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Am J Perinatol 2021; 38(12): 1259-1262
DOI: 10.1055/s-0040-1710030
Original Article

Consistency between Impedance Technique and Echocardiogram Hemodynamic Measurements in Neonates

Wenshen Wu
1   Neonatal Department, Dongguan Children's Hospital, Guangdong Medical University, China
,
Sulian Lin
2   Ultrasound Department, Dongguan Children's Hospital, Guangdong Medical University, China
,
Caixuan Xie
1   Neonatal Department, Dongguan Children's Hospital, Guangdong Medical University, China
,
Jianbo Li
1   Neonatal Department, Dongguan Children's Hospital, Guangdong Medical University, China
,
Jingen Lie
1   Neonatal Department, Dongguan Children's Hospital, Guangdong Medical University, China
,
Shuyi Qiu
3   School of Public Health, Guangdong Medical University, China
› Author Affiliations Funding The research was supported by Dongguan Science and Technology Planning Project (grant number: 2018507150281400), Guangdong Province, China.
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Abstract

Objective The aim of this study was to validate impedance technique (IT) by investigating the agreement in cardiac output measurements performed by IT and echocardiography (ECHO).

Study design This is a prospective observational study, including a total of 30 neonates who underwent hemodynamic measurements by IT and ECHO. To determine the agreement between both methods, we performed IT to measure stroke volume (SV-IT) and cardiac output (CO-IT) immediately before or after ECHO to measure SV (SV-ECHO) and CO (CO-ECHO). The precision and accuracy of the IT relative to ECHO were assessed.

Results SV-ECHO and SV-IT were (4.45 ± 0.78) and (4.54 ± 0.81) mL, respectively. The bias and limits of agreement of SV-IT were 0.09 mL and ( –1.92 to 1.73) mL, respectively. The true precision of SV-IT was 27.3%. Furthermore, CO-ECHO and CO-IT were (0.62 ± 0.12) and (0.61 ± 0.12) L/min, respectively. The bias and LoA of CO-IT were 0.01L/min and (–0.33 to 0.31) L/min, respectively. The true precision of CO-IT was 28.3%.

Conclusion Agreement between the IT and ECHO in the cardiac output measurement appeared acceptable. However, the accuracy and precision of the IT approach should be further investigated using a larger sample.

Keywords

impedance technique - echocardiogram - cardiac output - Bland–Altman analysis


Publication History

Received: 22 October 2019

Accepted: 19 March 2020

Article published online:
25 April 2020

© 2020. Thieme. All rights reserved.

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