Urea Kinetic Modeling Exaggerates the Relationship between Nutrition and Dialysis in CAPD Patients. (The Hazards of Cross-Sectional Analysis)

Bergstrom J. , Furst P. , Alvestrand A. , Lindholm B. Protein and energy intake, nitrogen balance and nitrogen losses in patients treated with continuous ambulatory peritoneal dialysis. Kidney Int 1993; 44: 1048–57.

Blumenkrantz M.J. , Kopple J.D. , Moran J.K. , Cowburn J.W. Metabolic balance studies and dietary protein requirements in patients undergoing continuous ambulatory peritoneal dialysis. Kidney Int 1982; 21: 849–61.

Pollock C.A. , Allen B.J. , Warden R.A. Total body nitrogen by neutron activation in maintenance dialysis. Am J Kidney Dis 1990; 16: 38–45.

Heide B. , Pierratos A. , Khanna R. Nutritional status of patients undergoing continuous ambulatory peritoneal dialysis. Perit Dial Bull 1983; 3: 138–41.

Schilling H. , Wu G. , Pettit J. Nutritional status of patients on long term CAPD. Perit Dial Bull 1985; 5: 12–18.

Williams P. , Kay R. , Harrison J. Nutritional and anthropometric assessment of patients on CAPD over one year. Perit Dial Bull 1981; 1: 82–7.

Lindsay R.M. , Spanner E. A hypothesis: the protein catabolic rate is dependent upon the type and amount of treatment in dialysed uraemic patients. Am J Kidney Dis 1989; 13: 382–9.

Gotch F.A. The application of urea kinetic modelling to CAPD. In: LaGreca G , Ronco C. , Feriani M. , Chiaramonte S. , Conz P. , eds. Peritoneal dialysis: proceedings of the fourth international course on peritoneal dialysis. Milano: Wichtig Editore, 1991: 47–51.

Diaz-Buxo J.A. How important is the problem of malnutrition in chronic dialysis patients? Seminars in Dialysis 1992; 5: 267–9.

Watson P.E. , Watson I.D. , Batt R.D.P. Total body water volumes for adult males and females estimated from simple anthropometric measurements Am J Clin Nutr 1980; 33: 27–39.

Archie J.P. Mathematical coupling of data: a common source of error. Ann Burg 1981; 193: 296–303.

Pearson K. Mathematical contributions to the theory of evolution -on a form of spurious correlation which may arise when indices are used in the measurement of organs. Proc R Soc Lond 1987; 60: 489–97.

Harty J.C. , Faragher B. , Boulton H. Is the correlation between NPCR and KTN the result of mathematical coupling. Clin Bci 1994; 86: 30P.

Harty J.C. , Boulton H. , Curwell J. The normalised protein catabolic rate is a flawed marker of nutrition in CAPD patients. Kidney Int 1994; 45: 103–9.

Harty J.C. , Boulton H. , Uttley L. , Heelis N. , Venning M. , Gokal R. Limitations of urea kinetic modelling as predictors of nutritional and dialysis adequacy in CAPD. Am J Nephrol 1993; 13: 454–63.

Gotch F. Dependence of normalised protein catabolic rate on KTN in continuous ambulatory peritoneal dialysis: not a mathematical artefact. Perit Dial Int 1993; 13: 173–5.

Stein A. , Walls J. The correlation between KTN and protein catabolic rate-a self-fulfilling prophecy. Nephrol Dial Transplant 1994; 9: 743–5.

Mactier R.M. , Perry M. , Henderson I.S. Relationships between dialysis quantification and normalised protein catabolic rate in peritoneal dialysis. Perit Dial Int 1992; 12(Suppl 2): S508–S511.

Lindsay R.M. , Spanner E. , Heidentreim R.P. Which comes first, KTN or PCR-Chicken or egg? Kidney Int 1992; 42(Suppl 38): S32–S36.

Goodship T.H.J. , Passlick-Deetjen J. , Ward M.K. , Wilkinson R. Adequacy of dialysis and nutritional status in CAPD. Nephrol Dial Transplant 1993; 8: 1366–71.

Faller B. , Lameire N. Evolution of clinical parameters and peritoneal function in a cohort of CAPD patients followed over 7 years. Nephrol Dial Transplant 1994; 9: 280–6.

Blake P.G. , Sombolos K. , Abraham G. Lack of correlation between urea kinetic indices and clinical outcomes in CAPD patients. Kidney Int 1991; 39: 700–6.

Selgas R. , Bajo M.A. , Fernandez-Reyes M.J. An analysis of adequacy of dialysis in a selected population on CAPD for over 3 years: the influence of urea and creatinine kinetics. Nephrol Dial Transplant 1993; 8: 1244–53.

Young G.A. , Kopple J.D. , Lindholm B. Nutritional assessment of continuous ambulatory peritoneal dialysis: an international study. Am J Kidney Dis 1991; 17: 462–71.