I have hypertension which has been treated for years with medication. My measured pressure is now within healthy limits. I have a cuff-based device bought from

I have hypertension which has been treated for years with medication. My measured pressure is now within healthy limits. I have a cuff-based device bought from a UK chemist and I check it most days, at a similar time and after at least ten minutes sitting down (as per jawngee elsewhere on this thread). Even so my BP and pulse vary by a few percent. When I go into a hospital / surgery I get my BP checked properly and because the result is usually in the same ball park as the home device, I tend to trust that if the home device showed a sudden massive variation, then I should consider consulting a doctor. If smartphones are doing a variation check, as the article implies, then they could be useful. But there is no substitute for a proper check using a calibrated device if you are really worried. One reason that I check my BP is that I have underlying issues with my heart's electrical systems: right bundle branch block [0]. This is visible on a professional ECG. I've had quiet a few of those following a ventricular fibrillation episode which involved an air ambulance ride to a cardiac ICU where I had a defibrillator implanted. These underlying conditions are not typically detected on the few (n == 1) smart devices I've tried that offer an ECG-lite check. [0] https://en.wikipedia.org/wiki/Right_bundle_branch_block https://en.wikipedia.org/wiki/Right_bundle_branch_block