Am J Perinatol 2020; 37(05): 548-552
DOI: 10.1055/s-0039-1683981
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Correlation between Invasive and Noninvasive Blood Pressure Measurements in Extremely Low Gestational Age Newborns

Krishna Kishore Umapathi
1   Department of Pediatrics, Metro Health Medical Center, Case Western Reserve University, Cleveland, Ohio
,
Maroun J. Mhanna
1   Department of Pediatrics, Metro Health Medical Center, Case Western Reserve University, Cleveland, Ohio
› Author Affiliations
Further Information

Publication History

28 June 2018

21 February 2019

Publication Date:
20 March 2019 (online)

Abstract

Objective This work aimed to study the correlation between invasive blood pressure (IBP) and non-IBP (NIBP) in extremely low gestational age newborns (ELGANs) during their first 72 hours of life.

Study Design In a retrospective cohort study, IBP and simultaneous NIBP measurements during the first 72 hours of life were recorded in ELGANs. Medical records were reviewed for potential risk factors that affect BP. The % difference in mean arterial BP (% Diff-BP) measurements was calculated as (IBP–NIBP)/IBP. Hypotension was defined as mean arterial Bp < gestational age (GA).

Results In total, 236 infants and 1,340 paired IBP–NIBP measurements were studied. Infants had a (mean ± standard deviation) GA of 25.4 ± 21.6 weeks and a birth weight of 810 ± 249 g. Overall, there was a significant correlation between IBP and NIBP of 0.887 (Spearman Rho; p < 0.001). However, the agreement between IBP and NIBP was poor, with a mean difference (95% limits of agreement) of 0.20 (–5.48; 5.89). The mean % Diff-BP (±standard deviation) was 0.39 ± 8.25%. In hypotensive infants, NIBP overestimated IBP measurements, with an agreement of –0.67 (–4.17; 2.83).

Conclusion Mean arterial NIBP correlates with IBP in ELGANs. However, there is a poor agreement between methods. In hypotensive infants, NIBP overestimates IBP measurements.

 
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