Repeatability of echocardiographic parameters to evaluate the hemodynamic relevance of patent ductus arteriosus in preterm infants: a prospective observational study

Table 1 Repeatability Index (RepI), Repeatability Coefficient (RepC) and Confidence-Step-Analysis (CSA) values for Echocardiographic Parameters in Preterm Infants with Suspected Patent Ductus Arteriosus

Parameter	N	CSA	Repeatability Coefficient		Repeatability Index
Parameter	N	CSA	RepC	95 % CI	RepI [%]	95 % CI
RI_CA	23	6.5	0.09	0.07–0.13	11	9–17*
RI_ACA	23	4.1	0.11	0.08–0.16	14	11–20**
LA/Ao	23	4.9	0.23	0.17–0.33	16	12–23
LVPEP/LVET	27	3.3	0.08	0.06–0.11	23	18–32
VTI_Ao/VTI_Pa	23	8.2	0.28	0.21–0.40	26	20–38
PDA - diameter	6	7.6	0.28	0.15–1.47	21	12–112

RI (resistance index) in CA (celiac artery) and ACA (anterior cerebral artery), LA/Ao-ratio (Left-atrium-to-aortic-root-ratio), LVPEP/LVET (left-ventricular-preejection-period-to-ejection-time-ratio), VTI_Ao/VTI_Pa (ratio of the velocity time integrals in the large vessels) and PDA diameter (patent ductus arteriosus); 95 % CI (95 % confidence interval) significantly smaller than RepI of LVPEP/LVET and VTI_Ao/VTI_Pa marked with “ * ”, “significantly” smaller than RepI of VTI_Ao/VTI_Pa marked with “ ** ”

ISSN: 1471-2431