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Cuffless blood-pressure estimation method using a heart-rate variability-derived parameter.

Yang Chen1,2, Shuo Shi3,2, Ying-Ke Liu1

  • 1Department of Electronic and Information Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, People's Republic of China.

Physiological Measurement
|August 9, 2018
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Summary
This summary is machine-generated.

This study introduces a new cuffless blood pressure estimation method incorporating sympathetic tone, improving accuracy for hypertensive patients. The novel approach enhances non-invasive monitoring capabilities by integrating heart rate variability and pulse transit time.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Medical Devices

Background:

  • Cuffless blood pressure (BP) monitoring offers potential for continuous, non-invasive BP assessment.
  • Current cuffless methods face accuracy challenges, particularly in hypertensive individuals.
  • Sympathetic tone variations are observed in hypertension, suggesting its relevance for BP estimation.

Purpose of the Study:

  • To develop and validate a novel cuffless BP estimation method.
  • To enhance BP estimation accuracy by incorporating sympathetic tone indicators.
  • To evaluate the method's performance in both hypertensive and normotensive subjects.

Main Methods:

  • Investigated heart-rate variability (HRV) and proposed the heart-rate power spectrum ratio (HPSR) as a sympathetic regulation indicator.
  • Developed a BP estimation model integrating HPSR, pulse transit time (PTT), and photoplethysmography intensity ratio.
  • Validated the model against standard sphygmomanometry in 60 participants (29 hypertensive, 31 normotensive).

Main Results:

  • Hypertensive patients exhibited a significant increase in HPSR compared to normotensive subjects.
  • Achieved estimation accuracy of ±10.04 mmHg for SBP and ±7.10 mmHg for DBP in hypertensive patients.
  • The proposed method outperformed traditional PTT-based algorithms, reducing standard deviation error by 3 mmHg in hypertensive patients.

Conclusions:

  • Integrating autonomic activity factors, such as sympathetic tone, improves cuffless BP estimation accuracy.
  • The novel method shows promise for more reliable non-invasive BP monitoring, especially in hypertensive populations.
  • This approach advances the development of practical clinical tools for long-term hypertension management.