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Mean arterial pressure differences between cuff oscillometric and invasive blood pressure
Dean S Picone1,2, Martin G Schultz3, Matthew K Armstrong4
1School of Health Sciences, Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia. Dean.Picone@sydney.edu.au.
Summary
Automated blood pressure (BP) devices may have errors in systolic and diastolic BP estimations due to inaccuracies in mean arterial pressure (MAP) measurements. Understanding these differences is crucial for accurate BP monitoring.
Area of Science:
- Cardiovascular Physiology
- Medical Device Technology
- Clinical Measurement
Background:
- Automated cuff oscillometric blood pressure (BP) devices are widely used, but discrepancies with invasive measurements persist.
- The accuracy of mean arterial pressure (MAP) derived from automated devices is a critical factor potentially influencing systolic (SBP) and diastolic (DBP) BP estimations.
- The precise relationship between automated MAP errors and subsequent SBP/DBP estimation errors has not been fully elucidated.
Purpose of the Study:
- To determine if inaccuracies in automated cuff oscillometric mean arterial pressure (MAP) measurements contribute to errors in automated cuff systolic (SBP) and diastolic (DBP) blood pressure (BP) estimations.
- To quantify the association between differences in MAP (cuff-invasive) and differences in SBP and DBP (cuff-invasive) across multiple automated BP devices.
Main Methods:
- Analysis of data from five studies involving 262 patients undergoing coronary angiography.
- Simultaneous measurement of cuff oscillometric MAP using five different automated BP devices and invasive MAP via catheters.
- Calculation of differences (∆) between cuff oscillometric and invasive MAP, SBP, and DBP to assess device accuracy.
Main Results:
- Significant associations were found between ∆MAP and ∆SBP in four out of five devices, with ∆MAP explaining 6-52% of the variance in ∆SBP.
- Significant associations were also observed between ∆MAP and ∆DBP in the same four devices, with ∆MAP explaining 35-52% of the variance in ∆DBP.
- These findings indicate that inaccuracies in automated MAP measurements are linked to errors in automated SBP and DBP estimations.
Conclusions:
- Differences between automated cuff oscillometric MAP and invasive MAP are associated with errors in automated SBP and DBP.
- Further research is needed to enhance the accuracy of automated cuff BP devices.
- Increased transparency regarding the algorithms used in automated BP devices is necessary for a better understanding of measurement discrepancies.
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