• KOL
    • Flecainide Acetate
    • Kevin J Hellestrand
    • KEVIN J HELLESTRAND: Influence Statistics

      KEVIN J HELLESTRAND

      KEVIN J HELLESTRAND

      From the Department of Cardiology, St. Bartholomew's Hospital, London, England, and the Department of Cardiology, Royal North Shore Hospital, Sydney, Australia | Department of ...

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      KEVIN J HELLESTRAND:Expert Impact

      Concepts for whichKEVIN J HELLESTRANDhas direct influence:Flecainide acetate,Intravenous flecainide,Proarrhythmic effects,Tachycardia termination,Electrophysiological effects,Intravenous flecainide acetate,Electrophysiologic effects,Cardiac transplantation.

      KEVIN J HELLESTRAND:KOL impact

      Concepts related to the work of other authors for whichfor which KEVIN J HELLESTRAND has influence:Atrial fibrillation,Ventricular tachycardia,Flecainide acetate,Sinus rhythm,Heart transplantation,Electrophysiologic effects,Cardiac pacing.

      KOL Resume for KEVIN J HELLESTRAND

      Year
      1991

      From the Department of Cardiology, St. Bartholomew's Hospital, London, England, and the Department of Cardiology, Royal North Shore Hospital, Sydney, Australia

      1985

      Department of Cardiology, St. Bartholomew’s Hospital, West Smith-field, EC1A 7BE, London, England

      1984

      Department of Cardiology, St. Bartholomew's Hospital, London, England

      1982

      From the Deparlment of Cardiology, St. Bartholomew's Hospital, West Smithfield, London, England

      Cardiovascular Unit, St. Vincent's Hospital, Darlinghurst, New South Wales, Australia

      1981

      St.Bartholomew's Hospital, London, England

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      Sample of concepts for which KEVIN J HELLESTRAND is among the top experts in the world.
      Concept World rank
      successful pacing sequence #2
      effective versatile form #2
      incorporated retain #2
      tachycardia extrastimuli #2
      implantation sustained episodes #2
      extrastimuli inwards #2
      initial experience scanning #2
      inwards tachycardia #2
      termination fully #2
      tachycardia memory #2
      scanning extrastimulus pacemaker #2
      ventricular revert tachycardia #2
      flecainide administration increase #3
      flecainide acute threshold #3
      developed proarrhythmic #3
      sustained episodes tachycardia #3
      methods strauss #3
      normal flecainide #3
      1398 1455 #3
      flecainide acetate review #3
      series proarrhythmic #3
      159 strauss method #3
      flecainide acute termination #3
      recurrent fascicular tachycardia #3
      flecainide atrial tachycardia #3
      pacemaker thresholds #3
      152 patients period #3
      reentrant tachycardias flecainide #3
      narula method #3
      acetate sinus #3
      administered tachycardia #3
      tachycardias flecainide #3
      acute threshold maximum #3
      292 931 276 #3
      patient sinoatrial #3
      coupling time stimuli #4
      minutes 47 patients #4
      extrastimulus occurs #4
      widening patient #4
      dual pathways flecainide #4
      flecainide fast pathway #4
      administration reinitiation #4
      tachycardia pacemaker implantation #4
      fast pathway block #4
      reentrant junctional #4
      cardiac cycle extrastimuli #4
      pa interval interval #4
      scanned coupling #4
      delay flecainide #4
      tachycardia trigger rate #4
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      Prominent publications by KEVIN J HELLESTRAND

      KOL-Index: 12499

      Intravenous flecainide acetate was administered to 33 patients undergoing routine electrophysiologic study: 18 patients had a direct accessory atrioventricular (AV) pathway and 15 patients had functional longitudinal A-H dissociation (dual A-H pathways). Flecainide was given to 14 patients during sustained AV reentrant tachycardia and to 9 patients during sustained intra-AV nodal reentrant tachycardia. AV reentrant tachycardia was successfully terminated in 12 of 14 patients. Tachycardia ...

      Known for Flecainide Acetate | Accessory Pathway | Patients Tachycardia | Electrophysiologic Effects | Anterograde Retrograde
      KOL-Index: 8707

      The electrophysiological effects of flecainide acetate (2 mg/kg as an intravenous infusion over five minutes) were assessed in 47 patients undergoing electrophysiological study. Seven patients had normal electrophysiology, 16 had a direct accessory atrioventricular pathway, 12 had dual atrioventricular nodal (AH) pathways, five had paroxysmal ventricular tachycardia, six had conduction system disease, and one patient had a left atrial tachycardia. No significant change occurred in sinus ...

      Known for Flecainide Acetate | Electrophysiological Effects | Cardiac Conduction | Qt Interval | Ventricular Arrhythmias
      KOL-Index: 8024

      Thirteen patients suffering from reentrant supraventricular tachycardia have undergone implantation of a scanning extrastimulus pacemaker. This pacemaker is fully implanted and automatic, and it requires no external control device to activate or control it. The pacemaker is activated when tachycardia occurs. After four cycles an extrastimulus is induced with a preset coupling time from a sensed intracardiac potential, and every four cycles thereafter a further extrastimulus occurs, but ...

      Known for Termination Tachycardia | Scanning Pacemaker | Implantation Patients | Implantable Automatic | Coupling Intervals
      KOL-Index: 7843

      The function of both the denervated donor and innervated recipient sinus nodes of 14 asymptomatic cardiac transplant recipients was assessed. Tests of sinoatrial function were performed in 14 donor and 10 recipient atria. The mean spontaneous cycle length of the recipient atria was significantly longer than that of the donor atria (944 +/- 246 versus 663 +/- 158 ms, p less than 0.01). Donor sinus node recovery time was prolonged in four patients (greater than 2,500 ms in two) and ...

      Known for Cardiac Transplantation | Recipient Atria | Recovery Time | Sinus Node | Heart Rate
      KOL-Index: 7089

      Flecainide acetate, a new potent class I antiarrhythmic agent, was given to 152 patients (46 orally and 106 intravenously) over a period of 22 months. Seven patients developed proarrhythmic effects. The only conduction abnormalities induced were PR interval prolongation and QRS complex widening, and no patient developed significant sinus bradyarrhythmias; patients with known serious abnormalities of impulse generation or conduction were excluded from this study. Five patients developed ...

      Known for Proarrhythmic Effects | Flecainide Acetate | Antiarrhythmic Agent | Patients Ventricular Tachycardia | Ventricular Arrhythmias
      KOL-Index: 6911

      Intravenous flecainide acetate (2 mg/kg) was administered to 40 patients undergoing routine electrophysiological evaluation for the investigation of recurrent paroxysmal tachycardias. Ten patients had recurrent atrial flutter, 11 patients had recurrent atrial fibrillation, one of whom also had paroxysmal left atrial tachycardia, and 19 patients had recurrent ventricular tachyarrhythmias (17 with recurrent ventricular tachycardia and 2 with recurrent fascicular tachycardia). Flecainide ...

      Known for Flecainide Acetate | Atrial Fibrillation | Sinus Rhythm | Ventricular Tachycardia | 40 Patients
      KOL-Index: 6909

      The electrophysiological effects of intravenous sotalol hydrochloride (0.4 mg/kg) were assessed in 24 patients, including 13 with the Wolff-Parkinson-White syndrome, undergoing routine electrophysiological study. Fifteen to 30 minutes after sotalol administration there was a significant increase in sinus cycle length and in sinus node recovery time. There was a small increase in the AH interval, but the HV interval was unchanged. The QT and JT intervals, measured during sinus rhythm, ...

      Known for Electrophysiological Effects | Beta Blocker | Patients Sotalol | Accessory Pathway | Sinus Rhythm
      KOL-Index: 6371

      The acute electrophysiologic effects of i.v. flecainide acetate (2 mg/kg body weight) were assessed in 71 patients undergoing electrophysiologic study. Ten patients underwent investigation for sinus node dysfunction. Sinus cycle length shortened slightly, from 980 +/- 292 to 931 +/- 276 ms (p less than 0.01). Uncorrected or corrected sinus node recovery times or sinoatrial conduction time (according to the methods of Strauss and Narula) did not change in 6 patients with normal sinus node ...

      Known for Flecainide Acetate | Electrophysiologic Effects | Sinus Node Function | Acute Termination | Accessory Pathway
      KOL-Index: 5328

      Flecainide acetate depresses both the upstroke of the intracellular action potential and the rate of diastolic depolarisation in isolated tissue preparations of atrial myocardium. It produces no consistent effect on action potential duration. Predictably, in the human heart, studied by clinical cardiac electrophysiological techniques, conduction velocity through atrial myocardium, the atrioventricular (AV) node and anomalous tissue is depressed following flecainide administration. ...

      Known for Flecainide Acetate | Atrial Tachycardia | Supraventricular Arrhythmias | Small Proportion | Atrioventricular Node
      KOL-Index: 4958

      To evaluate the direct electrophysiologic effects of i.v. disopyramide phosphate and to differentiate these effects from its autonomically mediated actions, we administered the drug (2 mg/kg over 5 minutes) during electrophysiologic study to eight cardiac transplant recipients who had documented functional cardiac denervation. After disopyramide, the cycle length of the denervated donor right atrium increased from 626 +/- 129 to 716 +/- 148 msec (mean +/- SD, p less than 0.001), whereas ...

      Known for Transplanted Human Heart | Electrophysiologic Effects | Qt Interval | Cycle Length | Qrs Duration
      KOL-Index: 4501

      A fully implantable automatic scanning pacemaker designed for tachycardia termination has been used in three patients with regular paroxysmal supraventricular tachycardia. The pacemaker recognizes tachycardia and delivers one or two extrastimuli which automatically scan inwards if tachycardia continues. A memory is incorporated to retain and immediately reuse a successful pacing sequence if tachycardia recurs. Ventricular pacing has been used in two patients and atrial stimulation in ...

      Known for Tachycardia Termination | Frequent Attacks | Aged Pacemaker | Implantable Scanning | White Syndrome
      KOL-Index: 4241

      Twenty consecutive patients with paroxysmal intra A-V nodal or atrio-ventricular tachycardia had a new tachycardia reversion pacing modality evaluated during routine electrophysiological study. The pacing was controlled by a micropressor interfaced with a stimulator connected to a right atrial pacing electrode. On detection of tachycardia the first pacing cycle interval is equal to the tachycardia cycle length minus a decrement value D. Each subsequent pacing cycle is further reduced by ...

      Known for Atrial Pacing | Artificial Tachycardia | Unwanted Arrhythmias | Heart Ventricles | Evaluation Studies
      KOL-Index: 3762

      It is usual to record independent activity from both the innervated recipient and the denervated donor atria in cardiac transplant recipients except for occasional, short-lived periods of entrainment that may occur during exercise. In this report a case is described in which, following orthotopic cardiac transplantation, the recipient and donor atria remained synchronized during a variety of physiological and non-physiological situations. Under no circumstances did the two sets of atria ...

      Known for Recipient Atria | Cardiac Transplant | Rate Heart | Node Adult | Denervated Donor

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      From the Department of Cardiology, St. Bartholomew's Hospital, London, England, and the Department of Cardiology, Royal North Shore Hospital, Sydney, Australia | Department of Cardiology, St. Bartholomew’s Hospital, West Smith-field, EC1A 7BE, London

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