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Are Plasma Natriuretic Peptide Levels Influenced by Automatic Pacemaker Algorithms for Ventricular Pacing Minimization?

Authors


  • Conflict of interest: C.K. has received lecture fees from Biotronik, Boston Scientific, Medtronic, Sorin, and St. Jude Medical; is or was an advisor to Biotronik, Sorin, and St. Jude Medical; and has performed clinical trials supported by Biotronik, Medtronic, Sorin, and St. Jude Medical. As of Jan 1, 2012, J.K. is employed by Boehringer Ingelheim Pharma GmbH & Co. KG. Other authors reported no potential conflicts of interest.

  • Funding source: The study was supported by Biotronik SE & Co KG (Woermannkehre 1, D-12359 Berlin, Germany).

Address for reprints: Priv.-Doz. Dr. med. Christof Kolb, Deutsches Herzzentrum München, Lazarettstr. 36, 80636 München, Germany. Fax: +49-89-1218-4593; e-mail: Kolb@dhm.mhn.de

Abstract

Background

Automatic atrioventricular search hysteresis (AVSH) is designed to reduce the cumulative percentage of potentially deleterious right ventricular apical pacing (VP%) in dual-chamber pacemakers. We investigated whether minimizing VP% by AVSH can, in turn, reduce ventricular wall stretching/stress, as assessed by plasma concentrations of the amino-terminal fragment of the pro-B-type natriuretic peptide (NT-proBNP).

Methods

After dual-chamber pacemaker implantation in 81 patients (age: 69 ± 11 years; males: 55.6%), the fixed atrioventricular delay of 225 ms was programmed and AVSH was turned off for 1 month. The patients were thereafter randomly assigned to standard AVSH for 1 month, followed by an enhanced AVSH for another month, or vice versa. At the 1-, 2-, and 3-month follow-ups, VP% values were retrieved from the pacemaker memory, and venous blood samples were taken for NT-proBNP measurements.

Results

Both standard and enhanced AVSH reduced the median VP% value from 38.5% (for the fixed atrioventricular delay) to 2.1% (P < 0.001). However, plasma NT-proBNP concentrations for the fixed atrioventricular delay (median, 253 pg/mL), standard AVSH (225 pg/mL), and enhanced AVSH (276 pg/mL) did not differ significantly on the intrapatient basis (paired Wilcoxon tests) between any pair of these modalities.

Conclusion

Minimizing ventricular pacing by AVSH during 1 month had no influence on plasma NT-proBNP levels (i.e., ventricular wall stretching/stress) compared with a constant, moderately prolonged atrioventricular delay.

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