All of the diseases mentioned (diabetes, high cholesterol, high blood pressure, and sleep apnea) are chronic conditions, and ideal candidates for the "gather a

All of the diseases mentioned (diabetes, high cholesterol, high blood pressure, and sleep apnea) are chronic conditions, and ideal candidates for the "gather a bunch of data over a large time window and see what we can see" approach. A heart attack is a very acute condition, and doesn't give you the same luxury of looking at things over time. You have to get it right, and you only have one shot at it. When looking at chronic conditions you can built up a confidence over time, and only raise the alert when you're very sure. With a heart attack, you have a window of minutes, to an hour or two. False positives are much more of a risk in that case, and the cost of false positives is magnified significantly when a screening tool is widespread. I may be mistaken, but you seem to be extrapolating my comment to mean that I don't think we will see continued expansion of screening tools built into various wearables. That's not true at all. I think it's quite obvious that this is an area where we will see significant growth over the coming decade. That doesn't change my stance that heart attacks are categorically different, and much harder to detect from a sensor isolated on the wrist. I think the most promising path to doing that is detecting elevated troponin levels in the blood, and while there is some work being done on accomplishing that noninvasively, it's still a long way from being readily available.