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Threshold and Polarization Properties of Modern Active Fixation Atrial Leads
Author(s) -
KINDERMANN MICHAEL,
SCHWERDT HOLGER,
FRÖHLIG GERD,
SCHIEFFER HERMANN
Publication year - 1992
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1992.tb03004.x
Subject(s) - omega , medicine , polarization (electrochemistry) , physics , chemistry , quantum mechanics
The purpose of the study was to compare the stimulation characteristics of two modern active fixation leads (E1a 583F, vitreous carbon tip [ELA] and Intermedics 82–0008–1601, iridium oxide tip [IROX]) with a standard lead (Osypka KY 67 VC, carbon‐covered elgiloy tip [OSY]). In three groups of ten patients each, minimum charge threshold δQ min and polarization properties were determined via charge telemetry of the pacemaker (Intermedics Cosmos II and Relay) 0, 2, 5, 10, 28, 90, and 180 days after implant (dai). The polarization parameters global capacitance C g , global resistance R g , polarization voltage U p , and a time constant t* (t*= C g ? R g ) were obtained by nonlinear regression. U p was always significantly (sig) lower in ELA and IROX (0.04–0.10 V) compared to OSY (0.54–0.76 V). R g was sig lower in ELA (330–437 Ω) compared to OSY and IROX (414–588 Ω) from 0 to 28 dai. From 2 to 10 dai, C g was sig higher in ELA and IROX (3.8–4.2 μF) compared to OSY (3.3–3.4 μF). In the three groups, BQ min reached a comparable maximum (1–1.2 μC) at 5 dai. Therefore, vitreous carbon and iridium oxide atrial fixation leads exhibit low chronic polarization effects compared to a standard elgiloy lead, but do not show a sig reduction in charge threshold.