Table 4.

Correlation coefficients (r) between serum free concentration of PBUTs and parameters of cardiac function, structure, and exercise capacity.

Study Parameters	IXS	PCS	PCG	IAA	HA
CPOmax	−0.48 **	−0.51 **	−0.52 **	−0.40 **	−0.29 *
Peak Qt	−0.41 **	−0.44 **	−0.45 **	−0.33 *	−0.40 **
Peak MAP		−0.29 *	−0.29 *
Peak HR			−0.41 **	−0.31 *
VO2max	−0.41 **	−0.48 **	−0.42 **	−0.41 **	−0.38 **
Peak C(a-v)O2		−0.332 *		−0.31 *
LVMI
IVSd	0.33 *	0.32 *

Heat map showing negative correlations in and positive correlations in . Blank spaces represent no significant correlation. ** p < 0.01 and * p < 0.05 on Pearson correlation. Log-transformed values of serum concentrations of uremic toxins were used for analysis. CPO_max: peak cardiac power; peak Q_t: peak cardiac output; MAP: mean arterial pressure; peak HR: peak heart rate; VO_2max: aerobic exercise capacity; C(a-v)O₂: arteriovenous O₂ difference; LVMI: left ventricular mass index; IVSd: interventricular septal thickness at end diastole. Indoxyl sulfate (IXS), p-cresyl sulfate (PCS), p-cresyl glucuronide (PCG), indole acetic acid (IAA), and hippuric acid (HA).