Blood pressure measurement using only a smartphone.

Area of Science:

• Biomedical Engineering
• Cardiovascular Health
• Digital Health

Background:

• Hypertension is a global public health challenge and a leading cause of premature death.
• Current methods for hypertension detection, diagnosis, and monitoring have significant limitations.
• Smartphone-based blood pressure measurement offers a potential solution for large-scale ambulatory monitoring.

Purpose of the Study:

• To review and analyze existing literature on blood pressure measurement using only smartphone sensors.
• To evaluate the methodologies, signal processing techniques, feature extraction, and algorithms used in smartphone-based blood pressure estimation.
• To assess the validation methods and effectiveness of these emerging technologies.

Main Methods:

• A literature search was conducted for studies on smartphone-only blood pressure measurement from November 2011 to November 2021.
• 25 relevant articles were included and analyzed for data recording methods, signal processing, feature extraction, and algorithms.
• Approaches were categorized into contact (23 articles) and contactless (2 articles) methods, with sample sizes and inclusion of hypertensive subjects noted.

Main Results:

• Most reviewed approaches require direct sensor contact; two utilize contactless facial video analysis.
• Sample sizes varied widely (3-3000 subjects), with 10 studies including hypertensive participants.
• Significant inconsistencies were found in data collection, reference measurement, and validation methodologies, with no established protocol for smartphone-based devices.

Conclusions:

• Smartphone-based blood pressure measurement holds potential for overcoming limitations of current methods.
• Standardized validation protocols are critically needed for accuracy and reliability.
• Future research should focus on developing and validating consistent methodologies for widespread adoption in hypertension management.