Blood Pressure Monitor Parameters
Blood pressure is an important health parameter, monitored by a device called a blood pressure monitor. Driven by an electronic pulse, a pressure cuff around the upper arm expands, exerting pressure and a reading can be measured on a display. A healthy blood pressure for an adult would usually read 120/80mmHg. Monitors vary in their features and parameters, something to be aware of when selecting a device.
Performance
The performance of a blood pressure monitor is often measured in terms of accuracy and precision. Accuracy is the degree to which the device is able to measure the correct value, and precision reflects its ability to replicate that value on multiple measurements. A performance indicator to look out for is the device’s A/D Resolution, usually expressed as the number of bits. The higher the bits, the better the resolution.
Accuracy Standard
Most blood pressure monitors will be validated to follow an accuracy standard, such as the International Protocol or the British Hypertension Society. Manufacturers may also self-certify using in-house testing. When considering a device, look for standards-based validation to ensure accurate readings.
Cuff size
The measurement of blood pressure requires the pressure cuff to fit correctly, especially the upper arm size. Smaller upper arms should be fitted with a cuff measuring between 9.4-14.2 cm for an optimal fit. It is important to select a monitor with a range of cuff sizes, so that it is suitable for a variety of users.
Memory Capacity
Most blood pressure monitors include a memory capacity, allowing the device to store multiple readings or health data. Some devices only store one reading, while others can save multiple readings over an extended period of time, making the monitoring of trends easier.
Extras
For certain users, such as the elderly or those with hypertension, special features may be beneficial when selecting a blood pressure monitor. Some of these features may include: late-model devices able to connect to Smartphones via Bluetooth; color screens with access to historical data; a Color Blood Pressure Mode to quickly check for warning signs; plus a Heart Rate Measurement for comparison.
In summary, when you choose a blood pressure monitor, be aware of the essential parameters and features such as performance, accuracy standards, cuff size, memory capacity, and a range of extras. While a basic model can provide basic readings, for those who suffer from hypertension or have special requirements, more sophisticated monitors that offer features such as heart rate measurement, color screens and Bluetooth connectivity can be beneficial.
