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Table 1 Main disposables and their components with associated color code in a CRRT extracorporeal circuit (modified from [45])

From: Nomenclature for renal replacement therapy and blood purification techniques in critically ill patients: practical applications

Tubes
 Blood in-flow line (red; previously known as access or arterial line) Segment connecting the patient’s vascular access to the filter
Segment for pressure measurement (upstream blood pump): segment of the blood in-flow line connected to the in-flow pressure sensor
Pump segment line: segment inserted between the rotor and the stator of the blood pump
Blood in-flow air removal chamber: allows removal of light air bubbles before the blood enters the filter
Segment for pressure measurement (downstream blood pump): segment of the blood in-flow line connected to the pre-filter pressure sensor
 Blood out-flow line (dark blue; previously known as return or venous line) Segment connecting the filter to the patient’s vascular access
Segment for pressure measurement: segment of the blood out-flow line connected to the out-flow pressure sensor
Blood out-flow air removal chamber: allows removal of light air bubbles before the blood returns to the patient
 Effluent/ultrafiltrate line (yellow) Segment that allows the flow of waste fluids from the filter
Pump segment line: segment inserted between the rotor and the stator of the effluent/ultrafiltrate pump
Segment for pressure measurement: segment of the effluent line connected to the effluent/ultrafiltrate pressure sensor
 Dialysate line (green) Segment that allows the flow of incoming dialysate into the filter
Pump segment line: segment inserted between the rotor and the stator of the dialysate pump
Segment for pressure measurement (if present): segment of the dialysate line connected to the dialysate pressure sensor
Heater line: segment of the dialysate line placed in contact with the heater
 Replacement line (purple or light blue) Segment that allows the flow of replacement fluid into the blood in-flow and/or blood out-flow lines
Pump segment line: segment inserted between the rotor and the stator of the replacement pump
Segment for pressure measurement (if present): segment of the replacement line connected to the replacement pressure sensor
Heater line: segment of the replacement line placed in contact with the heater
 Pre-blood line (orange) Segment that allows the flow of specific fluids (mainly regional anticoagulants) into the blood in-flow line before the blood pump
Pump segment line: segment inserted between the rotor and the stator of the pre-blood pump
Segment for pressure measurement (if present): segment of the pre-blood line connected to the pre-blood pressure sensor
 Anticoagulant and specific antagonists line Segments connecting the anticoagulant/specific antagonist bag or pump to the main blood circuit
Citrate line (orange): segment for citrate infusion (i.e., pre-blood line)
Heparin line (white): segment connecting the heparin syringe pump to the blood in-flow line
Specific antagonist line (black): segment connecting the specific antagonist syringe pump to the blood out-flow line
Filter
 Fiber (membranes) Every fiber, hollow and of cylindrical shape, allows the transport of fluids and solutes through their porous semi-permeable surface
 Bundle Entire number of fibers inside the housing
 Housing Plastic casing containing a single membrane fiber bundle
Blood in-flow port: entrance port of blood entering into the filter
Blood out-flow port: exit port of blood leaving the filter
Dialysate in-flow port: entrance port of fresh dialysate
Effluent/ultrafiltrate out-flow port: exit port of waste solution
 Potting Polyurethane component fixing the bundle within the housing and embedding the bundle at both ends of the filter