Correlation between iron stores and QTc dispersion in chronic ambulatory peritoneal dialysis patients

Figures & data

Table 1. Demographic and laboratory data of peritoneal dialysis and control subjects.

	PD patients (n = 58)	Controls (n = 19)	p
Age (years)	42.1 ± 13.6	42.4 ± 14.0	NS
Weight (kg)	69.2 ± 13.4	70.3 ± 13.9	NS
Blood urea nitrogen (mg/dL)	140.6 ± 50.2	22.4 ± 12.4	<0.0001
Serum creatinine (mg/dL)	7.4 ± 4.2	0.8 ± 0.3	<0.0001
Sodium (mEq/L)	137.8 ± 3.3	138.1 ± 3.1	NS
Potassium (mEq/L)	4.3 ± 0.6	4.4 ± 0.6	NS
Calcium (mg/dL)	8.8 ± 1.2	9.2 ± 1.1	NS
Phosphate (mg/dL)	5.3 ± 1.8	5.0 ± 1.9	NS
Magnesium (mg/dL)	1.0 ± 0.5	1.4 ± 0.3	NS
Smoker n (%)	12 (20.6)	4 (21.0)	NS
QT interval (s)	0.43 ± 0.34	0.34 ± 0.28	0.007
QTc (s)	0.46 ± 0.36	0.38 ± 0.27	NS
QT dispersion (s)	0.51 ± 0.23	0.48 ± 0.20	NS
QTc dispersion (s)	0.62 ± 0.29	0.55 ± 0.26	NS

Figure 1. Correlation between QTc dispersion and ferritin levels in CAPD patients.

Figure 2. Correlation between QTc dispersion and TSAT levels in CAPD patients.

Figure 3. Boxplot showed that CAPD patients who have QTcD > 65 msn, have higher ferritin levels.

Table 2. Correlation between QTc dispersion and clinical and laboratory data in PD patients.

	QTc dispersion (ms)
	r	p
Duration of peritoneal dialysis (months)	−0.040	0.785
Hemoglobin (mg/dL)	−0.117	0.383
Albumin (mg/dL)	−0.052	0.708
Sodium (mEq/L)	0.054	0.692
Potassium (mEq/L)	0.102	0.452
Magnesium (mg/dL)	0.144	0.313
Phosphate (mg/dL)	−0.062	0.664
Iron (μg/dL)	−0.113	0.395
Transferrin saturation (%)	0.512	0.002
Ferritin (ng/mL)	0.469	0.003
TSH (µIU/mL)	−0.062	0.650