    EMEC M.D., F.A.C.C., JAN N
    A case of a patient with runaway implantable cardioverter defibrillator (ICD) due to radiation therapy of a lung cancer is reported. This manifested as poorly tolerated wide complex tachycardia due to inappropriate rapid ventricular pacing, The event terminated with polymorphic VT, which inhibited pacing and ceased spontaneously before ICD discharge. The likely cause was corruption of device random access memory by ionizing radiation. [source]

    Latent Atriofascicular Pathway Participating in a Wide Complex Tachycardia: Differentiation from Ventricular Tachycardia

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 12 2006
    MOHAMMAD V. JORAT M.D.
    Accessory pathways with anterograde decremental conduction properties usually are characterized by presence of antegrade preexcitation during atrial pacing. We report a 38-year-old man with frequent episodes of palpitation. No evidence of ventricular preexcitation was seen during sinus rhythm or atrial pacing. All electrophysiologic maneuvers were compatible with an antidromic tachycardia using atriofascicular pathway as the antegrade limb and the atrioventricular nodal pathway as retrograde limb. Radiofrequency ablation at recording site of accessory pathway potential resulted in cure of tachycardia with no recurrence during 3-month follow-up. This report indicated that atriofascicular pathway-mediated tachycardia should be considered in differential diagnosis of all cases of wide complex tachycardia with left bundle branch morphology and left axis. [source]

    The Reliable Electrocardiographic Diagnosis of Regular Broad Complex Tachycardia: A Holy Grail That Will Forever Elude the Clinician's Grasp?

    PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 12 2002
    ERNEST W. LAU
    LAU, E.W., et al.: The Reliable Electrocardiographic Diagnosis of Regular Broad Complex Tachycardia: A Holy Grail That Will Forever Elude the Clinician's Grasp? The reliable and accurate diagnosis of regular broad complex tachycardia (BCT) by the ECG is a goal that has eluded clinicians and electrophysiologists alike for years. This article explores the reason for this by first giving an historical account on the development of the subject. Next, the electrophysiological mechanisms of ventricular tachycardia, supraventricular tachycardia with aberrant conduction, and preexcited tachycardia, the three main differential diagnoses for regular BCT, according to the latest knowledge from cellular and clinical electrophysiology study will be reviewed, together with considerations on how such understanding may help account for the manifestations of these tachycardias on the ECG and the difficulty in distinguishing between them. Finally, the use of electrophysiological study as the criterion standard for diagnosing regular BCT, as has been the case in most studies on the subject, will be critiqued in terms of the potential for misdiagnosis by the method and the use of any ECG diagnostic algorithms developed with its aid in the acute medical care setting. [source]

    Adenosine-Induced Ventricular Arrhythmias in Patients with Supraventricular Tachycardias

    ANNALS OF NONINVASIVE ELECTROCARDIOLOGY, Issue 4 2008
    Cagatay Ertan M.D.
    Background: Adenosine is widely used for the diagnosis and the termination of supraventricular arrhythmias. There are many case reports and few series about the proarrhythmic potential of adenosine. We sought to evaluate the proarrhythmic potential of adenosine used to terminate the supraventricular arrhythmias. Methods: The records of all patients that received adenosine for the termination of supraventricular tachycardia were reviewed retrospectively and those with a continuous electrocardiographic (ECG) recording during adenosine administration were included to the study. Results: Our search identified 52 supraventricular episodes of 46 patients with a continuous ECG recording during adenosine administration. Following adenosine administration, premature ventricular contraction (PVC) or ventricular tachycardia (VT) developed in 22 (47.8%) patients and in 26 (50%) tachycardia episodes. No patient had a sustained VT. Nonsustained VT developed in eight (17.4%) patients. All VT episodes were polymorphic, short, and self-terminating. When the basal and demographic properties of patients with PVC or VT and those without PVT or VT were compared, there was no significant difference. Conclusions: Adenosine is a quite safe and effective drug for the termination of narrow QRS complex tachycardia but it often induces nonsustained VT or PVC that are clinically insignificant in the absence of other accompanying heart disease. [source]

    Wide QRS Tachycardia: What Is the Rhythm?

    ANNALS OF NONINVASIVE ELECTROCARDIOLOGY, Issue 4 2006
    Jonathan Rosman M.D.
    We report a case of an elderly man who presented to the emergency room complaining of palpitations. Electrocardiogram revealed wide QRS tachycardia with a narrow beat within the tachycardia. Most commonly, a narrow complex beat during a wide complex tachycardia suggests a capture or fusion beat in the setting of ventricular tachycardia. However, there are situations where supraventricular tachycardia can also manifest this way. In our patient a pacemaker interrogation clarified the diagnosis. [source]

    Images in cardiology: Ventriculo-arital wenckebach during wide complex tachycardia

    CLINICAL CARDIOLOGY, Issue 11 2006
    Romulo F. Baltazar M.D.
    No abstract is available for this article. [source]

    Clinical Utility of aVR,The Neglected Electrocardiographic Lead

    ANNALS OF NONINVASIVE ELECTROCARDIOLOGY, Issue 2 2010
    Dmitriy Kireyev M.D.
    Background: Several studies suggest that electrocardiographers tend to neglect lead aVR during the reading of electrocardiograms (ECGs). Our objective was to provide a systematic review of the most important diagnostic and prognostic uses of lead aVR. Methods: We performed a thorough review of the literature about the lead aVR using PubMed, MEDLINE and the archives of the University at Buffalo libraries. Results: We found that lead aVR may provide important additional information in the diagnosis of coronary artery disease. It may provide a clue to the location of a lesion as well as the possibility of three vessel disease during an acute coronary syndrome. Lead aVR was found useful in the locus of arrhythmias and in differentiation of narrow and wide QRS complex tachycardias. It provides useful prognostic information for patients with the Brugada syndrome and tricyclic antidepressant toxicity. Lead aVR provides alternative criteria for the electrocardiographic diagnosis of left ventricular hypertrophy and left anterior fascicular block. Conclusion: Lead aVR provides very important additional diagnostic and prognostic information in multiple cardiac conditions and can be used either alone or in conjunction with other electrocardiographic leads. Ann Noninvasive Electrocardiol 2010;15(2):175,180 [source]