STUDY LIMITATION
Although only patients implanted with HM3 have been considered and examined, to avoid bias associated with the type of device implanted, our study has several limitations. First, this is a retrospective study conducted in a single center with a limited number of patients. Second, it was not possible, given the small number of patients, to investigate the effect of the associated repair of the tricuspid valve on the outcome and the incidence of late RVF. Third, the intervals between the patient’s discharge and ramp test are variable because of different patient’s eligibility to ramp test. Finally, since the limited numbers of patients, we didn’t include in the analysis variables related to aortic valve opening and pulsatility that should be considered for further investigation.