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Granted, dead is dead, but hitherto the suggestion (my impression) has been that inability to take up enough oxygen was the cause of death. Clotting is a different kettle altogether and it turns out people are being put on anti clotting agents which bring their own complications. Clots are potentially very sinister entities indeed, killing or very seriously maiming with very little warning. Anyone who doesn't want to know what is going on need not take any interest in anything whatever.