Volume 62, Issue 3, Pages (September 2002)

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Volume 62, Issue 3, Pages 1034-1045 (September 2002) Blood volume controlled hemodialysis in hypotension-prone patients: A randomized, multicenter controlled trial  Antonio Santoro, Elena Mancini, Carlo Basile, Luigi Amoroso, Salvatore Di Giulio, Mario Usberti, Giuliano Colasanti, Giuseppe Verzetti, Alessandro Rocco, Enrico Imbasciati, Giovanni Panzetta, Roberto Bolzani, Fabio Grandi, Maurizio Polacchini  Kidney International  Volume 62, Issue 3, Pages 1034-1045 (September 2002) DOI: 10.1046/j.1523-1755.2002.00511.x Copyright © 2002 International Society of Nephrology Terms and Conditions

Figure 1 Experimental design. The 36 enrolled patients were randomly assigned to one of the two arms of the study, differing for the sequence of conventional (A) and blood volume tracking (B) dialysis techniques (ABAB or BABA, respectively), with each period lasting 4 weeks. At the end of the follow-up period 32 out of 36 patients were included in the statistical analysis because of 3 protocol violators and 1 death. Kidney International 2002 62, 1034-1045DOI: (10.1046/j.1523-1755.2002.00511.x) Copyright © 2002 International Society of Nephrology Terms and Conditions

Figure 2 Time course of the blood volume reduction (BV, %), total weight loss (WL, kg), dialysate conductivity (DC, mS/cm) and weight loss rate (WLR, L/h) during a blood volume tracking (BVT) dialysis. According to the desired time pattern for blood volume and total weight loss (the thin dashed line in 1 and 2), the weight loss rate and dialysate conductivity change time by time to reduce the error between the desired and observed values. In any case, the WLR and DC are constrained within safety limits (dotted lines). Kidney International 2002 62, 1034-1045DOI: (10.1046/j.1523-1755.2002.00511.x) Copyright © 2002 International Society of Nephrology Terms and Conditions

Figure 3 Hypotension during dialysis (top) and symptoms during the inter-dialysis period (bottom). The frequency of dialysis hypotension is reported as a whole (left; *) and within each sequence. The latter also reports the frequency during the run-in period, here indicated as the first A period before each sequence. The analysis neglecting the sequence showed a statistically significant reduction in the hypotension event rate (P = 0.004). The average number of symptoms occurring during inter-dialysis is reported as early (**) when it occurred in the first 6 hours after the end of dialysis, or as late (‡) when occurring between this time and the start of the following dialysis session. All the values are statistically significant at 1‰ level (P < 0.001). Kidney International 2002 62, 1034-1045DOI: (10.1046/j.1523-1755.2002.00511.x) Copyright © 2002 International Society of Nephrology Terms and Conditions

Figure 4 Individual frequency of the symptomatic intradialytic hypotension episodes during dialysis in blood volume tracking (BVT; B period) plotted against the frequency of the intradialytic hypotension episodes in conventional dialysis (A period). The scatter plot also shows the identity, the regression line (thick solid line; y = 0.54 x+ 5; r = 0.4, P < 0.001, 95% confidence interval for the slope ranging from 0.33 to 0.75) and the confidence limits of the mean at 95% level. Finally, the region at the right of 30% of hypotension episodes in the A period defines the highly critical patients. Kidney International 2002 62, 1034-1045DOI: (10.1046/j.1523-1755.2002.00511.x) Copyright © 2002 International Society of Nephrology Terms and Conditions

Figure 5 Percentiles and confidence intervals at 95% of the distributions of the difference between the frequency of hypotension in B minus A treatments plotted against the percentiles of the frequency of hypotension in conventional dialysis (A treatment). Kidney International 2002 62, 1034-1045DOI: (10.1046/j.1523-1755.2002.00511.x) Copyright © 2002 International Society of Nephrology Terms and Conditions

Figure 6 Time course of systolic arterial pressure (A) and heart rate (B) in the high and poor responder patients. The table below the figure reports the significance of the main factors and interaction terms for the ANOVA for repeated measures model. As concerns systolic arterial pressure, the test revealed a statistical significance between subjects (high and poor responders, P < 0.001). Treatment (A or B) did not seem to influence either systolic pressure or heart rate (P = 0.8 and P = 0.94, respectively). Kidney International 2002 62, 1034-1045DOI: (10.1046/j.1523-1755.2002.00511.x) Copyright © 2002 International Society of Nephrology Terms and Conditions