How does a blood pressure monitor work?

Vibrating sphygmomanometers have been in the spotlight in recent years as walk-in sphygmomanometers in hospitals and home sphygmomanometers in private homes. This device measures the oscillations of the arterial walls due to blood flowing through the arteries between systolic and diastolic blood pressure.

The received electrical signal is shown on the digital display.

Systolic blood pressure is a measure of the pressure in the blood vessels during the heartbeat. Blood pressure measured when the heart is at rest is called diastolic blood pressure. The new device measures how much dilation is needed to reach a level of 20 mmHg above systolic blood pressure.

When this pressure is reached, blood flow stops, and the cuff contracts under systolic pressure, allowing blood to flow again, and causing the arterial walls to vibrate. Under the relaxation pressure, the patient continues the normal blood flow.

At any time, the vibration of the arterial wall can be large enough to push the blood by pushing the blood at any time. Digital devices fade at a rate of about 4 mmHg per second. They appear to run slower than non-digital devices, but some are more accurate.

What is high blood pressure?

High blood pressure affects approximately 43 to 56 million adults and is a major health problem in some developing countries. This happens when blood flows through a vein that is at a higher than normal pressure. The pressure that the blood exerts on the walls of the arteries as the heart pumps blood is called blood pressure. Too much of this force leads to high blood pressure.

Blood pressure monitoring is important for some patients because this condition contributes to serious cardiovascular disease. For most people, a home blood pressure monitor is the easiest way to monitor changes in blood pressure. Therefore, this monitor must be accurate. However, the accuracy of home blood pressure monitors varies and may be affected by the specific monitor and method of use.

Are blood pressure monitors accurate?

The common monitoring of the BP of the house is the uncertainty regarding the accuracy of the data. The calculation accuracy of the HBP monitor is modified. Blood pressure accuracy may vary depending on the user of the device or the device itself.

Studies have shown that most of these home sphygmomanometers have a 5 mmHg difference from mercury sphygmomanometers. These differences can be dangerous for some patients who need constant blood pressure measurements depending on their condition. Therefore, it is recommended that you reevaluate your home blood pressure monitor. Previous work by Khan et al. and Merrick et al. reported similar results. Merrick et al. In 1997, 34% of patients reported inaccurate blood pressure readings when using a home blood pressure monitor. Campbell et al. 35% of home blood pressure monitors noted that they were not accurate at a threshold of 4 mmHg.

The Association for the Advancement of Medical Instruments (AAMI), the British Hypertension Society (BHS), and the European Society of Hypertension have protocols for the prior authorization of commercial blood pressure monitoring devices. Re-evaluation of blood pressure measuring devices on the market is difficult because it is expensive and time-consuming.

However, studies on the accuracy of ambulatory sphygmomanometers have also been conducted. Goodwin J. A 2007 study of 114 patients compared two different ambulatory vibrometer blood pressure monitors for accuracy. Both devices reported high accuracy. The precision of this Ronald MD device. 1991. E.G. Additional studies were conducted to assess the difference in accuracy between home blood pressure measurements and ambulatory blood pressure measurements. One study reported the concordance of ABP and ABP values ​​for the diagnosis of hypertension. In addition, the home sphygmomanometer has greater sensitivity and specificity for the diagnosis of hypertension than the outpatient sphygmomanometer.

Use in the real world

In addition to considering how blood pressure monitors will perform under ideal conditions (such as those used by trained professionals or used in clinical trials), these devices should be tested under real-world conditions to determine their accuracy. There are prohibited methods for accurate blood pressure assessment that should be used in health care facilities and at home.

Using consistent conditions minimizes the risk of error when comparing blood pressure over time. For example, the patient must sit quietly for 5 minutes with feet on the floor, and legs crossed before blood pressure is measured. Blood pressure should also be checked in both arms. Patients may not be aware that these conditions are critical to the accuracy of the results.

The healthcare provider should also remind the patient that it is inappropriate to ask questions during the assessment and allow the patient to rest for a few minutes before taking the measurement.