A Comparison of Proximal Tibia and Proximal Humerus Infusion Rates of Plasma Under High Pressure Using the EZ IO Intraosseous Device in the Adult Swine (Sus scrofa) Hypovolemic Model

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Abstract:

Purpose Evaluate use of plasma admin via IO under pressure 300mmHg in proximal humerus and tibia, establish which IO sites reach higher flow rate, and eval for pulmonary fat emboli-FE post IO infusion. Method2 groups of swine-16 each intubated and ventilated. Central venous and arterial lines placed blood removed at rate of 2.15mlmin for 7min, then 1.15mlmin for 13min. Swine observed with no treatment for 1hr. EZIO needle inserted plasma reinfused for 10min. Lung samples eval for signs of FE. Findings The mean weight, vol removed and infusion pressure were similar in both groups. Mean vol plasma infused 490mL tibia and 649mL humerus. Mean infusion rate was 49mLminSD22mLmin tibia and 78mLminSD43mLmin humerus p0.02. Survival rate 94 tibia, 88 humerus p0.33. Humerus serum lactate elevated during 1hr post bleed decreased post plasma infusion tibia elevated until EOS. Histo revealed FE present 88 tibia, 94 humerus. ConclusionIO infusion rate of plasma in humerus greater than tibia in swine model. Majority of swine had FE in lungs. Further studies needed to eval safety of high pressure infusion in IO device.

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