Table 4.

Echocardiography speckle tracking imaging (X ± SD).

Indices	Groups	Before	3 months		6 months
GLS	Treatment	−21.58 ± 1.21	−20.91 ± 2.44	0.22	−19.95 ± 1.16	≤0.001
	Placebo	−21.77 ± 1.35	−20.61 ± 2.03	0.003	−19.06 ± 1.64	≤0.001
	P-value	0.613	0.638		0.03

The values in the fifth column mean differences between 3 months after first chemotherapy and before chemotherapy; the values in the seventh column mean differences between 6 months after first chemotherapy and before chemotherapy.