Abstract
Purpose
Multisite cardiac resynchronization therapy (MSCRT) with dual-vein left ventricular (LV) pacing has theoretical advantages over conventional CRT in faster and more physiological LV activation. We aimed to define indications, feasibility, safety, acute, and long-term results of MSCRT.
Methods
All patients implanted with MSCRT during 2008–2014 in a single center were reviewed and analyzed.
Results
Thirty-nine patients (90% CRT-defibrillators, 64 ± 9 years, 85% male, 74% ischemic etiology) were included. Four groups of indications were recognized: (1) significant tricuspid regurgitation (TR) in patients planned for device implantation without right ventricular lead (n = 3). Follow-up (f/u) of 4 ± 3 years showed major symptomatic improvement in all, with stable LV size and function and deferral of valve surgery; (2) severe heart failure with reduced ejection fraction (HFrEF) and refractory ventricular tachycardia (VT) (n = 4). Except for 1 early death for acute renal failure, all others showed no VT episodes and HF improvement (f/u 4.5 ± 0.5 years); (3) severe HFrEF and wide QRS (≥ 150 ms) or failure of biventricular pacing to narrow QRS during implantation (n = 5). One patient had periprocedural mortality. The others had major clinical improvement; (4) severe HF and narrow QRS/RBBB (n = 27). 23/24 patients with available f/u of 3 ± 1.7 years improved clinically and 57% had EF improvement. In 3 patients, LV1 was disabled and one had LV2 dislodgement.
Conclusions
MSCRT is feasible, safe, and valuable in selected patients with a need to avoid RV lead during device implantation, refractory VT with no other solution, severe HFrEF with wide QRS or CRT non-responsiveness, and severe HF without LBBB. Randomized controlled studies are required.
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Daubert JC. Triple-site Biventricular Stimulation in the Optimization of CRT (TRIUMPH-CRT) ClinicalTrials.gov Identifier: NCT02350842.
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The study was approved by the local research ethics committee and all patients gave their written informed consent to the procedure.
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Laish-Farkash, A., Bruoha, S., Khalameizer, V. et al. Multisite cardiac resynchronization therapy for traditional and non-traditional indications. J Interv Card Electrophysiol 51, 143–152 (2018). https://doi.org/10.1007/s10840-018-0316-4
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DOI: https://doi.org/10.1007/s10840-018-0316-4