title: Difference in percentage of ventricular pacing between two algorithms for minimizing ventricular pacing: results of the IDEAL RVP (Identify the Best Algorithm for Reducing Unnecessary Right Ventricular Pacing) study.
abstract: OBJECTIVE
  Managed ventricular pacing (MVP) and Search AV+ are representative dual-chamber pacing algorithms for minimizing ventricular pacing (VP). This randomized, crossover study aimed to examine the difference in ability to reduce percentage of VP (%VP) between these two algorithms.
  
  
  RESULTS
  Symptomatic bradyarrhythmia patients implanted with a pacemaker equipped with both algorithms (Adapta DR, Medtronic) were enrolled. The %VPs of the patients during two periods were compared: 1 month operation of either one of the two algorithms for each period. All patients were categorized into subgroups according to the atrioventricular block (AVB) status at baseline: no AVB (nAVB), first-degree AVB (1AVB), second-degree AVB (2AVB), episodic third-degree AVB (e3AVB), and persistent third-degree AVB (p3AVB). Data were available from 127 patients for the analysis. For all patient subgroups, except for p3AVB category, the median %VPs were lower during the MVP operation than those during the Search AV+ (nAVB: 0.2 vs. 0.8%, P < 0.0001; 1AVB: 2.3 vs. 27.4%, P = 0.001; 2AVB: 16.4% vs. 91.9%, P = 0.0052; e3AVB: 37.7% vs. 92.7%, P = 0.0003).
  
  
  CONCLUSIONS
  Managed ventricular pacing algorithm, when compared with Search AV+, offers further %VP reduction in patients implanted with a dual-chamber pacemaker, except for patients diagnosed with persistent loss of atrioventricular conduction.
authors.affiliation: Cardiovascular Center, Higashi Municipal Hospital, City of Nagoya, 1-2-23 Wakamizu, Chikusa-ku, Nagoya 464-8547, Japan. yhyvilla@aol.com
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Murakami
authors.forename: Naoya
authors.initials: N
authors.lastname: Tsuboi
authors.forename: Yasuya
authors.initials: Y
authors.lastname: Inden
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Toyoaki
authors.initials: T
authors.lastname: Murohara
authors.forename: Zenichi
authors.initials: Z
authors.lastname: Ihara
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Takami
mesh_terms: D000368:Aged; D000465:Algorithms; D001919:Bradycardia / Q000150:complications / Q000175:diagnosis* / Q000517:prevention & control*; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D018592:Cross-Over Studies; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D013813:Therapy, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome; D018487:Ventricular Dysfunction, Left / Q000175:diagnosis* / Q000209:etiology / Q000517:prevention & control*