Skip to main content

Table 1 Response rates by various EKG and CMR criteria.

From: Presence of a CMR-based U-shaped contraction pattern and optimal LV pacing lead position determines best response to CRT

Criteria

Marker (n)

Response Rate

(↓ESV ≥ 15%)

Significance

 

All patients (27)

52%

--

EKG

Typical LBBB (15)

60%

p = 0.45

 

All others (12)

42%

 
 

QRS ≥ 150 ms (17)

47%

p = 0.69

 

QRS < 150 ms (10)

60%

 
 

Typical LBBB and QRS ≥ 150 ms (9)

56%

p = 1.00

 

All others (18)

50%

 

CMR

Type I pattern (11)

36%

p = 0.25

 

Type II pattern (16)

63%

 
 

Lead concordant (18)

67%

p < 0.05

 

Lead remote (9)

22%

 
 

Type II pattern and lead concordant (10)

90%

p < 0.005

 

All others (17)

29%

 
  1. EKG = electrocardiogram; CMR = cardiovascular magnetic resonance; LBBB = left bundle branch block; QRS = QRS complex duration