Hopefully systems can evolve in the future so that I can sleep soundly knowing that should I have a cardiac arrest during the night, I will not have my information included in a research project without my prior consent.
Really? It isn't the prospect of the possible death or brain damage from cardiac arrest that stops you from sleeping soundly but the personal data implications?
(You mean "OMG what if Tesco somehow got hold of this information about my cardiac arrest and used it to sell me aspirin" kind of thing?)
There are some kinds of study where the data would be affected by the seeking of consent. If you want a quantitative study on survival outcomes in cardiac arrest patients, then allowing the surviving patients the right to withdraw consent for their data to be included (but not the ended-up-dead patients, because their rights are not being infringed, since they're dead, obvs) - then clearly this will skew the data and render it pointless for predicting clinical outcomes.
Allowing the NoK of a dead person the right to withdraw data retrospectively for the dead patients is a bit nonsensical - and in fact against patient autonomy (do you want your relatives to be able to interfere with your patient data choices after death?)
Sometimes clinical research isn't compatible with current notions of consent - and "consent" in any case is a shifting idea, very historically specific, and can be a bit of a useful fiction as an idea. Not that it isn't a good thing, but it certainly isn't a fixed or immutable thing, or something that you have an inalienable right to, either legally or morally.
And in the end, really, you think issues of consent should always override essential research into saving lives, even if the information can't be obtained any other way?
What about other kinds of medical situation? Suppose we had an outbreak of Ebola here and some patients refused to "consent" to treatment? Would you be averse to them being rounded up by the military and put under forced quarantine, or would their right to "consent" trump everyone else's wellbeing? Just wondering....