Document Detail

Accuracy of oscillometric blood pressure measurement in critically ill neonates with reference to the arterial pressure wave shape.
MedLine Citation:
PMID:  8727439     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To perform further evaluation of the oscillometric device for neonatal arterial blood pressure (ABP) measurement, using a catheter-manometer system (CMS) for accurate intraarterial measurement. We aimed to describe the influence of the radial artery wave shape on oscillometric ABP determination, as pressure wave-shape influences the relationships between systolic arterial pressure (SAP), diastolic arterial pressure (DAP) and mean arterial pressure (MAP) in the wave. These relationships are part of the algorithms contributing to the final ABP determination in the oscillometric device. DESIGN: Intra-patient comparison of two blood pressure measurement systems. SETTING: Neonatal intensive care unit. PATIENTS: In 51 critically ill newborn infants, ABP was determined oscillometrically in the brachial artery and, simultaneously, invasively in the radial artery using a high-fidelity CMS. Clinical data of the infants were: gestational age: 29 (25-41) weeks; birthweight: 1200 (500-3675) g, postnatal age: 6 (2-46) h. METHODS: Statistical analysis was performed with the paired Student's t-test. Multiple regression analysis was used to determine the influence of birthweight and height of the blood pressure on the results. MEASUREMENTS AND MAIN RESULTS: In 51 infants, 255 paired values of SAP, DAP and MAP were recorded. In all recordings, we determined the relationship between SAP, DAP and MAP, using the equation: MAP = alpha%(SAP - DAP) + DAP. For SAP, DAP, MAP and alpha, we computed mean differences (bias) and the limits of agreement (precision). Biases for SAP, DAP, MAP and alpha were significantly different from zero (P < 0.001) and the limits of agreement for SAP, DAP and MAP were wide: 18.8 mmHg, 17.2 mmHg and 15.2 mmHg respectively. The relationship between invasive and noninvasive values is only partly (7-19%) influenced by the height of the blood pressure; low values of SAP, DAP and MAP tend to give overestimated oscillometric values. In the relationship between SAP, DAP and MAP, alpha was found to be 47% invasively (as generally found in the radial artery in newborns) and 34% noninvasively (as generally found in the brachial/radial artery in adults). CONCLUSIONS: Inaccuracy of the oscillometric device may be partly explained by the incorporation of an inappropriately fixed algorithm for final ABP determination in newborns. Care should be taken when interpreting the oscillometrically derived values in critically ill newborn infants.
M Gevers; H R van Genderingen; H N Lafeber; W W Hack
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Intensive care medicine     Volume:  22     ISSN:  0342-4642     ISO Abbreviation:  Intensive Care Med     Publication Date:  1996 Mar 
Date Detail:
Created Date:  1996-09-18     Completed Date:  1996-09-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7704851     Medline TA:  Intensive Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  242-8     Citation Subset:  IM    
Department of Pediatrics-neonatology, Free University Hospital, Amsterdam, The Netherlands.
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MeSH Terms
Bias (Epidemiology)
Blood Pressure Monitors / standards*
Critical Illness
Infant, Newborn
Intensive Care, Neonatal
Manometry / standards*
Oscillometry / standards*
Radial Artery*
Regression Analysis
Reproducibility of Results

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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