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Table 2 Baseline characteristics according to QRS pattern

From: QRS pattern and improvement in right and left ventricular function after cardiac resynchronization therapy: a radionuclide study

 

LBBB

(n= 32)

RBBB

(n= 4)

Non-specific IVCD

(n= 20)

Age (years)

66 ± 11

65 ± 9

67 ± 10

Males

21 (66%)

2 (50%)

19 (95%)*

Aetiology of heart failure

   

   Ischaemic

9 (28%)

3 (75%)

10 (50%)

   Non-ischaemic

23 (72%)

1 (25%)

10 (50%)

NYHA class

   

   III

28 (88%)

4 (100%)

17 (85%)

   IV

4 (12%)

0 (0%)

3 (15%)

QRS duration (ms)

160 (140-180)

140 (125-170)

120 (120-130)§

QRS ≥ 150 ms

22 (69%)

1 (25%)

4 (20%)†

LEFT axis

15 (47%)

3 (75%)

10 (50%)

LVEF (%)

23 ± 6

25 ± 6

21 ± 7

RVEF (%)

37 ± 11

38 ± 9

34 ± 8

  1. *p = 0.018 vs LBBB; §p < 0.001 vs LBBB; †p = 0.001 vs LBBB
  2. LBBB, left bundle branch block; RBBB, right bundle branch block; IVCD, intraventricular conduction disturbance; NYHA class, New York Heart Association class; LVEF, left ventricular ejection fraction; RVEF, right ventricular ejection fraction