=I don't know if it's been confirmed but I think that it is safe to assume that the deathquotes from the chapter headings are spoken by patients who had their blood drained in Taravangian's hospital. If the deathquotes in the Prologue-Chapter 3 were spoken in the last 10 heartbeats then the heart rate of those people would have been ~19.4bpm, 60bpm, 120bpm, and 20bpm. As others have mentioned your pulse increases when you lose a lot of blood, I think that given these heart rates it is highly unlikely that they could have been given in the last 10 heartbeats of someone who was bleeding out.