Table 4.

Average fluid content, fluid ratios, brain natriuretic peptide, troponin, postdialysis recovery time, and change in standing heart rate

VariableStart of Run-In PeriodEnd of Run-In PeriodP ValueBiofeedback PeriodControl PeriodP Value
Extracellular water, L16.7 (15.0 to 18.3)16.7 (14.9 to 18.5)0.9917.0 (15.2 to 18.7)17.3 (15.5 to 19.2)0.80
Intracellular water, L19.4 (17.6 to 21.1)19.4 (17.5 to 21.3)0.9919.1 (17.4 to 20.8)20.5 (18.6 to 22.4)0.29
Total body water, L35.0 (33.1 to 39.0)36.1 (32.7 to 39.4)0.7036.1 (33.1 to 39.1)37.8 (34.5 to 41.1)0.45
Extracellular water–to–intracellular water ratio0.86 (0.78 to 0.94)0.86 (0.79 to 0.94)0.990.91 (0.82 to 0.99)0.86 (0.78 to 0.94)0.39
Extracellular water–to–total body water ratio0.46 (0.44 to 0.48)0.46 (0.44 to 0.48)0.990.47 (0.45 to 0.49)0.46 (0.44 to 0.48)0.49
Hydration, %25.1 (18.4 to 31.9)25.2 (19.0 to 31.5)0.9827.0 (20.1 to 34.0)23.5 (16.9 to 30.0)0.47
B-type natriuretic peptide, ng/L5916 (2941 to 8891)6441 (4803 to 10,081)0.837793 (2803 to 12,783)6333 (2210 to 10,455)0.66
High-sensitivity cardiac troponin, ng/L84 (63 to 105)74 (57 to 91)0.4773 (55 to 91)70 (46 to 93)0.85
Kt/V1.25 (1.15 to 1.35)1.30 (1.21 to 1.39)0.471.30 (1.21 to 1.38)1.27 (1.21 to 1.33)0.56
Recovery time, h8.27 (4.89 to 11.66)9.31 (5.80 to 12.83)0.689.07 (4.26 to 13.88)8.65 (4.23 to 13.08)0.91
Change in standing heart rate (post−pre)−1.93 (−5.15 to 1.28)−0.79 (−3.77 to 2.19)0.51−1.71 (−5.09 to 1.67)−1.14 (−5.33 to 3.04)0.84
  • Values are expressed as mean (95% confidence interval) unless otherwise indicated. Post−pre, post-hemodialysis heart rate minus pre-hemodialysis heart rate.