A person comes into your ER room with a very weak pulse after a suffering a heart attack. You suspect:
D:  A very weak pulse shows that the heart is slowly ceasing to function as a result of pumping too hard.
A: The patient should not be sent home; close observation is necessary.
B: This stage is a life-threatening stage as the heart could tire itself out and stop functioning.
C: An early stage of shock shows a rapid, bounding pulse.
The weak pulse has nothing to do with shock or the heart attack, so send him home.
A late stage (decompensated) shock, the least life-threatening stage of shock.
A very early stage (compensated) shock, the most life-threatening stage of shock.
A late stage (decompensated) shock, the most life-threatening stage of shock