Table 2.

Reference ranges for tissue Doppler deformation parameters in the neonatal population

Values presented as means and standard deviations if available. All values are obtained from the basal segments in the four-chamber view. All strain units are %, strain rate 1/s

Gest gestation, N number of infants, Wt birthweight, Wks weeks, LV left ventricle, RV right ventricle, PMA post-menstrual age, S strain, SRs systolic strain rate, SRe early diastolic strain rate, SRa late diastolic strain rate (during atrial contraction)