> maybe advancement in imaging and detection could have spotted It's possible that I have hidden Long QT syndrome [0]. Mine can be detected following drug prov

> maybe advancement in imaging and detection could have spotted It's possible that I have hidden Long QT syndrome [0]. Mine can be detected following drug provocation using adrenaline but under normal conditions it doesn't show on my ECG. It is undetectable on MRI or angiograms because it is electrochemical rather than mechanical in nature. There are emerging genetic tests that can pick up some of the possible congenital causes. > If you were unconscious and wearing a watch with ECG features Current watches with ECG features don't detect my Right Bundle Branch Block [1], let alone the hidden Long QT. [Edit] > and given you an Implantable defibrillator They are quite expensive to implant prophylactically, create a small risk of infection in the heart itself and require explanting every few years for a battery change. I had one implanted after the event. [0] https://en.wikipedia.org/wiki/Long_QT_syndrome https://en.wikipedia.org/wiki/Long_QT_syndrome [1] https://en.wikipedia.org/wiki/Right_bundle_branch_block https://en.wikipedia.org/wiki/Right_bundle_branch_block