Aim: To assess the value of everyday monitoring of the percentage of cardiac resynchronization (CRT-D) with the use of remote monitoring. Methods: Prospective, single-center registry encompassed 305 consecutive heart failure (HF) patients who were implanted with CRT-D devices and subsequently monitored on a daily basis via remote monitoring for the median of 20.5 months. Every tele-transmission was screened for the percentage of CRT pacing and the special impact was put on: – immediate detection of low CRT pacing episodes – early correction of any condition leading to low CRT pacing (i.e. medical therapy optimization, device reprogramming, ablation procedures). In accordance with ESC guidelines, in which low CRT pacing was defined as ≤95% despite optimal medical therapy, study population was divided into three groups: – Group 1 – CRT>95% throughout the whole FU – Group 2 – CRT>95%, however, with episodes of low CRT pacing during FU – Group 3 – CRT≤95% throughout the whole FU Results: Long-term mortality and mean CRT pacing for the whole study population was 11.4% and 95.22% respectively. Although, the CRT pacing ≤95% appeared to be the independent risk factor for death [HR 0.34, p 95% improves outcomes. On the other hand, failure in achievement of optimal CRT>95% despite optimized treatment leads to 2 fold increase in HF hospitalizations and over 3 fold increase in mortality. The most important reasons for low CRT were atrial fibrillation (AF), premature ventricle contractions (PVCs) and supraventricular tachycardia (SVT) [46, 39 and 13% respectively]. View this table: Table 1 Conclusions: Continuous remote monitoring of the percentage of CRT pacing facilitates maintenance as well as regaining the optimal CRT pacing and thus reduces HF hospitalizations and increases survival.