Pacing and clinical electrophysiology : PACE
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Pacing Clin Electrophysiol · Aug 1993
Randomized Controlled Trial Clinical TrialRandomized cross-over evaluation of two adaptive pacing algorithms for the termination of ventricular tachycardia.
In a randomized, cross-over study we evaluated the efficacy of rate adaptive constant cycle length (BURST) and autodecremental (RAMP) pacing for termination of sustained monomorphic ventricular tachycardia. ⋯ 1. Rate adaptive pacing methods for ventricular tachycardia termination are effective and safe. 2. Autodecremental RAMP pacing afford quicker ventricular tachycardia termination than constant cycle length BURST pacing. 3. The ability to terminate ventricular tachycardia is cycle length dependent with cycle length range of 300-350 msec being most responsive to pace termination.
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Pacing Clin Electrophysiol · Aug 1993
Technical and clinical problems in patients with simultaneous implantation of a cardiac pacemaker and spinal cord stimulator.
Spinal cord stimulators are used to relieve pain associated with peripheral ischemia and angina pectoris. In patients with both permanent pacemaker (PPM) and a spinal cord stimulator (SCS), electromagnetic signals from the SCS may inhibit the PPM. A bipolar PPM configuration is preferred to minimize myopotential or electromagnetic interference but patients have safely had unipolar devices implanted. ⋯ Multiprogrammable and/or bipolar PPMs should be implanted in a patient with a SCS to allow reprogramming of the PPM and to minimize the risk of inter-device interference. Inhibition of the PPM may occur at different SCS stimulation frequencies. The frequency at which inhibition occurs varies with different models of implanted pacemaker.
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Pacing Clin Electrophysiol · Aug 1993
Radiofrequency catheter ablation of ventricular tachycardia following implantation of an automatic cardioverter defibrillator.
The present study reports on the complementary role of two nonpharmacological options of antiarrhythmic therapy. ⋯ RF catheter ablation is a complementary therapeutic option in case of frequent or incessant ventricular tachycardia after ICD implantation.
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Pacing Clin Electrophysiol · Aug 1993
Feasibility of measuring relative right ventricular volumes and ejection fraction with implantable rhythm control devices.
Ejection fraction (EF), the ratio between stroke volume (SV) and end-diastolic volume (EDV), is a valuable contractility indicator. Unlike SV, the Frank-Starling effect is automatically compensated in the calculation of EF. It was the aim of this study to evaluate the physiological behavior of impedance derived measurements of relative right ventricular (RV) volumes and EF, obtained with standard pacing leads. ⋯ A high correlation coefficient was observed between EDV and SV changes induced by incremental pacing at rest (r values from 0.62 to 0.98, P from < 0.01 to 0.001). The study revealed that impedance volumetry, utilizing conventional bipolar pacing leads, yields useful hemodynamic data related to EDV, ESV, and EF. Given the simplicity of the method, it is reasonable to conclude on the feasibility of using said impedance derived hemodynamic parameters in implantable rhythm control devices.