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John D Carr - One of the best experts on this subject based on the ideXlab platform.

  • Magnesium sulfate for conversion of Supraventricular Tachycardia refractory to intravenous adenosine
    Annals of Emergency Medicine, 1996
    Co-Authors: Todd J Leduc, John D Carr
    Abstract:

    Abstract The use of magnesium sulfate infusion for the management of cardiac dysrhythmia has recently gained popularity. Magnesium sulfate has been advocated for the management of torsade de pointes and other ventricular dysrhythmias. We report the case of a 38-year-old firefighter with atrial Tachycardia that was treated unsuccessfully according to Advanced Cardiac Life Support guidelines with IV adenosine. Subsequently, 2 g of magnesium sulfate was administered intravenously over 5 minutes with resulting conversion of the patients' Supraventricular Tachycardia to normal sinus rhythm, with complete resolution of symptoms. [LeDuc TJ, Carr JD: Magnesium sulfate for conversion of Supraventricular Tachycardia refractory to intravenous adenosine. Ann Emerg Med March 1996;27:375-378.]

Fred Morady - One of the best experts on this subject based on the ideXlab platform.

  • Paroxysmal Supraventricular Tachycardia
    Practical Cardiology, 2020
    Co-Authors: Hakan Oral, Fred Morady
    Abstract:

    Supraventricular Tachycardias arise in or involve at least some part of the atrium or atrioventricular junction. Supraventricular Tachycardias develop as a result of abnormal automaticity, triggered activity or, most commonly, reentry. Both atrial flutter and atrial fibrillation are Supraventricular Tachycardias; however, because of the differences in their mechanisms and clinical manifestations, they are grouped separately from other types of Supraventricular Tachycardias, commonly referred to as paroxysmal Supraventricular Tachycardia (PSVT).

  • The Response of Paroxysmal Supraventricular Tachycardia to Overdrive Atrial and Ventricular Pacing
    Journal of cardiovascular electrophysiology, 1993
    Co-Authors: Alan H. Kadish, Fred Morady
    Abstract:

    Pacing During Supraventricular Tachycardia. Introduction: Standard electrophysiologic techniques generally allow discrimination among mechanisms of paroxysmal Supraventricular Tachycardia. The purpose of this study was to determine whether the response of paroxysmal Supraventricular Tachycardia to atrial and ventricular overdrive pacing can help determine the Tachycardia mechanism. Methods and Results: Fifty-three patients with paroxysmal Supraventricular Tachycardia were studied. Twenty-two patients had the typical form of atrioventricular (AV) junctional (nodal) reentry, 18 patients had orthodromic AV reentrant Tachycardia, 10 patients had atrial Tachycardia, and 3 patients had the atypical form of AV nodal reentrant Tachycardia. After paroxysmal Supraventricular Tachycardia was induced, 15-beat trains were introduced in the high right atrium and right ventricular apex sequentially with cycle lengths beginning 10 msec shorter than the spontaneous Tachycardia cycle length. The pacing cycle length was shortened in successive trains until a cycle of 200 msec was reached or until Tachycardia was terminated. Several responses of paroxysmal Supraventricular Tachycardia to overdrive pacing were useful in distinguishing atrial Tachycardia from other mechanisms of paroxysmal Supraventricular Tachycardia. During decremental atrial overdrive pacing, the curve relating the pacing cycle length to the VA interval on the first beat following the cessation of atrial pacing was flat or upsloping in patients with AV junctional reentry or AV reentrant Tachycardia, but variable in patients with atrial Tachycardia. AV reentry and AV junctional reentry could always be terminated by overdrive ventricular pacing whereas atrial Tachycardia was terminated in only one of ten patients (P < 0.001). The curve relting the ventricular pacing cycle length to the VA interval on the first postpacing beat was flat or upsloping in patients with AV junctional reentry and AV reentry, but variable in patients with atrial Tachycardia. The typical form of AV junctional reentry could occasionally be distinguished from other forms of paroxysmal Supraventricular Tachycardia by the shortening of the AH interval following Tachycardia termination during constant rate atrial pacing. Conclusions: Atrial and ventricular overdrive pacing can rapidly and reliably distinguish atrial Tachycardia from other mechanisms of paroxysmal Supraventricular Tachycardia and occasionally assist in the diagnosis of other Tachycardia mechanisms. In particular, the ability to exclude atrial Tachycardia as a potential mechanism for paroxysmal Supraventricular Tachycardia has important implications for the use of catheter ablation techniques to cure paroxysmal Supraventricular Tachycardia.

Todd J Leduc - One of the best experts on this subject based on the ideXlab platform.

  • Magnesium sulfate for conversion of Supraventricular Tachycardia refractory to intravenous adenosine
    Annals of Emergency Medicine, 1996
    Co-Authors: Todd J Leduc, John D Carr
    Abstract:

    Abstract The use of magnesium sulfate infusion for the management of cardiac dysrhythmia has recently gained popularity. Magnesium sulfate has been advocated for the management of torsade de pointes and other ventricular dysrhythmias. We report the case of a 38-year-old firefighter with atrial Tachycardia that was treated unsuccessfully according to Advanced Cardiac Life Support guidelines with IV adenosine. Subsequently, 2 g of magnesium sulfate was administered intravenously over 5 minutes with resulting conversion of the patients' Supraventricular Tachycardia to normal sinus rhythm, with complete resolution of symptoms. [LeDuc TJ, Carr JD: Magnesium sulfate for conversion of Supraventricular Tachycardia refractory to intravenous adenosine. Ann Emerg Med March 1996;27:375-378.]

Jeremy N. Ruskin - One of the best experts on this subject based on the ideXlab platform.

  • Adenosine and the treatment of Supraventricular Tachycardia.
    The American journal of medicine, 1992
    Co-Authors: Andrew C. Rankin, Jeremy N. Ruskin, Ross Brooks, Brian A. Mcgovern
    Abstract:

    Adenosine has recently become widely available for the treatment of paroxysmal Supraventricular Tachycardia. In order to evaluate its role in the management of arrhythmias, we have reviewed the literature on the cellular mechanisms, metabolism, potential for adverse effects, and clinical experience of the efficacy and safety of intravenous adenosine. Adenosine produces transient atrioventricular nodal block when injected as an intravenous bolus. This is of therapeutic value in the conversion to sinus rhythm of the majority of paroxysmal Supraventricular Tachycardias, which involve the atrioventricular node in a re-entrant circuit. The mean success rate was 93% from over 600 reported episodes. Compared with other antiarrhythmic agents, adenosine is remarkable for its rapid metabolism and brevity of action, with a half-life of a few seconds. It commonly produces subjective symptoms, particularly chest discomfort, dyspnea, and flushing, which are of short duration only. No serious adverse effect has been reported. Arrhythmias may recur within minutes in a minority of patients. Comparative studies have shown that adenosine is as effective as verapamil in the treatment of Supraventricular Tachycardia, and has less potential for adverse effects. Patients with Supraventricular Tachycardia should initially be treated using vagotonic physical maneuvers. Immediate electrical cardioversion is indicated if the arrhythmia is associated with hemodynamic collapse. Adenosine is the preferred drug in those patients in whom verapamil has failed or may cause adverse effects, such as those with heart failure or wide-complex Tachycardia. The safety profile of adenosine suggests that it should be the drug of first choice for the treatment of Supraventricular Tachycardia, but only limited comparative data to support this view are available at present.

  • Catheter Ablation for Supraventricular Tachycardia
    The New England journal of medicine, 1991
    Co-Authors: Jeremy N. Ruskin
    Abstract:

    Although its true prevalence in the general population is unknown, Supraventricular Tachycardia is the most common cause of paroxysmal Tachycardia in children and young adults. These arrhythmias ar...

Mark A Hlatky - One of the best experts on this subject based on the ideXlab platform.