With your injuries, I doubt that you'd get the blood loss you're looking for. I had a motorcycle accident where the patient was wearing shorts and nothing else (New Hampshire does not require helmet). Road rash on 95% of his body. Massive amount of pain (lots of morphine on top of the alcohol he started with -- still screaming). Left blood smeared over most of the county, it seemed like.
Probably lost about 2 units. His system had not hit crash mode yet. Still had enough volume for his heart to work.
Basically what happens when you start losing blood is your system starts to compensate. Blood flow lessens to the skin and legs, stomach, and other less needed systems. Blood pressure would start to increase despite loss of volume. (The numbers might not change, but the heart is working harder.) Patient would probably be responsive to verbal stimuli.
Then all of a sudden the volume drops below the critical point. Blood pressure drops to something like 50/0. Patient collapses, as well as blood vessels.
My guess is to produce the results you want, a vein or two need to be cut (arteries tend to shut themselves down) or have some internal bleeding.
Basic treatment is stop leaks and refill. In the field, we'd start with at least one large bore IV and possibly two. Oxygen would also be administered in massive amounts (increase the efficiency of the blood). Hospital would start with blood transfusions.
Once the diastolic pressure hits zero, the patient is going to start seeing internal organs suffering damage. Kidneys are a big problem. My guess is a patient in that sort of situation would be in the hospital for several days.
Blood loss is classified. From Wikipedia:
- Class I Hemorrhage involves up to 15% of blood volume. There is typically no change in vital signs and fluid resuscitation is not usually necessary.
- Class II Hemorrhage involves 15-30% of total blood volume. A patient is often tachycardic (rapid heart beat) with a narrowing of the difference between the systolic and diastolic blood pressures. The body attempts to compensate with peripheral vasoconstriction. Skin may start to look pale and be cool to the touch. The patient might start acting differently. Volume resuscitation with crystalloids (Saline solution or Lactated Ringer's solution) is all that is typically required. Blood transfusion is not typically required.
- Class III Hemorrhage involves loss of 30-40% of circulating blood volume. The patient's blood pressure drops, the heart rate increases, peripheral perfusion, such as capillary refill worsens, and the mental status worsens. Fluid resuscitation with crystalloid and blood transfusion are usually necessary.
- Class IV Hemorrhage involves loss of >40% of circulating blood volume. The limit of the body's compensation is reached and aggressive resuscitation is required to prevent death.
You're talking a class III or IV loss. On average, a woman has 10 pints and a man 12 pints of blood. So for a class III loss, you're looking at 3 to 4 pints (depending upon size of patient). To see how much this is, take three pints of water. Add lots of red food coloring. Go outside and throw on ground. Bet it's a lot more than you thought it was going to be.
If you really want to make this look good, have friend lie down and then throw over them. Make sure it's red enough.
Best of luck,
Jim Clark-Dawe
Former EMT/Captain volunteer Fire Department