Effect of lead design and pacing vector on electrical parameters of quadripolar coronary sinus leads: The RALLY‐X4 study

Various lead designs have been developed to accommodate different coronary sinus anatomies. Our objectives were to compare electrical parameters of straight and spiral left ventricular leads, to evaluate capture thresholds and impedances using different pacing vectors, and to study evolution of thresholds over time.The RALLY-X4 study enrolled patients implanted with a lead from the Acuity X4 family (straight, spiral short, or spiral long)....