title: Underestimation of pacing threshold as determined by an automatic ventricular threshold testing algorithm.
abstract: In this case report, we describe markedly different pacing thresholds determined by a manual threshold test and the automatic Ventricular Capture Management algorithm. The discrepancy in pacing threshold values reported was due to the difference in the AV intervals used with the different testing methods. We propose that the differences in right ventricular dimensions with altered diastolic filling periods affected the threshold in this patient with a new passive fixation lead in the right ventricular apex.
authors.affiliation: Division of Cardiology, University of Colorado at Denver and Health Sciences Center, Denver, Colorado, USA. william.sauer@uphs.upenn.edu
authors.forename: William H
authors.initials: WH
authors.lastname: Sauer
authors.forename: Joshua M
authors.initials: JM
authors.lastname: Cooper
authors.forename: Rebecca W
authors.initials: RW
authors.lastname: Lai
authors.forename: Ralph J
authors.initials: RJ
authors.lastname: Verdino
mesh_terms: D000368:Aged; D000465:Algorithms; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004562:Electrocardiography / Q000379:methods*; D004868:Equipment Failure; D019544:Equipment Failure Analysis; D006327:Heart Block / Q000175:diagnosis* / Q000517:prevention & control; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D013813:Therapy, Computer-Assisted / Q000379:methods*