Table 4.

Ventricular deformation in healthy uncomplicated preterm infants by weight

Weight (Kilograms)	Infants * (n)	RV FWLS (%)	RV FWLSRs (1/sec)	LV GLS (%)	LV GLSRs (1/sec)	IVS GLS (%)	IVS GLSRs (1/sec)
0.5 – 0.9	66	−18.8 ± 4.7	−2.0 ± 0.6	−19.1 ± 2.0	−1.8 ± 0.1	−17.7 ± 2.1	−1.7 ± 0.2
1.0 – 1.4	82	−20.7 ± 0.3	−2.5 ± 0.4	−19.4 ± 2.1	−1.9 ± 0.2	−18.0 ± 2.5	−1.9 ± 0.4
1.5 – 1.9	62	−21.5 ± 0.8	−2.8 ± 0.3	−20.2 ± 0.5	−1.9 ± 0.3	−18.4 ± 0.3	−2.3 ± 0.3
2.0 – 2.4	50	−23.3 ± 3.3	−2.8 ± 0.4	−20.6 ± 0.6	−1.8 ± 0.4	−19.4 ± 1.2	−2.2 ± 0.4
2.5 – 2.9	21	−24.0 ± 3.6	−3.1 ± 0.5	−20.4 ± 0.6	−1.9 ± 0.5	−19.3 ± 1.6	−2.4 ± 0.5
8.0 –9.0	16	−27.3 ± 2.3	−3.2 ± 0.3	−21.1 ± 0.4	−1.7 ± 0.6	−21.7 ± 0.5	−2.6 ± 0.3
10.0 –12.0	14	−27.7 ± 2.3	−3.5 ± 0.7	−20.1 ± 0.4	−1.9 ± 0.7	−22.9 ± 1.3	−2.6 ± 0.7

Data are presented as mean ± SD.

^*Healthy uncomplicated cohort, defined as preterm infants without bronchopulmonary dysplasia, echocardiographic signs of pulmonary hypertension at 32 or 36 weeks PMA, and/or a hemodynamically significant patent ductus arteriosus at Day 5–7 or any size PDA at 32 or 36 weeks PMA. At Day 1 there were n=65, Day 2, n=65, Day 5–7, n=36, 32 weeks PMA, n=48, 36 weeks PMA, n=67, and One year CA, n=30.

RV, right ventricle; LV, left ventricle; IVS, interventricular septum

FWLS, free wall longitudinal strain; FWLSRs, free wall longitudinal systolic strain rate

GLS, global longitudinal strain; GLSRs, global systolic longitudinal strain rate