In patients allocated to the active arm of the study, any decision about weight reduction will be taken by Nephrologists only on the basis of pre-dialysis US-scans. However, also post-dialysis US-B lines measurement must be performed and registered. In the active and in the control arm as well, US-scans will be performed by the local cardiologist in coincidence with the echocardiographic study. It is crucial for the purpose of this study that cardiologists keep nephrologists involved in the LUST study blinded with respect to the number of US-B lines of patients of the control group.