PMID: 6160496Jan 1, 1980Paper

A search for modulation in intermittent ventricular parasystole

Pacing and Clinical Electrophysiology : PACE
A CastellanosR J Myerburg

Abstract

As recently described by Moe et al., parasystolic modulation implies that the ectopic cycle length of a parasystolic focus can be increased or decreased by electrical influences transmitted across the zone of protection. A search for this phenomenon was made in nine patients with intermittent ventricular parasystole resulting from protection only during specific portions of the cycle. All nine patients had a period of relatively early protection affecting the initial 55-67% of the cycle preceding a period of resetting during which the parasystolic focus was discharged and fully recycled. In addition, two patients had a period of relatively late parasystolic protection. Pseudo-resetting (apparent resetting in the surface leads without interruption of activity within the parasystolic focus itself), seen throughout the entire period of late protection in these two patients, and during the relatively refractory period in one patient, was identified because the R waves causing apparent resetting were encompassed by parasystolic-to-parasystolic intervals equalling twice the ectopic cycle length. Our findings indicate that parasystolic modulation did not occur in the type of intermittent ventricular parasystole included in this study....Continue Reading

References

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Citations

Apr 1, 1984·Journal of Electrocardiology·A CastellanosR M Luceri
Jun 29, 2013·Heart Rhythm : the Official Journal of the Heart Rhythm Society·José Jalife
Apr 1, 1984·Journal of Electrocardiology·S KinoshitaT Yasukouchi
May 1, 1985·The American Journal of Cardiology·A CastellanosR J Myerburg
Apr 1, 1987·The American Journal of Cardiology·G NilssonI Ringqvist
Nov 1, 1982·Pacing and Clinical Electrophysiology : PACE·J JalifeG K Moe
Aug 1, 1984·The American Journal of Cardiology·A CastellanosR J Myerburg
Jan 1, 1982·Circulation·S KinoshitaY Tanabe
Aug 1, 1982·Circulation·G J NauM B Rosenbaum
Jul 1, 1984·Pacing and Clinical Electrophysiology : PACE·F LoperfidoF Bellocci

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