How your heart works: two pumps, one spark, and what a heart attack really is
How a blood pressure cuff measures your blood pressure
Every classic blood pressure reading starts with a tight squeeze on your arm and a few seconds of listening. The trick is more than 100 years old. What is the doctor listening for?
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At that same check-up, the doctor also measures the blood pressure of Miva's uncle the classic way: a cuff, a gauge and a stethoscope.
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Hales needed a glass tube inside an artery. This doctor needs only a cuff and his ears.
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