"Machines and membranes" Stefano Picca, MD Department of Nephrology and Urology, Dialysis Unit “Bambino Gesù” Pediatric Research Hospital, IRCCS ROMA, Italy
MACHINES AND MEMBRANES: BASIC NEEDS IN CHILDREN Machines/circuits: Accuracy and precision Circuit low priming volume Circuit inner pressures and resistance suitable for small catheters use Membranes: Filtration Absorption
Dear Tim, as far as I know this is the first patient treated with CAVH in the world. We performed this treatment in Vicenza in 1984 and the patient survived. After that we published the first series of 4 newborns treated with CAVH (Kidney International 1986) . You made a great deal of progress since then and even more with this meeting. Best Wishes Claudio Ronco
Error up to 12.5% 2 pumps (pre-post filter)= error up to 25%
Equaline® Amicon, 1991
Baxter BM25 Baxter Aquarius Baxter- Gambro Prisma Baxter- Gambro Prismaflex
SYNTHETIC MEMBRANES Symmetric Asymmetric Isotropes Anisotropes (microporous) Asymmetric Isotropes (uniform pores dimension) Anisotropes (non-uniform pores dimension) “skin layer” + highly porous supportive layer
Skin
REMOVAL OF SOLUTES AND MEDIATORS Filter cutoff CONVECTION/DIFFUSION ABSORPTION ß2 microglobulin myoglobin creatinine inulin IL-6 urea sucrose IL-8 albumin ionic compounds Vit B12 IL-1 TNF 101 102 103 104 105 MW (Daltons)
ABSORPTION Electrical Mechanical Binding binding In both cases, absorption depends on: Qb Quf Qd Surface Initial concentration Neri, 2012
HEMO(DIA)FILTERS IN NEWBORNS AND CHILDREN: PAST AND PRESENT MANUF. FILTER SURFACE (m2) MEMBRANE PRIMING (ml) Gambro-Hospal Miniflow10 0.045 AN69 3.5 Amicon, then Minntech Minifilter 0.07 Polysulfone 6 Bellco Carpediem 1 0.075 27.2 (circuit) Carpediem 2 0.147 33.5 (circuit) Carpediem 3 0.245 41.5 (circuit) Baxter-Gambro HF20 0.2 Polyarylether- sulfone (PAES) 60 (kit) Baxter-Edwards HF03 0.3 38 ST60 0.6 93 (kit) HF07 0.7 54 ST100 1.0 149 (kit)
ACKNOWLEDGEMENTS All Dialysis Unit nurses All PICU and CICU doctors and nurses Tim Bunchman, Stu Goldstein and Claudio Ronco for precious advices and friendship through the years .
Dialysis Unit, “Bambino Gesù” Pediatric Hospital Roma, Italy. Doctor: S. Picca Headnurse: V. Bandinu Nurses: N. Avari D. Ciullo E. Iacoella P. Iovine P. Lozzi L. Stefani Nurse Coordinator: M. D’Agostino