The automatic devices work on the same principle as the method developed by Riva-Rocci, yet, in contrast to the auscultation technique, they usually do not record the resultant sounds, but rather the vibrations or oscillations of the vascular wall. As with the auscultatory method, blood flow through the artery only returns when the cuff pressure falls below systolic blood pressure level. These vibrations are detected by the sensors in the arm cuff. If the cuff pressure, in turn, falls below the diastolic pressure, they come to a virtual standstill.
An oscillogram is generated based on the changing oscillation amplitude between systolic and diastolic blood pressure. Since it is easier to detect the oscillation maximum than it is to start and stop it, the MAP constitutes the most reliable figure for automatic blood pressure measurement. Using appropriate algorithms, systolic and diastolic blood pressure can also be calculated using the oscillogram and the MAP. However, there is still no uniform formula for performing this calculation.
Consequently, differences in measurement between individual devices and manufacturers are possible. Regardless of whether they are performed digitally or in the old fashioned way, blood pressure checks are an important aspect of routine healthcare practices. American Heart Association Monitoring your blood pressure at home.
Your browser's JavaScript functionality is turned off. Please enable JavaScript for full functionality of this site. Enter your keyword. Back How to monitor your blood pressure Updated: January Do-it-yourself testing There are two circumstances in which you might test your blood pressure at home: because your doctor has asked you to, or because you want to keep an eye on it yourself.
How does a blood pressure monitor work? How to take blood pressure readings? There are several things to remember: Relax. Steer clear of caffeine and exercise for thirty minutes beforehand, and rest for a few minutes. Sit comfortably upright with your feet flat on the floor and with your back supported. Ask your doctor if this is an option for you. It's a good idea to keep a blood pressure log at home and have your doctor check your monitor once a year to make sure you are getting accurate readings.
A blood pressure test is simple, quick and usually painless. However, the blood pressure cuff squeezes your arm while it inflates. Some people find this slightly uncomfortable. The feeling lasts for only a few seconds. No special preparations are usually needed for a blood pressure test. But the following steps may help your doctor get the most accurate measurement:. Usually, a nurse or technician takes your blood pressure while you are seated in a chair with your feet flat on the floor.
The blood pressure cuff is wrapped around the top part of your arm. The bottom of the cuff is just above your elbow. It's important that the cuff fits. Readings can vary if the cuff is too big or too small. Some blood pressure cuffs automatically inflate and measure your pulse. In this case, a stethoscope is not needed. If your blood pressure is high or low, you'll need to have at least three more blood pressure tests, spaced at least a week apart, to determine if you need treatment.
Blood pressure can vary from moment to moment and day to day. Your doctor, nurse or technician can tell you your blood pressure results immediately after the test. Blood pressure is measured in millimeters of mercury mm Hg. A blood pressure measurement has two numbers:. Here's a look at blood pressure categories and what they mean. If your top and bottom numbers fall into two different ranges, your correct blood pressure category is the higher one.
If lifestyle changes do not successfully manage your blood pressure, your doctor may recommend medication. If you have low blood pressure, your symptoms will depend on the cause.
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