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New system offers more accurate blood pressure measurements


February 23, 2011

CASPro is said to offer more accurate measurement of blood pressure, by determining what the pressure is at the heart, instead of in the arm (Photo: University of Leicester)

CASPro is said to offer more accurate measurement of blood pressure, by determining what the pressure is at the heart, instead of in the arm (Photo: University of Leicester)

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Traditionally, blood pressure is measured using the familiar inflatable cuff and stethoscope on the upper arm. While this method has sufficed for over a century, some people maintain that it is inaccurate – blood pressure in the arm is reportedly higher than at the heart, and not by a consistent, easily compensated-for amount. Because high blood pressure can cause the most damage at the heart and in the nearby brain, it would make sense to monitor it at the heart, too. That's just what a new device designed at the University of Leicester does ... in a roundabout way.

The Leicester device is called the CASPro, as it measures central aortic systolic pressure, or CASP. The patient wears a conventional inflatable cuff on their upper arm, that measures their blood pressure at that location, and a wireless sensor on their wrist, that measures their pulse wave. Software in the tablet-like control unit then takes that data, and uses a mathematical modeling procedure to eliminate the amplified portion of the wave, determining the true lower blood pressure at the aorta.

CASPro is said to be easier to use and more comfortable than traditional methods, although it takes a few minutes longer. Before it can come into common use, the researchers need to better define the normal values for central aortic pressures, and what they mean for clinical outcomes.

"It is not going to replace what we do overnight but it is a big advance," said Leicester's Prof. Bryan Williams. "Further work will define whether such measurements are preferred for everybody or whether there is a more defined role in selective cases to better decide who needs treatment and who doesn't and whether the treatment is working optimally."

The University of Leicester has been collaborating with Singaporean medical device company HealthSTATS International on development of the system.

The research has recently been published in the Journal of the American College of Cardiology.

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away. All articles by Ben Coxworth

I wonder if the Caspro cuff is able to accomodate pediatric and obese individuals? Or basically different size arms.


Where did the systemic and systolic figures come from? If they were found by measuring the pressures in the arms of both healthy and otherwise individuals over a long period, in a large number of samples, by means of cuffs, then the presently used methods should be perfectly adequate!

If, they were, [like the quoted figures for average safe units of alcohol per male or female per day], \'conjured up from the air\', then they don\'t mean a lot really do they?

Note: If you are taking some time to get your comment into shape.....do save it to the clipboard before hitting \'Post Comment\', [Control C], then when it disappears you can just paste it back in [Control V]. Saves a lot of re-typing and annoyance!

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