Objectives
pain, venous diameter/area reduction, veno-occlusive disease, tCDC
PNEUMOTHORAX, COMPLICATIONS, VENO-OCCLUSIVE DISEASE

To determine if the incidence of post-catheterisation CVS detected by a CT venography performed 1.5–3 months after removal of the tCDC is non-inferior when the right subclavian route is used as compared to the right internal jugular routeTo compare the performance of a focused ultrasound examination of the central veins to detect CVS with a CT venography (golden standard) with a threshold of50% venous diameter/area reduction (corresponding to moderate CVS in this study), as this is the commonly used definition of CVS [80% venous diameter/area reduction (corresponding to severe CVS in this study), as it has been suggested that the severity of central veno-occlusive disease must reach a diameter reduction around 80% before upstream changes in blood flow are detectable by current Doppler techniques [To compare the patients’ experience of discomfort and pain between the groupsDuring the catheterisation, using a questionnaire (Additional file When carrying the catheter, using a questionnaire (Additional file To compare the function of the tCDC during dialysis or plasmapheresis between the groups, using a questionnaire filled out by the dialysis nurse after each treatment session. The questionnaire (Additional file To compare the catheterisation success rate (defined as catheter tip placement in the right atrium or in the superior vena cava with the catheter aligned with the vessel) between the two groups using a post-procedural chest x-rayTo compare the number of mechanical complications (defined as arterial puncture/catheterisation and pneumothorax) between the groups