Europace Advance Access originally published online on February 13, 2008
Europace 2008 10(4):502-504; doi:10.1093/europace/eun026
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RESYNCHRONISATION THERAPY
Triangle ventricular pacing in a non-responder to conventional bi-ventricular pacing
1 Cardiovascular Division, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Ibaraki, Japan; 2 Cardiology Division, Tokyo Medical and Dental University, Tokyo, Japan
A 56-year-old man with cardiomyopathy secondary to myotonic dystrophy and complete atrioventricular block presented to our institution. A cardiac resynchronization therapy (CRT) device (InSync 8040, Medtronic, Inc., Minneapolis, MN, USA) was implanted by a conventional bi-ventricular pacing (Bi-V) technique. However, the patients NYHA class did not improve from class IV despite optimized medical therapy. One month after the CRT device implantation, we altered the pacing configuration from that of Bi-V to triangle ventricular pacing (Tri-V), i.e. conventional Bi-V from the right ventricular (RV) apex and left ventricle plus additional pacing from the RV outflow tract, using a Y connector to bifurcate the RV bipolar output of the device into an anode and a cathode. In both the acute and 3 month follow-up studies, objective parameters revealed better resynchronization effects with Tri-V, and the patients NYHA class immediately improved to class II. Triangle ventricular pacing may have the potential to decrease the number of non-responders to CRT.
Key Words: Resynchronization, Heart failure, Pacing
* Corresponding author. Tel: +81 29 853 3142; fax: +81 29 853 3143. E-mail address: kentaroyo{at}nifty.com
Manuscript submitted 28 November 2007. Accepted after revision 14 January 2008.