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MINERVA UROLOGICA E NEFROLOGICA

A Journal on Nephrology and Urology


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  XIV CONGRESS OF THE SOCIETA' ITALIANA DI NEFROLOGIA SEZIONE PIEMONTE-VALLE D'AOSTA
(Ivrea, October 5, 1996)


Minerva Urologica e Nefrologica 1998 March;50(1):115-9

language: Italian

Total body water determination for routine urea kinetics

Bosticrdo G. M. 1, Alloatti S. 4, Vidano E. 2, Cestonaro G. 2, Gavassa L. 3, Scagliola C. 1, Giacchino F. 1

1 Azienda USL n. 9 - Ivrea (Torino), Servizio Dialisi;
2 Azienda USL n. 9 - Ivrea (Torino), Laboratorio;
3 Azienda USL n. 9 - Ivrea (Torino), Dietologia;
4 Ospedale Regionale - Aosta, Servizio Dialisi


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The comparison of total body water obtained by Watson formula with results of bioelectrical impedance (BIA) shows a fair approximation (Delta%=1.0±8.45). However, when compared to other literature formulas the BIA values are higher (8÷23%), and this discrepancy needs further analysis. Urea kinetics was computed using as input data for distribution volume both the Watson anthropometrical and the BIA TBW values: the clearance results do not differ significantly (Delta%= 0.74±8.35). The Kt/V index results are nearly identical (Delta%=0.12±1.17), due to a mathematical loop: a wrong input of volume induces a comparable error of the clearance result, while their ratio is unchanged. For practical routine to monitoring dialysis adequacy the Watson antropometrical formula has proven as a satisfactory simple approach. Periodical BIA determination provides useful informations mainly when the anthropometrical extimation are doubtful and the comparison of data may increase the kinetic reliability.

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