Chronic rise in monophasic defibrillation thresholds with a transvenous lead system.
This study was a prospective evaluation of chronic changes of defibrillation thresholds in 31 clinically stable patients with a single transvenous lead, optimal shock polarity, and uniform testing protocol. At a mean follow-up of 273 +/- 146 days, defibrillation thresholds increased 26%, from 13.2 +/- 5.6 J to 17.1 +/- 6:0 J (p < 0.001), and shock impedance increased from 46.2 +/- 7.0 omega to 51.2 +/- 6.2 omega (p < 0.001).
Kirk
M M
MM
Department of Medicine, University of Maryland Medical System, Baltimore, USA.
Shorofsky
S R
SR
Khalighi
K
K
Kavesh
N G
NG
Peters
R W
RW
Gold
M R
MR
D000368:Aged; D017147:Defibrillators, Implantable; D004554:Electric Countershock / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013997:Time Factors