© 2002 by European Society of Cardiology
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Interatrial septum pacing avoids the adverse effect of interatrial delay in biventricular pacing: an echo-Doppler evaluation
Institute of Internal Medicine and Cardiology, University of Florence Florence, Italy
AIMS: Biventricular pacing (BVP) can improve haemodynamics in patients with dilated cardiomyopathy (DCM) and left bundle branch block by reducing interventricular delay (IVD). Since in DCM interatrial delay (IAD) and IVD frequently coexist, the aim of this study was to test the hypothesis that IVD reduction associated with IAD produces an imbalance between the programmed right atrioventricular (AV) delay and the effective AV delay on the left, and that interatrial septum pacing (IASP) combined with BVP overcomes this adverse effect.
METHODS AND RESULTS: IAD, IVD, left and right mechanical atrioventricular delay (L-RMAVD) were measured by echo-Doppler in 29 patients with BVP: 17 patients (Group A) had the atrial lead in the right atrial appendage, 12 patients (Group B) who experienced paroxysmal atrial fibrillation had the atrial lead on the interatrial septum. In Group A, LMAVD was significantly shorter than RMAVD (172±24 vs 207±24 ms, P< 0·002), IAD was significantly longer than IVD (52±24 vs 21±18 ms, P< 0·0001). In Group B, no differences were observed between LMAVD and RMAVD (187±32 vs 185±28 ms, NS), and between IAD and IVD (11±12 vs 13±16 ms, NS).
CONCLUSIONS: IAD produces different left and right atrioventricular sequences in BVP. IASP combined with BVP, by resynchronizing both atria and ventricles, is able to avoid this adverse effect.
Key Words: Biventricular pacing, atrioventricular mechanical delay, interatrial delay, interatrial septum pacing, echo-Doppler
Correspondence: Maria Cristina Porciani, MD, Institute of Internal Medicine and Cardiology, University of Florence, Florence, Italy, Viale Morgagni 85, 50134 Florence, Italy. Tel: + 39 055 4277634; Fax: + 39 055 4378638; E-mail: c.porciani{at}dfc.unifi.it
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