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Table 1 The main clinical features of the index patients and their relatives

From: DSP p.(Thr2104Glnfs*12) variant presents variably with early onset severe arrhythmias and left ventricular cardiomyopathy

Family

Age (M/F)

Genotype, * = TTN+

Conduction defect

Arrhythmias

PM, ICD

LVEDD (mm)

EF (%)

proBNP (ng/l), ** = BNP

Age at dg

Phenotype

Other

Family 1

 II.2

68 M

−/−

AVB1

no

no

53

76

22

  

 II.4

65 M

−/−*

pLBBB

VT, VESm/R, AF

ICD

68

33

2059

58

DCM

 

II.5

51 M

+/− *

LAHB

no

no

80

10–15

2135**

51

DCM

Heart transplant

 II.9

63 M

−/−

no

no

no

47

65

13

  

 III.1

41 M

−/−

no

no

no

48

57

16

  

 III.3

31 M

−/−

no

no

no

58

67

109

  

 III.7

44 M

−/−*

LAHB

no

no

55

14

NA

44

DCM

 

Family 2

II.2

67F

+/−

LAHB, RBBB

AF

no

68

30

650

46

DCM

SCD

 II.4

66F

+/−

AVB1, LAHB

no

no

55

45

1742

60

DCM

 

 III.2

49F

+/−

no

no

no

49

50–56

43

  

 III.3

47 M

−/−

no

no

no

59

57

30

  

 III.4

46 M

−/−

no

no

no

54

64

55

  

 III.5

42 M

−/−

no

bradycardia

no

56

55

56

  

 III.6

40 M

+/−

no

no

no

52

54–55

79

  

 IV.1

26 M

−/−

pRBBB

no

no

49

54–59

20

  

Family 3

II.1

81 M

+/−

AVB1, LBBB

VTm, AF

no

83

18–24

23,478

72

DCM

 

 III.1

56 M

+/−

no

no

no

60

52

265

Slightly dilated ventricle (Henry’s formula: 118.8%)

 III.2

53 M

+/−

no

no

no

54

56–58

13

  

 III.3

49F

−/−

no

no

no

48

63

24

  

Family 5

II.3

54F

+/−

AVB1, LAHB

VTm, VESp

no

60

30–35

1400

43

DCM

 

 III.1

21F

−/−

no

bradycardia

no

50

60

71

  

Family 6

II.1

59 M

+/−

AVB3

VT, AF

PM

83

19

9836

48

DCM

Heart transplant

Family 7

II.2

70F

+/−

AVB2, LAHB

VESp, AF

CRT-D

60

15–20

2428

50

DCM

 

 II.4

62F

−/−

no

no

no

47

72

48

  

 II.5

57 M

+/−

no

VES

no

67

32

455

NA

DCM

 

 III.1

50F

−/−

no

no

no

46

65

123

  

 III.3

47 M

−/−

NA

NA

no

NA

NA

NA

  

Family 8

 

48F

+/−

AVB1

VT

PM

70

22

3117

42

DCM

 

Family 9

 

27F

+/−

no

VES

no

60

40

400

22

DCM

 

Family 10

 II.1

M

+/−

no

VES

no

54

52

21

  

III.1

14 M

+/−

no

VF

no

55

17

NA

14

DCM

SCD

Family 11

 

43 M

+/−

AVB2

no

no

52

52

20**

  
  1. Index patients are marked in bold. Symbols and abbreviations: Age (M/F) age and gender (M: male, F: female); genotype +/− heterozygous for the DSP p.(Thr2104Glnfs*12), −/− wild type allele, * TTN p.(Val33411Thrfs*32); NA not available; AVB1–3 atrioventricular blocks type 1–3, (p)L/RBBB (partial)left/right bundle branch block; LAHB left anterior hemiblock; Arrhythmias - VT for ventricular tachycardia: VT means VT episode without information on QRS-axis or morphology, VTm monomorphic VT and VTp polymorphic VT; VES for ventricular extrasystoles: VES, when no information on VES morphology is available, VESm/R means that most of the VES were monomorphic with RV origin (LBBB-morphology) and VESp when most of the VES were polymorphic; AF for atrial fibrillation; VF for ventricular fibrillation; PM pacemaker; ICD implantable cardioverter-defibrillator; CRT-D cardiac resynchronization therapy device; LVEDD left ventricular end-diastolic diameter (mm); LVEF left ventricular ejection fraction (%); ProBNP pro b-type natriuretic peptide, ** BNP b-type natriuretic peptide; Age at dg - age at diagnosis of cardiomyopathy; Phenotype - phenotype at diagnosis; DCM dilated cardiomyopathy; Other – other significant clinical features; SCD sudden cardiac death