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Table 4 Layer-specific global left ventricular strain analysis (n = 20)

From: Ventricular strain analysis in patients with no structural heart disease using a vendor-independent speckle-tracking software

Variable

Full-thickness

Endocardial-only

Epicardial-only

P Value

Intra-class correlation coefficient (95% confidence interval)

Longitudinal

 S (%)

−19.2 ± 2.2

− 19.1 ± 2.1

−16.5 ± 1.6a

< 0.001

0.97 (0.71–0.94)

 SRs (1/s)

−1.0 ± 0.1

−1.1 ± 0.1

−0.9 ± 0.1a

< 0.001

0.97 (0.76–0.95)

 SRe (1/s)

1.1 ± 0.3

1.1 ± 0.3

0.9 ± 0.2a

< 0.001

0.97 (0.85–0.97)

 S-TP (ms)

380.1 ± 42.6

381.8 ± 43.4

373.5 ± 41.5

0.22

0.97 (0.84–0.99)

 SRs-TP (ms)

197.5 ± 29.3

201.4 ± 32.6

194.7 ± 32.0

0.59

0.91 (0.83–0.96)

 SRe-TP (ms)

499.4 ± 46.6

500.2 ± 45.5

496.9 ± 47.7

0.86

0.98 (0.96–0.99)

Circumferential

 S (%)

−23.6 ± 3.9

−23.7 ± 3.9

− 16.7 ± 4.2a

< 0.001

0.96 (0.50–0.89)

 SRs (1/s)

− 1.5 ± 0.3

− 1.5 ± 0.3

− 1.1 ± 0.3a

< 0.001

0.96 (0.71–0.94)

 SRe (1/s)

1.5 ± 0.3

1.4 ± 0.3

1.0 ± 0.3a

< 0.001

0.94 (0.49–0.89)

 S-TP (ms)

367.3 ± 40.4

365.8 ± 41.6

381.5 ± 44.5

0.44

0.71 (0.43–0.87)

 SRs-TP (ms)

223.4 ± 32.2

220.6 ± 32.4

219.7 ± 43.3

0.97

0.74 (0.52–0.89)

 SRe-TP (ms)

486.2 ± 41.1

483.0 ± 40.0

497.3 ± 55.0

0.57

0.73 (0.48–0.88)

Radial

 S (%)

39.8 ± 10.8

50.9 ± 22.9b

33.9 ± 11.1c

< 0.001

0.69 (0.18–0.82)

 SRs (1/s)

1.8 ± 0.5

2.2 ± 0.7b

1.9 ± 0.7

0.02

0.71 (0.40–0.90)

 SRe (1/s)

−1.7 ± 0.7

− 2.4 ± 1.5b

−1.6 ± 0.8

0.01

0.60 (0.08–0.80)

 S-TP (ms)

382.6 ± 46.9

414.0 ± 70.6

408.7 ± 58.5

0.18

0.66 (0.30–0.84)

 SRs-TP (ms)

212.1 ± 53.0

201.4 ± 62.7

202.3 ± 47.0

0.85

0.52 (0.19–0.82)

 SRe-TP (ms)

501.1 ± 47.6

491.3 ± 54.7

510.8 ± 58.1

0.34

0.81 (0.63–0.92)

  1. Abbreviations: S Systolic strain, SRe Early diastolic strain rate, S-TP Time-to-peak strain, SRe-TP Time-to-peak early diastolic strain rate, SRs Systolic strain rate, SRs-TP Time-to-peak systolic strain rate
  2. Continuous data are expressed as mean ± standard deviation
  3. aP < 0.001 when compared with full-thickness and endocardial-only groups
  4. bP < 0.05 when compared with full-thickness group
  5. cP < 0.01 when compared with full-thickness and endocardial-only groups