Something to remember at all times when it comes to medical type stuff, especially emergency medical issues. In a SHTF situation what's likely going to happen is that you'll have to rely on basic first aid type skills. There's a reason why a Paramedic must first be an EMT. EMT's learn the basic life support type stuff, like bandaging, splinting, rescue breathing stuff like that. Paramedics still do all that but we can also start IV's and give medications. However the main focus of both a Paramedic or an EMT is transporting the patient to the hospital where the patient can be treated by a Doctor in an Emergency Department (ED). That includes things like CPR and rescue breathing. Those things are just stop gap measures in the field where hopefully the underlying problem can be fixed in an ED, Cardiac Cath Lab, ICU or other specialty care center. Likewise with trauma putting pressure on a bleeding limb is only a stop gap measure, the "cure" for the problem is an Operating Room and a Surgeons scalpel along with the Surgeon fixing what ever unnatural hole is in the body that's causing the blood loss. If SHTF those services are either going to be overloaded or out of service all together. If anything is beyond your basic first aid skills to patch up, it's likely that that injured/sick person is in for a real world of hurt. Just something to be mindful of when you're thinking of medical preps.