[Estimation of total body water from routine urea kinetics].
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 divided by 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 anthropometrical formula has proven as a satisfactory simple approach. Periodical BIA determination provides useful informations mainly when the anthropometrical estimation are doubtful and the comparison of data may increase the kinetic reliability.
Bosticardo
G M
GM
Servizio Dialisi, Azienda USL n. 9, Ivrea, Torino.
Alloatti
S
S
Vidano
E
E
Cestonaro
G
G
Gavassa
L
L
Scagliola
C
C
Giacchino
F
F
D000368:Aged; D000465:Algorithms; D001834:Body Water; D003955:Diagnostic Tests, Routine; D017097:Electric Impedance; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008657:Metabolic Clearance Rate; D008875:Middle Aged; D006435:Renal Dialysis; D018709:Statistics, Nonparametric; D014508:Urea / Q000378:metabolism*; D014511:Uremia / Q000378:metabolism* / Q000628:therapy
D014508:Urea
La stima dell'acqua corporea totale per la cinetica dell'urea di routine.