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Updated: May 25, 2026
09:56
Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
Published on: February 14, 2021
Factors influencing differences between invasive and spontaneous baroreflex estimates: distinct methods or different
Sónia Gouveia1, Ana Paula Rocha, Philippe van de Borne
1Centro de Matemática da Universidade do Porto and Departamento de Matemática, Universidade de Aveiro, Portugal. sonia.gouveia@fc.up.pt
Summary
Baroreflex sensitivity (BRS) estimates from spontaneous data using the baroreflex events (BEs) method show higher correlation with sigmoidal models compared to baroreflex sequences (BSs). This suggests BEs better reflect BRS physiology across conditions.
Area of Science:
- Physiology
- Cardiovascular Research
- Biomedical Engineering
Background:
- Baroreflex sensitivity (BRS) is crucial for cardiovascular regulation.
- Current BRS estimation methods differ between invasive (drug-induced) and spontaneous conditions, leading to discrepancies.
- Existing spontaneous BRS estimators, like baroreflex sequences (BSs), may not fully capture physiological dynamics.
Purpose of the Study:
- To compare BRS estimates obtained using different methods and under varying conditions.
- To evaluate the performance of the baroreflex events (BEs) technique for spontaneous BRS estimation.
- To investigate the correlation and differences between invasive and spontaneous BRS estimates.
Main Methods:
- Comparison of BRS estimates derived from invasive (drug-induced) and spontaneous data.
- Utilized sigmoidal and non-sigmoidal estimators, including baroreflex events (BEs) and baroreflex sequences (BSs).
- Analyzed correlations and differences in BRS estimates across different conditions and methods, relating them to blood pressure (SBP) and respiratory rate (RR) levels.
Main Results:
- All BRS estimates demonstrated significant correlations.
- BE estimates from spontaneous data showed higher correlation with sigmoidal estimates than BS estimates.
- Differences in BRS estimates were linked to SBP level variations between invasive and spontaneous conditions.
- The BE estimator reduced discrepancies between BRS estimates across conditions, correlating with SBP and RR level changes.
- Sigmoidal estimates correlated better with BE estimates (invasive) than with BS estimates.
Conclusions:
- BRS analysis using the BEs method provides estimates with higher correlation and lower variability across different conditions.
- The BEs method offers a more robust and physiologically representative measure of BRS compared to BSs.
- BEs improve the consistency of BRS estimation, bridging the gap between invasive and spontaneous measurements.
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