Stiff little arteries?
By Barry Fox How can you find out if someone has hardened arteries without cutting them open? Micro Medical of Rochester, Kent (GB 2356251) says you push a special thimble over a patient’s fingertip, and an LED on one side shines infrared light through the flesh to a sensor. Pressure waves in the blood caused by the heartbeat show up as small changes in the amount of infrared you can detect. The peaks come in pairs, a strong peak directly from the heart and a second,