Table 1.

Baseline (first calendar quarter) data of 56,984 MHD patients (July 2001 to June 2004) according to the prescribed dialysate (bath) K concentrationa

ParameterDialysate (Bath) K Concentration (mEq/L)
≤1.0b2.0b,c3.0b,d>3.0
No. of MHD patients (%)8572 (15)35,757 (63)11,921 (21)734 (1)
Age (yr)58 ± 1661 ± 1564 ± 1565 ± 15
Gender (% women)45464853
Diabetes (%)46474946
Race/ethnicity (%)
    white37384751
    black21352931
    Hispanic2414139
Time on dialysis (%)
    3 to 6 mo16303230
    6 to 24 mo19201211
    2 to 5 yr27231515
    >5 yr37274244
Medicare as primary insurance (%)64676263
Known causes of death (% of all-cause)
    cardiovascular56524752
    infectiouse12131311
Standardized mortality ratio0.78 ± 0.270.82 ± 0.280.79 ± 0.250.81 ± 0.27
BMI (kg/m2)26.0 ± 6.026.5 ± 6.226.6 ± 6.226.0 ± 6.4
Kt/V (single pool)1.5 ± 0.31.5 ± 0.31.6 ± 0.31.6 ± 0.4
nPCR or nPNA (g/kg per d)1.1 ± 0.31.0 ± 0.20.9 ± 0.30.9 ± 0.3
Serum potassium (mEq/L)5.3 ± 0.64.9 ± 0.64.5 ± 0.64.3 ± 0.6
Serum albumin (g/dl)3.83 ± 0.373.76 ± 0.403.63 ± 0.493.55 ± 0.54
    creatinine (mg/dl)10.1 ± 3.29.1 ± 3.37.2 ± 2.96.4 ± 3.0
    ferritin (ng/ml)597 (321)506 (301)366 (249)358 (265)
    TIBC (mg/dl)201 ± 41202 ± 42206 ± 48204 ± 49
    bicarbonate (mg/dl)21.6 ± 2.921.9 ± 2.822.2 ± 3.022.4 ± 3.5
    phosphorus (mg/dl)6.2 ± 1.75.7 ± 1.55.3 ± 1.45.1 ± 1.4
    calcium (mg/dl)9.2 ± 0.89.3 ± 0.79.2 ± 0.79.1 ± 0.8
Blood hemoglobin (g/dl)11.9 ± 1.212.0 ± 1.312.1 ± 1.312.1 ± 1.4
    WBC count (×103/μl)7.4 ± 2.37.3 ± 2.37.5 ± 2.57.5 ± 2.3
Lymphocyte (% of total WBC count)20 ± 821 ± 821 ± 820 ± 8
  • a Count data are percentages, and continuous values are means ± SD if normally distributed or median (interquartile range) if skewed. P < 0.001 for the difference among the four groups, unless otherwise specified. BMI, body mass index; K, potassium; MHD, maintenance hemodialysis; nPCR, normalized protein catabolic rate; nPNA, normalized protein nitrogen appearance; TIBC, total iron-binding capacity; WBC, white blood cell.

  • b The dominating K bath type in each group.

  • c Also includes 1.1 to 1.9.

  • d Also includes 2.1 to 2.9.

  • e P = 0.4.