All, without exception, are equipped with special monitors cuff, worn on the hand. Outer layer made of nylon or another synthetic material and is equipped with a locking mechanism in the form of "Velcro" or snaps. The inner side of the cuff is made of medical rubber.
Filled with or emptied of air under pressure, a sleeve presses down on the surface of the hands, blocking blood flow through the arteries. At the initial stage, when the pressure in the cuff exceeds the pressure of the blood in the vessels, blood flow is temporarily stopped by him. In the process of bleeding air from the cuff comes a time when the pressure in it is compared with the systolic arterial blood pressure, a stethoscope or automatic blood pressure monitor detects the appearance of noise called Korotkoff tones.
Venting air from the cuff continues and the time when these noises disappear, attests to the equality of air pressure in the cuff and diastolic blood pressure in a blood vessel.
Being the ancestor of all modern monitors, however, widely used and currently. Consists of air blower, shoulder cuff, gauge and stethoscope. The air in the cuff is performed mechanically, using a rubber pear.
His undeniable advantages – low price and reliability. In the course of using the sphygmomanometer, the measurement result depends on the correct location of the artery of the diaphragm of the stethoscope.
As for the measurement of blood pressure in most cases requires the assistance of a person having professional skills with a stethoscope, the most popular device received from the doctors and medical staff.
Automatic blood pressure monitor
This device is the most easy to use among all devices for measuring pressure. Consists of a cuff and an electronic unit. To use the instrument enough to put the cuff on the arm and turn on the tonometer. The compressor inside the appliance yourself will bring the pressure in the cuff to the desired level, and then start to reduce gradually. Electronics blood pressure monitor at this time will capture all the information about the parameters of the pulse wave coming from sensitive sensors located inside the cuff. Upon completion of the cuff deflated, and the device display will show information about systolic, diastolic pressure and pulse rate.
For persons suffering from tachycardia, it makes sense to opt for the device, equipped with the technology of MOM, in which are performed 3 consecutive measurements and average the result.
It is useful in the presence of tonometer functions PAD that detects arrhythmia and displaying on the display a special icon. In this case, the blood pressure measurement should be repeated.
It is recommended to stop the choice on the tonometer with a mixed power supply system, allowing the unit to operate from batteries, and the adapter connected to AC power.
Semi-automatic blood pressure monitor
In fact, this device – analogue automatic tonometer with the only difference that the air in the cuff is pumped into it not the compressor, but manually, using a supercharger in the form of a pear. Due to more simple construction such a device is usually longer than its automatic counterpart and has a lower power consumption, which positively affects the service life of the batteries or accumulators from which it is powered.
Having the same set of diagnostic tools and additional features, semi-automatic devices have a lower cost than automatic blood pressure monitors, and therefore are accessible to a wide audience of users, the bulk of whom are of retirement age and older people.
Making a choice between monitors with shoulder and hand cuffs you should know that with age the elasticity of blood vessels decreases, therefore the pulse wave signal, which the sensors are automatic and semi-automatic devices capable of capturing, significantly weakens. Because of this, the accuracy of the measurements will be insufficient so that the use of the tonometer will be simply useless.
For this reason, we strongly recommend you to choose heart rate monitors equipped with shoulder cuff, and the models with hand cuffs to leave for sportsmen and persons under the age of 40 years.
Standard heart rate monitors are equipped with cuffs size medium length coverage from 22 to 32 cm if necessary, you can replace cuffs small size with coverage from 15 to 22 cm or large size, having a length of 32 to 42 cm have you selected a tonometer will be accurate, reliable and durable!
Be always healthy!