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Pacing Impedance Variability in Tined Steroid Eluting Leads
Author(s) -
DANILOVIC DEJAN,
OHM OLEJØRGEN
Publication year - 1998
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.1540-8159.1998.tb00205.x
Subject(s) - medicine , correlation , pi , cardiology , lead (geology) , chemistry , geometry , mathematics , geomorphology , geology , biochemistry
The aim of the study was to investigate pacing impedance (PI) behavior in ambulatory patients. Eighteen atrial and 18 ventricular tined steroid eluting leads with 1.2‐mm 2 and 5.6‐mm 2 electrodes were implanted in 20 patients. At 9–27 months after implantation PI was measured automatically by means of additional algorithms downloaded via telemetry links into implanted Thera® pulse generators. PI was determined based on the voltage drop on the output capacitor during the 5 V‐1 ms pacing impulse, at the programmable sampling rates from 1 second to 30 minutes. The study examined in particular: (1) PI trends and variations associated with different breathing patterns, body postures, provocative maneuvers, bike exercise, and during 24 hours; (2) impact of pacing rate and AV‐delay on PI; (3) correlation between PI variability and pacing threshold, lead configuration, absolute PI value, age, gender, disease, and cardiac chamber. The most important findings were: (1) large PI variations of up to 450 Ω were observed in properly functioning leads, (2) PI variability exhibited a weak negative correlation with pacing thresholds as if electrode positional stability was not a major factor underlying PI variations, (3) unipolar and bipolar PI variations were equivalent to each other (correlation factor = 0.93) implying that PI was mostly dependent on the circumstances around the lead tip.