blood pressure monitor, health, heart rate @ Pixabay

The most common technique for estimating blood pressure is to measure the difference in systolic and diastolic pressures. Systolic pressure is the first, higher number that appears when you take someone’s pulse; diastolic is the lower second number. If your resting heart rate was 60 beats per minute and your systolic reading was 120 mm Hg, then your estimated blood pressure would be 100 mm Hg (120 minus 60). A newer technique, called oscillometry, uses an electronic cuff to measure the time it takes for your pressure to go from high (systolic) back down low again (diastolic). It also measures how quickly that happens. The faster and more often these changes occur in a heartbeat cycle, the easier it is for blood vessels and other tissues throughout your body to do their job of delivering oxygen-rich blood or nutrients wherever they are needed. That’s why doctors use this information as one indicator of health status. An even newer technique still under development is arterial tonometry–taking a noninvasive reading by measuring reflected light waves in order to estimate readings on an electrocardiogram monitor at different stages during each heart

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