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Table 4 Three-layer longitudinal strain at the basal, mid-ventricular, and apical levels of the left ventricle in pregnancy

From: Quantitative evaluation of longitudinal strain in layer-specific myocardium during normal pregnancy in China

 

Controls

Trimester 1

Trimester 2

Trimester 3

Postpartum

 

(13.6 ± 2.2)wk

(24.8 ± 4.4)wk

(38.1 ± 2.6)wk

(7.4 ± 2.4) wk

Basal level (%)

 Endocardial layer (%)

18.62 ± 4.01

19.01 ± 5.67

18.91 ± 4.67

16.77 ± 4.91*

18.91 ± 4.33

 Mid-myocardial layer (%)

19.09 ± 4.61

18.65 ± 4.27

18.59 ± 4.67

16.08 ± 4.57*

18.79 ± 5.07

 Epicardial layer (%)

17.88 ± 3.72

18.01 ± 4.70

17.65 ± 4.70

15.51 ± 4.36*

17.78 ± 4.22

P -value (between layers)

. > 0.05

>0.05

<0.05

< 0.05

> 0.05

Mid-ventricular level (%)

 Endocardial layer (%)

23.31 ± 5.16

22.95 ± 4.53

22.64 ± 4.11

19.98 ± 3.31*

23.02 ± 5.26

 Mid-myocardial layer (%)

20.92 ± 5.22

20.72 ± 4.31

20.57 ± 4.29

18.18 ± 3.80*

21.07 ± 4.92

 Epicardial layer (%)

17.88 ± 3.72

18.01 ± 4.70

17.65 ± 4.70

15.51 ± 4.36*

17.78 ± 4.22

P-value (between layers)

< 0.01

< 0.01

< 0.001

< 0.001

< 0.01

Apical level (%)

 Endocardial layer (%)

30.77 ± 6.23

30.19 ± 5.65

30.36 ± 7.44

27.47 ± 6.97*

29.96 ± 5.44

 Mid-myocardial layer (%)

24.63 ± 6.05

23.83 ± 5.19

24.03 ± 6.06

20.77 ± 5.47*

24.21 ± 6.46

 Epicardial layer (%)

19.03 ± 4.77

20.03 ± 5.65

19.35 ± 5.30

17.01 ± 4.79*

19.92 ± 4.82

P-value (between layers)

< 0.001

< 0.001

< 0.001

< 0.001

< 0.001

  1. Data are given as mean ± SD in absolute values; *P < 0.05 vs. Controls; P < 0.05 vs. Trimester 1; P < 0.05 vs. Trimester 3