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Table 3 Peak systolic radial normal strain, time to peak systolic radial normal strain and shear strain of LVPW, IVS in parasternal short axis views (mean ± SD)

From: Normal and shear strains of the left ventricle in healthy human subjects measured by two-dimensional speckle tracking echocardiography

Variance

Wall

Base

Mid

Apex

Normal peak systolic radial strain

IVS

0.37 ± 0.11*

0.32 ± 0.15**

0.25 ± 0.11

LVPW

0.59 ± 0.18

0.51 ± 0.16

0.35 ± 0.14***

P

<0.00001

<0.00001

<0.01

Time to peak systolic radial strain (ms)

IVS

341 ± 35*

343 ± 23*

361 ± 35

LVPW

413 ± 43* &

384 ± 37

385 ± 47

P

<0.00001

<0.00001

<0.01

Shear strain (degree)

IVS

−2.1 ± 9.1

0.0 ± 6.2

2.5 ± 8.6

LVPW

−1.0 ± 9.4

−0.1 ± 9.0

1.3 ± 8.8

P

ns

ns

ns

  1. Notes: *Compared to the apex of the same wall, P < 0.05; **Compared to the apex of the same wall, P < 0.01; ***Compared to the apex of the same wall, P < 0.0001; &Compared to the mid of the same wall, P < 0.01. LVPW, Left ventricular posterior wall; IVS, Interventricular septum; LV, Left ventricle.