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Table 3 Demographic information, electrocardiographic, echocardiographic and SAECG data of both groups

From: Evaluation of the efficacy of signal-averaged electrocardiogram testing in the cardiac assessment of beta-thalassemia major patients

Variable

Myocardial Iron overload

P-value

Hepatic iron overload

P-value

Normal

Moderate

Severe

Normal

Moderate

Severe

Demographic information

Age

29.96 ± 7.237

30.67 ± 7.763

30.71 ± 7.448

0.942

28.40 ± 8.249

30.94 ± 8.321

30.70 ± 5.695

0.648

Height

160.20 ± 13.769

162.83 ± 6.524

160.59 ± 14.366

0.910

158.70 ± 19.431

159.33 ± 10.353

162.85 ± 11.948

0.627

weight

55.08 ± 7.842

53.92 ± 7.579

57.82 ± 13.357

0.608

56.00 ± 8.718

54.36 ± 10.863

57.25 ± 10.135

0.683

Age at time of first transfusion

16.72 ± 18.17

20.50 ± 12.06

13.18 ± 13.85

0.726

9.40 ± 6.240

16.17 ± 13.461

16.60 ± 20.613

0.473

Transfusion interval

16.96 ± 3.23

16.50 ± 2.81

17.76 ± 4.52

0.698

18.80 ± 3.938

16.56 ± 2.684

16.95 ± 4.110

0.276

Total number of transfused packed cells

1065.44 ± 384.08

981.67 ± 342.28

1127.88 ± 342.18

0.685

943.00 ± 431.514

1045.56 ± 323.070

1172.50 ± 345.772

0.236

Ferritin

3319.12 ± 4387.17

2618.33 ± 1820.74

5548.05 ± 4033.46

0.155

817.81 ± 560.19

3315.88 ± 3350.92

6257.05 ± 4572.86

0.001

TTE

LVEDD

45.23 ± 8.25

46.00 ± 5.76

47.81 ± 6.54

0.546

47.55 ± 8.706

44.45 ± 5.130

47.20 ± 8.377

0.433

LVESD

25.87 ± 5.07

26.50 ± 5.28

28.58 ± 7.58

0.371

25.43 ± 2.565

25.09 ± 4.371

29.30 ± 7.861

0.070

LVEF

59.44 ± 3.52

59.33 ± 2.65

54.29 ± 10.07

0.045

60.50 ± 3.873

58.25 ± 3.735

55.48 ± 9.468

0.151

12-lead surface ECG

P-wave duration

97.36 ± 24.544

108.00 ± 32.069

116.24 ± 41.799

0.189

105.90 ± 32.429

104.06 ± 32.039

106.30 ± 35.718

0.978

QRS duration

106.04 ± 55.142

91.00 ± 16.162

122.59 ± 53.446

0.381

107.30 ± 63.034

99.67 ± 21.920

120.70 ± 63.670

0.457

T-wave duration

266.76 ± 33.784

300.50 ± 51.244

282.88 ± 25.085

0.065

271.10 ± 30.853

281.39 ± 34.326

275.25 ± 38.224

0.742

P-Q interval

151.84 ± 28.461

181.50 ± 37.612

167.06 ± 46.741

0.159

161.60 ± 38.679

153.94 ± 28.532

166.90 ± 44.612

0.580

QTc

428.44 ± 24.947

443.67 ± 27.790

491.94 ± 59.883

 < 0.001

424.70 ± 20.602

447.39 ± 44.423

471.80 ± 58.283

0.040

SAECG

Average beat

470.80 ± 65.267

420.00 ± 44.077

481.76 ± 90.714

0.215

433.00 ± 60.606

475.67 ± 55.225

479.40 ± 91.779

0.243

Filter QRS duration

103.48 ± 30.834

100.00 ± 18.783

117.41 ± 48.961

0.431

109.90 ± 25.243

115.11 ± 41.730

100.60 ± 38.359

0.490

LAS-40

38.28 ± 29.724

53.00 ± 66.630

56.53 ± 41.924

0.326

47.00 ± 26.285

56.39 ± 52.381

37.55 ± 31.582

0.357

RMS-40

49.96 ± 44.588

42.33 ± 24.809

32.94 ± 63.327

0.567

47.50 ± 61.031

32.94 ± 29.769

49.75 ± 59.103

0.567

HF noise

0.706 ± 1.0692

0.414 ± 0.1475

1.289 ± 0.8760

0.289

0.491 ± 0.4596

0.938 ± 1.3227

1.0131 ± 1.7437

0.619