1. Intracardiac conduction time as a predictor of cardiac resynchronization therapy response: Results of the BIO|SELECT pilot study
- Author
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Kenji Shimeno, Hiroto Sasaki, Masatsugu Ohe, Akihiko Yotsukura, Kazuyasu Yoshitani, Nobuhisa Hagiwara, Yusuke Kondo, Shingo Sasaki, Juergen Schrader, Kazumasa Adachi, Tomoo Harada, Kyoko Soejima, I Morishima, Manabu Fujimoto, Hiroshi Tasaka, Nobuhiro Nishii, Kengo Kusano, Ritsushi Kato, Fumiharu Miura, and Kenji Ando
- Subjects
medicine.medical_specialty ,Cardiac resynchronization therapy (CRT) ,Quadripolar left ventricular lead ,Ejection fraction ,business.industry ,medicine.medical_treatment ,Interventricular electrical delay ,Cardiac resynchronization therapy ,Left ventricular end-systolic volume ,Patient response ,Intracardiac injection ,Nyha class ,Composite benefit index ,Clinical ,medicine.anatomical_structure ,Ventricle ,Internal medicine ,CRT response ,medicine ,Cardiology ,Hospital discharge ,business ,Conduction time ,Implantable Devices - Abstract
Background Quadripolar left ventricular (LV) leads are capable of sensing and pacing the left ventricle from 4 different electrodes, which may potentially improve patient response to cardiac resynchronization therapy (CRT). Objective We measured 3 different time intervals: right ventricular (RV)-sensed to LV-sensed during intrinsic rhythm (RVs-LVs), RV-paced to LV-sensed (RVp-LVs), and LV-paced to LV-sensed (LVp-LVs, between distal [LV1] and proximal pole on a quadripolar LV lead), and assessed their association with CRT response in terms of LV end-systolic volume (LVESV) and a composite benefit index (CBI) comprising LVESV, LV ejection fraction (LVEF), brain natriuretic peptide level, and NYHA class. Methods A CRT-defibrillator system with quadripolar LV lead was implanted in 196 patients (mean age 69 years, mean LVEF 30%, left bundle-branch block [LBBB] 58%). Conduction intervals were measured before hospital discharge. At baseline and 7-month follow-up, echocardiographic and other components of CBI were determined. Results The mean RVs-LV1s, RVp-LV1s, and LVp-LVs delays were 68 ± 38 ms, 132 ± 34 ms, and 99 ± 31 ms, respectively. From baseline to 7 months, LVESV decreased by 17.3% ± 28.6%. The RVs-LV1s interval correlated stronger with CBI (R2 = 0.12, P < .00001) than with LVESV change (R2 = 0.05, P = .006). In contrast, RVp-LV1s did not correlate and LVp-LVs correlated only weakly with CRT response. The subgroup of patients (44%) with LBBB and RVs-LV1s above the lower quartile (≥34 ms) showed the greatest response to CRT. Conclusion The RVs-LVs interval during intrinsic rhythm is relevant for CRT success, whereas RVp-LVs and LVp-LVs intervals did not predict CRT response.
- Published
- 2021