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Table 1 Baseline characteristics of the SQTI and normal QT groups

From: Long-term prognosis of short QT interval in Korean patients: a multicenter retrospective cohort study

 

SQTI group (n = 34)

Normal QT group (n = 136)

P

Demographics

 Age (year)

23.5 (21.0–30.5)

23.5 (21.0–31.0)

 > 0.999

 Male

31 (91.2)

124 (91.2)

 > 0.999

 Family history of SCA

1 (2.9)

0 (0.0)

0.200

 Height (cm)

173.0 (170.0–176.8)

173.0 (168.0–177.0)

0.698

 Weight (kg)

66.2 (61.1–72.0)

69.5 (60.0–78.8)

0.155

 Systolic BP (mmHg)

124.0 (113.3–129.0)

122.0 (113.3–134.0)

0.537

 Diastolic BP (mmHg)

71.0 (66.0–78.0)

76.0 (67.3–83.0)

0.056

 ICD implantation

1 (2.9)

0 (0.0)

0.200

Medications

 Digoxin

2 (5.9)

1 (0.7)

0.041

 β-blocker

3 (8.8)

7 (5.1)

0.415

 Calcium channel blocker

5 (14.7)

7 (5.1)

0.052

 RASi

3 (8.8)

6 (4.4)

0.304

 Antiarrhythmic drug

2 (5.9)

2 (1.5)

0.129

Amiodarone

1 (2.9)

1 (0.7)

 

Flecainide

1 (2.9)

1 (0.7)

 

 Diuretics

3 (8.8)

7 (5.1)

0.415

 Lipid lowering agent

1 (2.9)

2 (1.5)

0.560

 Antiplatelet

1 (2.9)

3 (2.2)

0.800

 Anticoagulant

1 (2.9)

5 (3.7)

0.835

Symptoms

 Loss of consciousness

3 (8.8)

4 (2.9)

0.144

 Palpitations

4 (11.8)

3 (2.2)

0.030

 Chest pain

3 (8.8)

8 (5.9)

0.461

ECG characteristics

 Heart rate (/min)

52.0 (47.0–58.0)

70.0 (62.3–84.0)

 < 0.001

 PR interval (ms)

160.0 (146.0–175.5)

152.0 (137.5–168.0)

0.061

 QT interval (ms)

361.0 (335.0–375.5)

380.0 (358.0–400.0)

0.001

 QTc (ms)

334.0 (330.3–337.0)

416.0 (396.3–436.8)

 < 0.001

 QT dispersion (ms)

44.0 (28.0–73.0)

20.0 (12.0–35.0)

 < 0.001

 JT interval (ms)

262.0 (245.0–279.0)

200.0 (169.0–224.0)

 < 0.001

 U wave

4 (11.8)

0 (0)

a

 Biphasic T wave

1 (2.9)

0 (0)

a

 Early repolarization

25 (73.5)

14 (10.3)

 < 0.001

 Tall T waves

20 (58.8)

10 (7.4)

 < 0.001

 PVC

2 (5.8)

2 (1.5)

0.179

 SVT

2 (5.8)

2 (1.5)

0.179

Follow-up period (year)

4.9 (2.0–7.8)

3.8 (3.8–4.2)

0.318

  1. The results are presented as median (interquartile range) for continuous data and as frequency (percentage) for categorical data
  2. BP blood pressure, ICD implantable cardioverter-defibrillator, RASi renin angiotensin system inhibitor, PVC premature ventricular contraction, SQTI short QT interval, SVT supraventricular tachycardia
  3. aStatistical comparison could not be performed because the number of patients was small