Edefonti A, Picca M, Consalvo G, Ghio L, Carcano A, Dalcol A,
Galato R
Formula to calculate nitrogen losses in patients treated with
chronic peritoneal dialysis
Am Soc Nephrol
J Am Soc Nephrol (abstract)
(Nov) 6:576 1995
Edefonti et al measured total nitrogen as well as urea excreted in dialysate,
urine, and feces in 27
children (mean age 11 years) to derive a formula to estimate nitrogen
balance. It must be
underlined, however,
that this formula was derived based only on data in children and thus
needs to be confirmed in adults. Below is their formula:
tND = 1.1 NDurea+0.6
tNU = 1.1 NUurea+0.035
tNF = 0.9 BSC-0.1
therefore :
tN losses (g/kg/day) = tND+tNU+tNF
Where : tND = dialysate nitrogen excretion, tNU = urine nitrogen excretion,
TNF = fecal nitrogen excretion, NDurea = dialysate urea excretion, NUurea =
urine urea excretion, BSC = body surface. tN = total nitrogen losses per
day.
(Verger)
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Am Soc Nephrol
Basic peritoneal dialysis :
Chronic PD regimens, adequacy, modeling