Dying
If your Hit Points reach 0, you are dying. You immediately fall unconscious and can take no actions.
While dying, you lose 1 Resolve Point each round at the end of your turn. (If your Hit Points reached 0 during your turn, such as from an attack of opportunity you provoked, you do not lose a Resolve Point until the end of your next turn.) This continues until either you die or stabilize (see Stabilizing below).
Source
Core Rulebook pg. 250