title: Chronic rise in monophasic defibrillation thresholds with a transvenous lead system.
abstract: 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).
authors.affiliation: Department of Medicine, University of Maryland Medical System, Baltimore, USA.
authors.forename: M M
authors.initials: MM
authors.lastname: Kirk
authors.forename: S R
authors.initials: SR
authors.lastname: Shorofsky
authors.forename: K
authors.initials: K
authors.lastname: Khalighi
authors.forename: N G
authors.initials: NG
authors.lastname: Kavesh
authors.forename: R W
authors.initials: RW
authors.lastname: Peters
authors.forename: M R
authors.initials: MR
authors.lastname: Gold
mesh_terms: 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