Table 2.
Characteristics of the dialysis prescriptions at baseline
| Baseline Characteristic | All Patients (N=66) | Baseline Dialysate Recorded (n=62) | Baseline DBIC <35 (n=15) | Baseline DBIC=35 (n=27) | Baseline DBIC >35 (n=20) | P Valuea |
|---|---|---|---|---|---|---|
| Duration of hemodialysis, h | 4.0 (3.5–4.0) | 4.0 (3.5–4.0) | 4.0 (4.0–4.0) | 3.7 (3.5–4.0) | 3.6 (3.5–4.0) | 0.02 |
| spKt/V | 1.5±0.4 | 1.5±0.3 | 1.5±0.3 | 1.4±0.3 | 1.5±0.3 | 0.53 |
| Predialysis weight, kg | 86.7±28.8 | 88.5±28.8 | 72.4±16.8 | 85.3±19.1 | 104.7±38.2 | <0.01 |
| Kilogram over dry weight target before dialysis | 4.2 (2.7–5.2) | 4.3 (2.8–5.5) | 3.9 (2.3–4.8) | 4.3 (2.3–5.0) | 4.9 (3.5–6.9) | 0.01 |
| UFR, ml/kg per hour | 12±6 | 12±6 | 12±6 | 11±5 | 13±6 | 0.64 |
| Dialysate flow, ml/min | 600 (500–800) | 600 (500–800) | 500 (500–800) | 600 (500–800) | 600 (600–800) | 0.20 |
| Blood flow, ml/min | 387 (300–467) | 400 (300–475) | 314 (294–500) | 375 (300–400) | 471 (407–500) | <0.001 |
| High-flux dialyzer, No. (%) | 42 (64) | 41 (66) | 7 (47) | 15 (56) | 19 (95) | <0.01 |
| Membrane reuse, No. (%) | 18 (27) | 17 (27) | 1 (7) | 11 (41) | 5 (25) | 0.06 |
| Cellulose membrane, No. (%) | 5 (8) | 4 (7) | 1 (7) | 3 (11) | 0 (0) | 0.35 |
| Dialysate temperature, °C, No. (%) | 0.06 | |||||
| 35.5 | 1 (2) | 1 (2) | 0 (0) | 0 (0) | 1 (5) | |
| 36.0 | 3 (5) | 3 (5) | 0 (0) | 1 (4) | 2 (10) | |
| 36.5 | 5 (8) | 5 (8) | 0 (0) | 5 (19) | 0 (0) | |
| 37.0 | 57 (86) | 53 (86) | 15 (100) | 21 (78) | 17 (85) | |
| Dialysate potassium, mEq/L, No. (%) | 0.77 | |||||
| 1.0 | 1 (2) | 1 (2) | 0 (0) | 0 (0) | 1 (5) | |
| 2.0 | 53 (80) | 49 (79) | 11 (73) | 22 (82) | 16 (80) | |
| 3.0 | 11 (17) | 11 (18) | 4 (27) | 4 (15) | 3 (15) | |
| 4.0 | 1 (2) | 1 (2) | 0 (0) | 1 (4) | 0 (0) | |
| Dialysate calcium, mEq/L, No. (%) | <0.001 | |||||
| 1.5 and 1.6 | 13 (20) | 11 (18) | 1 (7) | 10 (37) | 0 (0) | |
| 2.0 and 2.5 | 39 (59) | 39 (63) | 7 (47) | 16 (59) | 16 (80) | |
| 3.0 and 3.5 | 14 (21) | 12 (19) | 7 (47) | 1 (4) | 4 (20) | |
| Dialysate sodium, mEq/L, No. (%) | 0.36 | |||||
| 135 | 6 (10) | 5 (9) | 1 (9) | 4 (15) | 0 (0) | |
| 138 | 6 (10) | 5 (9) | 1 (9) | 3 (11) | 1 (5) | |
| 140 | 49 (80) | 48 (83) | 9 (82) | 20 (74) | 19 (95) |
Continuous variables are presented as means ± SD or median (25th–75th percentiles). DBIC, dialysate bicarbonate; spKt/V, single-pool Kt/V; UFR, ultrafiltration rate.
a
P value from ANOVA for continuous variables, or chi-squared or Fisher exact tests for categorical variables, as appropriate.
Note: Blood flow rate is the mean of 12 time points during the baseline dialysis session.