Table 5.

Ventricular deformation in uncomplicated preterm infants by age beyond the first week .

Age (weeks)	Infants* (n)	RV FWLS (%)	RV FWLSRs (1/sec)	LV GLS (%)	LV GLSRs (1/sec)	IVS GLS (%)	IVS GLSRs (1/sec)
4 – 6	40	−21.0 ± 2.5	−2.3 ± 0.4	−19.7 ± 2.3	−1.9 ± 0.3	−17.9 ± 2.3	−1.8 ± 0.4
6 – 8	57	−23.2 ± 2.8	−2.6 ± 0.5	−20.4 ± 2.4	−1.9 ± 0.2	−18.9 ± 2.0	−2.1 ± 0.3
9 – 11	18	−22.7 ± 2.2	−2.7 ± 0.5	−20.0 ± 2.3	−1.8 ± 0.2	−19.1 ± 1.5	−2.4 ± 0.3
60 – 79	26	−27.5 ± 2.4	−2.9 ± 0.5	−21.4 ± 2.0	−1.9 ± 0.2	−21.4 ± 3.0	−2.5 ± 0.4
80 – 99	4	−28.7 ± 2.5	−3.5 ± 0.4	−21.1 ± 1.6	−1.7 ± 0.3	−22.1 ± 2.3	−2.6 ± 0.6

Data are presented as mean ± SD.

^*Uncomplicated, defined as infants without bronchopulmonary dysplasia, echocardiographic signs of pulmonary hypertension at 32 or 36 weeks. There were 48 uncomplicated preterm infants at 32 weeks PMA, 67 uncomplicated preterm infants at 36 weeks

PMA, and 30 uncomplicated preterm infants at one year CA. PMA, and/or a hemodynamically significant patent ductus arteriosus at Day 5–7 or any size PDA at 32 or 36 weeks PMA.

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