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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