Scientists at Boston University have developed a promising new technology that could one day allow people to measure their blood pressure using wearable devices such as smartwatches, without needing the uncomfortable squeeze of a traditional cuff.
The research focuses on a light-based method called speckle contrast optical spectroscopy, or SCOS. According to the scientists, this technology may estimate blood pressure more accurately than many current cuff-free systems being developed today.
The findings were published in the journal Biomedical Optics Express and could represent an important step toward easier and more continuous blood pressure monitoring in everyday life.
High blood pressure, also called hypertension, is one of the most common health problems in the world. In the United States alone, nearly half of adults have hypertension. The condition greatly increases the risk of heart attacks, strokes, heart failure, kidney disease, and other serious health problems.
One major challenge with hypertension is that many people do not realize they have it. High blood pressure often causes no clear symptoms, allowing damage to quietly build up over many years.
Doctors usually measure blood pressure using inflatable cuffs wrapped around the arm. While these monitors are generally accurate, they can be uncomfortable and inconvenient, especially for people who need frequent measurements.
As a result, many people only check their blood pressure during doctor appointments. However, readings taken in clinics may not always reflect what happens during normal daily life.
Some people experience what doctors call “masked hypertension.” In these cases, blood pressure appears normal at the doctor’s office but becomes dangerously high at home, during sleep, or during stressful situations. Because of this, researchers believe more continuous and convenient monitoring could help detect hidden blood pressure problems earlier.
This is where SCOS technology may become very useful.
SCOS works by shining safe, noninvasive light into the skin and measuring how the light scatters after bouncing off blood cells and surrounding tissues. The scattered light creates special patterns called speckles. By analyzing these patterns, scientists can gather information about blood flow inside the body.
Until recently, SCOS had mainly been used in brain research and studies of blood flow in tissues. Researchers at Boston University wanted to see whether the same technology could also help estimate blood pressure.
To test the idea, the team created special SCOS devices and placed them on the fingers and wrists of 30 volunteers. The devices measured blood flow and blood volume while participants rested and during leg press exercises designed to temporarily raise blood pressure.
The scientists then compared the SCOS readings with measurements from a standard continuous blood pressure monitor.
The results were highly encouraging.
By combining information about both blood flow and blood volume, SCOS estimated blood pressure up to 31% more accurately than systems that relied only on blood volume measurements.
This is important because many existing optical devices, including some smartwatch technologies, mainly use blood volume signals. These signals are commonly measured using a method called photoplethysmography, which tracks changes in blood volume beneath the skin.
SCOS provided additional advantages because it could detect very subtle and rapidly changing blood flow patterns that other methods may miss.
The researchers also designed their SCOS device using two different laser wavelengths. This allowed the system to collect information from multiple depths inside the tissue, helping create a more detailed picture of blood movement.
To interpret the large amount of information collected, the team used machine learning. Machine learning is a type of artificial intelligence that allows computers to identify patterns in data and make predictions.
Using these advanced computer models, the researchers were able to predict blood pressure with impressive accuracy. The system achieved an average error margin of only 2.26 mmHg for systolic blood pressure, which is the top number in a blood pressure reading.
This level of precision suggests the technology could potentially become useful for real-world healthcare applications in the future.
The next major goal for the research team is making the technology smaller and more practical for everyday use. Right now, the equipment is still designed mainly for laboratory testing.
Researchers hope to shrink the device so it can fit inside wearable products such as smartwatches or fitness trackers. They also want to improve how quickly the device processes information and test whether it remains accurate during daily activities such as walking, exercising, or moving around.
If successful, SCOS-based wearable devices could provide doctors and patients with much more detailed information about cardiovascular health throughout the day and night.
Continuous blood pressure monitoring could help doctors identify dangerous patterns earlier, adjust medications more precisely, and better understand how stress, sleep, exercise, and daily habits affect blood pressure.
The technology may also improve patient comfort by removing the need for repeated cuff inflation, which many people find unpleasant.
Although more testing is still needed before the technology becomes widely available, researchers believe SCOS represents an exciting step toward the future of wearable health monitoring.
For millions of people living with hypertension or at risk of developing it, the ability to track blood pressure comfortably and continuously could eventually make managing cardiovascular health much easier and more effective.
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