The study's overarching aim is to determine whether Enzymatically Augmented Subcutaneous Infusion (EASI) can assist in out-of-hospital situations characterized by mismatch between need for, and ability to achieve, access to the vascular compartment. One mechanism for providing access to the vascular compartment, subcutaneous infusion, is facilitated by administration of hyaluronidase; the hyaluronidase hydrolyzes hyaluronan the major subcutaneous diffusion barrier. Hyaluronidase thus increases local dispersion and absorption of subcutaneously administered drugs and fluids.