But it turns out that I am a general practitioner, and that it has been almost thirty years since I use blood pressure monitors dozens of times each day. We are very far here from the good old sphygmomanometer (cuff that inflates with small hand pump with a needle dial ...) with the monitor listening for the brachial artery (neck), but the principle remains the same: a small pump, electrical this time, a cushion that inflates thereby tightens the wrist slightly, and a sensor (acoustic or pressure?) that measure the flow of blood through the radial artery and the brachial not . It does not change, in theory, not much to the measured pressures.
I compared with fifteen volunteers with taking traditional measure, using both methods in succession on the same arm / wrist, the traditional method (manual) first or second chance. Whenever I found a difference generally pretty minimal (sometimes quite large at first, it was enough to start the two measures move closer to see, probably eliminating the emotional factor). We can therefore deduce that the measure is probably pretty reliable.
I also compared with other electronic sphygmomanometer, cuff one, and, curiously, the differences were much larger, not the pressure of numbers (or voltage), but the heart rate measurement. So unreliable that point of view, the measure to the former (the pulse with a watch over 30 seconds or 1 minute) being the reference.
I finally used the device in two patients with true full arrhythmia (atrial fibrillation by for connoisseurs, and anticoagulants) and knew the power numbers seemed correct to me (which is harder to see when the rhythm is not regular, even in the ear), the unit did not detect the arrhythmia as yet it is supposed to.
Okay, now, the interest of the thing, I really doubt if your blood pressure is too high at the start, and requires treatment, this type of device is useless compared to medical follow you need (medical, NOT to the chemist where TA is almost never taken in good conditions). And if your blood pressure is usually normal, it is no use at all. As a bonus, if your blood pressure is doubtful ie between the two, you'll get it up every time you take the unit by the stress of the measure.
So rather just pretend device for blood pressure, unreliable for heart rhythm without true medical interest. No doubt a proper construction, but I find, super expensive. Especially for the interest it has ...
