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Table 3 Comparisons of peak strain and characteristics of strain-volume loops

From: The value of left ventricular strain–volume loops in predicting response to cardiac resynchronization therapy

Variable

Controls

(n = 20)

All Patients

(n = 40)

P

Value

Baseline

Follow-up

Baseline versus Follow-up

Responders

(n = 27)

Non-responders

(n = 13)

P

Value

Responders

(n = 27)

Non-Responders

(n = 13)

P

Value

P Value

Responders

P Value

Non-responders

Segmental peak strain

 MidLateral PSPeak

−38.6 ± 11.5

−14.7 ± 7.3

.000

−17.1 ± 7

−10.1 ± 5.7

.005

−20.8 ± 6.6

−13.2 ± 5.8

.002

.030

.239

 MidSeptal PSPeak

−51.6 ± 10.1

−12.5 ± 8

.000

−13 ± 8.8

−11.6 ± 6.5

.635

−22 ± 11

− 12.4 ± 7.8

.011

.001

.779

Characteristics of strain-volume loops

 Global PS-Global volume loop

  slope

1.08 ± 0.35

0.26 ± 0.11

.000

0.29 ± 0.11

0.21 ± 0.1

.062

0.43 ± 0.19

0.23 ± 0.1

.002

.001

.437

  R2-S/D coupling

0.99 ± 0.01

0.97 ± 0.05

.016

0.97 ± 0.05

0.96 ± 0.06

.441

0.99 ± 0.02

0.98 ± 0.02

.765

.055

.100

Segmental PS-Global volume loop

 MidLateral PS-Global volume loop

  slope

1.06 ± 0.4

0.32 ± 0.18

.000

0.38 ± 0.17

0.19 ± 0.12

.001

0.45 ± 0.22

0.23 ± 0.11

.003

.172

.235

  R2-S/D coupling

0.91 ± 0.08

0.79 ± 0.27

.019

0.84 ± 0.22

0.69 ± 0.34

.180

0.85 ± 0.15

0.83 ± 0.25

.839

.920

.262

 MidSeptal PS-Global volume loop

  slope

1.46 ± 0.57

0.19 ± 0.24

.000

0.2 ± 0.2

0.18 ± 0.3

.782

0.48 ± 0.34

0.21 ± 0.18

.004

.001

.717

  R2-S/D coupling

0.93 ± 0.04

0.54 ± 0.37

.000

0.44 ± 0.39

0.73 ± 0.26

.014

0.71 ± 0.29

0.66 ± 0.34

.680

.002

.636

Segmental PS-Segmental volume loop

 MidLateral PS-MidLateral volume loop

  slope

18.66 ± 7.41

3.85 ± 1.81

.000

4.39 ± 1.78

2.82 ± 1.44

.013

6.11 ± 2.88

3.21 ± 1.52

.000

.004

.184

  R2-S/D coupling

0.97 ± 0.04

0.93 ± 0.11

.149

0.95 ± 0.09

0.89 ± 0.15

.119

0.95 ± 0.08

0.89 ± 0.18

.194

.864

.991

 MidSeptal PS-MidSeptal volume loop

  slope

28.26 ± 10.34

6.05 ± 3.1

.000

6.67 ± 3.44

4.85 ± 1.93

.099

10.8 ± 7.22

4.83 ± 2.83

.002

.005

.987

  R2-S/D coupling

0.96 ± 0.06

0.91 ± 0.1

.052

0.89 ± 0.12

0.94 ± 0.06

.108

0.93 ± 0.13

0.81 ± 0.33

.269

.353

.215

  1. PS Principal strain
  2. Data are expressed as mean ± SD