For decades, measuring blood pressure has involved the same basic process. A cuff is wrapped around the upper arm, inflated until it squeezes the artery, and then slowly released while measurements are taken.
Although this method is widely used and generally reliable, it has one major weakness: it only captures a single reading at one point in time.
Researchers now say that approach may miss much of the information doctors need. A team from the University of Utah and the University of Illinois Chicago has developed a wearable device that continuously tracks blood pressure without requiring an inflatable cuff.
Their findings were published in Nature Communications and may represent an important advance in cardiovascular monitoring.
Blood pressure is often called a silent threat because people can have dangerously high readings without experiencing obvious symptoms.
Over time, uncontrolled blood pressure can damage blood vessels and increase the risk of heart disease, stroke, aneurysms, and kidney problems. Because blood pressure changes throughout the day, doctors often encourage patients to take multiple readings rather than relying on a single measurement.
The challenge is that current monitoring systems are often bulky, uncomfortable, or inconvenient. Continuous monitoring outside hospitals has remained difficult. Researchers wanted to create a simpler solution that people could wear like an ordinary smartwatch.
The new device works differently from many consumer wearables. Some smartwatches estimate blood pressure using light sensors, but the scientific basis behind these methods is still being debated.
These systems often depend heavily on artificial intelligence models that can be difficult to interpret. Doctors may hesitate to trust results when they do not fully understand how they were produced.
The new technology takes a different approach. It sends a tiny electrical current through the wrist and measures changes in bioimpedance. Bioimpedance reflects how easily electricity moves through blood and tissues.
As blood flows through arteries with each heartbeat, these electrical properties change slightly. The device records those changes and uses them to estimate blood pressure.
What makes the system unique is its combination of artificial intelligence and physical science. Rather than allowing the computer to make unrestricted predictions, the researchers built mathematical descriptions of blood flow and electrical behavior directly into the model. This means the AI must follow established physical laws when generating blood pressure estimates.
Researchers say this approach makes the predictions more realistic and potentially more trustworthy. By incorporating fluid dynamics and electromagnetism, the system can avoid producing results that are physically impossible.
The device was tested on 150 individuals, including patients in intensive care units and outpatient clinics. This broad testing allowed researchers to examine how the technology performed in both healthy individuals and people with medical conditions.
One of the most exciting aspects of the technology is its ability to continuously record blood pressure waveforms. Standard blood pressure measurements provide only two familiar numbers: systolic pressure and diastolic pressure. These numbers are important, but they represent only a small fraction of the information available.
The new device captures a continuous record of blood pressure changes over time. Researchers compare this difference to watching an entire movie instead of looking at a single photograph. Continuous monitoring may reveal patterns that traditional measurements miss, including changes caused by exercise, stress, sleep, medication use, or daily activities.
The technology could have significant benefits for both patients and healthcare providers. Continuous monitoring may improve the detection of cardiovascular problems and help doctors personalize treatments. It could also allow people to monitor their health more comfortably at home rather than relying solely on occasional clinic visits.
The research is still at an early stage, and additional studies will be needed before the smartwatch becomes commercially available. Regulatory approval, large-scale testing, and real-world validation will all be important next steps.
Nevertheless, the study highlights how advances in engineering, mathematics, and artificial intelligence are transforming healthcare. One of its greatest strengths is the use of scientific principles to guide the AI system, making the results easier to explain and trust.
If future development is successful, cuff-free blood pressure monitoring could become a practical reality and provide a much richer understanding of cardiovascular health than current methods allow.
If you care about high blood pressure, please read studies that early time-restricted eating could help improve blood pressure, and natural coconut sugar could help reduce blood pressure and artery stiffness.
For more health information, please see recent studies about added sugar in your diet linked to higher blood pressure, and results showing vitamin D could improve blood pressure in people with diabetes.
Source: University of Utah.
