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Ambulatory blood pressure monitoring by a novel cuffless device: a pilot study
Filippo Scalise1,2, Davide Margonato2, Andrea Sole2
1European Society of Hypertension, Excellence Center, Istituto Clinico Verano Brianza, Policlinico di Monza, Monza, Italy.
Insights
Cuffless blood pressure (CL-BP) devices offer an alternative to traditional cuff-based (C-BP) monitoring. A new CL-BP device showed moderate accuracy, with improved precision in male and overweight individuals.
Area of Science:
- Biomedical Engineering
- Cardiovascular Technology
- Medical Devices
Background:
- Cuff-based blood pressure (BP) measurement is the standard but can be cumbersome for continuous monitoring.
- Cuffless blood pressure (CL-BP) devices are emerging as a potential alternative for ambulatory BP monitoring.
- Assessing the accuracy of novel CL-BP devices against established methods is crucial for clinical adoption.
Purpose of the Study:
- To evaluate the accuracy of a new cuffless blood pressure (CL-BP) device compared to a standard cuff-occlusion-based (C-BP) device.
- To assess the performance of the CL-BP device for 24-hour ambulatory blood pressure monitoring.
- To identify demographic factors influencing the accuracy of CL-BP measurements.
Main Methods:
- Eighty-four patients underwent simultaneous 24-hour BP monitoring using both a new CL-BP device and a standard oscillometric C-BP device.
- Data analysis included calculation of 24-hour mean systolic BP (SBP), diastolic BP (DBP), and heart rate (HR).
- Pearson correlation coefficients and Bland-Altman plots were used to compare measurements from both devices, with subgroup analysis based on BMI and sex.
Main Results:
- The CL-BP device yielded higher mean 24-hour SBP (131.1 ± 15.9 mmHg) and DBP (80.2 ± 9.7 mmHg) compared to the C-BP device (125.4 ± 10.9 / 75 ± 8.3 mmHg).
- Significant, moderate correlations were observed between CL-BP and C-BP measurements (SBP: r=0.58, DBP: r=0.65).
- Accuracy, indicated by higher correlation coefficients, was better in male (SBP: r=0.71, DBP: r=0.77) and overweight (BMI > 25) patients (SBP: r=0.65, DBP: r=0.70) compared to females and normal-weight individuals.
Conclusions:
- The evaluated CL-BP device demonstrated a moderate correlation with standard C-BP measurements for 24-hour ambulatory monitoring.
- The device's accuracy was found to be influenced by patient characteristics, performing better in males and individuals with a BMI greater than 25.
- Further research and device refinement are needed to enhance the accuracy and reliability of cuffless BP monitoring technologies.
Purpose:
Cuffless blood pressure (CL-BP) measurements are believed to be a potentially alternative to cuff-occlusion-based (C-BP) measurement. A new cuffless device was developed for ambulatory BP monitoring. We assessed the accuracy of a new CL-BP device compared to a standard oscillatory C-BP device over the 24 h.
Materials And Methods:
Eighty-four consecutive patients were included in the study. BP was measured simultaneously by the CL-BP device and by a C-BP device over the 24 h. Calculations included 24 h mean systolic (S) BP, the mean diastolic (D) BP and the heart rate (HR). Correlations between the CL-BP and C-BP measurements were sought using Pearson's correlation coefficients and Bland-Altman plots.
Results:
Using the C-BP device, the 24 h SBP value for the cohort was 125.4 ± 10.9 mmHg (mean ± SD); the corresponding DBP value being 75 ± 8.3 mmHg. Mean SBP/DBP were higher with the CL-BP device, i.e. 131.1 ± 15.9/80.2 ± 9.7 mmHg . The correlation coefficients between the two sets of values were significant (SBP: r = 0.58, DBP: r = 0.65). Better correlations for SBP and DBP were found 1) in patients with BMI > 25 (SBP: r = 0.65, DBP: r = 0.70) compared to those with BMI <25 and 2) in males compared to females (SBP: r = 0.71, DBP: r = 0.77).
Conclusions:
In our patients a CL-BP device estimated 24 h mean SBP and DBP differently from the classical oscillometric device, with a moderate correlation. CL-BP measurements were most accurate on male and overweight subjects.
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